Javascript 检测是否在angularjs ng-change事件中选中或取消选中复选框
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detect if checkbox is checked or unchecked in angularjs ng-change event
提问by Laziale
I want to detect if a checkbox has been checked or unchecked when a click is happening on the checkbox.
我想在复选框上发生单击时检测复选框是否已选中或未选中。
This is what I have:
这就是我所拥有的：
<input type="checkbox" ng-model="answers[item.questID]" ng-change="stateChanged()" />
And then in the controller I have:
然后在控制器中我有：
$scope.stateChanged = function () {
alert('test');
}
I'm able to fire the alert when I do check/uncheck but how can I detect the state of the checkbox? I did research a bit to find a similar issue but I wasn't able to get what I need.
我可以在选中/取消选中时触发警报，但如何检测复选框的状态？我做了一些研究以找到类似的问题，但我无法得到我需要的东西。
Thanks, Laziale
谢谢，拉齐亚莱
回答by PSL
You could just use the bound ng-model(answers[item.questID]) value itself in your ng-change method to detect if it has been checked or not.
您可以在 ng-change 方法中使用 bound ng-model( answers[item.questID]) 值本身来检测它是否已被检查。
Example:-
例子：-
<input type="checkbox" ng-model="answers[item.questID]"
ng-change="stateChanged(item.questID)" /> <!-- Pass the specific id -->
and
和
$scope.stateChanged = function (qId) {
if($scope.answers[qId]){ //If it is checked
alert('test');
}
}
回答by Brennan
The state of the checkbox will be reflected on whatever model you have it bound to, in this case, $scope.answers[item.questID]
复选框的状态将反映在您绑定到的任何模型上，在这种情况下， $scope.answers[item.questID]
