Replace current CSS classes with new classes provided by the API

One of the challenges I'm facing involves overriding existing classes that I've defined in an Angular component's SCSS file. In this unique scenario, different styles will be retrieved from an API, each with a class name associated with the component and updated styles. The goal is to update the component by overriding its existing styling. Unfortunately, using ngClass or ngStyle won't work in this case, as I'll be receiving a string containing all the classes within the component along with some revised styles. This customization must be individualized for each component, meaning that every component should override the styles specified in its stylesheet. How can I completely override the individual style of a component? Any guidance would be greatly appreciated.

Answer №1

There are two strategies to consider:

1) Start by adding the .initial-styles class to your component. Remove it once the API call is complete and then implement your lazy styles.

2) Create .css bundles within your service. Begin by adding the .initial-styles class to your component, along with all the necessary .css assets. Then, remove the .initial-styles class.

Explanation:

1) Take a look at this practical demonstration of the first approach.

  1. Include an initial-style rule that encompasses all other rules in your .scss file
  2. Upon receiving the API response, execute:
    this.renderer.removeClass(this.d.nativeElement, "initial-style");
    to eliminate the styles. Next, apply your new styles using
    this.renderer.setStyle(this.d.nativeElement, styleProperty, styleValue);
  3. If your .css API response is in a format like this:

    container-style {color: 'red'} .header-style { color: 'yellow' }

    You may need to do some parsing. @Ram has suggested a proposal to streamline this process. Find more information here: https://github.com/angular/angular/issues/36911

2) Building upon the first method, introduce the .initial-styles class, remove it when calling your .css asset, and simply add the class names using

this.renderer.addClass(this.d.nativeElement, "myclass");

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