Set the nested accordion in Angular Accordion component

18 Sep 202510 minutes to read

Nested Accordions allow hierarchical organization of content within the Syncfusion Angular Accordion component, enabling multi-level expandable sections for applications like navigation menus, FAQs, or data trees. Render a child Accordion inside the content area of a parent Accordion item using Angular’s ng-template. This approach integrates the nested Accordion with full functionality, including expand/collapse behavior.

To set up nested Accordions, ensure the @syncfusion/ej2-angular-navigations package is installed and imported. Use ng-template inside each e-accordionitem tag with the #content attribute to define the item’s content area. Then, apply ng-template with a select attribute referencing an ID or class to map the nested content. Note that ng-template is an Angular core directive and requires no additional imports.

app.component.ts

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { AccordionModule } from '@syncfusion/ej2-angular-navigations'



import { Component, ViewChild } from '@angular/core';
import { AccordionComponent } from '@syncfusion/ej2-angular-navigations';
import { ExpandEventArgs, Accordion, AccordionClickArgs} from '@syncfusion/ej2-navigations';

@Component({
imports: [
         AccordionModule
    ],


standalone: true,
    selector: 'app-container',
    template: `
      <ejs-accordion>
        <e-accordionitems>
          <e-accordionitem expanded="true">
            <ng-template #header>
              <div>Video</div>
            </ng-template>
            <ng-template #content>
              <ejs-accordion>
                <e-accordionitems>
                  <e-accordionitem>
                    <ng-template #header>
                      <div>Video Track 1</div>
                    </ng-template>
                  </e-accordionitem>
                  <e-accordionitem>
                    <ng-template #header>
                      <div>Video Track 2</div>
                    </ng-template>
                  </e-accordionitem>
                </e-accordionitems>
              </ejs-accordion>
            </ng-template>
          </e-accordionitem>
          <e-accordionitem>
            <ng-template #header>
              <div>Music</div>
            </ng-template>
            <ng-template #content>
              <ejs-accordion>
                <e-accordionitems>
                  <e-accordionitem>
                    <ng-template #header>
                      <div>Music Track 1</div>
                    </ng-template>
                  </e-accordionitem>
                  <e-accordionitem>
                    <ng-template #header>
                      <div>Music Track 2</div>
                    </ng-template>
                  </e-accordionitem>
                  <e-accordionitem>
                    <ng-template #header>
                      <div>Music New</div>
                    </ng-template>
                    <ng-template #content>
                      <ejs-accordion>
                        <e-accordionitems>
                          <e-accordionitem>
                            <ng-template #header>
                              <div>New Track 1</div>
                            </ng-template>
                          </e-accordionitem>
                          <e-accordionitem>
                            <ng-template #header>
                              <div>New Track 2</div>
                            </ng-template>
                          </e-accordionitem>
                        </e-accordionitems>
                      </ejs-accordion>
                    </ng-template>
                  </e-accordionitem>
                </e-accordionitems>
              </ejs-accordion>
            </ng-template>
          </e-accordionitem>
          <e-accordionitem>
            <ng-template #header>
              <div>Images</div>
            </ng-template>
            <ng-template #content>
              <ejs-accordion>
                <e-accordionitems>
                  <e-accordionitem>
                    <ng-template #header>
                      <div>Track 1</div>
                    </ng-template>
                  </e-accordionitem>
                  <e-accordionitem>
                    <ng-template #header>
                      <div>Track 2</div>
                    </ng-template>
                  </e-accordionitem>
                </e-accordionitems>
              </ejs-accordion>
            </ng-template>
          </e-accordionitem>
        </e-accordionitems>
      </ejs-accordion>
      `
})

export class AppComponent {
}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));