我有几个复选框:
<input type='checkbox' value="apple" checked> <input type='checkbox' value="orange"> <input type='checkbox' value="pear" checked> <input type='checkbox' value="naartjie">
我想绑定到控制器中的列表,以便每当更改复选框时,控制器都维护所有检查值的列表,例如['apple', 'pear']。
['apple', 'pear']
ng-model似乎只能将一个复选框的值绑定到控制器中的变量。
还有另一种方法可以使四个复选框绑定到控制器中的列表吗?
有两种方法可以解决此问题。使用简单数组或对象数组。每个解决方案都有其优缺点。您会在下面找到每种情况的一种。
HTML可能如下所示:
<label ng-repeat="fruitName in fruits"> <input type="checkbox" name="selectedFruits[]" value="{{fruitName}}" ng-checked="selection.indexOf(fruitName) > -1" ng-click="toggleSelection(fruitName)" > {{fruitName}} </label>
适当的控制器代码为:
app.controller('SimpleArrayCtrl', ['$scope', function SimpleArrayCtrl($scope) { // Fruits $scope.fruits = ['apple', 'orange', 'pear', 'naartjie']; // Selected fruits $scope.selection = ['apple', 'pear']; // Toggle selection for a given fruit by name $scope.toggleSelection = function toggleSelection(fruitName) { var idx = $scope.selection.indexOf(fruitName); // Is currently selected if (idx > -1) { $scope.selection.splice(idx, 1); } // Is newly selected else { $scope.selection.push(fruitName); } }; }]);
优点 :简单的数据结构和按名称切换很容易处理
缺点 :添加/删除很麻烦,因为必须管理两个列表(输入和选择)
<label ng-repeat="fruit in fruits"> <!-- - Use `value="{{fruit.name}}"` to give the input a real value, in case the form gets submitted traditionally - Use `ng-checked="fruit.selected"` to have the checkbox checked based on some angular expression (no two-way-data-binding) - Use `ng-model="fruit.selected"` to utilize two-way-data-binding. Note that `.selected` is arbitrary. The property name could be anything and will be created on the object if not present. --> <input type="checkbox" name="selectedFruits[]" value="{{fruit.name}}" ng-model="fruit.selected" > {{fruit.name}} </label>
app.controller('ObjectArrayCtrl', ['$scope', 'filterFilter', function ObjectArrayCtrl($scope, filterFilter) { // Fruits $scope.fruits = [ { name: 'apple', selected: true }, { name: 'orange', selected: false }, { name: 'pear', selected: true }, { name: 'naartjie', selected: false } ]; // Selected fruits $scope.selection = []; // Helper method to get selected fruits $scope.selectedFruits = function selectedFruits() { return filterFilter($scope.fruits, { selected: true }); }; // Watch fruits for changes $scope.$watch('fruits|filter:{selected:true}', function (nv) { $scope.selection = nv.map(function (fruit) { return fruit.name; }); }, true); }]);
优点 :添加/删除非常容易
缺点 :更复杂的数据结构和按名称切换很麻烦或需要辅助方法