The impact of disabling ViewEncapsulation.None on Angular applications

Is there a way to override the effects of ViewEncapsulation.None? For example, I have a component called "firstComponent" that defines a CSS class with certain properties. Another component, "secondComponent," uses the same CSS class. However, I want "secondComponent" to apply different specific values for the properties defined in the stylesheet of the first component. How can I achieve this?

Please note: I tried redefining the class in "secondComponent" with different values while keeping the viewEncapsulation of secondComponent as default, but it did not work for me.

FirstComponent:
@Component({
    moduleId: module.id,
    selector: "FirstComponent",
    templateUrl: 'FirstComponent.component.html',
    styleUrls: ['FirstComponent.component.css'],
    encapsulation: ViewEncapsulation.None
})
FirstComponent.component.css

.ui-tree .ui-tree-container {
    background-color: #252525;
    color: white;
}

Second Component:
@Component({
    moduleId: module.id,
    selector: "SecondComponent",
    templateUrl: 'SecondComponent.component.html',
    styleUrls: ['SecondComponent.component.css'],
})
SecondComponent.Component.css

.ui-tree .ui-tree-container {
    background-color: white;
    color: black;
}

In both components, I am creating p-tree which internally utilizes .ui-tree-container. In my secondComponent, I want the tree's background to be white while in all other instances, the tree's background should remain black.

cssangularangular2viewencapsulation

Answer №1

To keep your styles contained, you can nest your css within each component's selectors.

FirstComponent.component.css

FirstComponent .ui-tree .ui-tree-container {
    background-color: #252525;
    color: white;
}

SecondComponent.component.css

SecondComponent .ui-tree .ui-tree-container {
    background-color: white;
    color: black;
}

This approach ensures that the styles for one component do not impact the styles of another component. You also have the option to use ViewEncapsulation.None for either or both components if needed.

Answer №2

To achieve styling for the FirstComponent, you can opt for Default ViewEncapsulation and utilize the ::ng-deep selector in your CSS files accordingly.

For the SecondComponent:

::ng-deep .ui-tree .ui-tree-container{
  background-color: white;
  color: black;
}

When it comes to the FirstComponent:

::ng-deep .ui-tree .ui-tree-container{
  background-color: #252525;
  color: white;
}

Answer №3

To easily customize specific parts of your CSS while reusing common styles, consider using scss variables

Step #1

Begin by creating a scss file that contains common properties and default colors

commonstyles.scss

$bgColor : white !default;
$color: black !default;

.ui-styles .ui-container {
    background-color: $bgColor;
    color: $color;
}

Step #2

In the scss file for your component, adjust the variable values as needed and import the common scss file

component1.scsss

$bgColor:  #252525; /* Customize colors */
$color: white;
@import './commonstyles.scss';

component2.scss

/* Use default colors */
@import './commonstyles.scss';

It is recommended to maintain the default ViewEncapsulation.Emulated for this approach

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