Custom trigger for angular multi-select

Question

Is there an angular 2+ multi-select dropdown that has a custom trigger button?

I'm looking for something similar to the old AngularJS "custom trigger element using transclusion" (here)...however, ng-select, ng-multiselect-dropdown and other do not seem to offer this.

I'm looking for any viable options with example code.

Answer 1

Complementary my comment, the component becomes

.html

<div ngbDropdown class="d-inline-block" autoClose="outside">
    <button class="btn btn-outline-primary" id="dropdownBasic1" ngbDropdownToggle>
        {{data.length?data.length+' checked':'Select'}}
  </button>
  <div ngbDropdownMenu aria-labelledby="dropdownBasic1">
        <button class="dropdown-item" *ngFor="let option of options" (click)="check(option)">
          <span *ngIf="option.checked">~ </span>{{option.label}}
        </button>
  </div>
</div>

.ts

import {Component,Input,Output,EventEmitter} from '@angular/core';

@Component({
  selector: 'ngbd-dropdown-basic',
  templateUrl: './dropdown-basic.html'
})
export class NgbdDropdownBasic {
  @Input() options;
  @Output() change = new EventEmitter<any[]>();
  data:any[]=[];
  check(option)
  {
    option.checked=!option.checked;
    this.data=this.options.filter((x:any)=>x.checked).map(x=>
      {
        return {id:x.id,label:x.label}
      })
    this.change.emit(this.data);
  }
}

stackblitz

You can easy convert in custom form control