Vue 的“ref”属性

示例

使用 ref 属性更改 <p> 标签内的文本

示例

<ul>
  <li v-for="x in liTexts" ref="liEl">{{ x }}</li>
</ul>

示例 1

更改 <p> 元素内的文本。

<template>
  <h1>Example</h1>
  <p>Click the button to put "Hello!" as the text in the green p element.</p>
  <button @click="changeVal">Change Text</button><br>
  <p ref="pEl" id="pEl">This is the initial text</p>
</template>

<script>
  export default {
    methods: {
      changeVal() { 
        this.$refs.pEl.innerHTML = "Hello!";
      }
    }
  };
</script>

<style>
#pEl {
  background-color: lightgreen;
  display: inline-block;
}
</style>

示例 2

第一个 <p> 标签的文本被复制到第二个 <p> 标签中。

<template>
  <h1>Example</h1>
  <p ref="p1">Click the button to copy this text into the paragraph below.</p>
  <button @click="transferText">Transfer text</button>
  <p ref="p2">...</p>
</template>

<script>
  export default {
    methods: {
      transferText() { 
        this.$refs.p2.innerHTML = this.$refs.p1.innerHTML;
      }
    }
  };
</script>

示例 3

<p> 元素获取与输入字段中写入的内容相同的內容。

<template>
  <h1>Example</h1>
  <p>Start writing inside the input element, and the text will be copied into the last paragraph by the use of the '$refs' object.</p>
  <input ref="inputEl" @input="getRefs" placeholder="Write something..">
  <p ref="pEl"></p>
</template>

<script>
  export default {
    methods: {
      getRefs() { 
        this.$refs.pEl.innerHTML = this.$refs.inputEl.value;
      }
    }
  };
</script>

示例 4

该按钮显示存储在 $refs 对象中的数组元素内的第三个列表元素。

<template>
  <h1>Example</h1>
  <p>Click the button to reveal the 3rd list element stored as an array element in the $refs object.</p>
  <button @click="getValue">Get the 3rd list element</button><br>
  <ul>
    <li v-for="x in liTexts" ref="liEl">{{ x }}</li>
  </ul>
  <pre>{{ thirdEl }}</pre>
</template>

<script>
  export default {
    data() {
      return {
        thirdEl: ' ',
        liTexts: ['Apple','Banana','Kiwi','Tomato','Lichi']
      }
    },
    methods: {
      getValue() { 
        this.thirdEl = this.$refs.liEl[2].innerHTML;
        console.log("this.$refs.liEl = ",this.$refs.liEl);
      }
    }
  };
</script>

<style>
pre {
  background-color: lightgreen;
  display: inline-block;
}
</style>