How can I make this transition smooth instead of it jumping up










3















I am trying to implement a notification system in my app without the use of a library. Here is a gif of the issue: https://imgur.com/oRc11dM



And here is the jsfiddle of the gif: https://jsfiddle.net/w9yk7n54/



When you click on new notification button, already displayed notifications jump up to make room for the new notification and new notification slides in. I was wondering how I could make it so that they all smoothly go up together.



The notifications wont all be the same dimensions so I cant set static values for height/etc.



Thank you!






let btn = document.querySelector('button')
let container = document.querySelector('.notifications-container')

let notif_contents = [
"<p>1</p><p>1</p><p>1</p><p>1</p>",
"<p>test</p>",
"<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
]
let current = 0

btn.onclick = () =>

let notif = document.createElement('div')
notif.classList.add('notif')
notif.innerHTML = notif_contents[current]
notif.addEventListener('animationend', () =>
notif.parentElement.removeChild(notif)
)
current++

container.append(notif)

* 
box-sizing: border-box;


.container
height: 300px;
width: 400px;
border: 1px solid black;
position: absolute;


.notifications-container
position: absolute;
top: 0;
right: 0;
height: 100%;
width: 200px;
background: rgba( 0, 0, 0, 0.2);
display: flex;
flex-flow: column nowrap;
justify-content: flex-end;
overflow: hidden;


.notif
position: relative;
width: 100%;
padding: 10px;
border: 1px solid black;
animation: notifAnim 5s forwards;
transition: all .2s;
background: white;


button
z-index: 100;
background: lightcoral;
color: white;
border: none;
padding: 10px;
font-size: 20px;
margin: 5px;


@keyframes notifAnim
0%
transform: translateY( 100%)

20%
transform: translateY( 0)

80%
transform: translateY( 0)

100%
transform: translateY( 100%)


<div class="container">
<button>New Notification</button>
<div class="notifications-container"></div>
</div>












share|improve this question




























    3















    I am trying to implement a notification system in my app without the use of a library. Here is a gif of the issue: https://imgur.com/oRc11dM



    And here is the jsfiddle of the gif: https://jsfiddle.net/w9yk7n54/



    When you click on new notification button, already displayed notifications jump up to make room for the new notification and new notification slides in. I was wondering how I could make it so that they all smoothly go up together.



    The notifications wont all be the same dimensions so I cant set static values for height/etc.



    Thank you!






    let btn = document.querySelector('button')
    let container = document.querySelector('.notifications-container')

    let notif_contents = [
    "<p>1</p><p>1</p><p>1</p><p>1</p>",
    "<p>test</p>",
    "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
    ]
    let current = 0

    btn.onclick = () =>

    let notif = document.createElement('div')
    notif.classList.add('notif')
    notif.innerHTML = notif_contents[current]
    notif.addEventListener('animationend', () =>
    notif.parentElement.removeChild(notif)
    )
    current++

    container.append(notif)

    * 
    box-sizing: border-box;


    .container
    height: 300px;
    width: 400px;
    border: 1px solid black;
    position: absolute;


    .notifications-container
    position: absolute;
    top: 0;
    right: 0;
    height: 100%;
    width: 200px;
    background: rgba( 0, 0, 0, 0.2);
    display: flex;
    flex-flow: column nowrap;
    justify-content: flex-end;
    overflow: hidden;


    .notif
    position: relative;
    width: 100%;
    padding: 10px;
    border: 1px solid black;
    animation: notifAnim 5s forwards;
    transition: all .2s;
    background: white;


    button
    z-index: 100;
    background: lightcoral;
    color: white;
    border: none;
    padding: 10px;
    font-size: 20px;
    margin: 5px;


    @keyframes notifAnim
    0%
    transform: translateY( 100%)

    20%
    transform: translateY( 0)

    80%
    transform: translateY( 0)

    100%
    transform: translateY( 100%)


    <div class="container">
    <button>New Notification</button>
    <div class="notifications-container"></div>
    </div>












    share|improve this question


























      3












      3








      3








      I am trying to implement a notification system in my app without the use of a library. Here is a gif of the issue: https://imgur.com/oRc11dM



      And here is the jsfiddle of the gif: https://jsfiddle.net/w9yk7n54/



      When you click on new notification button, already displayed notifications jump up to make room for the new notification and new notification slides in. I was wondering how I could make it so that they all smoothly go up together.



      The notifications wont all be the same dimensions so I cant set static values for height/etc.



      Thank you!






      let btn = document.querySelector('button')
      let container = document.querySelector('.notifications-container')

      let notif_contents = [
      "<p>1</p><p>1</p><p>1</p><p>1</p>",
      "<p>test</p>",
      "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
      ]
      let current = 0

      btn.onclick = () =>

      let notif = document.createElement('div')
      notif.classList.add('notif')
      notif.innerHTML = notif_contents[current]
      notif.addEventListener('animationend', () =>
      notif.parentElement.removeChild(notif)
      )
      current++

      container.append(notif)

      * 
      box-sizing: border-box;


      .container
      height: 300px;
      width: 400px;
      border: 1px solid black;
      position: absolute;


      .notifications-container
      position: absolute;
      top: 0;
      right: 0;
      height: 100%;
      width: 200px;
      background: rgba( 0, 0, 0, 0.2);
      display: flex;
      flex-flow: column nowrap;
      justify-content: flex-end;
      overflow: hidden;


