Vuetify - 当模型更改时,如何使setSelectionRange(int,int)在v-textarea中工作

问题描述 投票:0回答:1

我尝试使用setSelectionRange方法在vuetify v-textarea中更改光标的位置。

当我不操纵textarea的v-model属性引用的数据元素时,它运行良好。但是,如果我先尝试更改身体,然后应用setSelectionRange方法;光标直接移动到文本的末尾。

我附上了一个简化版的片段。一旦你在textarea的任何地方点击退格键,光标就会移动到索引2;但它转移到文本的末尾。

但是,如果你再次删除this.body和退格键,它会平稳地移动到索引2。

new Vue({
  el: '#app',
  data: {
    body: ''
  },
  created () {
    this.body = 'I am initial body. Hit backspace on somewhere if you want!'
  },
  methods: {
    onBackspaceOrDeleteButtonKeydown (event) {
      // disable default behavior
      event.preventDefault()
      
      let bodyTextArea = this.$refs.pourBody.$el.querySelector('textarea')
      
      // COMMENT OUT THE NEXT LINE TO SEE THE CURSOR MOVES TO INDEX 2 ALWAYS
      this.body = 'I am changed body. My cursor should have moved to index 2 anyways, but it goes to the end like >'
      bodyTextArea.setSelectionRange(2, 2)
    }
  }
})
<!DOCTYPE html>
<html>

<head>
  <link href='https://fonts.googleapis.com/css?family=Roboto:300,400,500,700|Material+Icons' rel="stylesheet">
  <link href="https://cdn.jsdelivr.net/npm/vuetify/dist/vuetify.min.css" rel="stylesheet">
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no, minimal-ui">
</head>

<body>
  <div id="app">
    <v-app>
      <v-content>
        <v-container>
          <v-textarea 
            ref="pourBody"
            outline
            v-model="body"
            auto-grow rows="7"
            @keydown.delete="onBackspaceOrDeleteButtonKeydown"
          ></v-textarea>

        </v-container>
      </v-content>
    </v-app>
  </div>

  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
  <script src="https://cdn.jsdelivr.net/npm/vuetify/dist/vuetify.js"></script>
</body>

</html>

setSelectionRange显然不喜欢身体变化。

我该如何解决这个问题?

javascript html vue.js selection vuetify.js
1个回答
1
投票

将setSelectionRange包装到setTimeout中,就像这样setTimeout(() => bodyTextArea.setSelectionRange(2, 2))。将光标置于所需位置并重置光标位置后,v-model将重新渲染值。你必须确保你之后打电话给setSelectionRange

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