VueJS如何更新选择数据 [英] VueJS how to update data on selection

问题描述

在VueJS 2.0中，我想在选择更改时使用v-for指令更新项目的呈现。

In a VueJS 2.0 I want to update the rendering of items using a v-for directive when a selection changes.

html：

<main>
 {{ testvalue }}
  <select v-model="selected.name">
    <option v-for="foo in foobar">{{foo.name}}</option>
  </select>
  <span>Selected: {{ selected.name }}</span>
  <div v-for="(value, key) in selected.properties">
    <p>{{ key }} {{ value }}</p>
  </div>
</main>

app.js

new Vue({
    el: 'main',
    data: {
        foobar: [
      { name: 'rex', type: 'dog', properties: [{color: 'red', sound: 'load'}] },
      { name: 'tike', type: 'cat', properties: [{color: 'brown', sound: 'quiet'}] }, 
      { name: 'tiny', type, 'mouse', properties: [{color: 'white', sound: 'quiet'}]}
      ],
      selected: { name: 'tiny', type, 'mouse', properties: [{color: 'white', sound: 'quiet'}]},
      testvalue: 'Test'
    },
    created: function () {
        this.selected = this.foobar[0];
    },
    mounted: function () {
        this.selected = this.foobar[1];
    }
})

jsfiddle here：< a href =https://jsfiddle.net/doritonimo/u1n8x97e/ =nofollow noreferrer> https://jsfiddle.net/doritonimo/u1n8x97e/

jsfiddle here: https://jsfiddle.net/doritonimo/u1n8x97e/

当所选对象从更改中获取数据时，v-for指令不会更新。当Vue中的数据发生变化时，有没有办法告诉v-for循环更新？

The v-for directive does not update when the selected object it is getting it's data from changes. Is there a way to tell the v-for loop to update when data changes in Vue?

推荐答案

你的小提琴仍然包含一些拼写错误所以它不起作用。

You fiddle still contains some typo so it doesn't work.

请检查： https://jsfiddle.net/u1n8x97e/39/

您无需存储整个选定对象。您可以保留索引。

You don't need to store the entire selected object. You can just keep the index.

<select v-model="selected">
  <option v-for="(foo, i) in foobar" :value="i">{{foo.name}}</option>
</select>

现在已选择只是一个数字：

selected: 0

并且您通过 foobar [selected]

这篇关于VueJS如何更新选择数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！