      .notif
      position: relative;
      width: 100%;
      padding: 10px;
      border: 1px solid black;
      animation: notifAnim 5s forwards;
      transition: all .2s;
      background: white;


      button
      z-index: 100;
      background: lightcoral;
      color: white;
      border: none;
      padding: 10px;
      font-size: 20px;
      margin: 5px;


      @keyframes notifAnim
      0%
      transform: translateY( 100%)

      20%
      transform: translateY( 0)

      80%
      transform: translateY( 0)

      100%
      transform: translateY( 100%)


      <div class="container">
      <button>New Notification</button>
      <div class="notifications-container"></div>
      </div>












      share|improve this question
















      I am trying to implement a notification system in my app without the use of a library. Here is a gif of the issue: https://imgur.com/oRc11dM



      And here is the jsfiddle of the gif: https://jsfiddle.net/w9yk7n54/



      When you click on new notification button, already displayed notifications jump up to make room for the new notification and new notification slides in. I was wondering how I could make it so that they all smoothly go up together.



      The notifications wont all be the same dimensions so I cant set static values for height/etc.



      Thank you!






      let btn = document.querySelector('button')
      let container = document.querySelector('.notifications-container')

      let notif_contents = [
      "<p>1</p><p>1</p><p>1</p><p>1</p>",
      "<p>test</p>",
      "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
      ]
      let current = 0

      btn.onclick = () =>

      let notif = document.createElement('div')
      notif.classList.add('notif')
      notif.innerHTML = notif_contents[current]
      notif.addEventListener('animationend', () =>
      notif.parentElement.removeChild(notif)
      )
      current++

      container.append(notif)

      * 
      box-sizing: border-box;


      .container
      height: 300px;
      width: 400px;
      border: 1px solid black;
      position: absolute;


      .notifications-container
      position: absolute;
      top: 0;
      right: 0;
      height: 100%;
      width: 200px;
      background: rgba( 0, 0, 0, 0.2);
      display: flex;
      flex-flow: column nowrap;
      justify-content: flex-end;
      overflow: hidden;


      .notif
      position: relative;
      width: 100%;
      padding: 10px;
      border: 1px solid black;
      animation: notifAnim 5s forwards;
      transition: all .2s;
      background: white;


      button
      z-index: 100;
      background: lightcoral;
      color: white;
      border: none;
      padding: 10px;
      font-size: 20px;
      margin: 5px;


      @keyframes notifAnim
      0%
      transform: translateY( 100%)

      20%
      transform: translateY( 0)

      80%
      transform: translateY( 0)

      100%
      transform: translateY( 100%)


      <div class="container">
      <button>New Notification</button>
      <div class="notifications-container"></div>
      </div>








      let btn = document.querySelector('button')
      let container = document.querySelector('.notifications-container')

      let notif_contents = [
      "<p>1</p><p>1</p><p>1</p><p>1</p>",
      "<p>test</p>",
      "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
      ]
      let current = 0

      btn.onclick = () =>

      let notif = document.createElement('div')
      notif.classList.add('notif')
      notif.innerHTML = notif_contents[current]
      notif.addEventListener('animationend', () =>
      notif.parentElement.removeChild(notif)
      )
      current++

      container.append(notif)

      * 
      box-sizing: border-box;


      .container
      height: 300px;
      width: 400px;
      border: 1px solid black;
      position: absolute;


      .notifications-container
      position: absolute;
      top: 0;
      right: 0;
      height: 100%;
      width: 200px;
      background: rgba( 0, 0, 0, 0.2);
      display: flex;
      flex-flow: column nowrap;
      justify-content: flex-end;
      overflow: hidden;


      .notif
      position: relative;
      width: 100%;
      padding: 10px;
      border: 1px solid black;
      animation: notifAnim 5s forwards;
      transition: all .2s;
      background: white;


      button
      z-index: 100;
      background: lightcoral;
      color: white;
      border: none;
      padding: 10px;
      font-size: 20px;
      margin: 5px;


      @keyframes notifAnim
      0%
      transform: translateY( 100%)

      20%
      transform: translateY( 0)

      80%
      transform: translateY( 0)

      100%
      transform: translateY( 100%)


      <div class="container">
      <button>New Notification</button>
      <div class="notifications-container"></div>
      </div>





      let btn = document.querySelector('button')
      let container = document.querySelector('.notifications-container')

      let notif_contents = [
      "<p>1</p><p>1</p><p>1</p><p>1</p>",
      "<p>test</p>",
      "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
      ]
      let current = 0

      btn.onclick = () =>

      let notif = document.createElement('div')
      notif.classList.add('notif')
      notif.innerHTML = notif_contents[current]
      notif.addEventListener('animationend', () =>
      notif.parentElement.removeChild(notif)
      )
      current++

      container.append(notif)

      * 
      box-sizing: border-box;


      .container
      height: 300px;
      width: 400px;
      border: 1px solid black;
      position: absolute;


      .notifications-container
      position: absolute;
      top: 0;
      right: 0;
      height: 100%;
      width: 200px;
      background: rgba( 0, 0, 0, 0.2);
      display: flex;
      flex-flow: column nowrap;
      justify-content: flex-end;
      overflow: hidden;


      .notif
      position: relative;
      width: 100%;
      padding: 10px;
      border: 1px solid black;
      animation: notifAnim 5s forwards;
      transition: all .2s;
      background: white;


      button
      z-index: 100;
      background: lightcoral;
      color: white;
      border: none;
      padding: 10px;
      font-size: 20px;
      margin: 5px;


      @keyframes notifAnim
      0%
      transform: translateY( 100%)

      20%
      transform: translateY( 0)

      80%
      transform: translateY( 0)

      100%
      transform: translateY( 100%)


      <div class="container">
      <button>New Notification</button>
      <div class="notifications-container"></div>
      </div>






      javascript css animation css-animations






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 14 '18 at 23:20









      Andrei Gheorghiu

      35.7k74774




      35.7k74774










      asked Nov 14 '18 at 21:05









      SynSyn

      645




      645






















          2 Answers
          2






          active

          oldest

          votes


















          1














          Your notif container has justify-content: flex-end. This means that whenever you add a new one, the previous ones will be pushed up with the height of the new one.



