Utilizing vanilla JavaScript's addEventListener in a Vue component

Question

Utilizing vanilla JavaScript's addEventListener in a Vue component

It appears that vanilla event listeners do not function properly when targeting DOM elements within Vue components.

Code Snippet

<p id="test1">Hover over this (works)</p>
<div id="app">
    <p id="test2">Hover over this (not working)</p>
</div>

JavaScript

document.querySelector('#test1').addEventListener('mouseover', function() {
    alert("HOVER1")
})

document.querySelector('#test2').addEventListener('mouseover', function() {
    alert("HOVER2")
})

new Vue({
    el: "#app"
})

Live Example

View live example here

Is this behavior intentional? Are there any other restrictions when mixing vanilla JavaScript with Vue?

javascript vue.js

Answer 1

Answer №1

It appears that the example using alert("HOVER2") is not functioning as expected due to Vue's dynamic rendering of content. When your script loads, the element you are trying to add the event listener to may not exist yet.

To make it work, consider moving your code to the mounted hook:

new Vue({
  el: "#app",
  mounted() {
    document.querySelector('#test2').addEventListener('click', function() { alert("HOVER2") })
  }
})

Alternatively, you can utilize a workaround by placing your querySelector within a setTimeout(() => ..., 0) function, which will delay its execution until all other queued tasks are completed:

setTimeout(() => document.querySelector('#test2').addEventListener('click', function() { alert("HOVER2") }), 0);

It is recommended to utilize Vue's built-in event handling system and avoid direct DOM manipulations. Vue manages its virtual DOM and updates it accordingly, so using Vue's event handlers is preferred over direct DOM manipulation to ensure consistency and prevent issues.

Answer 2

It appears that the example using alert("HOVER2") is not functioning as expected due to Vue's dynamic rendering of content. When your script loads, the element you are trying to add the event listener to may not exist yet.

To make it work, consider moving your code to the mounted hook:

new Vue({
  el: "#app",
  mounted() {
    document.querySelector('#test2').addEventListener('click', function() { alert("HOVER2") })
  }
})

Alternatively, you can utilize a workaround by placing your querySelector within a setTimeout(() => ..., 0) function, which will delay its execution until all other queued tasks are completed:

setTimeout(() => document.querySelector('#test2').addEventListener('click', function() { alert("HOVER2") }), 0);

It is recommended to utilize Vue's built-in event handling system and avoid direct DOM manipulations. Vue manages its virtual DOM and updates it accordingly, so using Vue's event handlers is preferred over direct DOM manipulation to ensure consistency and prevent issues.

Utilizing vanilla JavaScript's addEventListener in a Vue component

Code Snippet

JavaScript

Live Example

Answer №1

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