Animations do not trigger with content changes in AngularJS ngIf

According to the Angular documentation on ngIf, animations occur just after the contents change and a new DOM element is created and injected into the ngIf container.

Animations

In my experience, I have encountered issues with this behavior. To demonstrate, I created a plunker showing that changing the content does not trigger the enter animation as expected. Interestingly, setting the content to undefined and using a 1ms $timeout for initialization seems to resolve the issue.

My question is: Why doesn't simply changing the content trigger the enter and leave animations as outlined in the documentation?

javascriptangularjs

Answer №1

The reason for this issue is when you manipulate your model - item - and set an undefined value followed by a Date object. To add a new item to the list, it is recommended to utilize ng-repeat.

Answer №2

The ngIf directive displays the animation when the condition changes. Since it is based on an if statement, it only recognizes true and false values. If the condition changes from true to true, the animation will not be activated.

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