          The "fix" is to give each element a negative margin-top equal to its height and integrate in your current transition getting margin-top back to 0.



          Example:






          let btn = document.querySelector('button'),
          container = document.querySelector('.notifications-container'),
          notif_contents = [
          "<p>1</p><p>1</p><p>1</p><p>1</p>",
          "<p>test</p>",
          "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",
          "<code>another.test()</code>",
          "<strong>another</strong> <i>test</i>"
          ]

          btn.onclick = () =>
          let notif = document.createElement('div'),
          index = Math.floor(Math.random() * notif_contents.length)
          notif.classList.add('notif')
          notif.innerHTML = notif_contents[index]
          notif.addEventListener('animationend', () =>
          notif.parentElement.removeChild(notif)
          )

          container.append(notif)
          notif.style.marginTop = '-' + notif.offsetHeight + 'px'

          * 
          box-sizing: border-box;


          .container
          height: 300px;
          width: 400px;
          border: 1px solid #888;
          position: absolute;


          .notifications-container
          position: absolute;
          top: 0;
          right: 0;
          height: 100%;
          width: 200px;
          background: rgba( 0, 0, 0, 0.2);
          display: flex;
          flex-flow: column nowrap;
          justify-content: flex-end;
          overflow: hidden;


          .notif
          position: relative;
          width: 100%;
          padding: 10px;
          border: 1px solid #ddd;
          border-bottom: none;
          animation: notifAnim 5s forwards;
          background: white;


          button
          z-index: 100;
          background: lightcoral;
          color: white;
          border: none;
          padding: 10px;
          font-size: 20px;
          margin: 5px;


          @keyframes notifAnim
          0%,
          100%
          transform: translateY( 100%)

          20%,
          80%
          transform: translateY( 0);
          margin-top: 0


          <div class="container">
          <button>New Notification</button>
          <div class="notifications-container"></div>
          </div>








          share|improve this answer
































            0














            An idea is to insert new element with a height equal to 0 and you animate the height in addition to translate. Of course, you should use max-height since height are unknown and we cannot animate to auto:






            let btn = document.querySelector('button')
            let container = document.querySelector('.notifications-container')

            let notif_contents = [
            "<p>1</p><p>1</p><p>1</p><p>1</p>",
            "<p>test</p>",
            "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
            ]
            let current = 0

            btn.onclick = () =>

            let notif = document.createElement('div')
            notif.classList.add('notif')
            notif.innerHTML = notif_contents[current]
            notif.addEventListener('animationend', () =>
            notif.parentElement.removeChild(notif)
            )
            current++

            container.append(notif)

            * 
            box-sizing: border-box;


            .container
            height: 300px;
            width: 400px;
            border: 1px solid black;
            position: absolute;


            .notifications-container
            position: absolute;
            top: 0;
            right: 0;
            height: 100%;
            width: 200px;
            background: rgba( 0, 0, 0, 0.2);
            display: flex;
            flex-flow: column nowrap;
            justify-content: flex-end;
            overflow: hidden;


            .notif
            position: relative;
            width: 100%;
            padding:0 10px;
            max-height:0px;
            border: 1px solid black;
            animation: notifAnim 5s forwards;
            transition: all .2s;
            background: white;


            button
            z-index: 100;
            background: lightcoral;
            color: white;
            border: none;
            padding: 10px;
            font-size: 20px;
            margin: 5px;


            @keyframes notifAnim
            0%
            transform: translateY( 100%);
            max-height:0;
            padding:0 10px;

            30%
            transform: translateY( 0);
            max-height:300px;
            padding:10px;

            80%
            transform: translateY( 0);
            max-height:300px;
            padding:10px;

            100%
            transform: translateY( 100%);
            max-height:300px;
            padding:10px;


            <div class="container">
            <button>New Notification</button>
            <div class="notifications-container"></div>
            </div>








            share|improve this answer























            • While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

              – Andrei Gheorghiu
              Nov 14 '18 at 22:11











            • @AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

              – Temani Afif
              Nov 14 '18 at 22:17











            • If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

              – Andrei Gheorghiu
              Nov 14 '18 at 22:20











            • @AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

              – Temani Afif
              Nov 14 '18 at 22:29










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            2 Answers
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            2 Answers
            2






            active

            oldest

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            active

            oldest

            votes






            active

            oldest

            votes









            1














            Your notif container has justify-content: flex-end. This means that whenever you add a new one, the previous ones will be pushed up with the height of the new one.



            The "fix" is to give each element a negative margin-top equal to its height and integrate in your current transition getting margin-top back to 0.



