Enhancing HTML element appearance in TypeScript and Angular: A guide to adding style

I have been attempting to apply the flex-grow property to an element, but it does not seem to be taking effect.

Here is the script I am using:

(this.elementRef.nativeElement as HTMLElement).setAttribute(
      'style',
      'flex-grow:' + this.panel.width && this.panel.width.type === 1 ? '0' : '1'
    );

After running the script, the final result is as follows:

<ev-panel class="ev-panel ng-star-inserted" style="0" ng-reflect-panel="[object Object]"></ev-panel>
<ev-panel class="ev-panel ng-star-inserted" style="0" ng-reflect-panel="[object Object]"></ev-panel>
<ev-panel class="ev-panel ng-star-inserted" style="1" ng-reflect-panel="[object Object]"></ev-panel>

Although the styles appear to be applied correctly, I am confused about where the flex-grow property is. Any assistance or explanation would be greatly appreciated.

cssangulartypescript

Answer №1

When working with Angular, you can easily utilize @HostBinding:

export class PanelComponent {
  @HostBinding('style.flex-grow')
  get flexGrow(): string {
    return this.panel?.type === 1 ? '0' : '1'
  }
}

The reason your code may not be functioning as expected is due to the absence of parentheses. The entire expression preceding the question mark is evaluated first, including the flex-grow property. To achieve it in a different way (not recommended), you would need to modify it like so:

(this.elementRef.nativeElement as HTMLElement).setAttribute(
  'style',
  'flex-grow:' + (this.panel.width && this.panel.width.type === 1 ? '0' : '1')
);

Furthermore, with the latest versions of Angular/TypeScript, you have the option to employ optional chaining:

(this.elementRef.nativeElement as HTMLElement).setAttribute(
  'style',
  `flex-grow: ${this.panel.width?.type === 1 ? '0' : '1'}`
);

However, using @HostBinding is generally recommended when working with Angular.

Answer №2

Would you mind giving this a shot?

((this.elementRef.nativeElement as HTMLElement).setAttribute(
      'style',
      `flex-grow: ${this.panel.width && this.panel.width.type === 1 ? 0 : 1}`
    );

Fingers crossed that this will do the trick.

Answer №3

Discover the power of the Angular Renderer2, which serves as a useful abstraction within Angular. This service allows you to manipulate elements within your application without needing to directly interact with the DOM. It is highly recommended to use this approach for optimal efficiency.

     constructor(private renderer: Renderer2, private el: ElementRef) {

     const flexGrowValue = + this.panel.width && this.panel.width.type === 1 ? '0' : '1';

     this.renderer.setStyle(this.el.nativeElement, 'flex-grow',flexGrowValue  )

   }

https://angular.io/api/core/Renderer2

For a simple example, check out: https://stackblitz.com/edit/angular-ivy-3wyy4g

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