What attributes are used to obtain dom elements in vue

You can obtain a reference to a DOM element through the ref attribute in Vue. The specific steps are as follows: define a reference variable and add it to the ref attribute of the DOM element to be referenced. Use the $refs object in the mounted hook to access DOM elements. Note: Reference variables must be defined before the component is instantiated, DOM elements can only be accessed in the mounted hook, and the $refs object is read-only.

Get the DOM element through the ref attribute

In Vue, you can use the ref attribute Get a reference to a DOM element. Obtain the DOM element through the following steps:

1. Define a reference variable

In the Vue instance or component, define a variable used to store the DOM element reference, for example :

export default {
  mounted() {
    this.myElementRef = null;
  }
};

2. Add the ref attribute to the DOM element

In the template, add the ref attribute to To get the referenced DOM element and set the value to the defined reference variable:

<div ref="myElementRef"></div>

3. Access the element in the mounted hook

In mounted In the hook, you can use the $refs object to access the DOM element:

export default {
  mounted() {
    const myElement = this.$refs.myElementRef;
    // 现在可以对 myElement 进行操作
  }
};

When using the ref attribute, you need to pay attention to the following points:

• Reference variables must be defined before component instantiation.
• DOM elements must be accessed in a mounted hook, since references to DOM elements may not be available before that hook.
• $refs The object is read-only and cannot be modified directly.

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