            Example:






            let btn = document.querySelector('button'),
            container = document.querySelector('.notifications-container'),
            notif_contents = [
            "<p>1</p><p>1</p><p>1</p><p>1</p>",
            "<p>test</p>",
            "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",
            "<code>another.test()</code>",
            "<strong>another</strong> <i>test</i>"
            ]

            btn.onclick = () =>
            let notif = document.createElement('div'),
            index = Math.floor(Math.random() * notif_contents.length)
            notif.classList.add('notif')
            notif.innerHTML = notif_contents[index]
            notif.addEventListener('animationend', () =>
            notif.parentElement.removeChild(notif)
            )

            container.append(notif)
            notif.style.marginTop = '-' + notif.offsetHeight + 'px'

            * 
            box-sizing: border-box;


            .container
            height: 300px;
            width: 400px;
            border: 1px solid #888;
            position: absolute;


            .notifications-container
            position: absolute;
            top: 0;
            right: 0;
            height: 100%;
            width: 200px;
            background: rgba( 0, 0, 0, 0.2);
            display: flex;
            flex-flow: column nowrap;
            justify-content: flex-end;
            overflow: hidden;


            .notif
            position: relative;
            width: 100%;
            padding: 10px;
            border: 1px solid #ddd;
            border-bottom: none;
            animation: notifAnim 5s forwards;
            background: white;


            button
            z-index: 100;
            background: lightcoral;
            color: white;
            border: none;
            padding: 10px;
            font-size: 20px;
            margin: 5px;


            @keyframes notifAnim
            0%,
            100%
            transform: translateY( 100%)

            20%,
            80%
            transform: translateY( 0);
            margin-top: 0


            <div class="container">
            <button>New Notification</button>
            <div class="notifications-container"></div>
            </div>








            share|improve this answer





























              1














              Your notif container has justify-content: flex-end. This means that whenever you add a new one, the previous ones will be pushed up with the height of the new one.



              The "fix" is to give each element a negative margin-top equal to its height and integrate in your current transition getting margin-top back to 0.



              Example:






              let btn = document.querySelector('button'),
              container = document.querySelector('.notifications-container'),
              notif_contents = [
              "<p>1</p><p>1</p><p>1</p><p>1</p>",
              "<p>test</p>",
              "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",
              "<code>another.test()</code>",
              "<strong>another</strong> <i>test</i>"
              ]

              btn.onclick = () =>
              let notif = document.createElement('div'),
              index = Math.floor(Math.random() * notif_contents.length)
              notif.classList.add('notif')
              notif.innerHTML = notif_contents[index]
              notif.addEventListener('animationend', () =>
              notif.parentElement.removeChild(notif)
              )

              container.append(notif)
              notif.style.marginTop = '-' + notif.offsetHeight + 'px'

              * 
              box-sizing: border-box;


              .container
              height: 300px;
              width: 400px;
              border: 1px solid #888;
              position: absolute;


              .notifications-container
              position: absolute;
              top: 0;
              right: 0;
              height: 100%;
              width: 200px;
              background: rgba( 0, 0, 0, 0.2);
              display: flex;
              flex-flow: column nowrap;
              justify-content: flex-end;
              overflow: hidden;


              .notif
              position: relative;
              width: 100%;
              padding: 10px;
              border: 1px solid #ddd;
              border-bottom: none;
              animation: notifAnim 5s forwards;
              background: white;


              button
              z-index: 100;
              background: lightcoral;
              color: white;
              border: none;
              padding: 10px;
              font-size: 20px;
              margin: 5px;


              @keyframes notifAnim
              0%,
              100%
              transform: translateY( 100%)

              20%,
              80%
              transform: translateY( 0);
              margin-top: 0


              <div class="container">
              <button>New Notification</button>
              <div class="notifications-container"></div>
              </div>








              share|improve this answer



























                1












                1








                1







                Your notif container has justify-content: flex-end. This means that whenever you add a new one, the previous ones will be pushed up with the height of the new one.



                The "fix" is to give each element a negative margin-top equal to its height and integrate in your current transition getting margin-top back to 0.



                Example:






                let btn = document.querySelector('button'),
                container = document.querySelector('.notifications-container'),
                notif_contents = [
                "<p>1</p><p>1</p><p>1</p><p>1</p>",
                "<p>test</p>",
                "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",
                "<code>another.test()</code>",
                "<strong>another</strong> <i>test</i>"
                ]

                btn.onclick = () =>
                let notif = document.createElement('div'),
                index = Math.floor(Math.random() * notif_contents.length)
                notif.classList.add('notif')
                notif.innerHTML = notif_contents[index]
                notif.addEventListener('animationend', () =>
                notif.parentElement.removeChild(notif)
                )

                container.append(notif)
                notif.style.marginTop = '-' + notif.offsetHeight + 'px'

                * 
                box-sizing: border-box;


                .container
                height: 300px;
                width: 400px;
                border: 1px solid #888;
                position: absolute;


                .notifications-container
                position: absolute;
                top: 0;
                right: 0;
                height: 100%;
                width: 200px;
                background: rgba( 0, 0, 0, 0.2);
                display: flex;
                flex-flow: column nowrap;
                justify-content: flex-end;
                overflow: hidden;


                .notif
                position: relative;
                width: 100%;
                padding: 10px;
                border: 1px solid #ddd;
                border-bottom: none;
                animation: notifAnim 5s forwards;
                background: white;


                button
                z-index: 100;
                background: lightcoral;
                color: white;
                border: none;
                padding: 10px;
                font-size: 20px;
                margin: 5px;


                @keyframes notifAnim
                0%,
                100%
                transform: translateY( 100%)

                20%,
                80%
                transform: translateY( 0);
                margin-top: 0


                <div class="container">
                <button>New Notification</button>
                <div class="notifications-container"></div>
                </div>








                share|improve this answer















                Your notif container has justify-content: flex-end. This means that whenever you add a new one, the previous ones will be pushed up with the height of the new one.



