Yep, you'd have to loop through to determine which was changed $watching an
array. (I don't think you want to $watch each object in array, bad idea)
Comparing objects isn't too difficult with
angular.equals: http://docs.angularjs.org/api/ng/function/angular.equals
But, I have to ask what causes the change on the object that you need
watch? If it is from the ui view then you can put the call on the element
and move the function on the scope:
< li ng-repeat="item in myArray">
<input ng-model="item.name" ng-change="doSomethingWith('name',item)">
</li>
$scope. doSomethingWith(key, item){
//now we know exactly what changed on the object and can do what we
need with it
console.log( 'item name is now ', item[key] )
}
See: http://docs.angularjs.org/api/ng/directive/ngChange
On Friday, March 14, 2014 11:42:40 PM UTC-6, Disha Shah wrote:
>
> I am kinda new to Angular JS, and am trying to figure out a elegant
> solution to watch each object in a array for its property changes.
> I know the way to deep watch an array is by:
>
> $scope.$watch("collection",function( newValue, oldValue ) {
> /* do something*/
> }, true );
>
> But the newValue, oldValue doesn't give away exactly which object in the
> array has changed.
> Other way I can think of is to loop the array and set a watch on each object
> in the array.
>
> Is there a better solution to this?
>
>
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