Why does ng-class replace existing classes?

[Johan Steenkamp]

I could not find a thread about this.

Would it not make more sense to retain any existing classes when applying a class dynamically using ng-class?

http://docs-next.angularjs.org/api/angular.module.ng.$compileProvider.directive.ng-class

Its common if using jQuery to add/remove classes rather than replace them all which makes sense given how classes are typically used - in combination and not individually like IDs.

Example: Tabbed forms, where I set the active tab using class="active". Say I want to alter the tab text to red if the form in the tab is invalid I could use class="valid-{{myForm.$valid}}" and CSS style .valid-false {color:red}

However the binding will remove .active

Interested in why all classes are replaced and/or if I missed a better solution.

Thanks

[Peter Bacon Darwin]

Ng-class does not remove static entries inthe attribute. If you want both active and error then just create a controller method that returns an array of class strings based on whether the tab is in error and/or active.

...from my mobile.

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[Misko Hevery]

ng-class appends classes, why do you think it replaces???

-- misko