                The "fix" is to give each element a negative margin-top equal to its height and integrate in your current transition getting margin-top back to 0.



                Example:






                let btn = document.querySelector('button'),
                container = document.querySelector('.notifications-container'),
                notif_contents = [
                "<p>1</p><p>1</p><p>1</p><p>1</p>",
                "<p>test</p>",
                "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",
                "<code>another.test()</code>",
                "<strong>another</strong> <i>test</i>"
                ]

                btn.onclick = () =>
                let notif = document.createElement('div'),
                index = Math.floor(Math.random() * notif_contents.length)
                notif.classList.add('notif')
                notif.innerHTML = notif_contents[index]
                notif.addEventListener('animationend', () =>
                notif.parentElement.removeChild(notif)
                )

                container.append(notif)
                notif.style.marginTop = '-' + notif.offsetHeight + 'px'

                * 
                box-sizing: border-box;


                .container
                height: 300px;
                width: 400px;
                border: 1px solid #888;
                position: absolute;


                .notifications-container
                position: absolute;
                top: 0;
                right: 0;
                height: 100%;
                width: 200px;
                background: rgba( 0, 0, 0, 0.2);
                display: flex;
                flex-flow: column nowrap;
                justify-content: flex-end;
                overflow: hidden;


                .notif
                position: relative;
                width: 100%;
                padding: 10px;
                border: 1px solid #ddd;
                border-bottom: none;
                animation: notifAnim 5s forwards;
                background: white;


                button
                z-index: 100;
                background: lightcoral;
                color: white;
                border: none;
                padding: 10px;
                font-size: 20px;
                margin: 5px;


                @keyframes notifAnim
                0%,
                100%
                transform: translateY( 100%)

                20%,
                80%
                transform: translateY( 0);
                margin-top: 0


                <div class="container">
                <button>New Notification</button>
                <div class="notifications-container"></div>
                </div>








                let btn = document.querySelector('button'),
                container = document.querySelector('.notifications-container'),
                notif_contents = [
                "<p>1</p><p>1</p><p>1</p><p>1</p>",
                "<p>test</p>",
                "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",
                "<code>another.test()</code>",
                "<strong>another</strong> <i>test</i>"
                ]

                btn.onclick = () =>
                let notif = document.createElement('div'),
                index = Math.floor(Math.random() * notif_contents.length)
                notif.classList.add('notif')
                notif.innerHTML = notif_contents[index]
                notif.addEventListener('animationend', () =>
                notif.parentElement.removeChild(notif)
                )

                container.append(notif)
                notif.style.marginTop = '-' + notif.offsetHeight + 'px'

                * 
                box-sizing: border-box;


                .container
                height: 300px;
                width: 400px;
                border: 1px solid #888;
                position: absolute;


                .notifications-container
                position: absolute;
                top: 0;
                right: 0;
                height: 100%;
                width: 200px;
                background: rgba( 0, 0, 0, 0.2);
                display: flex;
                flex-flow: column nowrap;
                justify-content: flex-end;
                overflow: hidden;


                .notif
                position: relative;
                width: 100%;
                padding: 10px;
                border: 1px solid #ddd;
                border-bottom: none;
                animation: notifAnim 5s forwards;
                background: white;


                button
                z-index: 100;
                background: lightcoral;
                color: white;
                border: none;
                padding: 10px;
                font-size: 20px;
                margin: 5px;


                @keyframes notifAnim
                0%,
                100%
                transform: translateY( 100%)

                20%,
                80%
                transform: translateY( 0);
                margin-top: 0


                <div class="container">
                <button>New Notification</button>
                <div class="notifications-container"></div>
                </div>





                let btn = document.querySelector('button'),
                container = document.querySelector('.notifications-container'),
                notif_contents = [
                "<p>1</p><p>1</p><p>1</p><p>1</p>",
                "<p>test</p>",
                "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>",
                "<code>another.test()</code>",
                "<strong>another</strong> <i>test</i>"
                ]

                btn.onclick = () =>
                let notif = document.createElement('div'),
                index = Math.floor(Math.random() * notif_contents.length)
                notif.classList.add('notif')
                notif.innerHTML = notif_contents[index]
                notif.addEventListener('animationend', () =>
                notif.parentElement.removeChild(notif)
                )

                container.append(notif)
                notif.style.marginTop = '-' + notif.offsetHeight + 'px'

                * 
                box-sizing: border-box;


                .container
                height: 300px;
                width: 400px;
                border: 1px solid #888;
                position: absolute;


                .notifications-container
                position: absolute;
                top: 0;
                right: 0;
                height: 100%;
                width: 200px;
                background: rgba( 0, 0, 0, 0.2);
                display: flex;
                flex-flow: column nowrap;
                justify-content: flex-end;
                overflow: hidden;


                .notif
                position: relative;
                width: 100%;
                padding: 10px;
                border: 1px solid #ddd;
                border-bottom: none;
                animation: notifAnim 5s forwards;
                background: white;


                button
                z-index: 100;
                background: lightcoral;
                color: white;
                border: none;
                padding: 10px;
                font-size: 20px;
                margin: 5px;


