Validate the text when renaming the tree node in React Treeview component
30 Jan 202324 minutes to read
You can validate the tree node text while editing using nodeEdited event of the TreeView. Following is an example that shows how to validate and prevent empty values in tree node.
import * as ReactDOM from 'react-dom';
import * as React from 'react';
import { TreeViewComponent } from '@syncfusion/ej2-react-navigations';
import { enableRipple } from '@syncfusion/ej2-base';
enableRipple(true);
function App() {
let treeObj;
// Hierarchical data source for TreeView component
let hierarchicalData = [
{ id: '01', name: 'Local Disk (C:)', expanded: true,
subChild: [
{
id: '01-01', name: 'Program Files',
subChild: [
{ id: '01-01-01', name: 'Windows NT' },
{ id: '01-01-02', name: 'Windows Mail' },
{ id: '01-01-03', name: 'Windows Photo Viewer' },
]
},
{
id: '01-02', name: 'Users', expanded: true,
subChild: [
{ id: '01-02-01', name: 'Smith' },
{ id: '01-02-02', name: 'Public' },
{ id: '01-02-03', name: 'Admin' },
]
},
{
id: '01-03', name: 'Windows',
subChild: [
{ id: '01-03-01', name: 'Boot' },
{ id: '01-03-02', name: 'FileManager' },
{ id: '01-03-03', name: 'System32' },
]
},
]
},
{
id: '02', name: 'Local Disk (D:)',
subChild: [
{
id: '02-01', name: 'Personals',
subChild: [
{ id: '02-01-01', name: 'My photo.png' },
{ id: '02-01-02', name: 'Rental document.docx' },
{ id: '02-01-03', name: 'Pay slip.pdf' },
]
},
{
id: '02-02', name: 'Projects',
subChild: [
{ id: '02-02-01', name: 'ASP Application' },
{ id: '02-02-02', name: 'TypeScript Application' },
{ id: '02-02-03', name: 'React Application' },
]
},
{
id: '02-03', name: 'Office',
subChild: [
{ id: '02-03-01', name: 'Work details.docx' },
{ id: '02-03-02', name: 'Weekly report.docx' },
{ id: '02-03-03', name: 'Wish list.csv' },
]
},
]
},
{
id: '03', name: 'Local Disk (E:)', icon: 'folder',
subChild: [
{
id: '03-01', name: 'Pictures',
subChild: [
{ id: '03-01-01', name: 'Wind.jpg' },
{ id: '03-01-02', name: 'Stone.jpg' },
{ id: '03-01-03', name: 'Home.jpg' },
]
},
{
id: '03-02', name: 'Documents',
subChild: [
{ id: '03-02-01', name: 'Environment Pollution.docx' },
{ id: '03-02-02', name: 'Global Warming.ppt' },
{ id: '03-02-03', name: 'Social Network.pdf' },
]
},
{
id: '03-03', name: 'Study Materials',
subChild: [
{ id: '03-03-01', name: 'UI-Guide.pdf' },
{ id: '03-03-02', name: 'Tutorials.zip' },
{ id: '03-03-03', name: 'TypeScript.7z' },
]
},
]
}
];
let fields = { dataSource: hierarchicalData, id: 'id', text: 'name', child: 'subChild' };
let allowEditing = true;
function onNodeEdited(args) {
let displayContent = "";
if (args.newText.trim() == "") {
args.cancel = true;
displayContent = "TreeView item text should not be empty";
}
else if (args.newText != args.oldText) {
displayContent = "TreeView item text edited successfully";
}
else {
displayContent = "";
}
document.getElementById("display").innerHTML = displayContent;
}
return (<div className='control-pane'>
<div className='control-section'>
<div className='control_wrapper'>
{/* Render TreeView */}
<TreeViewComponent fields={fields} allowEditing={allowEditing} ref={(tree) => { treeObj = tree; }} nodeEdited={onNodeEdited.bind(this)}/>
