How to focus something on next render with React Hooks
I'm playing with hooks, and I'm trying to do the following:
import React, useState, useRef from 'react';
const EditableField = () =>
const [isEditing, setEditing] = useState(false);
const inputRef = useRef();
const toggleEditing = () =>
setEditing(!isEditing);
if (isEditing)
inputRef.current.focus();
;
return (
<>
isExpanded && <input ref=inputRef />
<button onClick=toggleEditing>Edit</button>
</>
);
;
This is going to fail, because current is null, since the component haven't re-rendered yet, and the input field is not yet rendered (and therefore can't be focused yet).
What is the right way to do this? I can use the usePrevious hook proposed in the React Hooks FAQ, but it seems like a painful workaround.
Is there a different way?
reactjs react-hooks
asked Nov 15 '18 at 8:05
Kris SelbekkKris Selbekk
3,61733053
add a comment |
I'm playing with hooks, and I'm trying to do the following:
import React, useState, useRef from 'react';
const EditableField = () =>
const [isEditing, setEditing] = useState(false);
const inputRef = useRef();
const toggleEditing = () =>
setEditing(!isEditing);
if (isEditing)
inputRef.current.focus();
;
return (
<>
isExpanded && <input ref=inputRef />
<button onClick=toggleEditing>Edit</button>
</>
);
;
This is going to fail, because current is null, since the component haven't re-rendered yet, and the input field is not yet rendered (and therefore can't be focused yet).
What is the right way to do this? I can use the usePrevious hook proposed in the React Hooks FAQ, but it seems like a painful workaround.
Is there a different way?
reactjs react-hooks
asked Nov 15 '18 at 8:05
Kris SelbekkKris Selbekk
3,61733053
add a comment |
I'm playing with hooks, and I'm trying to do the following:
import React, useState, useRef from 'react';
const EditableField = () =>
const [isEditing, setEditing] = useState(false);
const inputRef = useRef();
const toggleEditing = () =>
setEditing(!isEditing);
if (isEditing)
inputRef.current.focus();
;
return (
<>
isExpanded && <input ref=inputRef />
<button onClick=toggleEditing>Edit</button>
</>
);
;
This is going to fail, because current is null, since the component haven't re-rendered yet, and the input field is not yet rendered (and therefore can't be focused yet).
What is the right way to do this? I can use the usePrevious hook proposed in the React Hooks FAQ, but it seems like a painful workaround.
Is there a different way?
reactjs react-hooks
asked Nov 15 '18 at 8:05
Kris SelbekkKris Selbekk
3,61733053
I'm playing with hooks, and I'm trying to do the following:
import React, useState, useRef from 'react';
const EditableField = () =>
const [isEditing, setEditing] = useState(false);
const inputRef = useRef();
const toggleEditing = () =>
setEditing(!isEditing);
if (isEditing)
inputRef.current.focus();
;
return (
<>
isExpanded && <input ref=inputRef />
<button onClick=toggleEditing>Edit</button>
</>
);
;
This is going to fail, because current is null, since the component haven't re-rendered yet, and the input field is not yet rendered (and therefore can't be focused yet).
What is the right way to do this? I can use the usePrevious hook proposed in the React Hooks FAQ, but it seems like a painful workaround.
Is there a different way?
reactjs react-hooks
reactjs react-hooks
asked Nov 15 '18 at 8:05
Kris SelbekkKris Selbekk
3,61733053
asked Nov 15 '18 at 8:05
Kris SelbekkKris Selbekk
3,61733053
edited Nov 15 '18 at 9:21
Kris Selbekk
asked Nov 15 '18 at 8:05
Kris SelbekkKris Selbekk
3,61733053
asked Nov 15 '18 at 8:05
Kris SelbekkKris Selbekk
3,61733053
asked Nov 15 '18 at 8:05
Kris SelbekkKris Selbekk
3,61733053
3,61733053
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
You can use the useEffect hook to run a function after every render when isEditing changed. In this function you can check if isEditing is true and focus the input.
Example
const useState, useRef, useEffect = React;
const EditableField = () =>
const [isEditing, setEditing] = useState(false);
const inputRef = useRef();
const toggleEditing = () =>
setEditing(!isEditing);
;
useEffect(() =>
if (isEditing)
inputRef.current.focus();
, [isEditing]);
return (
<div>
isEditing && <input ref=inputRef />
<button onClick=toggleEditing>Edit</button>
</div>
);
;
ReactDOM.render(<EditableField />, document.getElementById("root"));<script src="https://unpkg.com/react@16.7.0-alpha.2/umd/react.production.min.js"></script>
<script src="https://unpkg.com/react-dom@16.7.0-alpha.2/umd/react-dom.production.min.js"></script>
<div id="root"></div>answered Nov 15 '18 at 8:55
TholleTholle
39k54265
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can use the useEffect hook to run a function after every render when isEditing changed. In this function you can check if isEditing is true and focus the input.
