Vue <component> 元素

示例

使用内置 <component> 元素和 is 属性来创建动态组件。

<template>
  <h1>Dynamic Components</h1>
  <p>App.vue switches between which component to show.</p>
  <button @click="toggleValue = !toggleValue">Switch component</button>
  <component :is="activeComp"></component>
</template>

示例 1

使用内置的 <component> 元素创建 <div> 元素。

<template>
  <h2>Example Built-in 'component' Element</h2>
  <p>The component element is rendered as a div element with is="div":</p>
  <component is="div">This is a DIV element</component>
</template>

<style scoped>
div {
  border: solid black 1px;
  background-color: lightgreen;
}
</style>

示例 2

使用内置的 <component> 元素在有序列表和无序列表之间切换。

<template>
  <h2>Example Built-in 'component' Element</h2>
  <p>Using the component element to toggle between an ordered list (ol), and an unordered list (ul):</p>
  <button v-on:click="toggleValue = !toggleValue">Toggle</button>
  <p>Animals from around the world</p>
  <component :is="tagType">
    <li>Kiwi</li>
    <li>Jaguar</li>
    <li>Bison</li>
    <li>Snow Leopard</li>
  </component>
</template>

<script>
export default {
  data() {
    return {
      toggleValue: true
    }
  },
  computed: {
    tagType() {
      if (this.toggleValue) {
        return 'ol'
      }
      else {
        return 'ul'
      }
    }
  }
}
</script>

示例 3

通过向 is 属性提供组件名称，使用内置 <component> 元素来呈现组件。

App.vue:

<template>
  <h2>Example Built-in 'is' Attribute</h2>
  <p>The component element below is set to be a component by the use of 'is="child-comp"'.</p>
  <component is="child-comp"></component>
</template>

ChildComp.vue:

<template>
  <div>
    <h3>ChildComp.vue</h3>
    <p>This is the child component</p>
  </div>
</template>

<style scoped>
div {
  border: solid black 1px;
  background-color: lightgreen;
  padding: 10px;
  max-width: 250px;
  margin-top: 20px;
}
</style>

示例 4

使用内置的 <component> 元素创建动态组件，我们可以在两个组件之间切换。

<template>
  <h1>Dynamic Components</h1>
  <p>App.vue switches between which component to show.</p>
  <button @click="toggleValue = !toggleValue">Switch component</button>
  <component :is="activeComp"></component>
</template>

<script>
  export default {
    data () {
      return {
        toggleValue: true
      }
    },
    computed: {
      activeComp() {
        if(this.toggleValue) {
          return 'comp-one'
        }
        else {
          return 'comp-two'
        }
      }
    }
  }
</script>

<style>
  #app {
    width: 350px;
    margin: 10px;
  }
  #app > div {
    border: solid black 2px;
    padding: 10px;
    margin-top: 10px;
  }
</style>

示例 5

内置 <KeepAlive> 组件用于 <component> 元素周围，以便在组件之间切换时记住输入。

<template>
  <h1>Dynamic Components</h1>
  <p>App.vue switches between which component to show.</p>
  <p>With the <KeepAlive> tag the components now remember the user inputs.</p>
  <button @click="toggleValue = !toggleValue">Switch component</button>
  <KeepAlive>
    <component :is="activeComp"></component>
  </KeepAlive>
</template>

<script>
  export default {
    data () {
      return {
        toggleValue: true
      }
    },
    computed: {
      activeComp() {
        if(this.toggleValue) {
          return 'comp-one'
        }
        else {
          return 'comp-two'
        }
      }
    }
  }
</script>

<style>
  #app {
    width: 350px;
    margin: 10px;
  }
  #app > div {
    border: solid black 2px;
    padding: 10px;
    margin-top: 10px;
  }
  h2 {
    text-decoration: underline;
  }
</style>

示例 6

使用 <component> 元素与 is 属性和三元表达式来切换哪个组件应处于活动状态。

<template>
  <h1>Dynamic Components</h1>
  <p>Refresh the page and there is a chance the dynamic component will toggle.</p>
  <component :is="Math.random() > 0.5 ? 'comp-one' : 'comp-two'"></component>
</template>

<style>
  #app {
    width: 350px;
    margin: 10px;
  }
  #app > div {
    border: solid black 2px;
    padding: 10px;
    margin-top: 10px;
  }
</style>