How to deep watch an array in angularjs?


There is an array of objects in my scope, I want to watch all the values of each object.

This is my code:

function TodoCtrl($scope) {
$scope.columns = [
{ field:'title', displayName: 'TITLE'},
{ field: 'content', displayName: 'CONTENT' }
$scope.$watch('columns', function(newVal) {
alert('columns changed');

But when I modify the values, e.g. I change TITLE to TITLE2, the alert('columns changed') never popped.

How to deep watch the objects inside an array?

There is a live demo:

Problem courtesy of: Freewind


You can set the 3rd argument of $watch to true:

$scope.$watch('data', function (newVal, oldVal) { /*...*/ }, true);


Since Angular 1.1.x you can also use $watchCollection to watch shallow watch (just the “first level” of) the collection.

$scope.$watchCollection('data', function (newVal, oldVal) { /*...*/ });


Solution courtesy of: Piran

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