Example
const useState, useRef, useEffect = React;
const EditableField = () =>
const [isEditing, setEditing] = useState(false);
const inputRef = useRef();
const toggleEditing = () =>
setEditing(!isEditing);
;
useEffect(() =>
if (isEditing)
inputRef.current.focus();
, [isEditing]);
return (
<div>
isEditing && <input ref=inputRef />
<button onClick=toggleEditing>Edit</button>
</div>
);
;
ReactDOM.render(<EditableField />, document.getElementById("root"));<script src="https://unpkg.com/react@16.7.0-alpha.2/umd/react.production.min.js"></script>
<script src="https://unpkg.com/react-dom@16.7.0-alpha.2/umd/react-dom.production.min.js"></script>
<div id="root"></div>answered Nov 15 '18 at 8:55
TholleTholle
39k54265
add a comment |
You can use the useEffect hook to run a function after every render when isEditing changed. In this function you can check if isEditing is true and focus the input.
Example
const useState, useRef, useEffect = React;
const EditableField = () =>
const [isEditing, setEditing] = useState(false);
const inputRef = useRef();
const toggleEditing = () =>
setEditing(!isEditing);
;
useEffect(() =>
if (isEditing)
inputRef.current.focus();
, [isEditing]);
return (
<div>
isEditing && <input ref=inputRef />
<button onClick=toggleEditing>Edit</button>
</div>
);
;
ReactDOM.render(<EditableField />, document.getElementById("root"));<script src="https://unpkg.com/react@16.7.0-alpha.2/umd/react.production.min.js"></script>
<script src="https://unpkg.com/react-dom@16.7.0-alpha.2/umd/react-dom.production.min.js"></script>
<div id="root"></div>answered Nov 15 '18 at 8:55
TholleTholle
39k54265
add a comment |
You can use the useEffect hook to run a function after every render when isEditing changed. In this function you can check if isEditing is true and focus the input.
Example
const useState, useRef, useEffect = React;
const EditableField = () =>
const [isEditing, setEditing] = useState(false);
const inputRef = useRef();
const toggleEditing = () =>
setEditing(!isEditing);
;
useEffect(() =>
if (isEditing)
inputRef.current.focus();
, [isEditing]);
return (
<div>
isEditing && <input ref=inputRef />
<button onClick=toggleEditing>Edit</button>
</div>
);
;
ReactDOM.render(<EditableField />, document.getElementById("root"));<script src="https://unpkg.com/react@16.7.0-alpha.2/umd/react.production.min.js"></script>
<script src="https://unpkg.com/react-dom@16.7.0-alpha.2/umd/react-dom.production.min.js"></script>
<div id="root"></div>answered Nov 15 '18 at 8:55
TholleTholle
39k54265
You can use the useEffect hook to run a function after every render when isEditing changed. In this function you can check if isEditing is true and focus the input.
Example
const useState, useRef, useEffect = React;
const EditableField = () =>
const [isEditing, setEditing] = useState(false);
const inputRef = useRef();
const toggleEditing = () =>
setEditing(!isEditing);
;
useEffect(() =>
if (isEditing)
inputRef.current.focus();
, [isEditing]);
return (
<div>
isEditing && <input ref=inputRef />
<button onClick=toggleEditing>Edit</button>
</div>
);
;
ReactDOM.render(<EditableField />, document.getElementById("root"));<script src="https://unpkg.com/react@16.7.0-alpha.2/umd/react.production.min.js"></script>
<script src="https://unpkg.com/react-dom@16.7.0-alpha.2/umd/react-dom.production.min.js"></script>
<div id="root"></div>const useState, useRef, useEffect = React;
const EditableField = () =>
const [isEditing, setEditing] = useState(false);
const inputRef = useRef();
const toggleEditing = () =>
setEditing(!isEditing);
;
useEffect(() =>
if (isEditing)
inputRef.current.focus();
, [isEditing]);
return (
<div>
isEditing && <input ref=inputRef />
<button onClick=toggleEditing>Edit</button>
</div>
);
;
ReactDOM.render(<EditableField />, document.getElementById("root"));<script src="https://unpkg.com/react@16.7.0-alpha.2/umd/react.production.min.js"></script>
<script src="https://unpkg.com/react-dom@16.7.0-alpha.2/umd/react-dom.production.min.js"></script>
<div id="root"></div>const useState, useRef, useEffect = React;
const EditableField = () =>
const [isEditing, setEditing] = useState(false);
const inputRef = useRef();
const toggleEditing = () =>
setEditing(!isEditing);
;
useEffect(() =>
if (isEditing)
inputRef.current.focus();
, [isEditing]);
return (
<div>
isEditing && <input ref=inputRef />
<button onClick=toggleEditing>Edit</button>
</div>
);
;
ReactDOM.render(<EditableField />, document.getElementById("root"));<script src="https://unpkg.com/react@16.7.0-alpha.2/umd/react.production.min.js"></script>
<script src="https://unpkg.com/react-dom@16.7.0-alpha.2/umd/react-dom.production.min.js"></script>
<div id="root"></div>answered Nov 15 '18 at 8:55
TholleTholle
39k54265
answered Nov 15 '18 at 8:55
TholleTholle
39k54265
answered Nov 15 '18 at 8:55
TholleTholle
39k54265
answered Nov 15 '18 at 8:55
TholleTholle
39k54265
39k54265
add a comment |
add a comment |
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