Check / Uncheck All checkboxes - AngularJS ng-repeat
I have a structure that looks like this: 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;
});
};
});
When all checkboxes are selected or deselected, all other checkboxes are selected. But when Check All is selected and I deselect one of the items, I want Check All to be deselected.
Thanks in advance!
(PS: Thanks to the dedepts for the JSFiddle)
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If you are using Angular 1.3+ you can use getterSetter
from ng-model-options
to fix this problem and not manually track stateallSelected
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();
}
}
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You can use this function to check if all entries are checked every time a checkbox is changed:
$scope.checkStatus= function() {
var checkCount = 0;
angular.forEach($scope.Items, function(item) {
if(item.Selected) checkCount++;
});
$scope.selectedAll = ( checkCount === $scope.Items.length);
};
View code:
<input type="checkbox" ng-model="item.Selected" ng-change="checkStatus();"/>
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working example: http://jsfiddle.net/egrendon/TKVH6/845/
View:
<input type="checkbox" ng-model="item.Selected" ng-click="setCheckAll(item)" />
controller:
angular.module("CheckAllModule", [])
.controller("checkboxController", function checkboxController($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);
};
});
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Here is an easy way to do it
http://jsfiddle.net/TKVH6/850/
Use a little undescore (shorthand only) and 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);
};
You can use the javascripts built in .reduce if you don't want to use underscore.
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This answer has similar logic to Kmart2k1's answer . It sets itself the task of updating the master checkbox for each child in the ng-repeat
. Instead of using it, array.forEach
I use array.some
to check faster if any of the items are not selected.
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
});
}
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