How to programmatically open an Accordion in Angular 4 - html

Question

I am working in an Angular 4 application in this I have the same accordion in two components .What I want to do is if a user clicked on the accordion from first component I want to get the index of the selected accordion and pass it to second component there I set the selected accordion to open and show the contents in it on page load (without click on it )
currently I have single accordion in first component ,If multiple accordion binds from API the selected index will changed dynamically.
Here is my code :
https://stackblitz.com/edit/angular-bootstrap-carousel-dynamic2-tsrt1w?file=app%2Fone%2Fone.component.html

Answer 1

You can pass id using route params, look into below sample codes for example:
one.component.html
<h5>One Component</h5>
<h6>Categories</h6>
<div class="accordion col-sm-12" id="accordion1" *ngFor='let data of dropdownData; let i=index'>
<div class="accordion-group">
<div class="accordion-heading">
<a class="accordion-toggle h6" data-toggle="collapse" routerLink="/two/{{i}}" data-parent="#accordion1" href="#collapseTwo + i">
{{data?.CAMD_ENTITY_DESC}}
</a>
</div>
</div>
</div>
<br>
app routes
const appRoutes: Routes = [
{path:'one',component:OneComponent},
{path:'two/:id',component:TwoComponent}]
two.component.ts
import { Component, OnInit, ViewChildren, QueryList, AfterViewInit, ElementRef } from '#angular/core';
import { ActivatedRoute } from '#angular/router';
import { CartdataServiceService } from '../cartdata-service.service';
declare var $:any;
#Component({
selector: 'app-two',
templateUrl: './two.component.html',
styleUrls: ['./two.component.css']
})
export class TwoComponent implements OnInit,AfterViewInit {
dropdownData: any;
id:string;
#ViewChildren('accordian') components:QueryList<ElementRef>;
constructor( private route: ActivatedRoute, private CartdataService: CartdataServiceService) {}
ngOnInit() {
this.CartdataService.get_New_Products().subscribe(
data => {
this.dropdownData = data;
console.log(this.dropdownData);
});
this.id = this.route.snapshot.paramMap.get('id');
}
ngAfterViewInit(){
// print array of CustomComponent objects
this.components.changes.subscribe(() => {
let elem=this.components.toArray()[this.id];
$(elem.nativeElement).trigger("click");
console.log(elem);
});
}
}
Now you can use id and select the required index for accordion.
Example Link