ngClass
is a built-in directive in Angular that allows you to conditionally add or remove CSS classes to and from an HTML element based on the truthiness of certain expressions. It provides a convenient way to apply styling to an element based on dynamic conditions.
Here's an example of how to use ngClass
in an Angular component template:
html<div [ngClass]="{'highlight': isHighlighted, 'active': isActive}">
This is a sample element.
</div>
In this example, we have a div
element with two CSS classes: highlight
and active
. We're using ngClass
to dynamically apply or remove these classes based on two expressions: isHighlighted
and isActive
.
If isHighlighted
is truthy, then the highlight
class will be applied to the div
element. If isActive
is truthy, then the active
class will be applied to the div
element. If both expressions are falsy, then neither class will be applied to the div
element.
You can also use ngClass
with more complex expressions. For example:
html<div [ngClass]="{'red': isRed, 'blue': isBlue && !isGreen, 'green': isGreen}">
This is another sample element.
</div>
In this example, we're using three expressions to determine which classes to apply to the div
element:
- If
isRed
is truthy, then thered
class will be applied. - If
isBlue
is truthy andisGreen
is falsy, then theblue
class will be applied. - If
isGreen
is truthy, then thegreen
class will be applied.
ngClass
can also accept an array of expressions, which can be useful for applying multiple classes based on different conditions.
Overall, ngClass
provides a powerful way to conditionally apply CSS classes in an Angular application, making it easy to create dynamic, responsive UIs.
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