Tips for adding custom styles to content within an Angular component

I am having trouble applying styles to a child element within a custom component.

Selectors:

<custom-component-example></custom-component-example>

Code snippet from custom-component-example.html:

<button>
    <ng-content></ng-content>
</button>

When I try to style it like this:

<custom-component-example style="color: green">some text</custom-component-example>

Or like this:

<custom-component-example [ngStyle]="{'color': green}">some text</custom-component-example>

The button text does not turn green. The styling could be anything, such as font-weight or size, among other things.

I have also attempted the solutions found in this discussion:

Best way to pass styling to a component

However, none of these solutions seem to affect the child element (in this case, the button).

How can I pass any styling and apply it to the child element? In this example, how would I pass styling through the custom-component-example selector and apply it to the button along with its text?

Thank you in advance.

Answer №1

Instead of modifying the child style directly from the parent, consider following these steps:

Assign a class to the parent element (for example, green-button). In the child's CSS, check if the parent has the class green-button, and then adjust its color accordingly.

In the child's CSS file ->

:host-context(.green-button) button{
color : green
}

Avoid transferring styles from parent to child as it can disrupt Angular's ViewEncapsulation feature. Here is some further information: Link

The child component should be in charge of defining how its button appears. The parent should focus on its own styling. If you add more children to the parent in the future, managing which styles apply to each child becomes easier using this method.

If this advice was helpful, please upvote and mark as solved. Thank you!

Answer №2

Try transforming styles to [styles]

example-of-custom-component.html

<button [ngStyle]="styles">
    <ng-content></ng-content>
</button>

example-of-custom-component.ts

@Input() styles: any = {};

Example of use:

<custom-component-example [styles]="{color: green}">some text</custom-component-example>

Answer №3

To ensure the child component receives the style property, utilize @Input() in your code.

The HTML code for your child component should resemble this:

<div [className]="tableCss">
</div>

The TypeScript file for your child component should include:

@Input() tableCss: string;

Your Parent component should be structured like so:

<app-list [tableCss]="'table-responsive table-borderless table-grid mt-4 border-top border-primary'"></app-list>

Answer №4

If you're looking to simplify the use of input and styles in your CSS without having to deeply select elements like this:

a > b > c {
    color: green;
}

Consider changing your approach to something like this:

class CustomComponentExample {
    @Input() styles;
}

Now, apply styles to your input like so:

<custom-component-example [styles]="{'color': green}">some text</custom-component-example>

You can then utilize this property in your component as follows:

<button [ngStyle]="styles">
    <ng-content></ng-content>
</button>

Answer №5

Give this a shot:

  1. Add the specified class to your template file for that component, as shown below. (class='toggle-button').

<custom-component-example class="toggle-button"> Button name </custom-component-example>

  1. Utilize ::ng-deep in your scss file for styling this class and make sure to include !important with the parameters.

     ::ng-deep .toggle-button { .switch-btn {
     width: 80px !important;
     height: 40px !important;}}
    

*The "switch-btn" class is within the parent component.

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