Get all child nodes in EJ2 JavaScript TreeView control

28 Jan 20258 minutes to read

This section demonstrates how to retrieve child nodes from a corresponding parent ID within the TreeView control. By using the getNode method, you can obtain the node details of the TreeView. Please refer to the following example.

/**
* TreeView get child nodes from parent id sample
*/

// Hierarchical data source for TreeView control
var data = [
    {
        code: "AF", name: "Africa", countries: [
            { code: "NGA", name: "Nigeria" },
            { code: "EGY", name: "Egypt" },
            { code: "ZAF", name: "South Africa" }
        ]
    },
    {
        code: "AS", name: "Asia", countries: [
            { code: "CHN", name: "China" },
            {
                code: "IND", name: "India", countries: [
                    { code: "TN", name: "TamilNadu" }
                ]
            },
            { code: "JPN", name: "Japan" }
        ]
    },
    {
        code: "EU", name: "Europe", countries: [
            { code: "DNK", name: "Denmark" },
            { code: "FIN", name: "Finland" },
            { code: "AUT", name: "Austria" }
        ]
    },
    {
        code: "NA", name: "North America", countries: [
            { code: "USA", name: "United States of America" },
            { code: "CUB", name: "Cuba" },
            { code: "MEX", name: "Mexico" }
        ]
    },
    {
        code: "SA", name: "South America", countries: [
            { code: "BR", name: "Brazil" },
            { code: "COL", name: "Colombia" },
            { code: "ARG", name: "Argentina" }
        ]
    },

];
var tree1 = new ej.navigations.TreeView({
    fields: { dataSource: data, id: 'code', text: 'name', child: 'countries' },
    loadOnDemand: false,
    created: onCreate
});
tree1.appendTo('#tree');
function onCreate() {
    var proxy = this;
    document.getElementById("btn").addEventListener("click", function () {
        var id = document.getElementById('Nodes').value;
        var element = proxy.element.querySelector('[data-uid="' + id + '"]');
        // Gets the child Element
        var liElements = element.querySelectorAll('ul li');
        var arr = [];
        for (var i = 0; i < liElements.length; i++) {
            var nodeData = proxy.getNode(liElements[i]);
            arr.push(nodeData);
        }
        alert(JSON.stringify(arr));
    })
}
<!DOCTYPE html>
<html lang="en">

<head>
  <title>Essential JS 2 for TreeView </title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="description" content="Essential JS 2 for TreeView UI Control">
  <meta name="author" content="Syncfusion">
  <link href="index.css" rel="stylesheet">
  <link href="https://cdn.syncfusion.com/ej2/31.1.17/ej2-base/styles/material.css" rel="stylesheet">
  <link href="https://cdn.syncfusion.com/ej2/31.1.17/ej2-inputs/styles/material.css" rel="stylesheet">
  <link href="https://cdn.syncfusion.com/ej2/31.1.17/ej2-navigations/styles/material.css" rel="stylesheet">
  <script src="https://cdn.syncfusion.com/ej2/31.1.17/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">
    <div id="treeparent">
      <div id="tree"></div>
    </div>
    <br>
    <input type="text" class="e-input" id="Nodes" style="margin-left: 300px; width: 175px;"
      placeholder="Enter the parent ID( Ex: AS)">
    <input type="button" class="btn btn-primary" value="Submit" id="btn">
    <br>
  </div>

  <script>
    var ele = document.getElementById('container');
    if (ele) {
      ele.style.visibility = "visible";
    }   
  </script>
  <script src="index.js" type="text/javascript"></script>
  <style>
    #treeparent {
      display: block;
      max-width: 350px;
      max-height: 350px;
      margin: auto;
      overflow: auto;
      border: 1px solid #dddddd;
      border-radius: 3px;
    }
  </style>
</body>

</html>
#container {
  visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  width: 30%;
  position: absolute;
  font-family: 'Helvetica Neue', 'calibiri';
  font-size: 14px;
  top: 45%;
  left: 45%;
}