                @keyframes notifAnim
                0%,
                100%
                transform: translateY( 100%)

                20%,
                80%
                transform: translateY( 0);
                margin-top: 0


                <div class="container">
                <button>New Notification</button>
                <div class="notifications-container"></div>
                </div>






                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited Nov 14 '18 at 22:48

























                answered Nov 14 '18 at 22:06









                Andrei GheorghiuAndrei Gheorghiu

                35.7k74774




                35.7k74774























                    0














                    An idea is to insert new element with a height equal to 0 and you animate the height in addition to translate. Of course, you should use max-height since height are unknown and we cannot animate to auto:






                    let btn = document.querySelector('button')
                    let container = document.querySelector('.notifications-container')

                    let notif_contents = [
                    "<p>1</p><p>1</p><p>1</p><p>1</p>",
                    "<p>test</p>",
                    "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
                    ]
                    let current = 0

                    btn.onclick = () =>

                    let notif = document.createElement('div')
                    notif.classList.add('notif')
                    notif.innerHTML = notif_contents[current]
                    notif.addEventListener('animationend', () =>
                    notif.parentElement.removeChild(notif)
                    )
                    current++

                    container.append(notif)

                    * 
                    box-sizing: border-box;


                    .container
                    height: 300px;
                    width: 400px;
                    border: 1px solid black;
                    position: absolute;


                    .notifications-container
                    position: absolute;
                    top: 0;
                    right: 0;
                    height: 100%;
                    width: 200px;
                    background: rgba( 0, 0, 0, 0.2);
                    display: flex;
                    flex-flow: column nowrap;
                    justify-content: flex-end;
                    overflow: hidden;


                    .notif
                    position: relative;
                    width: 100%;
                    padding:0 10px;
                    max-height:0px;
                    border: 1px solid black;
                    animation: notifAnim 5s forwards;
                    transition: all .2s;
                    background: white;


                    button
                    z-index: 100;
                    background: lightcoral;
                    color: white;
                    border: none;
                    padding: 10px;
                    font-size: 20px;
                    margin: 5px;


                    @keyframes notifAnim
                    0%
                    transform: translateY( 100%);
                    max-height:0;
                    padding:0 10px;

                    30%
                    transform: translateY( 0);
                    max-height:300px;
                    padding:10px;

                    80%
                    transform: translateY( 0);
                    max-height:300px;
                    padding:10px;

                    100%
                    transform: translateY( 100%);
                    max-height:300px;
                    padding:10px;


                    <div class="container">
                    <button>New Notification</button>
                    <div class="notifications-container"></div>
                    </div>








                    share|improve this answer























                    • While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

                      – Andrei Gheorghiu
                      Nov 14 '18 at 22:11











                    • @AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

                      – Temani Afif
                      Nov 14 '18 at 22:17











                    • If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

                      – Andrei Gheorghiu
                      Nov 14 '18 at 22:20











                    • @AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

                      – Temani Afif
                      Nov 14 '18 at 22:29















                    0














                    An idea is to insert new element with a height equal to 0 and you animate the height in addition to translate. Of course, you should use max-height since height are unknown and we cannot animate to auto:






                    let btn = document.querySelector('button')
                    let container = document.querySelector('.notifications-container')

                    let notif_contents = [
                    "<p>1</p><p>1</p><p>1</p><p>1</p>",
                    "<p>test</p>",
                    "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
                    ]
                    let current = 0

                    btn.onclick = () =>

                    let notif = document.createElement('div')
                    notif.classList.add('notif')
                    notif.innerHTML = notif_contents[current]
                    notif.addEventListener('animationend', () =>
                    notif.parentElement.removeChild(notif)
                    )
                    current++

                    container.append(notif)

                    * 
                    box-sizing: border-box;


                    .container
                    height: 300px;
                    width: 400px;
                    border: 1px solid black;
                    position: absolute;


                    .notifications-container
                    position: absolute;
                    top: 0;
                    right: 0;
                    height: 100%;
                    width: 200px;
                    background: rgba( 0, 0, 0, 0.2);
                    display: flex;
                    flex-flow: column nowrap;
                    justify-content: flex-end;
                    overflow: hidden;


                    .notif
                    position: relative;
                    width: 100%;
                    padding:0 10px;
                    max-height:0px;
                    border: 1px solid black;
                    animation: notifAnim 5s forwards;
                    transition: all .2s;
                    background: white;


                    button
                    z-index: 100;
                    background: lightcoral;
                    color: white;
                    border: none;
                    padding: 10px;
                    font-size: 20px;
                    margin: 5px;


                    @keyframes notifAnim
                    0%
                    transform: translateY( 100%);
                    max-height:0;
                    padding:0 10px;

                    30%
                    transform: translateY( 0);
                    max-height:300px;
                    padding:10px;

                    80%
                    transform: translateY( 0);
                    max-height:300px;
                    padding:10px;

                    100%
                    transform: translateY( 100%);
                    max-height:300px;
                    padding:10px;


