Exploring the intricacies of incorporating external event handlers in Angular applications

In my current project, I am working on an Angular application that incorporates the Ace editor with ui-ace for text editing on the screen. I am looking to create a function that will execute when the cursor changes, updating a specific model object when the cursor is in a certain position. Additionally, I would like to have the ability to click a button that moves the cursor to a particular location and updates the model object accordingly. You can see a demonstration of this concept on this jsfiddle: http://jsfiddle.net/fpzknzej/3/

The model object updates if the cursor is positioned at the end of the word "print" on the second line. The issue arises when pressing the "Move Cursor!" button, as the $scope.$apply() call on line 30 throws an error while in progress. Omitting this line prevents the view connected to the model object from updating when using arrow keys to move the cursor.

After some consideration, it seems that my current approach may not be the most effective way to achieve this functionality. It appears that wrapping the changeCursor event to exclusively operate within the Angular environment might be a better solution. However, I am uncertain about the best method to tackle this task (I've come across mentions of custom directives) and whether there are any helpful resources available for understanding how to interact with third-party event handlers in Angular. Any guidance or suggestions in the right direction would be greatly appreciated.

Answer №1

Let me simplify this for you.

All angular core event directives like ng-click, ng-change, etc automatically trigger the $apply() function internally.

In your case, when you move the cursor, the digest cycle starts with ng-click, but then there's a bit of a circular problem where an external ace event triggered within ng-click also calls $apply().

You should only call $apply() when events outside of Angular's core framework need to update the view.

A temporary solution for your issue is to use $timeout() instead. This will add the function call to the end of the digest stack queue and execute $apply() once other digests are finished.

Regarding directives, yes, this code should be in a directive, but moving it to a different part of the application won't immediately change the current situation.

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