How to create a blinking effect for buttons in an Angular app with ng-if or ng-show

I've come across the same issue in two separate angular projects I've been involved with, but have not been able to find any discussion on this particular problem. This leads me to believe that there may be something I am overlooking. Let's say I have a view of a 'task' which can exist in various states such as 'pending', 'accepted', and 'completed'. Different action buttons will be displayed based on the task's current state, like so:

<button ng-if="task.status === 'pending'" ng-click="ctrl.acceptTask()">Accept</button>

<button ng-if="task.status !== 'accepted'" ng-click="ctrl.acceptTask()">Flag</button>
<button ng-if="task.status === 'accepted'" ng-click="ctrl.flagTask()">Complete</button>

The problem arises when the user clicks the accept button, causing both of the following buttons to briefly appear simultaneously. It seems like Angular is traversing through the DOM sequentially, and during that short interval between ng-if conditions, both the 'flag' and 'complete' buttons are displayed because only one has been updated. This same issue occurs with ng-show.

It's worth noting that this issue cannot be resolved using ng-cloak, as its purpose is solely to prevent template display before Angular processing is complete.

Considering that I’ve encountered this issue in both of the substantial Angular applications I've worked on, it appears to be a common challenge. Any suggestions on how this is typically addressed? (PS: The provided HTML code is just an illustrative example, not my actual template.)

Answer №1

NgIf removes and recreates elements in the DOM, creating a new scope when restored. The scope inherits from its parent using prototypal inheritance, and elements are recreated in their compiled state.

If ngIf evaluates to false, the element will be removed unless set to true immediately after. Angular refreshes the DOM after the current synchronous block of code.

The following code snippet has no effect:

$scope.task.status= 'pending'; <br/>
$scope.task.status= 'accept';

However, this code will show an effect:

$scope.task.status= 'pending';
// $timeout will wait for a digest cycle before executing the code
// Angular will remove the button from the DOM
$timeout(function() {
   $scope.task.status= 'accept';
   // Here a second digest cycle happens, angular will put the button back into the DOM
});

To reduce flickering buttons caused by heavy DOM contents, consider reducing watchers with available tools and resources. Referencing Angular documentation suggests using ng-switch over multiple ng-shows to prevent flickering. Using directive initialization functions can also help achieve a generic solution for inter-instance communication without worrying about current scope.

Answer №2

By utilizing ng-if statements like the ones below, you can ensure that only one option is displayed at a time. If both options are visible simultaneously, it could be due to interference in your code disrupting the angular digest cycle, causing a delay in the two-way binding of fields and button rendering.

<button ng-if="task.status !== 'accepted'" ng-click="ctrl.acceptTask()">Flag</button>
<button ng-if="task.status === 'accepted'" ng-click="ctrl.flagTask()">Complete</button>

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