Select2 on change event is not working in Vuejs

Question

I was working with select2 in vuejs , I found vuejs is not working with jquery select2 as vuejs is working with navite html.

I am using this code

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Answer 1

<select v-model="selected">
       <option value="1">1</option>
       <option value="2">2</option>
       <option value="3">3</option>
</select>


const self = this;
$("select").change(function () {
        const val = $(this).find("option:selected").val();
        self.selected = val;
 });

Answer 2

Try add v-on:change="onChange" in your select control

HTML template

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

"onChange" is the name of your method

JavaScript

methods: {
  onChange(e) {        
      alert("Change");   
  }
}

Answer 3

To get this to work with a directive, we need to understand how v-model works. From the docs:

<input v-model="something">

is just syntactic sugar for:

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

In the case of a select element, v-model will listen for the change event (not input). So, if the directive dispatches a change event when the element changes, then v-model will work as expected.

Here is an updated version of your code:

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 }));
    });
  },
});
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>

Answer 4

By assigning select2 value to vuejs data I am able to fix this problem. I didn't use custom directive here.

var app = new Vue({
  el: '#app',
  data: {
    supplier_id: "niklesh"
  },
  filters: {
    capitalize: function (value) {
      if (!value) return ''
      value = value.toString()
      return value.charAt(0).toUpperCase() + value.slice(1)
    }
  }
});

$('#supplier_id').on("change",function(){
    app.supplier_id = $(this).val();
    console.log('Name : '+$(this).val());
});

$('#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">
  Name : {{ supplier_id | capitalize }}
<select id="supplier_id" class='form-control' v-model='supplier_id'>
    <option value="atul">Atul</option>
    <option value="niklesh">Niklesh</option>
    <option value="sachin">Sachin</option>
</select>

</div>

Please comment if this is not good way or any better solution you suggest.