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

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>

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.7k74774

asked Nov 14 '18 at 21:05

Syn

645

add a comment |

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/

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>

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.7k74774

asked Nov 14 '18 at 21:05

Syn

645

add a comment |

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/

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>

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.7k74774

asked Nov 14 '18 at 21:05

Syn

645

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/

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

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.7k74774

asked Nov 14 '18 at 21:05

Syn

645

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.7k74774

asked Nov 14 '18 at 21:05

Syn

645

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.7k74774

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.7k74774

edited Nov 14 '18 at 23:20

Andrei Gheorghiu

35.7k74774

asked Nov 14 '18 at 21:05

Syn

645

asked Nov 14 '18 at 21:05

Syn

645

asked Nov 14 '18 at 21:05

Syn

645

add a comment |

2 Answers
2

active

oldest

votes

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>

edited Nov 14 '18 at 22:48

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.7k74774

add a comment |

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>

answered Nov 14 '18 at 21:41

Temani Afif

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

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2 Answers
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2 Answers
2

active

oldest

votes

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>

edited Nov 14 '18 at 22:48

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.7k74774

add a comment |

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>

edited Nov 14 '18 at 22:48

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.7k74774

add a comment |

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>

edited Nov 14 '18 at 22:48

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.7k74774

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>

edited Nov 14 '18 at 22:48

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.7k74774

edited Nov 14 '18 at 22:48

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.7k74774

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.7k74774

answered Nov 14 '18 at 22:06

Andrei Gheorghiu

35.7k74774

add a comment |

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>

answered Nov 14 '18 at 21:41

Temani Afif

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

add a comment |

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>

answered Nov 14 '18 at 21:41

Temani Afif

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

add a comment |

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>

answered Nov 14 '18 at 21:41

Temani Afif

75.6k94386

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>

answered Nov 14 '18 at 21:41

Temani Afif

75.6k94386

answered Nov 14 '18 at 21:41

Temani Afif

75.6k94386

answered Nov 14 '18 at 21:41

Temani Afif

75.6k94386

answered Nov 14 '18 at 21:41

Temani Afif

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

add a comment |

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

add a comment |

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