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Data Binding

The DropDownList loads the data either from local data sources or remote data services using the dataSource property. It supports the data type of array or DataManager.

The DropDownList also supports different kinds of data services such as OData, OData V4, and Web API, and data formats such as XML, JSON, and JSONP with the help of DataManager adaptors.

Fields Type Description
text string Specifies the display text of each list item.
value number or string Specifies the hidden data value mapped to each list item that should contain a unique value.
groupBy string Specifies the category under which the list item has to be grouped.
iconCss string Specifies the icon class of each list item.

When binding complex data to the DropDownList, fields should be mapped correctly. Otherwise, the selected item remains undefined.

Binding local data

Local data can be represented in two ways as described below.

1. Array of simple data

The DropDownList has support to load array of primitive data such as strings and numbers. Here, both value and text field act the same.

Source
Preview
app.vue
<template>
  <div id="app">
    <div id='container' style="margin:50px auto 0; width:250px;">
        <br>
        <ejs-dropdownlist id='dropdownlist' :dataSource='sportsData' placeholder='Select a game'></ejs-dropdownlist>
    </div>
  </div>
</template>
<script>
import Vue from 'vue';
import { DropDownListPlugin } from "@syncfusion/ej2-vue-dropdowns";
Vue.use(DropDownListPlugin);
export default {
  data (){
    return {
      sportsData: ['Badminton', 'Cricket', 'Football', 'Golf', 'Tennis'];
    }
  }
}

</script>
<style>
@import "../../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-vue-inputs/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-vue-dropdowns/styles/material.css";
</style>

2. Array of JSON data

The DropDownList can generate its list items through an array of complex data. For this, the appropriate columns should be mapped to the fields property.

In the following example, Id column and Game column from complex data have been mapped to the value field and text field, respectively.

Source
Preview
app.vue
<template>
  <div id="app">
    <div id='container' style="margin:50px auto 0; width:250px;">
        <br>
        <ejs-dropdownlist id='dropdownlist' placeholder='Select a game' :dataSource='sportsData' :fields='fields'></ejs-dropdownlist>
    </div>
  </div>
</template>
<script>
import Vue from 'vue';
import { DropDownListPlugin } from "@syncfusion/ej2-vue-dropdowns";
Vue.use(DropDownListPlugin);

export default {
  data (){
    return {
        sportsData: [
          { Id: 'game1', Game: 'Badminton' },
          { Id: 'game2', Game: 'Football' },
          { Id: 'game3', Game: 'Tennis' }
        ],
        fields: { text: 'Game', value: 'Id' },
    }
  }
}

</script>
<style>
@import "../../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-vue-inputs/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-vue-dropdowns/styles/material.css";
</style>

3. Array of Complex data

The DropDownList can generate its list items through an array of complex data. For this, the appropriate columns should be mapped to the fields property.

In the following example, Code.Id column and Country.Name column from complex data have been mapped to the value field and text field, respectively.

Source
Preview
app.vue
<template>
  <div id="app">
    <div id='container' style="margin:50px auto 0; width:250px;">
        <br>
        <ejs-dropdownlist id='dropdownlist' placeholder='Select a country' :dataSource='countriesData' :fields='fields'></ejs-dropdownlist>
    </div>
  </div>
</template>
<script>
import Vue from 'vue';
import { DropDownListPlugin } from "@syncfusion/ej2-vue-dropdowns";
Vue.use(DropDownListPlugin);

export default {
  data (){
    return {
        countriesData :  [
          { Country: { Name: 'Australia' }, Code: { Id: 'AU' }},
          { Country: { Name: 'Bermuda' },Code: { Id: 'BM' }},
          { Country:{ Name: 'Canada'}, Code:{ Id: 'CA'} },
          { Country:{Name: 'Cameroon'}, Code:{ Id: 'CM'} },
          { Country:{Name: 'Denmark'}, Code:{ Id: 'DK' }},
          { Country:{Name: 'France'}, Code: { Id:'FR'} }
        ],
        fields: { text: 'Country.Name', value: 'Code.Id' }
    }
  }
}

</script>
<style>
@import "../../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-vue-inputs/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-vue-dropdowns/styles/material.css";
</style>

Binding remote data

The DropDownList supports retrieval of data from remote data services with the help of DataManager component. The Query property is used to fetch data from the database and bind it to the DropDownList.

The following sample displays the first 6 contacts from “Customers” table of the Northwind Data Service.

Source
Preview
app.vue
<template>
  <div id="app">
    <div id='container' style="margin:50px auto 0; width:250px;">
        <br>
        <ejs-dropdownlist id='dropdownlist' placeholder='Select a customer' sortOrder='Ascending' :dataSource='dataSource' :query='query' :fields='fields'></ejs-dropdownlist>
    </div>
  </div>
</template>
<script>
import Vue from 'vue';
import { DropDownListPlugin } from "@syncfusion/ej2-vue-dropdowns";
Vue.use(DropDownListPlugin);
import { DataManager,Query,ODataV4Adaptor } from "@syncfusion/ej2-data";
export default {
  data (){
    return {
        query :  new Query().from('Customers').select(['ContactName', 'CustomerID']).take(6),
        dataSource : new DataManager({
          url: 'http://services.odata.org/V4/Northwind/Northwind.svc/',
          adaptor: new ODataV4Adaptor,
          crossDomain: true
          }),
        fields: { text: 'ContactName', value: 'CustomerID' }
    }
  }
}

</script>
<style>
@import "../../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-vue-inputs/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-vue-dropdowns/styles/material.css";
</style>
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