angular：对象数组中的$ watch对象

Question

For example, I have an array of objects.

$scope.items = [
    {id: 1, name: 'one'},
    {id: 2, name: 'two'},
    {id: 2, name: 'three'}
];

And have in template something like

<div ng-repeat="item in items">
    <input type="text" ng-model="item.name" />
</div>

And I want to add $watch to this like (for track changes in inputs)

$scope.$watch('item', function(newVal){}, true);

What I need to do, if I want have in newVal item like {id: 1, name: 'one'} ?

Not array of objects! Only one changed object in newVal ! I can't create variables for each object of the array in the controller.

I tried something like

for (var i = 0; i < $scope.items.length; i++) {
    $scope.$watch('items[' + i = ']', function(newVal) {
        console.log(newVal);
    }, true);
}

but that wrong.

Answer 1

You can try something like

for (var i = 0; i < $scope.items.length; i++) {
    (function(k){
        $scope.$watch(function(){
            return $scope.items[k]
        }, function(newVal) {
            console.log(newVal);
        }, true);
    })(i);
}

Note: I have not tested the above code;

Answer 2

try this.

 var app = angular .module('MyApp', []) .controller('Main', ['$scope', function($scope) { var vm = this; vm.items = [ {id: 1, name: 'one'}, {id: 2, name: 'two'}, {id: 2, name: 'three'} ]; for (var i = 0; i < vm.items.length; i++) { $scope.$watch('ctrl.items[' + i + ']', function(newVal) { console.log(newVal); }, true); } } ]); 

 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script> <div class="main-content" ng-app="MyApp" ng-controller="Main as ctrl"> <div ng-repeat="item in ctrl.items"> <input type="text" ng-model="item.name" /> </div> </div>