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Detailed explanation of vue2.x two-way binding encapsulation

php中世界最好的语言Original: 2018-04-17 16:10:001641browse

This time I will bring you a detailed explanation of vue2.x two-way binding encapsulation. What are the precautions for vue2.x two-way binding encapsulation? Here are practical cases, let’s take a look.

Code:

<!DOCTYPE html>
<html>
<head>
  <title>vue select2 封装</title>
  <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css" rel="external nofollow" rel="stylesheet" />
  <script src="https://unpkg.com/vue/dist/vue.js"></script>
  <script src="https://cdn.bootcss.com/jquery/2.2.4/jquery.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script>
  <style type="text/css">
    .content{
      text-align: center;
      padding:50px;
    }
    .content *{
      text-align: left;
    }
    .select{
      width: 350px;
    }
  </style>
</head>
<body>
  <p class="content" id="vue-example">
    <select class="select" v-select2=&#39;options&#39; v-model="selectValue"></select>
    <br/>
    <span>结果：{{ selectValue }}</span>
  </p>
</body>
<script type="text/javascript">
  Vue.directive('select2', {
   inserted: function (el, binding, vnode) {
     let options = binding.value || {};
 
    $(el).select2(options).on("select2:select", (e) => {
     // v-model looks for
     // - an event named "change"
     // - a value with property path "$event.target.value"
       el.dispatchEvent(new Event('change', { target: e.target })); //说好的双向绑定，竟然不安套路
    });
   },
   update: function(el, binding, vnode) {
    $(el).trigger("change");
   }
  });
 
  var vueApp = new Vue({
   el: "#vue-example",
   data: {
    selectValue: '你还没有选值',
    options: {
      data: [
          { id: 0, text: 'enhancement' },
        { id: 1, text: 'bug' },
        { id: 2, text: 'duplicate' },
        { id: 3, text: 'invalid' },
        { id: 4, text: 'wontfix' }
      ]
    }
   }
  });
</script>
</html>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

Detailed explanation of vue2.x two-way binding encapsulation

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