Managing the appearance of one DOM element using another DOM element

Hey there, I'm currently working on an Angular Material tooltip implementation. When I hover over my span element, the tooltip appears. Now, I'm wondering how I can dynamically change the background color of the tooltip based on certain conditions (for example, displaying red for errors and green for success).

Here is the component code:

import {
    Component,
    Input,
    HostBinding,
    OnInit,
    ViewEncapsulation,
    ElementRef,
    AfterViewInit
} from '@angular/core';

@Component({
    selector: 'dbs-tooltip',
    templateUrl: './tooltip.component.html',
    styleUrls: ['./tooltip.component.scss'],
})
export class TooltipComponent implements AfterViewInit{
    @Input() content: any;
    @Input() position: any;
    @Input() type: string;

    constructor(private elRef:ElementRef) {}

    ngAfterViewInit() {
        this.elRef.nativeElement.querySelector('.mat-tooltip');
      }

    getToolTipClass() {
        if (this.type === 'error') {
            return 'error-class';
        } else if (this.type === 'success') {
            return 'success-class';
        }
    }
}   

This is the HTML code:

<span mdTooltip={{content}} mdTooltipPosition={{position}}>
    <ng-content></ng-content>
</span>

And here are the CSS styles:

// md-tooltip-component {
//     div {
//       background: red;      
//     }
//   }


.success-class {
    md-tooltip-component {
        div {
          background: green;      
        }
      }

}

Do you have any ideas or suggestions? Thank you in advance for your assistance.

Answer №1

To customize the appearance of your component, it is important to utilize specific selectors. Explore more on this topic here. Dive deeper into understanding ::ng-deep. It's worth noting that ::ng-deep will eventually be phased out (even though later than /deep/ and >>>).

Answer №2

One possible solution could be to utilize the angular directive ngClass as shown below:

<another-element [ngClass]="(check your condition)? add-success-class : add-error-class">...</another-element>

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