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Filter treeview nodes in JavaScript (ES5) TreeView control

You can filter the tree nodes based on their text using the DataManager plugin and the fields property of the TreeView.

The following code example demonstrates how to filter the tree nodes in a TreeView.

Source
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index.js
index.html
index.css
ej.base.enableRipple(true);

   var localData = [
        { id: 1, name: "Australia", hasChild: true },
        { id: 2, pid: 1, name: "New South Wales" },
        { id: 3, pid: 1, name: "Victoria" },
        { id: 4, pid: 1, name: "South Australia" },
        { id: 6, pid: 1, name: "Western Australia" },
        { id: 7, name: "Brazil", hasChild: true },
        { id: 8, pid: 7, name: "Paraná" },
        { id: 9, pid: 7, name: "Ceará" },
        { id: 10, pid: 7, name: "Acre" },
        { id: 11, name: "China", hasChild: true },
        { id: 12, pid: 11, name: "Guangzhou" },
        { id: 13, pid: 11, name: "Shanghai" },
        { id: 14, pid: 11, name: "Beijing" },
        { id: 15, pid: 11, name: "Shantou" },
        { id: 16, name: "France", hasChild: true },
        { id: 17, pid: 16, name: "Pays de la Loire" },
        { id: 18, pid: 16, name: "Aquitaine" },
        { id: 19, pid: 16, name: "Brittany" },
        { id: 20, pid: 16, name: "Lorraine" },
        { id: 21, name: "India", hasChild: true },
        { id: 22, pid: 21, name: "Assam" },
        { id: 23, pid: 21, name: "Bihar" },
        { id: 24, pid: 21, name: "Tamil Nadu" },
        { id: 25, pid: 21, name: "Punjab" }
];

// Render the TreeView with list data source
var listTreeObj = new ej.navigations.TreeView({
  fields: { dataSource: localData, id: 'id', parentID: 'pid', text: 'name', hasChildren: 'hasChild' },
});
listTreeObj.appendTo('#treeView');

//Render the MaskedTextBox input element
var mask = new ej.inputs.MaskedTextBox({
  placeholder: "Enter the tree node to search",
  change: searchNodes
});
mask.appendTo('#mask');

//Change the dataSource for TreeView
function changeDataSource(data) {
  listTreeObj.fields = {
    dataSource: data, id: 'id', text: 'name',
    parentID: 'pid', hasChildren: 'hasChild'
  }
}

//Filtering the TreeNodes
function searchNodes(args) {
  var _text = mask.element.value;
  var predicats = [], _array = [], _filter = [];
  if (_text == "") {
    changeDataSource(localData);
  }
  else {
    var predicate = new ej.data.Predicate('name', 'contains', _text, true);
    var filteredList = new ej.data.DataManager(localData).executeLocal(new ej.data.Query().where(predicate));
    for (var j = 0; j < filteredList.length; j++) {
      _filter.push(filteredList[j]["id"]);
      var filters = getFilterItems(filteredList[j], localData);
      for (var i = 0; i < filters.length; i++) {
        if (_array.indexOf(filters[i]) == -1 && filters[i] != null) {
          _array.push(filters[i]);
          predicats.push(new ej.data.Predicate('id', 'equal', filters[i], false));
        }
      }
    }
    if (predicats.length == 0) {
      changeDataSource([]);
    } else {
      var query = new ej.data.Query().where(new ej.data.Predicate.or(predicats));
      var newList = new ej.data.DataManager(localData).executeLocal(query);
      changeDataSource(newList);
      setTimeout(function () {
        listTreeObj.expandAll();
      }, 400);
    }
  }
}

//Find the Parent Nodes for corresponding childs
function getFilterItems(fList, list) {
  var nodes = [];
  nodes.push(fList["id"]);
  var query2 = new ej.data.Query().where('id', 'equal', fList["pid"], false);
  var fList1 = new ej.data.DataManager(list).executeLocal(query2);
  if (fList1.length != 0) {
    var pNode = getFilterItems(fList1[0], list);
    for (var i = 0; i < pNode.length; i++) {
      if (nodes.indexOf(pNode[i]) == -1 && pNode[i] != null)
        nodes.push(pNode[i]);
    }
    return nodes;
  }
  return nodes;
}
<html lang="en"><head><script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head><body>&#xFEFF;



    <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="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet">
    
    



    
    <div id="container">
    <div style="margin: 20px; padding: 20px; height: 2000px;">
			<div class="treeviewfilter">
				<!-- TextBox Element -->
				<input id="mask" type="text">
				<!-- TreeView Element -->
				<div id="treeView"></div>
			</div>
		</div>
    </div>
    <style>
        .treeviewfilter {
			width: 200px;
			min-height: 300px;
			max-height: auto;
			border: 1px solid #bbbbbb;
			margin: 0 auto;
		}

		.e-mask .e-input {
			border: none;
			border-bottom: 1px solid #bbbbbb;
		}

		.heading {
			font-size: 22px;
			margin: 0 auto;
			width: 300px;
			margin-bottom: 10px;
		}
    </style>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>
.treeviewfilter {
    width: 300px;
	min-height: 250px;
	max-height: auto;
	border: 1px solid #bbbbbb;
	margin: 0 auto;
}
.e-mask .e-input {
	border: none;
	border-bottom: 1px solid #bbbbbb;
}