Node editing in Angular TreeView component
7 Jan 202515 minutes to read
The TreeView allows you to edit nodes by setting the allowEditing property to true. To directly edit the nodes in place, double click the TreeView node or select the node and press the F2 key.
When editing is completed by losing focus or by pressing the Enter key, the modified node’s text saves automatically. If you do not want to save the modified node’s text in TreeView node, press Escape key. It does not save the edited text to the TreeView node.
-
Node editing can also be performed programmatically by using the
beginEditmethod. When passing the node ID or element through this method, an edit textbox will be created for the particular node, allowing it to be edited. -
If you need to validate or prevent editing, you can use the
nodeEditingevent. This event is triggered before the TreeView node is renamed. On successfully renaming a node thenodeEditedevent will be triggered.
In the following example, the first level node’s text cannot be changed, but all other level nodes’ text can be changed.
import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { FormsModule } from '@angular/forms'
import { TreeViewModule, TreeViewComponent } from '@syncfusion/ej2-angular-navigations'
import { Component, ViewChild } from '@angular/core';
import { NodeCheckEventArgs } from '@syncfusion/ej2-navigations';
@Component({
imports: [
FormsModule, TreeViewModule
],
standalone: true,
selector: 'app-container',
// specifies the template string for the TreeView component
template: `<div id='treeparent'><ejs-treeview id='treeelement' [fields]='field' [allowEditing]='allowEditing' (nodeEditing)='editing($event)'></ejs-treeview></div>`
})
export class AppComponent {
@ViewChild('samples')
public tree?: TreeViewComponent;
constructor() {
}
// defined the array of data
public hierarchicalData: Object[] = [
{
id: '01', name: 'Local Disk(C:)', expanded: true,
subChild: [
{
id: '01-01', name: 'Program Files',
subChild: [
{ id: '01-01-01', name: '7-Zip' },
{ id: '01-01-02', name: 'Git' },
{ id: '01-01-03', name: 'IIS Express' },
]
},
{
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' },
]
},
]
}
];
// maps the appropriate column to fields property
public field: Object = { dataSource: this.hierarchicalData, id: 'id', text: 'name', child: 'subChild' };
// enable the editing options to the TreeView
public allowEditing: boolean = true;
//Bind the nodeChecked event
public editing(args: NodeCheckEventArgs) {
//check whether node is root node or not
if (args.node.parentNode?.parentNode?.nodeName !== "LI") {
args.cancel = true;
}
};
}@import 'node_modules/@syncfusion/ej2-base/styles/material.css';
@import 'node_modules/@syncfusion/ej2-inputs/styles/material.css';
@import 'node_modules/@syncfusion/ej2-buttons/styles/material.css';
@import 'node_modules/@syncfusion/ej2-angular-base/styles/material.css';
@import 'node_modules/@syncfusion/ej2-angular-navigations/styles/material.css';
@import 'node_modules/@syncfusion/ej2-angular-inputs/styles/material.css';
#treeparent {
display: block;
max-width: 400px;
max-height: 330px;
margin: auto;
overflow: auto;
border: 1px solid #dddddd;
border-radius: 3px;
}import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));