Using ng-class in AngularJS

There are three ways:

1. Bind with $scope (not recommended)

2. Bind by object array

3. Bind by key/value pair

Implementation method:

$scope binding (not recommended) :

function ctrl($scope) { 
    $scope.className = "selected";
}
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<div class="{{className}}"></div>
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2, through object array binding:

function ctrl($scope) { 
    $scope.isSelected = true;
}
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<div ng-class="{true:'selected',false:'unselected'}[isSelected]"></div>
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When isSelected is true, add the selected style. Add the unselected style when isSelected is false.

Key /value pair binding:

function ctrl($scope) { 
    $scope.isA = true;
    $scope.isB = false;
    $scope.isC = false;
}
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<div ng-class="{'A':isA,'B':isB,'C':isC}"></div>
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Add A style when isA is true; When isB is true, add B style; When isC is true, the C style is added.

<ion-list>
	<ion-item ng-repeat="project in projects" ng-click="selectProject(project, $index)" ng-class="{active: activeProject == project}">
		{{project.title}}
	</ion-item>
</ion-list>
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Ion-item is created from the Projects loop, and the active style is added when activeProject is the project currently looping to.

A few notes:

The first method is not recommended because controller $Scope should only have data and behavior

Ng-class can be used with class