The dropdown cannot be disabled because it is being passed as an input parameter

We are currently utilizing PrimeNG along with Angular 15.

Scenarios: According to the requirements, we need the ability to disable the PrimeNG dropdown control based on a selection.

Problem: The disabled property of <p.dropdown> is not functioning as expected. Even when passing disabled:true, the dropdown remains enabled instead of being disabled.

Explanation: We have developed a reusable dropdown component with an input property using the PrimeNG control<p.dropdown> to meet client specifications.

show-dropdown.component.html

<p-dropdown [disabled]="disable”>Value</p-dropdown>

Show-dropdown.component.ts

import {Input,OnInit,Output,} from '@angular/core';
@Component({
  selector: 'app-show-dropdown',
  templateUrl: './show-dropdown.component.html',
  styleUrls: ['./show-dropdown.component.scss'],
})
export class ShowDropdownComponent implements OnInit {
  @Input()   disabled: boolean
}

We then used this "show-dropdown" component in another component as shown below.

Display-dropdown.component.html

<app-show-dropdown  [disabled]="true"></app-show-dropdown>

When running the application, the dropdown functions correctly. However, the disabled property does not work as intended.

The browser console displays the following message:

It looks like you're using the disabled attribute with a reactive form directive. If you set disabled to true
  when you set up this control in your component class, the disabled attribute will actually be set in the DOM for
  you. We recommend using this approach to avoid 'changed after checked' errors.

  Example:
  // Specify the `disabled` property at control creation time:
  form = new FormGroup({
    first: new FormControl({value: 'Nancy', disabled: true}, Validators.required),
    last: new FormControl('Drew', Validators.required)
  });

  // Controls can also be enabled/disabled after creation:
  form.get('first')?.enable();
  form.get('last')?.disable();

Even after attempting to use [attr.disabled] as a parameter to address the issue, it still persists.

Seeking suggestions on how to successfully resolve this problem.

Answer №1

It appears that the issue lies in attempting to disable a form control using an attribute, which is typically done for Template Driven Forms.

In the case of a reactive form (one that utilizes the FormControlName directive), you should disable it programmatically like so:

this.form.get('controlName').disable();

If this is related to the disabled input, consider adding an ngOnChanges function to monitor and update accordingly:

ngOnChanges(changes) {
   // Check if disabled has changed, then disable or enable as needed
   this.form.get('controlName').disable();
}

Additionally, Angular offers a ControlValueAccessor interface for custom form components. While I won't delve into details here, there are numerous informative articles available on the topic.

Having said that, do you truly need to encapsulate this in a custom component, or would it be simpler to use the primeNg dropdown directly?

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