Updates to mousetrap key bindings are being reflected in the $scope object, but are not being detected by the

I have developed a function that updates a scope variable as shown below:

// controller.js

$scope.variable = 0;
$scope.$watch('variable', function(){
  console.log("change from watch");
});

$scope.increment = function(){
  $scope.variable++;
  console.log($scope.variable)
}

When I associate a key with this function using Mousetrap,

Mousetrap.bind('j', $scope.increment)

the console.log in the browser indicates that the variable is incremented when the key "j" is pressed. However, the $scope.$watch function mentioned above is not triggered and the message "change from watch" is not displayed.

On the other hand, when I add a click handler in the HTML file,

// index.html
<a ng-click="increment()">{{ variable }}</a>

The variable increases, console.log confirms that $scope.variable is incremented, and the $watch function is executed.

Furthermore, {{ variable }} does not update when I use the key binding, but it does update when I click on it.

It seems that there might be a missing synchronization between Mousetrap and AngularJS $scope causing the function to fire out of sync with AngularJS?

Answer №1

Ensure you explore the concept of Data binding in AngularJS. Essentially, for AngularJS to respond to changes, a $digest needs to be triggered. The built-in ngClick directive takes care of this automatically.

When utilizing non-AngularJS APIs (like Mousetrap), it is necessary to manually envelop the callback in $apply, for example:

Mousetrap.bind('j', () => $scope.$apply($scope.increment));

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