javascript - Select2 on change 事件在 Vuejs 中不起作用

Question

我在 vuejs 中使用 select2，我发现 vuejs 不能使用 jquery select2，因为 vuejs 使用的是 navite html。

我正在使用这段代码

Vue.directive('select', {
        twoWay: true,
        bind: function () {
            $(this.el).select2()
            .on("select2:select", function(e) {
                this.set($(this.el).val());
            }.bind(this));
            },
        update: function(nv, ov) {
            $(this.el).trigger("change");
        }
    });
    var app = new Vue({
      el: '#app',
      data: {
        supplier_id: "niklesh"
      }
    })
    $('#supplier_id').select2({});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.1.4/vue.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.5/css/bootstrap.css">
<div id="app">
  {{ supplier_id }}

<select id="supplier_id" class='form-control' v-model='supplier_id' v-select='supplier_id'>
    <option value="atul">Atul</option>
    <option value="niklesh">Niklesh</option>
    <option value="sachin">Sachin</option>
</select>

</div>

请分享您的回复以处理此问题。

Answer 1

要让它与指令一起工作，我们需要了解 v-model 的工作原理。来自docs :

<input v-model="something">

is just syntactic sugar for:

<input v-bind:value="something" v-on:input="something = $event.target.value">

在选择元素的情况下，v-model 将监听 change 事件(不是 input)。因此，如果指令在元素更改时分派(dispatch) change 事件，则 v-model 将按预期工作。

这是您的代码的更新版本(适用于 Vue 2):

Vue.directive('select', {
  twoWay: true,
  bind: function (el, binding, vnode) {
    $(el).select2().on("select2:select", (e) => {
      // v-model looks for
      //  - an event named "change"
      //  - a value with property path "$event.target.value"
      el.dispatchEvent(new Event('change', { target: e.target }));
    });
  },
  componentUpdated: function(el, me) {
    // update the selection if the value is changed externally
    $(el).trigger("change");
  }
});
var app = new Vue({
  el: '#app',
  data: {
    supplier_id: "niklesh"
  },
})
$('#supplier_id').select2({});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.1.4/vue.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.5/css/bootstrap.css">
<div id="app">
  {{ supplier_id }}

  <select id="supplier_id" class='form-control' v-model='supplier_id' v-select='supplier_id'>
    <option value="atul">Atul</option>
    <option value="niklesh">Niklesh</option>
    <option value="sachin">Sachin</option>
  </select>

</div>

这是一个适用于 Vue 3 的版本(自定义指令具有不同的语法，linked here):

var app = Vue.createApp({
  data: function() { 
    return {
      supplier_id: "niklesh"
    }
  }
})

app.directive('select', {
  beforeMount: function (el, binding, vnode) {
    $(el).select2().on("select2:select", (e) => {
      // v-model looks for
      //  - an event named "change"
      //  - a value with property path "$event.target.value"
      el.dispatchEvent(new Event('change', { target: e.target }));
    });
  },
    updated: function(el) {
    // update the selection if the value is changed externally
    $(el).trigger("change");
  }
});

app.mount('#app');

$('#supplier_id').select2({});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.js"></script>
<script src="https://unpkg.com/vue@3.0.11"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.5/css/bootstrap.css">
<div id="app">
  {{ supplier_id }}

  <select id="supplier_id" class='form-control' v-model='supplier_id' v-select='supplier_id'>
    <option value="atul">Atul</option>
    <option value="niklesh">Niklesh</option>
    <option value="sachin">Sachin</option>
  </select>

</div>