admin管理员组文章数量:1341690
In JSX it's possible to bind multiple events to a DOM element like this:
<input {...inputEvents}>
In Svelte, this is done manually.
<input on:input={inputHandler}>
This bees tedious when you need to add multiple handlers (input, blur, focus) to multiple inputs of a form.
The only way I've found to solve this in Svelte is by using refs.
For example:
<input bind:this={myInput}>
And then somewhere either do this:
myInput.oninput = (event) => {
// do something
}
Or:
myInput.addEventListener('click', (event) => {
// do something
})
Is there a better way to bind events dynamically in Svelte?
In JSX it's possible to bind multiple events to a DOM element like this:
<input {...inputEvents}>
In Svelte, this is done manually.
<input on:input={inputHandler}>
This bees tedious when you need to add multiple handlers (input, blur, focus) to multiple inputs of a form.
The only way I've found to solve this in Svelte is by using refs.
For example:
<input bind:this={myInput}>
And then somewhere either do this:
myInput.oninput = (event) => {
// do something
}
Or:
myInput.addEventListener('click', (event) => {
// do something
})
Is there a better way to bind events dynamically in Svelte?
Share Improve this question edited Mar 1, 2024 at 11:52 Samuel RIGAUD 1,6861 gold badge17 silver badges27 bronze badges asked Mar 30, 2020 at 16:01 PierPier 10.8k17 gold badges72 silver badges118 bronze badges 10- 1 Unfortunately, there isn't :( I've came to learn that sveltejs is much less dynamic than expected to be... Your solution is probably the best way. – Chagai Wild Commented Mar 30, 2020 at 16:05
-
5
focusinandfocusoutbubble whilefocusandblurdo not (Focus Events). Have you considered attaching handlers only on the form element and using the Event.target to route the processing, potentially leaving element specific data in custom data attributes? – Peer Reynders Commented Mar 30, 2020 at 20:01 -
7
Kind of a workaround, but you could use a
use:action. Example: svelte.dev/repl/6d70347b8b164ce9a0216ca859713655?version=3.20.1 – joshnuss Commented Mar 30, 2020 at 21:27 - Hey @PeerReynders that's a great idea! – Pier Commented Mar 30, 2020 at 21:29
- 1 GH issue: github./sveltejs/svelte/issues/5112 – Connor Low Commented May 27, 2021 at 18:46
2 Answers
Reset to default 9If you need to attach the same or similar set of event handlers to various elements then you can use "actions" with use:action (ref: https://svelte.dev/docs#template-syntax-element-directives-use-action )
Here is an example:
<script>
function manyHandlers(element){
element.addEventListener("click", ev => {...})
element.addEventListener("focus", ev => {...})
element.addEventListener("blur", ev => {...})
...
}
</script>
<form>
<input use:manyHandlers>
<textarea use:manyHandlers></textarea>
<!-- and so on... -->
</form>
You can pass additional parameters to the function specified in the use:___, for example to control which set of event handlers get attached. See the above mentioned documentation reference on how that works.
Also, as mentioned in the ments, you can take advantage of event bubbling and attach the event handler to a parent element (eg: the <form> element in the above example) and use the event.target to do specific handlings with the element that received the event.
You can use $: before the input handler.
<script>
let myInput = "";
$: {
// Do something with myInput
}
</script>
<body>
<input type="text" bind:value={myInput}>
</body>
It's important to use the "myInput" variable in the eventHandler because it reacts to the state of the variables, used in the function. Also you should bind "value" not "this".
本文标签： javascriptHow to bind events dynamically in SvelteStack Overflow
版权声明：本文标题：javascript - How to bind events dynamically in Svelte? - Stack Overflow 内容由网友自发贡献，该文观点仅代表作者本人， 转载请联系作者并注明出处：http://www.betaflare.com/web/1743661464a2518022.html， 本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容，一经查实，本站将立刻删除。
发表评论