Add throttle argument for $watch

[RavenHursT]

So, I have a snippet of code that I keep copy and pasting all over my controllers for handling "auto-saving" functionality for objects:

var pendingPromise = null;
        //Set up watch to auto save CTA on changes, but throttled once every 500ms.
        $scope.$watch('myObject', function(nv, ov){
            if((nv && ov) && (!_.isEqual(nv, ov))){
                if (pendingPromise) {
                    $timeout.cancel(pendingPromise);
                }

                pendingPromise = $timeout(function () {
                    persistMyObject();
                }, 500, false);
            }
        }, true);

I do this so that the API the underlying service talks to doesn't get inundates w/ requests, especially for ui components like sliders that change the model incrementally very quickly. If would be wonderful if in some later release of Angular if this were condensed down to something like:

$scope.$throttledWatch('myObject', function(nv, ov){
    if(nv){
        persistMyObject();
    }
}, true, 500);

Where 500 is the time in milliseconds to set on the throttle.

[mhevery]

This is the wrong repo. I think you may want to start on StackOverflow first or AngularJS repo.

[RavenHursT]

Oops.. sorry about that.

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