Modify data in EJ2 JavaScript Drop down list control

2 May 20233 minutes to read

When binding the remote data source, by using the actionComplete event, you can modify the result data before passing it to DropDownList.

The following sample demonstrate how to modify the result data.

var ddlObject = new ej.dropdowns.DropDownList({
    //bind the data manager instance to dataSource property
    dataSource: new ej.data.DataManager({
            url: 'https://services.odata.org/V4/Northwind/Northwind.svc/Customers',
            adaptor: new ej.data.ODataV4Adaptor(),
            crossDomain: true
    }),
    //bind the Query instance to query property
    query: new ej.data.Query().select(['ContactName']),
    //map the appropriate columns to fields property
    fields: { value: 'ContactName'},
    //set the placeholder to DropDownList input
    placeholder: "Find a customer",
     //sort the resulted items
    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);
    }
});

//render the component
ddlObject.appendTo('#ddlelement');
<!DOCTYPE html><html lang="en"><head>
    <title>Essential JS 2 DropDownList</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="styles.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/27.2.2/ej2-dropdowns/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/27.2.2/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container" style="margin:0 auto; width:250px;">
        <br>
        <input type="text" id="ddlelement">
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>