CODEWITHSUNDEEP
javascriptangularjs
simplejeff
simplejeff

Reputation: 21

AngularJS - How can I $watch a deeply nested array?

I currently have data that looks like the following:

$scope.boardLists = [{
cards: [{a:1, b:2}, {a:2, b:2}]
},

{
cards: [{a:3, b:3}, {a:4, b:4}]
},

{
cards: [{a:5, b:5}, {a:6, b:6}]
}];

How can I watch for changes in the cards array?

I have tried the following so far:

$scope.$watchCollection('boardLists', function(newVal, oldVal){
console.log(newVal);
console.log(oldVal);
});

$scope.$watch('boardLists', function(newVal, oldVal){
console.log(newVal);
console.log(oldVal);
}, true);

Upvotes: 2

Views: 138

Answers (2)

georgeawg
georgeawg

Reputation: 48968

Scope $watch Depths

$scope.$watch('boardLists', function(newVal, oldVal){
  console.log(newVal);
  console.log(oldVal);
}, true);

Use $scope.$watch('item',fn,true); for a deep watch.

For information, see AngularJS Developer Guide - $scope Watch Depths.

Upvotes: 2

webdeb
webdeb

Reputation: 13211

$watch is a bit expensive, you can try to use $apply

$scope.$apply(function() {
  // do something with the scope
  $scope.boardList.push({cards:...});
});

$apply will automatically rerun your templates

Upvotes: 0

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