Instructions for including a class are ineffective

I am trying to dynamically add a class to a div based on two conditions. To achieve this, I have created a custom directive as shown below:

import { Directive, HostBinding, Input } from '@angular/core';

@Directive({
  selector: '[confirmdialog-style]',
})
export class ConfirmDialogStyleDirective {
  @Input() isMsgDialog!: boolean;
  @Input() dialogType!: string;

  @HostBinding('class')
  elementClass = this.isMsgDialog ? 'x-' + this.dialogType : '';
}

To use the directive, I incorporate it in my HTML like so:

<div
  class="x-dialog-container"
  confirmdialog-style
  [isMsgDialog]="isMsgDialog"
  [dialogType]="dialogType"
>

I set the values of isMsgDialog and dialogType properties in the parent component through a button click event. Upon inspection in Chrome's debug tools, I confirmed that both input properties are being correctly set.

However, despite setting the correct values, the expected class (e.g., x-danger) is not being added to the div. What could be causing this issue?

Answer №1

Give this a shot to ensure it considers any changes in isMsgDialog and dialogType:

    @HostBinding('class')
    get cssClass() {
        return this.isMsgDialog ? 'x-' + this.dialogType : '';
    }

Answer №2

Your code looks solid, and it's important to validate that isMsgDialog is not empty.

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