How to remove tags in vue

With the continuous development of web front-end technology, Vue.js has become one of the preferred frameworks for more and more front-end engineers. When we use Vue.js, we often encounter scenarios where we need to dynamically add and delete tags. So how do we operate tags in Vue.js? This article will share with you how to remove tags in Vue.js.

1. Use v-if/v-else-if/v-else instructions to control the rendering of tags

Vue.js provides v-if, v-else-if and With these three instructions v-else, we can use these instructions to control the rendering of labels. The v-if directive determines whether to render an element based on the true or false value of the expression, while the v-else-if and v-else directives determine whether to render an element based on the true or false value of the expression when the conditions of the v-if directive are not met. to decide whether to render an element. The sample code is as follows:

<template>
  <div>
    <h1 v-if="flag === 'a'">这是标签A</h1>
    <h1 v-else-if="flag === 'b'">这是标签B</h1>
    <h1 v-else>这是标签C</h1>
  </div>
</template>

<script>
export default {
  data () {
    return {
      flag: 'a'
    }
  }
}
</script>

In the above sample code, we define a flag variable, and then control the display of different labels based on the different values ​​of the flag variable. When the flag is 'a', only the h1 tag is displayed, and the text "This is label A" is displayed; when the flag is 'b', only the h1 tag is displayed, and the text "This is label B" is displayed; when the flag is not When 'a' or 'b' is used, only the h1 tag is displayed, and the text "This is tag C" is displayed.

2. Use the v-for instruction to loop through rendering tags

In addition to the above method, Vue.js also provides a very convenient instruction-v-for, through v-for Instructions allow us to easily loop through rendering tags. An example is as follows:

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

<script>
export default {
  data () {
    return {
      list: ['标签A', '标签B', '标签C']
    }
  }
}
</script>

In the above example code, we define a list array, and then use the v-for instruction to loop through the array and render the li tag. Since the v-for directive will generate a set of the same tags, we need to set a unique key attribute for each tag generated by the loop so that Vue.js can track each tag.

3. Use slot-scope for slot rendering

If you need to dynamically render data into different tags, we can use the slot mechanism of Vue.js. In Vue.js, slots are something like placeholders that can help us insert data into custom components. The sample code is as follows:

<template>
  <div>
    <tag-list>
      <template slot-scope="props">
        <h1 v-if="props.flag === 'a'">{{ props.text }}</h1>
        <h2 v-else-if="props.flag === 'b'">{{ props.text }}</h2>
        <h3 v-else>{{ props.text }}</h3>
      </template>
    </tag-list>
  </div>
</template>

<script>
export default {
  components: {
    'tag-list': {
      data () {
        return {
          list: [
            { flag: 'a', text: '这是标签A' },
            { flag: 'b', text: '这是标签B' },
            { flag: 'c', text: '这是标签C' }
          ]
        }
      },
      template: `
        <ul>
          <li v-for="(item, index) in list" :key="index">
            <slot :text="item.text" :flag="item.flag"></slot>
          </li>
        </ul>
      `
    }
  }
}
</script>

In the above sample code, we define a tag-list component, which uses the v-for instruction to loop through rendering li tags. Then, a slot is used inside the li tag, the data of the slot content is obtained through the slot-scope instruction, and different tags are dynamically rendered according to different values ​​of the data. In this way, we can easily render labels dynamically through the slot mechanism.

Summary

In this article, we shared 3 ways to remove tags in Vue.js, including using v-if/v-else-if/v-else instructions, using v- for directive and using slot-scope for slot rendering. Different methods are suitable for different scenarios, and you need to choose according to the specific situation when using them. At the same time, we also need to pay attention to the reasonable use of instructions and features provided by Vue.js, so that we can better leverage the advantages of Vue.js and improve development efficiency.

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