What does ref mean in vue

The ref directive in Vue is used to obtain a reference to an element or component, and can access DOM elements or component instances to operate or control them. Usage: Use the ref directive, such as

; access the reference through this.$refs, such as this.$refs.myElement returns the DOM element, this.$refs.myComponent returns the component Example. Scenarios include: direct access to DOM elements, interacting with subcomponents, form input binding, and creating custom directives.

The meaning of ref in Vue

In Vue.js, ref is a directive used to get elements or a reference to a component. By using ref, you can access DOM elements or component instances and manipulate or control them outside of the component.

Usage

ref The directive can be applied to any element or component with the following syntax:

<code class="html"><template>
  <div ref="myElement"></div>
  <my-component ref="myComponent"></my-component>
</template></code>

Access Reference

Accessref References can be realized through this.$refs objects:

<code class="javascript">export default {
  mounted() {
    console.log(this.$refs.myElement);  // 返回 DOM 元素
    console.log(this.$refs.myComponent);  // 返回组件实例
  }
}</code>

Uses

ref Mainly used in the following scenarios:

• Direct access to DOM elements: You can obtain the reference of the DOM element through $refs to directly operate the DOM.
• Interacting with subcomponents: You can obtain the reference of the subcomponent through $refs to call the method of the subcomponent or access the properties of the subcomponent.
• Form input binding: Using ref on a form input element provides access to the element's native DOM node for custom input validation or formatting.
• Create custom directives: ref can be used to create custom directives to extend the functionality of Vue.

Note

• ref is related to the life cycle of the Vue instance and can only be accessed after the component is mounted.
• ref Unique values ​​should be specified in the template to avoid conflicts with other references.
• For functional components, ref cannot get the component instance, only the DOM element.

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