选中/取消选中所有复选框 - AngularJS ng-repeat

Question

我的结构如下所示：http://jsfiddle.net/deeptechtons/TKVH6/

<div>
<ul ng-controller="checkboxController">
    <li>Check All
        <input type="checkbox" ng-model="selectedAll" ng-click="checkAll()" />
    </li>
    <li ng-repeat="item in Items">
        <label>{{item.Name}}
            <input type="checkbox" ng-model="item.Selected" />
        </label>
    </li>
</ul>
</div>

angular.module("CheckAllModule", [])
.controller("checkboxController", function checkboxController($scope) {


$scope.Items = [{
    Name: "Item one"
}, {
    Name: "Item two"
}, {
    Name: "Item three"
}];
$scope.checkAll = function () {
    if ($scope.selectedAll) {
        $scope.selectedAll = true;
    } else {
        $scope.selectedAll = false;
    }
    angular.forEach($scope.Items, function (item) {
        item.Selected = $scope.selectedAll;
    });

};


});

选中或取消选中全部选中时，会选中所有其他复选框。但是选择“检查所有”时，我取消选择其中一个项目，我希望“检查所有”以取消选择。

提前致谢！

（PS：感谢 JSFiddle 的 deeptechtons）

Answer 1

此答案与Kmart2k1's answer 具有相似的逻辑。它负责更新ng-repeat 中每个子项的主复选框。我没有使用array.forEach，而是使用array.some 来更快地检查是否有任何 项未被选中。

HTML：

<li ng-repeat="item in Items">
    <label>{{item.Name}}
        <input type="checkbox" ng-model="item.Selected" ng-change="notifyMaster()"/>
    </label>
</li>

Javascript

$scope.notifyMaster = function () {
    $scope.selectedAll = !$scope.Items.some(function (item) {
       return !item.Selected;  //check if ANY are unchecked
    });
}

Forked fiddle

Answer 2

如果您使用的是 Angular 1.3+，您可以使用 ng-model-options 中的 getterSetter 来解决此问题并避免手动跟踪 allSelected 状态

HTML：

<input type="checkbox" ng-model="allSelected" ng-model-options="{getterSetter: true}"/>

JS：

var getAllSelected = function () {
    var selectedItems = $scope.Items.filter(function (item) {
        return item.Selected;
    });

    return selectedItems.length === $scope.Items.length;
}

var setAllSelected = function (value) {
    angular.forEach($scope.Items, function (item) {
        item.Selected = value;
    });
}

$scope.allSelected = function (value) {
    if (value !== undefined) {
        return setAllSelected(value);
    } else {
        return getAllSelected();
    }
}

http://jsfiddle.net/2jm6x4co/

Answer 3

这是一个巧妙的小方法

http://jsfiddle.net/TKVH6/850/

使用一点 undescore（只是 reduce）和 ng-checked

  <input type="checkbox" ng-model="selectedAll" ng-click="checkAll()" ng-checked="allSelected()"/>


   $scope.allSelected = function () {
      var allSelect = _.reduce($scope.Items, function (memo, todo) {
          return memo + (todo.Selected ? 1 : 0);
        }, 0);
      return (allSelect === $scope.Items.length);
  };

如果您不想使用下划线，可以使用 .reduce 中内置的 javascript。

Answer 4

您可以使用此功能检查是否在复选框更改时检查了所有记录：

$scope.checkStatus= function() {
            var checkCount = 0;
            angular.forEach($scope.Items, function(item) {
                 if(item.Selected) checkCount++;
            });
                $scope.selectedAll = ( checkCount === $scope.Items.length);
        };

查看代码：

<input type="checkbox" ng-model="item.Selected" ng-change="checkStatus();"/>

http://jsfiddle.net/TKVH6/840/

Answer 5

工作示例： http://jsfiddle.net/egrendon/TKVH6/845/

查看：

<input type="checkbox" ng-model="item.Selected" ng-click="setCheckAll(item)" />

控制器：

angular.module("CheckAllModule", [])
    .controller("checkboxController", function checkboxController($scope) {


    $scope.Items = [{
        Name: "Item one"
    }, {
        Name: "Item two"
    }, {
        Name: "Item three"
    }];
    $scope.checkAll = function () {
        if ($scope.selectedAll) {
            $scope.selectedAll = true;
        } else {
            $scope.selectedAll = false;
        }
        angular.forEach($scope.Items, function (item) {
            item.Selected = $scope.selectedAll;
        });

    };

    $scope.setCheckAll = function (item) {
        //
        // Check if checkAll should be unchecked
        //
        if ($scope.selectedAll && !item.Selected) {
            $scope.selectedAll = false;
        } 
        //
        // Check if all are checked.
        //
        var checkCount = 0;
        angular.forEach($scope.Items, function(item) {
            if(item.Selected) checkCount++;
        });
        $scope.selectedAll = ( checkCount === $scope.Items.length);
    };

});