</div>
<div id="display"></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, NodeEditEventArgs} from '@syncfusion/ej2-react-navigations';
import {enableRipple} from '@syncfusion/ej2-base';
enableRipple(true);
function App() {
let treeObj: TreeViewComponent;
// Hierarchical data source for TreeView component
let hierarchicalData: { [key: string]: Object }[] = [
{ id: '01', name: 'Local Disk (C:)', expanded: true,
subChild: [
{
id: '01-01', name: 'Program Files',
subChild: [
{ id: '01-01-01', name: 'Windows NT' },
{ id: '01-01-02', name: 'Windows Mail' },
{ id: '01-01-03', name: 'Windows Photo Viewer' },
]
},
{
id: '01-02', name: 'Users', expanded: true,
subChild: [
{ id: '01-02-01', name: 'Smith' },
{ id: '01-02-02', name: 'Public' },
{ id: '01-02-03', name: 'Admin' },
]
},
{
id: '01-03', name: 'Windows',
subChild: [
{ id: '01-03-01', name: 'Boot' },
{ id: '01-03-02', name: 'FileManager' },
{ id: '01-03-03', name: 'System32' },
]
},
]
},
{
id: '02', name: 'Local Disk (D:)',
subChild: [
{
id: '02-01', name: 'Personals',
subChild: [
{ id: '02-01-01', name: 'My photo.png' },
{ id: '02-01-02', name: 'Rental document.docx' },
{ id: '02-01-03', name: 'Pay slip.pdf' },
]
},
{
id: '02-02', name: 'Projects',
subChild: [
{ id: '02-02-01', name: 'ASP Application' },
{ id: '02-02-02', name: 'TypeScript Application' },
{ id: '02-02-03', name: 'React Application' },
]
},
{
id: '02-03', name: 'Office',
subChild: [
{ id: '02-03-01', name: 'Work details.docx' },
{ id: '02-03-02', name: 'Weekly report.docx' },
{ id: '02-03-03', name: 'Wish list.csv' },
]
},
]
},
{
id: '03', name: 'Local Disk (E:)', icon: 'folder',
subChild: [
{
id: '03-01', name: 'Pictures',
subChild: [
{ id: '03-01-01', name: 'Wind.jpg' },
{ id: '03-01-02', name: 'Stone.jpg' },
{ id: '03-01-03', name: 'Home.jpg' },
]
},
{
id: '03-02', name: 'Documents',
subChild: [
{ id: '03-02-01', name: 'Environment Pollution.docx' },
{ id: '03-02-02', name: 'Global Warming.ppt' },
{ id: '03-02-03', name: 'Social Network.pdf' },
]
},
{
id: '03-03', name: 'Study Materials',
subChild: [
{ id: '03-03-01', name: 'UI-Guide.pdf' },
{ id: '03-03-02', name: 'Tutorials.zip' },
{ id: '03-03-03', name: 'TypeScript.7z' },
]
},
]
}
];
let fields: object = { dataSource: hierarchicalData, id: 'id', text: 'name', child: 'subChild' };
let allowEditing:boolean = true;
function onNodeEdited(args: NodeEditEventArgs) {
let displayContent:string = "";
if (args.newText.trim() == "") {
args.cancel=true;
displayContent = "TreeView item text should not be empty";
}
else if (args.newText != args.oldText) {
displayContent = "TreeView item text edited successfully";
} else {
displayContent = "";
}
document.getElementById("display").innerHTML = displayContent;
}
return (
<div className = 'control-pane'>
<div className='control-section'>
<div className='control_wrapper'>
{/* Render TreeView */}
<TreeViewComponent fields={fields} allowEditing={allowEditing} ref={(tree) => { treeObj = tree}} nodeEdited={onNodeEdited.bind(this)} />
</div>
<div id="display"></div>
</div>
</div>
)
}
export default App;
ReactDOM.render(<App />, document.getElementById('sample'));