What is the best way to set a select dropdown to be read-only or disabled based on certain conditions

Question

What is the best way to set a select dropdown to be read-only or disabled based on certain conditions

I am currently working with Angular7 and I am looking for a way to conditionally make a select element readonly or disabled.

Regarding the readonly attribute, my attempt was:

  editable: boolean = true;

Here is the template I used:

<select #listOfOptions="ngModel" [(ngModel)]="myList" [readonly]="!editable" class="form-control">
    </select>

However, this resulted in the following error message:

Error: Template parse errors: Can't bind to 'readOnly' since it isn't a known property of 'select'.

An existing issue mentions this problem, but no solutions have been provided yet.

As for the disabled attribute, here's what I attempted:

<select [attr.disabled]="!editable">
...
</select>

Unfortunately, the select element always stays disabled regardless of how I adjust the editable variable.

Any assistance would be greatly appreciated. Thank you.

angular typescript angular7

Answer 1

Answer №1

Consider utilizing the disabled attribute instead of attr.disabled

<select [disabled]="!editable">
...
</select>

Answer 2

Consider utilizing the disabled attribute instead of attr.disabled

<select [disabled]="!editable">
...
</select>

Answer 3

Answer №2

I encountered a similar issue with the owner's post.

Although I tried the accepted answer, it didn't work on my end.

By using the code

[attr.disabled]="!editable ? '' : null"</code>, as mentioned in this <a href="https://stackoverflow.com/questions/49087887/angular-4-select-disabled-is-not-working/49088204">link</a>, it finally worked for me.</p>
<p>Sharing this solution for anyone who may encounter the same problem.</p>
<pre><code><select [attr.disabled]="!editable ? '' : null">
  <option></option>
</select>

Answer 4

I encountered a similar issue with the owner's post.

Although I tried the accepted answer, it didn't work on my end.

By using the code

[attr.disabled]="!editable ? '' : null"</code>, as mentioned in this <a href="https://stackoverflow.com/questions/49087887/angular-4-select-disabled-is-not-working/49088204">link</a>, it finally worked for me.</p>
<p>Sharing this solution for anyone who may encounter the same problem.</p>
<pre><code><select [attr.disabled]="!editable ? '' : null">
  <option></option>
</select>

Answer 5

Answer №3

While you are currently using Template Driven Forms, I would like to introduce an alternative approach for you to consider!

If you decide to switch to Reactive Forms, you have the option to set the disabled property when initializing the form. Although there may be more boilerplate code involved, some individuals actually prefer Reactive Forms over Template Driven Forms.

Here is how you can structure your HTML:

<form [formGroup]="selectForm">
  <select formControlName="mySelect">
    <!-- Populate options here using *ngFor from an array in your component -->
  </select>
</form>

Next, configure your component as follows:

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

@Component({...})
export class MyComponent implements OnInit {

  public selectForm: FormGroup;
  public editable: boolean;
  public options: any[];

  constructor(private formBuilder: FormBuilder) {}

  ngOnInit(): void {
    this.selectForm = this.formBuilder.group({
      mySelect: [
        { value: '', disabled: !editable }
      ]
    });
  }

}

By binding the 'disabled' property of the form control directly to the local variable 'editable', you should achieve the desired functionality.

Answer 6

While you are currently using Template Driven Forms, I would like to introduce an alternative approach for you to consider!

If you decide to switch to Reactive Forms, you have the option to set the disabled property when initializing the form. Although there may be more boilerplate code involved, some individuals actually prefer Reactive Forms over Template Driven Forms.

Here is how you can structure your HTML:

<form [formGroup]="selectForm">
  <select formControlName="mySelect">
    <!-- Populate options here using *ngFor from an array in your component -->
  </select>
</form>

Next, configure your component as follows:

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

@Component({...})
export class MyComponent implements OnInit {

  public selectForm: FormGroup;
  public editable: boolean;
  public options: any[];

  constructor(private formBuilder: FormBuilder) {}

  ngOnInit(): void {
    this.selectForm = this.formBuilder.group({
      mySelect: [
        { value: '', disabled: !editable }
      ]
    });
  }

}

By binding the 'disabled' property of the form control directly to the local variable 'editable', you should achieve the desired functionality.

Answer 7

Answer №4

If a situation arises where things aren't working as expected, here is my go-to solution. I wrap the mat-form-field within a div and adjust the pointer-events to none while reducing the opacity to .5 in order to mimic a readonly or disabled state.

<div
  [style.pointer-events] = "DisableDocumentType(documentIndex) ? 'none' : 'auto'"
  [style.opacity] = "DisableDocumentType(documentIndex) ? .5 : 1"
>
  <mat-form-field appearance="outline" style="width:10vw; align-content: end;">
    <mat-label> {{'app.documentType' | translate}}*</mat-label>
    <mat-select
      formControlName="documentType"
      (selectionChange)="changeDocumentType($event.value, documentIndex)"
    >
      <mat-option [value]="documentType.code" *ngFor="let documentType of documentTypes">{{documentType.name | translate}}
      </mat-option>
    </mat-select>
  </mat-form-field>
</div>

Answer 8

If a situation arises where things aren't working as expected, here is my go-to solution. I wrap the mat-form-field within a div and adjust the pointer-events to none while reducing the opacity to .5 in order to mimic a readonly or disabled state.

<div
  [style.pointer-events] = "DisableDocumentType(documentIndex) ? 'none' : 'auto'"
  [style.opacity] = "DisableDocumentType(documentIndex) ? .5 : 1"
>
  <mat-form-field appearance="outline" style="width:10vw; align-content: end;">
    <mat-label> {{'app.documentType' | translate}}*</mat-label>
    <mat-select
      formControlName="documentType"
      (selectionChange)="changeDocumentType($event.value, documentIndex)"
    >
      <mat-option [value]="documentType.code" *ngFor="let documentType of documentTypes">{{documentType.name | translate}}
      </mat-option>
    </mat-select>
  </mat-form-field>
</div>

What is the best way to set a select dropdown to be read-only or disabled based on certain conditions

Answer №1

Answer №2

Answer №3

Answer №4

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