The usage and function of $refs in vue

$refs in Vue.js can access DOM nodes or subcomponent instances of elements inside the component. Its usage includes: accessing DOM elements, you can directly obtain the DOM node of the element through ref. To access the subcomponent instance, you can obtain the instance object of the subcomponent through ref. To access multiple DOM elements, a set of DOM elements can be accessed through the $refs array. The advantage of $refs is that it can directly access the DOM, realize component communication, and perform dynamic control. However, it should be noted that it is only available after the component is mounted and will not be automatically updated. Overuse may lead to increased coupling.

The usage and role of $refs in Vue

$refs# in Vue.js ## is a special attribute that allows access to the DOM nodes of elements inside the component. It provides the following usage:

1. Access DOM element

<code class="vue"><template>
  <div ref="myElement"></div>
</template>

<script>
  export default {
    mounted() {
      console.log(this.$refs.myElement); // 访问 DOM 元素
    }
  }
</script></code>

2. Access child component instance

<code class="vue"><template>
  <MyComponent ref="myComponent"></MyComponent>
</template>

<script>
  export default {
    mounted() {
      console.log(this.$refs.myComponent); // 访问子组件实例
    }
  }
</script></code>

3. Access multiple DOM elements

To access multiple DOM elements, you can use

$refs Array:

<code class="vue"><template>
  <div ref="myElements"></div>
</template>

<script>
  export default {
    mounted() {
      console.log(this.$refs.myElements); // 访问 DOM 元素数组
    }
  }
</script></code>

Advantages:

• Direct access to DOM: Similar to getElementById or querySelector, provides a concise way to access DOM elements .
• Component communication: Allows parent components to access DOM elements or instances of child components to achieve communication between components.
• Dynamic control: Can be used to dynamically add, delete or modify DOM elements.

Note:

can only be used after the component is mounted
• $refs.
• $refs will not be updated automatically and needs to be updated manually if the DOM elements change.
It is not recommended to overuse
• $refs because it may lead to increased code coupling.

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