Adding Angular directives to the DOM after the document has finished loading does not function properly in conjunction with ngAnimate

I've been working on developing an Angular service that can dynamically append a notification box to the DOM and display it without the need to manually add HTML code or write show/hide logic.

This service, named $notify, can be used as follows:

$notify.error( "this is an error", {position: "bottom-left"} );

The service leverages angular.element to construct the notification box and insert it into the DOM. While this functionality is functioning properly, I've encountered an issue when trying to implement animations using ngAnimate and animate.css. When I manually insert the notification HTML code into my page, the animations work flawlessly. However, when the code is dynamically added via the service, the animations do not apply. I'm wondering whether elements need to be present in the DOM at document load for ngAnimate to work correctly. Despite confirming that the Angular service is functioning and inserting the HTML code as intended, the animations are not being triggered. See below for the HTML and CSS code snippets:

HTML:

<div class="simple-notify simple-notify-top-left simple-notify-info" ng-if="toggle">
    <simple-notify-header>Hello!<span class='simple-notify-dismiss pull-right' ng-click='doSomething()'>&times;</span></simple-notify-header>
    <simple-notify-body>Some bogus text here!</simple-notify-body>
</div>

CSS/LESS:

.simple-notify {
    &.ng-enter {
        display:none;
        animation: @animate-enter @animation-length;
        -webkit-animation: @animate-enter @animation-length;
    }
    &.ng-enter-active {
        display:block;
    }
    &.ng-leave {
        animation: @animate-leave @animation-length;
        -webkit-animation: @animate-leave @animation-length;
    }
}

Any insights or suggestions would be greatly appreciated! Thank you!

Answer №1

To ensure proper separation of concerns, it is best practice not to directly manipulate elements on the page from a service. Instead, consider creating an attribute directive for your body HTML element to encapsulate your logic. Utilize $rootScope.$broadcast from your $notify service and $scope.$on in your directive for communication. Alternatively, you may opt to forego the $notify service and solely rely on $rootScope.$broadcast, which allows for passing multiple arguments.

Furthermore, remember to utilize the $compile service to ensure that your dynamically added HTML is processed correctly by Angular. The $compile function converts raw DOM into code that Angular can interpret.

Within the scope.$on handler of your directive's link function, you can use the following approach:

$compile('<div>template code here</div>')(scope, function(cloned, scope){
   element.append(cloned); 
});

Consider implementing a cleanup mechanism as well. Instead of constantly adding and removing DOM elements, consider incorporating the code once within the directive's template and toggling its visibility to display different content.

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