[英]AngularJS: Array and deep $watch doesn't work
I have an array with boolean values and what I need to do is try to use the $watch function in order to show a message when some change happens in the array. 我有一个带有布尔值的数组,我需要做的是尝试使用$ watch函数,以便在数组中发生某些更改时显示一条消息。
As you can see in this code the array changes its values but the $watch function doesn't work. 如您在此代码中所见,数组更改了其值,但$ watch函数不起作用。 Any idea? 任何想法?
View 视图
<div data-ng-repeat="catA in categoryA">
<b><input type="checkbox" checked="checked" ng-model="arrayCategoryA[$index]"/>{{catA.name}}</b>
</div>
Controller 控制者
app.controller("controllerApp", function($scope, $http, $filter){
$scope.arrayCategoryA = [];
$scope.$watchCollection($scope.arrayCategoryA, function(newVal, oldVal){
console.log("something changed");
}, true);
$http.get("categoryA.json").success(function(data) {
$scope.categoryA = data;
for (var i = 0; i < $scope.categoryA.length; i++)
$scope.arrayCategoryA[i] = true;
});
});
$watchCollection
takes a watch expression and in this case is the name of the scope variable of arrayCategoryA
. $watchCollection
一个监视表达式,在这种情况下,它是arrayCategoryA
的作用域变量的arrayCategoryA
。
$scope.$watchCollection(`arrayCategoryA`, function(newVal, oldVal){
console.log("something changed");
}, true);
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