                    <div class="container">
                    <button>New Notification</button>
                    <div class="notifications-container"></div>
                    </div>








                    share|improve this answer























                    • While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

                      – Andrei Gheorghiu
                      Nov 14 '18 at 22:11











                    • @AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

                      – Temani Afif
                      Nov 14 '18 at 22:17











                    • If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

                      – Andrei Gheorghiu
                      Nov 14 '18 at 22:20











                    • @AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

                      – Temani Afif
                      Nov 14 '18 at 22:29













                    0












                    0








                    0







                    An idea is to insert new element with a height equal to 0 and you animate the height in addition to translate. Of course, you should use max-height since height are unknown and we cannot animate to auto:






                    let btn = document.querySelector('button')
                    let container = document.querySelector('.notifications-container')

                    let notif_contents = [
                    "<p>1</p><p>1</p><p>1</p><p>1</p>",
                    "<p>test</p>",
                    "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
                    ]
                    let current = 0

                    btn.onclick = () =>

                    let notif = document.createElement('div')
                    notif.classList.add('notif')
                    notif.innerHTML = notif_contents[current]
                    notif.addEventListener('animationend', () =>
                    notif.parentElement.removeChild(notif)
                    )
                    current++

                    container.append(notif)

                    * 
                    box-sizing: border-box;


                    .container
                    height: 300px;
                    width: 400px;
                    border: 1px solid black;
                    position: absolute;


                    .notifications-container
                    position: absolute;
                    top: 0;
                    right: 0;
                    height: 100%;
                    width: 200px;
                    background: rgba( 0, 0, 0, 0.2);
                    display: flex;
                    flex-flow: column nowrap;
                    justify-content: flex-end;
                    overflow: hidden;


                    .notif
                    position: relative;
                    width: 100%;
                    padding:0 10px;
                    max-height:0px;
                    border: 1px solid black;
                    animation: notifAnim 5s forwards;
                    transition: all .2s;
                    background: white;


                    button
                    z-index: 100;
                    background: lightcoral;
                    color: white;
                    border: none;
                    padding: 10px;
                    font-size: 20px;
                    margin: 5px;


                    @keyframes notifAnim
                    0%
                    transform: translateY( 100%);
                    max-height:0;
                    padding:0 10px;

                    30%
                    transform: translateY( 0);
                    max-height:300px;
                    padding:10px;

                    80%
                    transform: translateY( 0);
                    max-height:300px;
                    padding:10px;

                    100%
                    transform: translateY( 100%);
                    max-height:300px;
                    padding:10px;


                    <div class="container">
                    <button>New Notification</button>
                    <div class="notifications-container"></div>
                    </div>








                    share|improve this answer













                    An idea is to insert new element with a height equal to 0 and you animate the height in addition to translate. Of course, you should use max-height since height are unknown and we cannot animate to auto:






                    let btn = document.querySelector('button')
                    let container = document.querySelector('.notifications-container')

                    let notif_contents = [
                    "<p>1</p><p>1</p><p>1</p><p>1</p>",
                    "<p>test</p>",
                    "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
                    ]
                    let current = 0

                    btn.onclick = () =>

                    let notif = document.createElement('div')
                    notif.classList.add('notif')
                    notif.innerHTML = notif_contents[current]
                    notif.addEventListener('animationend', () =>
                    notif.parentElement.removeChild(notif)
                    )
                    current++

                    container.append(notif)

                    * 
                    box-sizing: border-box;


                    .container
                    height: 300px;
                    width: 400px;
                    border: 1px solid black;
                    position: absolute;


                    .notifications-container
                    position: absolute;
                    top: 0;
                    right: 0;
                    height: 100%;
                    width: 200px;
                    background: rgba( 0, 0, 0, 0.2);
                    display: flex;
                    flex-flow: column nowrap;
                    justify-content: flex-end;
                    overflow: hidden;


                    .notif
                    position: relative;
                    width: 100%;
                    padding:0 10px;
                    max-height:0px;
                    border: 1px solid black;
                    animation: notifAnim 5s forwards;
                    transition: all .2s;
                    background: white;


                    button
                    z-index: 100;
                    background: lightcoral;
                    color: white;
                    border: none;
                    padding: 10px;
                    font-size: 20px;
                    margin: 5px;


                    @keyframes notifAnim
                    0%
                    transform: translateY( 100%);
                    max-height:0;
                    padding:0 10px;

                    30%
                    transform: translateY( 0);
                    max-height:300px;
                    padding:10px;

                    80%
                    transform: translateY( 0);
                    max-height:300px;
                    padding:10px;

                    100%
                    transform: translateY( 100%);
                    max-height:300px;
                    padding:10px;


                    <div class="container">
                    <button>New Notification</button>
                    <div class="notifications-container"></div>
                    </div>








                    let btn = document.querySelector('button')
                    let container = document.querySelector('.notifications-container')

                    let notif_contents = [
                    "<p>1</p><p>1</p><p>1</p><p>1</p>",
                    "<p>test</p>",
                    "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
                    ]
                    let current = 0

                    btn.onclick = () =>

                    let notif = document.createElement('div')
                    notif.classList.add('notif')
                    notif.innerHTML = notif_contents[current]
                    notif.addEventListener('animationend', () =>
                    notif.parentElement.removeChild(notif)
                    )
                    current++

                    container.append(notif)

                    * 
                    box-sizing: border-box;


                    .container
                    height: 300px;
                    width: 400px;
                    border: 1px solid black;
                    position: absolute;


                    .notifications-container
                    position: absolute;
                    top: 0;
                    right: 0;
                    height: 100%;
                    width: 200px;
                    background: rgba( 0, 0, 0, 0.2);
                    display: flex;
                    flex-flow: column nowrap;
                    justify-content: flex-end;
                    overflow: hidden;


