Filtering tree nodes in React Treeview component
30 Jan 202323 minutes to read
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.
import * as ReactDOM from 'react-dom';
import * as React from 'react';
import { DataManager, Query, Predicate } from '@syncfusion/ej2-data';
import { MaskedTextBoxComponent } from "@syncfusion/ej2-react-inputs";
import { TreeViewComponent } from '@syncfusion/ej2-react-navigations';
function App() {
// list data source for TreeView component
let 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" }
];
// Mapping TreeView fields property with data source properties
let field = { dataSource: localData, id: 'id', parentID: 'pid', text: 'name', hasChildren: 'hasChild', expanded: "expanded" };
let treeObj;
let maskObj;
//Change the dataSource for TreeView
function changeDataSource(data) {
treeObj.fields = {
dataSource: data, id: 'id', text: 'name', parentID: 'pid', hasChildren: 'hasChild'
};
}
//Filtering the TreeNodes
function searchNodes(args) {
let _text = maskObj.element.value;
let predicats = [], _array = [], _filter = [];
if (_text == "") {
changeDataSource(localData);
}
else {
let predicate = new Predicate('name', 'startswith', _text, true);
let filteredList = new DataManager(localData).executeLocal(new Query().where(predicate));
console.log(filteredList);
for (let j = 0; j < filteredList.length; j++) {
_filter.push(filteredList[j]["id"]);
let filters = getFilterItems(filteredList[j], localData);
for (let i = 0; i < filters.length; i++) {
if (_array.indexOf(filters[i]) == -1 && filters[i] != null) {
_array.push(filters[i]);
predicats.push(new Predicate('id', 'equal', filters[i], false));
}
}
}
if (predicats.length == 0) {
changeDataSource([]);
}
else {
let query = new Query().where(Predicate.or(predicats));
let newList = new DataManager(localData).executeLocal(query);
changeDataSource(newList);
let proxy = treeObj;
setTimeout(function () {
proxy.expandAll();
}, 100);
}
}
}
//Find the Parent Nodes for corresponding childs
function getFilterItems(fList, list) {
let nodes = [];
nodes.push(fList["id"]);
let query2 = new Query().where('id', 'equal', fList["pid"], false);
let fList1 = new DataManager(list).executeLocal(query2);
if (fList1.length != 0) {
let pNode = getFilterItems(fList1[0], list);
for (let i = 0; i < pNode.length; i++) {
if (nodes.indexOf(pNode[i]) == -1 && pNode[i] != null)
nodes.push(pNode[i]);
}
return nodes;
}
return nodes;
}
return (<div className='control-pane'>
<div className='control-section'>
<div className='control_wrapper'>
<MaskedTextBoxComponent ref={(mask) => { maskObj = mask; }} change={searchNodes.bind(this)}/>
{/* Render TreeView */}
<TreeViewComponent fields={field} ref={(treeview) => { treeObj = treeview; }}/>
</div>
</div>
</div>);
}
export default App;
ReactDOM.render(<App />, document.getElementById('sample'));import * as ReactDOM from 'react-dom';
import * as React from 'react';
import { DataManager, Query, ReturnOption, Predicate } from '@syncfusion/ej2-data';
import { MaskedTextBoxComponent, ChangeEventArgs} from "@syncfusion/ej2-react-inputs";
import {TreeViewComponent} from '@syncfusion/ej2-react-navigations';
function App() {
// list data source for TreeView component
let localData: { [key: string]: Object }[] = [
{ 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" }
];
// Mapping TreeView fields property with data source properties
let field:Object = { dataSource: localData, id: 'id', parentID: 'pid', text: 'name', hasChildren: 'hasChild', expanded: "expanded" }
let treeObj: TreeViewComponent;
let maskObj: MaskedTextBoxComponent;
//Change the dataSource for TreeView
function changeDataSource(data: any) {
treeObj.fields = {
dataSource: data, id: 'id', text: 'name',parentID: 'pid', hasChildren: 'hasChild'
}
}
//Filtering the TreeNodes
function searchNodes(args: ChangeEventArgs) {
let _text = maskObj.element.value;
let predicats = [], _array = [], _filter = [];
if (_text == "") {
changeDataSource(localData);
}
else {
let predicate = new Predicate('name', 'startswith', _text, true);
let filteredList : any = new DataManager(localData).executeLocal(new Query().where(predicate));
console.log(filteredList)
for (let j = 0; j < filteredList.length; j++) {
_filter.push(filteredList[j]["id"]);
let filters = getFilterItems(filteredList[j], localData);
for (let i = 0; i < filters.length; i++) {
if (_array.indexOf(filters[i]) == -1 && filters[i] != null) {
_array.push(filters[i]);
predicats.push(new Predicate('id', 'equal', filters[i], false));
}
}
}
if (predicats.length == 0) {
changeDataSource([]);
} else {
let query = new Query().where(Predicate.or(predicats));
let newList : any =new DataManager(localData).executeLocal(query);
changeDataSource(newList);
let proxy: any = treeObj as TreeViewComponent;
setTimeout(function (this: any) {
proxy.expandAll();
}, 100);
}
}
}
//Find the Parent Nodes for corresponding childs
function getFilterItems(fList: any, list: any): any {
let nodes = [];
nodes.push(fList["id"]);
let query2 = new Query().where('id', 'equal', fList["pid"], false);
let fList1 = new DataManager(list).executeLocal(query2);
if (fList1.length != 0) {
let pNode:any= getFilterItems(fList1[0], list);
for (let i = 0; i < pNode.length; i++) {
if (nodes.indexOf(pNode[i]) == -1 && pNode[i] != null)
nodes.push(pNode[i]);
}
return nodes;
}
return nodes;
}
return (
<div className = 'control-pane'>
<div className='control-section'>
<div className='control_wrapper'>
<MaskedTextBoxComponent ref={(mask) => { maskObj = mask as MaskedTextBoxComponent; }} change={searchNodes.bind(this)} />
{/* Render TreeView */}
<TreeViewComponent fields={field} ref={(treeview) => { treeObj = treeview as TreeViewComponent; }}/>
</div>
</div>
</div>
)
}
export default App;
ReactDOM.render(<App />, document.getElementById('sample'));