How Can I Use Conditional Expressions with AngularJS ngClass?
Dec 10, 2024 am 10:43 AM
Conditional Expressions in AngularJS ngClass
AngularJS ngClass directive allows you to conditionally apply CSS classes to HTML elements based on boolean expressions. To make an expression conditional, you can use the following syntax:
ng-class="{test: condition}"
Where condition is a JavaScript expression that evaluates to true or false.
Example:
Suppose you have an object obj with a property value1 set to 'someothervalue'. You can conditionally apply the CSS class 'test' to an element using the following ngClass expression:
<span ng-class="{test: obj.value1 == 'someothervalue'}">test</span>
If obj.value1 is equal to 'someothervalue', the 'test' class will be applied to the element.
Truthy and Falsey Expressions:
The ngClass directive evaluates expressions as 'truthy' or 'falsey' values. A truthy value (e.g., 'true', '1', 'yes') will apply the class, while a falsey value (e.g., 'false', '0', 'no') will not apply the class.
Complex Expressions:
If your conditional logic becomes too complex, you can use a function that returns a truthy or falsey value.
Example:
<span ng-class="{test: checkValue1()}">test</span>
$scope.checkValue1 = function() {
return $scope.obj.value === 'somevalue';
}
Logical Expressions:
You can also use logical operators to form logical expressions in ngClass.
Example:
ng-class="{'test': obj.value1 == 'someothervalue' || obj.value2 == 'somethingelse'}"
This expression will apply the 'test' class if either obj.value1 is equal to 'someothervalue' or obj.value2 is equal to 'somethingelse'.
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