更改事件上的 Select2 在 Vuejs 中不起作用

Question

我在 vuejs 中使用 select2 ，我发现 vuejs 无法使用 jquery select2 ，因为 vuejs 正在使用 navite html。

我正在使用此代码

 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

为了让它与指令一起工作，我们需要了解v-model是如何工作的。 从文档：

 <input v-model="something">

只是语法糖：

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

在 select 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调度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>

这是适用于 Vue 3 的版本（自定义指令有不同的语法， 链接在这里）：

 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

通过将 select2 值分配给 vuejs 数据，我能够解决这个问题。 我在这里没有使用自定义指令。

 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>

如果这不是好方法或您建议的任何更好的解决方案，请发表评论。

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

尝试在您的选择控件中添加v-on:change="onChange"

HTML 模板

<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”是您的方法的名称

JavaScript

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