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

 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>

Please share your reply to handle this problem.

Answer 1

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 (works in 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>

And here's a version that works in Vue 3 (custom directives have different syntax, 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>

Answer 2

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.

Answer 3

<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 4

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");   
  }
}