AngularJS:指望改变所选项目 [英] AngularJS: count selected items on change
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问题描述
我有一些自定义控件的形式。在这种形式下,我需要显示numRequired的numSelected。我知道numRequired,但我怎么能弄清楚numSelected?
I have a form with some custom controls. At the bottom of this form, I need to display "numSelected of numRequired". I know "numRequired", but how can I figure "numSelected"?
的形式看起来是这样的:
The form looks something like this:
<div ng-controller="MyCtrl">
<fieldset ng-repeat="item in items">
<div class="buttons" ng-init="selectedVal=1">
<label>
<input type="radio" name="item{{$index}}" ng-model="selectedVal" value="1" ng-selected="selectedVal==1">
</label>
<label>
<input type="radio" name="item{{$index}}" ng-model="selectedVal" value="0" ng-selected="selectedVal==0">
</label>
</div>
</fieldset>
<div>{{numSelected}} of {{numRequired}}</div>
</div>
我试过搭售 NG-点击
和 NG-变化
来的每个输入和做在计数 MyCtrl
,但我想我不知道怎么算符合条件的,一旦我在那里我的项目。
I've tried tying ng-click
and ng-change
to each input and doing the counting in MyCtrl
but I guess I don't know how to count items which meet conditions once I'm in there.
推荐答案
请计数范围
$scope.count = 0;
$scope.selectedIndex = {};
$scope.count = function (index){
$scope.selectedIndex[index] = 1;
updateCount();
}
$scope.uncount = function (index){
delete $scope.selectedIndex[index];
updateCount();
}
function updateCount(){
var element_count =0;
for (e in $scope.selectedIndex)
{
element_count++;
}
$scope.count = element_count;
}
和NG-点击如下
<input type="radio" ng-click="count({{$index}})" name="item{{$index}}" ng-model="selectedVal" value="1" ng-selected="selectedVal==1">
<input type="radio" ng-click="uncount({{$index}})" name="item{{$index}}" ng-model="selectedVal" value="1" ng-selected="selectedVal==1">
在这里显示计数
<div>{{count}} of {{numRequired}}</div>
或您可以直接使用更改计数NG-更改
<input type="radio" ng-change={{count + 1}} name="item{{$index}}" ng-model="selectedVal" value="1" ng-selected="selectedVal==1">
<input type="radio" ng-change={{count -1}} name="item{{$index}}" ng-model="selectedVal" value="1" ng-selected="selectedVal==1">
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