How can I trigger onchange event of prime ng multiselect control in angular 12

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Hi Team,
I want to trigger onchange of Prime ng multiselect control dynamically from component.ts file where ever i require. but i'm getting issues to achieve it.

What I have tried:

html code of p multiselct
==============================

 lang="HTML"<p-multiSelect id="capturesByFilter"
ngModelChange)="value" 
#capFilter [options]="captures" 
placeholder="Please Select"
(onChange)="filter($event.value); 

applyCaptureNameFilter($event.value)" 
optionLabel="name" 
appendTo="body" 
formControlName="selectedCaptureInfo" 
[filter]="true">

component.ts
==============

TypeScript

@ViewChild('capFilter') capFilter;

loadAllFilterData(){
this.capFilter.nativeElement.dispatchEvent(new Event('change'));
}

i'm getting console error like capFilter.nativeElement is undefined.
How can i solve this to trigger onchange event.

Thanks in advance.

Posted 13-Jul-23 4:56am

pavan_ kumar

Updated 14-Jul-23 1:18am

Andre Oosthuizen

v3

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Syed Mubashshir Hasan · Answer 1 · 2023-07-13T06:47:00

Solution 1

In order to trigger the onChange event of the PrimeNG multiselect control dynamically from the component.ts file, you can make use of the updateModel method provided by the MultiSelect component.
HTML code of p-multiselect:

<p-multiSelect #capFilter [options]="captures" placeholder="Please Select" optionLabel="name"
  [(ngModel)]="selectedCaptureInfo" (onChange)="filter($event.value); applyCaptureNameFilter($event.value)"
  [filter]="true"></p-multiSelect>

Posted 13-Jul-23 6:47am

Syed Mubashshir Hasan

Comments

pavan_ kumar 13-Jul-23 14:31pm

Hi,
Thanks for giving reply. I've tried by putting [(ngModel)]. But in my case, i've to use formcontrolname in order to work my other logic which i've written in my code. and using of ngmodel and formcontrolname at a time has deprecated in angular 12, So, i can't use both at a time.
Please let me know any other approach by using formcontrolname only.
Thanks.

Andre Oosthuizen · Answer 2 · 2023-07-14T01:17:00

You can trigger the 'onChange' event of your control by using the 'valueChanges' event of the form control, a method not deprecated. a Full tutorial is available at - ValueChanges in Angular Forms [^]

To do this, import the necessary classes in your component's TypeScript file -

TypeScript

import { Component, OnInit } from '@angular/core';
import { FormControl } from '@angular/forms';

Now create a form control for your 'selectedCaptureInfo' field and subscribe to its 'valueChanges' observable -

TypeScript

export class YourComponent implements OnInit {
  selectedCaptureInfoControl: FormControl;

  ngOnInit() {
    this.selectedCaptureInfoControl = new FormControl();

    this.selectedCaptureInfoControl.valueChanges.subscribe(value => {
      //Call your function(s) when the value changes
      this.filter(value);
      this.applyCaptureNameFilter(value);
    });
  }

  //Rest of your component code
}

Bind the 'selectedCaptureInfoControl' to the 'formControlName' in your HTML code -

HTML

<p-multiSelect id="capturesByFilter"
               [options]="captures"
               placeholder="Please Select"
               optionLabel="name"
               appendTo="body"
               [filter]="true"
               [formControl]="selectedCaptureInfoControl">
</p-multiSelect>