选择单选后,在vue.js version2上更改图像src

时间:2018-07-07 17:27:21

标签: javascript vue.js vuejs2

我想更改图像,然后触发图像更新。

例如 http://jsbin.com/kuluyike/3/edit?html,js,output

  <div id="colorPicker">
    <img v-attr="src:color" alt="{{color}}">
    <ul>
      <li v-repeat="colors">
        <label>
          <input type="radio" id="{{name}}" name="color" v-model="color" value="{{image}}">
          {{name}}
        </label>
      </li>
    </ul>
  </div>


  var cp = new Vue({
    el: '#colorPicker',

    data: {
      colors: [
        {
          name: 'red',
          image: 'red.jpg'
        },
        {
          name: 'pink',
          image: 'pink.jpg'
        },
        {
          name: 'blue',
          image: 'blue.jpg'
        }
      ]
    }
  });

但这不适用于Vue.js 2.x版

如何更改代码,以便基于2.x版本工作

2 个答案:

答案 0 :(得分:3)

Vue 2.0, the syntax has changed for attributes中,这意味着您现在必须声明以下属性:

<img :src="color" :alt="color">
<input type="radio" :id="name" :name="color" v-model="color" :value="image">

Vue 2.0, the syntax for loops has changed from v-repeat to v-for:中:

<li v-for="(colorInfo, index) in colors">
<input type="radio" :id="colorInfo.name" name="color" v-model="color" :value="colorInfo.image">

在Vue 2.0开发模式下,访问未声明的属性时会发出警告

data: {
    // ...
    color: undefined,
},

var cp = new Vue({
    el: '#colorPicker',

    data: {
      color: undefined,
      colors: [
        {
          name: 'red',
          image: 'red.jpg'
        },
        {
          name: 'pink',
          image: 'pink.jpg'
        },
        {
          name: 'blue',
          image: 'blue.jpg'
        }
      ]
    }
  });
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>


<div id="colorPicker">
    <img :src="color" :alt="color">
    <ul>
      <li v-for="(colorInfo, index) in colors">
        <label>
          <input type="radio" :id="colorInfo.name" name="color" v-model="color" :value="colorInfo.image">
          {{colorInfo.name}}
        </label>
      </li>
    </ul>
  </div>

另请参阅:Migration from Vue 1.x - Vuejs

答案 1 :(得分:2)

您可以在此处使用v-for在Vue 2.x中进行循环,例如:

new Vue({
  el: '#colorPicker',
  data: {
    color: null,
    colors: [{
        name: 'red',
        image: 'red.jpg'
      },
      {
        name: 'pink',
        image: 'pink.jpg'
      },
      {
        name: 'blue',
        image: 'blue.jpg'
      }
    ]
  }
});
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
<div id="colorPicker">
  <img :src="color" :alt="color" v-if="color" />
  <ul>
    <li v-for="c in colors">
      <label>
          <input type="radio" name="color" v-model="color" :value="c.image"/>
          {{c.name}}
        </label>
    </li>
  </ul>
  <p v-if="color"><b>Selected image name: </b> {{color}}</p>
</div>