Is vue's ref a dom operation?

Vue is one of the more popular front-end frameworks currently. Its two-way data binding, componentization and other features have changed the way front-end development is done. During the development process of Vue, the DOM can be easily manipulated using the ref attribute.

So, is Vue's ref a DOM operation? This article will explore this issue from the perspectives of Vue's ref attribute and how to use it, as well as the relationship between DOM operations and ref.

1. Vue’s ref attribute

ref is one of the core attributes of Vue. It is used to register a DOM element or component in a Vue instance. We can use the ref attribute to locate DOM elements in Vue components, so that we can easily manipulate the DOM.

The format of using the ref attribute in the Vue template is as follows:

<template>
  <div>
    <h3 ref="title">这是一个标题</h3>
  </div>
</template>

In the above code, we use the ref attribute to register a title element, whose key value is "title". Then we can get this DOM element through $this.$refs.title of the Vue instance.

2. How to use the ref attribute

1. Using ref on the component

We can use the ref attribute on the component, which is convenient Manipulate the DOM elements in this component.

For example, we have the following component:

<template>
  <div>
    <h3 ref="title">这是一个标题</h3>
    <p>这是一段正文</p>
  </div>
</template>

Use the ref attribute to get this DOM element through this.$refs.title in the component.

2. Use ref on ordinary DOM elements

The ref attribute can also be used on ordinary DOM elements, for example:

<template>
  <div ref="box">
    <h3>这是一个标题</h3>
    <p>这是一个段落</p>
  </div>
</template>

Use the ref attribute to pass the component Get this DOM element from this.$refs.box.

3. Used in v-for

When using the v-for directive, we can also use the ref attribute, for example:

<template>
  <ul>
    <li v-for="(item, index) in list" ref="list-item">{{ index }}：{{ item }}</li>
  </ul>
</template>

The above code , the ref attribute is used to register each list-item element, which facilitates subsequent operations on them.

3. The relationship between DOM operations and ref attributes

DOM operations refer to operations such as adding, deleting, modifying, and checking elements on the page, such as changing the text and style of elements. , location, etc. We can implement DOM operations through JavaScript, but it is more troublesome to write this way.

The ref attribute of Vue allows us to easily obtain DOM elements, allowing us to perform DOM operations more conveniently. For example, we can get the DOM element registered with the ref attribute in the component's mounted hook function and perform some operations, such as changing the text content, adding CSS styles, etc.

<script>
export default {
  data() {
    return {
      content: "这是一个段落"
    };
  },
  mounted() {
    this.$refs.title.innerText = "新标题";
    this.$refs.paragraph.style.color = "red";
  }
};
</script>

<template>
  <div>
    <h3 ref="title">这是一个标题</h3>
    <p ref="paragraph">{{ content }}</p>
  </div>
</template>

In the above code, we obtained the DOM elements registered with the ref attribute in the mounted hook function of the component, and modified their text content and CSS styles respectively.

Therefore, Vue's ref attribute can be said to be part of the DOM operation, which allows us to operate the DOM more conveniently. Of course, when using Vue's ref attribute, you also need to be careful not to abuse it, otherwise the code may become less readable and the code maintenance will be more difficult.

4. Summary

Vue’s ref attribute is part of DOM operations. It allows us to easily obtain DOM elements and perform some operations. In Vue component development, the ref attribute is a very commonly used attribute, which helps improve development efficiency. However, when using Vue's ref attribute, you also need to pay attention to its usage to avoid abuse.

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