angular ng-if or ng-show responds slow (2second delay?)

I'm trying to show or hide a loading indicator on a button when a request is busy. I do that with angular by changing the $scope.loading variable when a request is loading or when it's done loading.

 $scope.login = function(){
     $scope.loading = true;
    apiFactory.getToken()
        .success(function(data){
            
        })
        .error(function(error){
            
        })
         .finally(function(){
               $timeout(function() {
                 $scope.loading = false;
               }, 0);
         });
 };

In the frontend:

<button ng-disabled="loading" class="button button-outline button-positive" type="submit">
Log in 
<span ng-if="loading" class="ion-refreshing"></span>
</button>

This works fine, but the loading icon (ion-refreshing) is shown for about 2 seconds, while the $scope variable is updated immediately. I tried $scope.$apply but that doesn't seem to be what's wrong here, the scope is updated just fine and immediately after the request. It's just the icon that isn't responding quickly enough.

Solution 1:

Try removing ngAnimate if you're not using it from your app config and index.html page:

angular.module('myApp', [...'ngAnimate',...])

@Spock; if you still require the use of ngAnimate then leave your app config untouched and just add the following CSS:

.ng-hide.ng-hide-animate{
     display: none !important;
}

That will hide the animated icon straight after your condition is met.

As you can see we are setting .ng-hide-animate to hidden. This is what causes the delay as it waits for the animation to complete. You can add an animation to your hide event as the class name implies instead of hiding it as in the example above.

Solution 2:

I had the same issue, and worked-around it by using ng-class with the 'hidden' class name to hide the element instead of using ng-if or ng-show/ng-hide.

Solution 3:

I found some solutions here, but the best for me was overriding the styling for the .ng-animate class:

.ng-animate.no-animate {
    transition: 0s none;
    -webkit-transition: 0s none;
    animation: 0s none;
    -webkit-animation: 0s none;
}

In html:

<button ng-disabled="loading" class="button button-outline button-positive" type="submit">
    Log in 
    <span ng-if="loading" class="ion-refreshing no-animate"></span>
</button>

This is an example: http://jsfiddle.net/9krLr/27/

I hope help you.