                    .notif
                    position: relative;
                    width: 100%;
                    padding:0 10px;
                    max-height:0px;
                    border: 1px solid black;
                    animation: notifAnim 5s forwards;
                    transition: all .2s;
                    background: white;


                    button
                    z-index: 100;
                    background: lightcoral;
                    color: white;
                    border: none;
                    padding: 10px;
                    font-size: 20px;
                    margin: 5px;


                    @keyframes notifAnim
                    0%
                    transform: translateY( 100%);
                    max-height:0;
                    padding:0 10px;

                    30%
                    transform: translateY( 0);
                    max-height:300px;
                    padding:10px;

                    80%
                    transform: translateY( 0);
                    max-height:300px;
                    padding:10px;

                    100%
                    transform: translateY( 100%);
                    max-height:300px;
                    padding:10px;


                    <div class="container">
                    <button>New Notification</button>
                    <div class="notifications-container"></div>
                    </div>





                    let btn = document.querySelector('button')
                    let container = document.querySelector('.notifications-container')

                    let notif_contents = [
                    "<p>1</p><p>1</p><p>1</p><p>1</p>",
                    "<p>test</p>",
                    "<div><h1>testtesttest</h1><p>yoloalsdfasdf</p></div>"
                    ]
                    let current = 0

                    btn.onclick = () =>

                    let notif = document.createElement('div')
                    notif.classList.add('notif')
                    notif.innerHTML = notif_contents[current]
                    notif.addEventListener('animationend', () =>
                    notif.parentElement.removeChild(notif)
                    )
                    current++

                    container.append(notif)

                    * 
                    box-sizing: border-box;


                    .container
                    height: 300px;
                    width: 400px;
                    border: 1px solid black;
                    position: absolute;


                    .notifications-container
                    position: absolute;
                    top: 0;
                    right: 0;
                    height: 100%;
                    width: 200px;
                    background: rgba( 0, 0, 0, 0.2);
                    display: flex;
                    flex-flow: column nowrap;
                    justify-content: flex-end;
                    overflow: hidden;


                    .notif
                    position: relative;
                    width: 100%;
                    padding:0 10px;
                    max-height:0px;
                    border: 1px solid black;
                    animation: notifAnim 5s forwards;
                    transition: all .2s;
                    background: white;


                    button
                    z-index: 100;
                    background: lightcoral;
                    color: white;
                    border: none;
                    padding: 10px;
                    font-size: 20px;
                    margin: 5px;


                    @keyframes notifAnim
                    0%
                    transform: translateY( 100%);
                    max-height:0;
                    padding:0 10px;

                    30%
                    transform: translateY( 0);
                    max-height:300px;
                    padding:10px;

                    80%
                    transform: translateY( 0);
                    max-height:300px;
                    padding:10px;

                    100%
                    transform: translateY( 100%);
                    max-height:300px;
                    padding:10px;


                    <div class="container">
                    <button>New Notification</button>
                    <div class="notifications-container"></div>
                    </div>






                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered Nov 14 '18 at 21:41









                    Temani AfifTemani Afif

                    75.6k94386




                    75.6k94386












                    • While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

                      – Andrei Gheorghiu
                      Nov 14 '18 at 22:11











                    • @AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

                      – Temani Afif
                      Nov 14 '18 at 22:17











                    • If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

                      – Andrei Gheorghiu
                      Nov 14 '18 at 22:20











                    • @AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

                      – Temani Afif
                      Nov 14 '18 at 22:29

















                    • While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

                      – Andrei Gheorghiu
                      Nov 14 '18 at 22:11











                    • @AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

                      – Temani Afif
                      Nov 14 '18 at 22:17











                    • If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

                      – Andrei Gheorghiu
                      Nov 14 '18 at 22:20











                    • @AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

                      – Temani Afif
                      Nov 14 '18 at 22:29
















                    While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

                    – Andrei Gheorghiu
                    Nov 14 '18 at 22:11





                    While in principle you're right, I find setting the height to 0 less robust in the open, as it sometimes reflows contents. You also have the disadvantage of having to "remember" the height and animate towards it. Negative margin seems to be a more reliable solution, IMHO. No reflow and you always animate towards 0, regardless of height.

                    – Andrei Gheorghiu
                    Nov 14 '18 at 22:11













                    @AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

                    – Temani Afif
                    Nov 14 '18 at 22:17





                    @AndreiGheorghiu I was thinking pure CSS and forget at the end that we are using JS and we have the flexibility to get different value like height, etc ... I thought about the margin animation but didn't find the CSS solution of it.

                    – Temani Afif
                    Nov 14 '18 at 22:17













                    If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

                    – Andrei Gheorghiu
                    Nov 14 '18 at 22:20





                    If the height is variable you can't make a solution with CSS alone. In order to animate max-height smoothly you'd need to animate it towards the height value. Otherwise it will either jump or not animate for the entire time (when you animate max-height past height, the element doesn't change).

                    – Andrei Gheorghiu
                    Nov 14 '18 at 22:20













                    @AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

                    – Temani Afif
                    Nov 14 '18 at 22:29





                    @AndreiGheorghiu yes that's why the only CSS solution is to consider a value big enough to be sure it will also be toward height which is easy in this case since the container has a fixed height and the notification are small.

                    – Temani Afif
                    Nov 14 '18 at 22:29

















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