Customize the expand and collapse icons in Angular TreeView component
7 Jan 202514 minutes to read
You can customize the TreeView expand and collapse icons by using the cssClass property of TreeView.
Refer to the sample below to see how to customize expand/collapse icons
import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { FormsModule } from '@angular/forms'
import { TreeViewModule } from '@syncfusion/ej2-angular-navigations'
import { Component, ViewChild } from '@angular/core';
import { TreeViewComponent } from '@syncfusion/ej2-angular-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' [cssClass]='cssClass'></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' };
// set the Multi Selection option to TreeView
public cssClass: string = "custom";
}@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';
.custom .e-list-item .e-icons {
font-family: "Customize-icon";
}
.custom.e-treeview .e-list-item div.e-icons.e-icon-expandable::before,
.custom.e-treeview .e-list-item div.e-icons.e-icon-collapsible::before {
content: '\e700';
font-size: 12px;
}
@font-face {
font-family: 'Customize-icon';
src: url(data:application/x-font-ttf;charset=utf-8;base64,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) format('truetype');
font-weight: normal;
font-style: normal;
}
#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));