Sorting treeview level wise in React Treeview component
30 Jan 202316 minutes to read
You can sort the TreeView nodes based on their level. When using the sortOrder property, the whole TreeView is sorted. When you sort a particular level, you can use the following code sample. The following code sample demonstrates how to sort the parent node alone in TreeView.
import * as ReactDOM from 'react-dom';
import * as React from 'react';
import { TreeViewComponent } from '@syncfusion/ej2-react-navigations';
import { enableRipple } from '@syncfusion/ej2-base';
import { DataManager, Query } from '@syncfusion/ej2-data';
enableRipple(true);
function App() {
// Data source for TreeView component
let Countries = [
{ id: 1, name: 'India', hasChild: true },
{ id: 2, pid: 1, name: 'Assam' },
{ id: 3, pid: 1, name: 'Bihar' },
{ id: 4, pid: 1, name: 'Tamil Nadu' },
{ id: 6, pid: 1, name: 'Punjab' },
{ 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: 'France', hasChild: true },
{ id: 12, pid: 11, name: 'Pays de la Loire' },
{ id: 13, pid: 11, name: 'Aquitaine' },
{ id: 14, pid: 11, name: 'Brittany' },
{ id: 15, pid: 11, name: 'Lorraine' },
{ id: 16, name: 'Australia', hasChild: true },
{ id: 17, pid: 16, name: 'New South Wales' },
{ id: 18, pid: 16, name: 'Victoria' },
{ id: 19, pid: 16, name: 'South Australia' },
{ id: 20, pid: 16, name: 'Western Australia' },
{ id: 21, name: 'China', hasChild: true },
{ id: 22, pid: 21, name: 'Guangzhou' },
{ id: 23, pid: 21, name: 'Shanghai' },
{ id: 24, pid: 21, name: 'Beijing' },
{ id: 25, pid: 21, name: 'Shantou' }
];
let field = { dataSource: Countries, id: 'id', text: 'name', parentID: 'pid', hasChildren: 'hasChild' };
let newData;
let treeObj;
function onNodeExpand(args) {
if (args.isInteracted && args.node.querySelector('li') === null) {
let id = parseInt(args.node.getAttribute("data-uid"));
let childData = new DataManager(newData).executeLocal(new Query().where(treeObj.fields.parentID, 'equal', id, false));
treeObj.addNodes(childData, args.node, null);
}
}
function onCreate() {
newData = treeObj.fields.dataSource;
// Selects the first level nodes alone
let resultData = new DataManager(treeObj.getTreeData()).executeLocal(new Query().where(treeObj.fields.parentID, 'equal', undefined, false));
let name = [];
for (let i = 0; i < resultData.length; i++) {
name.push(resultData[i][treeObj.fields.text]);
}
name.sort();
let arr = [];
for (let j = 0; j < name.length; j++) {
let sortedData = new DataManager(treeObj.getTreeData()).executeLocal(new Query().where(treeObj.fields.text, 'equal', name[j], false));
let childData = new DataManager(newData).executeLocal(new Query().where(treeObj.fields.parentID, 'equal', parseInt(sortedData[0][treeObj.fields.id]), false));
arr.push(sortedData[0]);
}
// Renders treeview with sorted Nodes
changeDataSource(arr);
treeObj.dataBind();
}
function changeDataSource(data) {
treeObj.fields = {
dataSource: data, id: 'id', text: 'name', parentID: 'pid', hasChildren: 'hasChild'
};
}
return (<div className='control-pane'>
<div className='control-section'>
<div className='control_wrapper'>
{/* Render TreeView */}
<TreeViewComponent fields={field} ref={(treeview) => { treeObj = treeview; }} created={onCreate.bind(this)} nodeExpanding={onNodeExpand.bind(this)}/>
</div>
</div>
</div>);
}
export default App;
ReactDOM.render(<App />, document.getElementById('sample'));import * as ReactDOM from 'react-dom';
import * as React from 'react';
import {TreeViewComponent, NodeExpandEventArgs } from '@syncfusion/ej2-react-navigations';
import {enableRipple} from '@syncfusion/ej2-base';
import { DataManager, Query } from '@syncfusion/ej2-data';
enableRipple(true);
function App() {
// Data source for TreeView component
let Countries: { [key: string]: Object }[]= [
{ id: 1, name: 'India', hasChild: true },
{ id: 2, pid: 1, name: 'Assam' },
{ id: 3, pid: 1, name: 'Bihar' },
{ id: 4, pid: 1, name: 'Tamil Nadu' },
{ id: 6, pid: 1, name: 'Punjab' },
{ 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: 'France', hasChild: true },
{ id: 12, pid: 11, name: 'Pays de la Loire' },
{ id: 13, pid: 11, name: 'Aquitaine' },
{ id: 14, pid: 11, name: 'Brittany' },
{ id: 15, pid: 11, name: 'Lorraine' },
{ id: 16, name: 'Australia', hasChild: true },
{ id: 17, pid: 16, name: 'New South Wales' },
{ id: 18, pid: 16, name: 'Victoria' },
{ id: 19, pid: 16, name: 'South Australia' },
{ id: 20, pid: 16, name: 'Western Australia' },
{ id: 21, name: 'China', hasChild: true },
{ id: 22, pid: 21, name: 'Guangzhou' },
{ id: 23, pid: 21, name: 'Shanghai' },
{ id: 24, pid: 21, name: 'Beijing' },
{ id: 25, pid: 21, name: 'Shantou' }
]
let field:Object ={ dataSource: Countries, id: 'id', text: 'name', parentID: 'pid', hasChildren: 'hasChild' };
let newData: any;
let treeObj: TreeViewComponent;
function onNodeExpand(args: NodeExpandEventArgs): void {
if (args.isInteracted && args.node.querySelector('li') === null){
let id: any = parseInt(args.node.getAttribute("data-uid"));
let childData: any = new DataManager(newData).executeLocal(new Query().where(treeObj.fields.parentID, 'equal', id, false));
treeObj.addNodes(childData, args.node,null)
}
}
function onCreate(){
newData = treeObj.fields.dataSource;
// Selects the first level nodes alone
let resultData = new DataManager(treeObj.getTreeData()).executeLocal(new Query().where(treeObj.fields.parentID, 'equal', undefined, false));
let name = [];
for (let i = 0; i < resultData.length; i++){
name.push(resultData[i][treeObj.fields.text]);
}
name.sort();
let arr = [];
for (let j = 0; j < name.length; j++) {
let sortedData = new DataManager(treeObj.getTreeData()).executeLocal(new Query().where(treeObj.fields.text, 'equal', name[j], false));
let childData = new DataManager(newData).executeLocal(new Query().where(treeObj.fields.parentID, 'equal', parseInt(sortedData[0][treeObj.fields.id]), false));
arr.push(sortedData[0]);
}
// Renders treeview with sorted Nodes
changeDataSource(arr);
treeObj.dataBind();
}
function changeDataSource(data: any){
treeObj.fields = {
dataSource: data, id: 'id', text: 'name', parentID: 'pid', hasChildren: 'hasChild'
}
}
return (
<div className = 'control-pane'>
<div className='control-section'>
<div className='control_wrapper'>
{/* Render TreeView */}
<TreeViewComponent fields={field} ref={(treeview) => { treeObj = treeview as TreeViewComponent; }} created={onCreate.bind(this)} nodeExpanding={onNodeExpand.bind(this)} />
</div>
</div>
</div>
)
}
export default App;
ReactDOM.render(<App />, document.getElementById('sample'));