Remote data bind in Vue Drop down list component

11 Jun 20246 minutes to read

Before component rendering, you can get the total items count by using actionComplete  event with its result arguments.

After rendering this component, you can get the total items count by using getItems method.

The following example demonstrate how to get the total items count.

Composition API (~/src/App.vue)

<template>
  <div id="app">
    <div id='container' style="margin:50px auto 0; width:250px;">
      <br>
      <ejs-dropdownlist id='dropdownlist' ref='dropdown' placeholder='Select a customer'
        :actionComplete='actionComplete' :dataSource='dataSource' :query='query' :fields='fields'></ejs-dropdownlist>
    </div>
    <div style='padding: 50px 0'>
      <button id='first' class="e-control e-btn" v-on:click="getItems"> Get items</button>
    </div>
    <p id='event'> </p>
  </div>
</template>
<script setup>
import { ref } from "vue";
import { DropDownListComponent as EjsDropdownlist } from "@syncfusion/ej2-vue-dropdowns";
import { DataManager, Query, ODataV4Adaptor } from "@syncfusion/ej2-data";

const dropdown = ref(null);
const query = new Query().from('Customers').select(['ContactName', 'CustomerID']).take(6);
const dataSource = new DataManager({
  url: 'https://services.odata.org/V4/Northwind/Northwind.svc/',
  adaptor: new ODataV4Adaptor,
  crossDomain: true
});
const fields = { text: 'ContactName', value: 'CustomerID' };

const actionComplete = function (e) {
  // initially result contains 6 items
  console.log("Before modified the result: " + e.result.length);
  // remove first 2 items from result.
  e.result.splice(0, 2);
  // now displays the result count is 4.
  console.log("After modified the result: " + e.result.length);
};
const getItems = function (e) {
  // get items count using getItems method
  console.log("Total items count: " + dropdown.value.getItems().length);
  let element = document.createElement('p');
  element.innerText = "Total items count: " + dropdown.value.getItems().length;
  document.getElementById('event').append(element);
};

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

Options API (~/src/App.vue)

<template>
  <div id="app">
    <div id='container' style="margin:50px auto 0; width:250px;">
      <br>
      <ejs-dropdownlist id='dropdownlist' ref='dropdown' placeholder='Select a customer'
        :actionComplete='actionComplete' :dataSource='dataSource' :query='query' :fields='fields'></ejs-dropdownlist>
    </div>
    <div style='padding: 50px 0'>
      <button id='first' class="e-control e-btn" v-on:click="getItems"> Get items</button>
    </div>
    <p id='event'> </p>
  </div>
</template>
<script>
import { DropDownListComponent } from "@syncfusion/ej2-vue-dropdowns";
import { DataManager, Query, ODataV4Adaptor } from "@syncfusion/ej2-data";

export default {
  name: "App",
  components: {
    "ejs-dropdownlist": DropDownListComponent
  },
  data() {
    return {
      query: new Query().from('Customers').select(['ContactName', 'CustomerID']).take(6),
      dataSource: new DataManager({
        url: 'https://services.odata.org/V4/Northwind/Northwind.svc/',
        adaptor: new ODataV4Adaptor,
        crossDomain: true
      }),
      fields: { text: 'ContactName', value: 'CustomerID' }
    }
  },
  methods: {
    actionComplete: function (e) {
      // initially result contains 6 items
      console.log("Before modified the result: " + e.result.length);
      // remove first 2 items from result.
      e.result.splice(0, 2);
      // now displays the result count is 4.
      console.log("After modified the result: " + e.result.length);
    },
    getItems: function (e) {
      // get items count using getItems method
      console.log("Total items count: " + this.$refs.dropdown.getItems().length);
      var element = document.createElement('p');
      element.innerText = "Total items count: " + this.$refs.dropdown.getItems().length;
      document.getElementById('event').append(element);
    }
  }
}
</script>
<style>
@import "../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../node_modules/@syncfusion/ej2-inputs/styles/material.css";
@import "../node_modules/@syncfusion/ej2-vue-dropdowns/styles/material.css";
</style>