我有一些复选框:
<input type='checkbox' value="apple" checked>
<input type='checkbox' value="orange">
<input type='checkbox' value="pear" checked>
<input type='checkbox' value="naartjie">
我想绑定到我的控制器中的一个列表，这样每当一个复选框被更改时，控制器就会维护一个包含所有选中值的列表，例如，['apple'， 'pear']。
Ng-model似乎只能将一个复选框的值绑定到控制器中的一个变量。
是否有其他方法可以将这四个复选框绑定到控制器中的列表?
当前回答
下面的解决方案似乎是个不错的选择，
<label ng-repeat="fruit in fruits">
<input
type="checkbox"
ng-model="fruit.checked"
ng-value="true"
> {{fruit.fruitName}}
</label>
在控制器模型中，值果实是这样的
$scope.fruits = [
{
"name": "apple",
"checked": true
},
{
"name": "orange"
},
{
"name": "grapes",
"checked": true
}
];
其他回答
有两种方法可以解决这个问题。要么使用简单数组，要么使用对象数组。每种解决方案都有其优缺点。下面你将为每种情况找到一个解决方案。
使用简单数组作为输入数据
HTML可以是这样的:
<label ng-repeat="fruitName in fruits">
<input
type="checkbox"
name="selectedFruits[]"
value="{{fruitName}}"
ng-checked="selection.indexOf(fruitName) > -1"
ng-click="toggleSelection(fruitName)"
> {{fruitName}}
</label>
适当的控制器代码是:
app.controller('SimpleArrayCtrl', ['$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 {
$scope.selection.push(fruitName);
}
};
}]);
优点:简单的数据结构和切换名称容易处理
缺点:添加/删除很麻烦，因为必须管理两个列表(输入和选择)
使用对象数组作为输入数据
HTML可以是这样的:
<label ng-repeat="fruit in fruits">
<!--
- Use `value="{{fruit.name}}"` to give the input a real value, in case the form gets submitted
traditionally
- Use `ng-checked="fruit.selected"` to have the checkbox checked based on some angular expression
(no two-way-data-binding)
- Use `ng-model="fruit.selected"` to utilize two-way-data-binding. Note that `.selected`
is arbitrary. The property name could be anything and will be created on the object if not present.
-->
<input
type="checkbox"
name="selectedFruits[]"
value="{{fruit.name}}"
ng-model="fruit.selected"
> {{fruit.name}}
</label>
适当的控制器代码是:
app.controller('ObjectArrayCtrl', ['$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) {
$scope.selection = nv.map(function (fruit) {
return fruit.name;
});
}, true);
}]);
优点:添加/删除非常容易
缺点:有些复杂的数据结构和切换名称是麻烦的或需要一个帮助方法
演示:http://jsbin.com/ImAqUC/1/
如果在同一个表单上有多个复选框
控制器代码
vm.doYouHaveCheckBox = ['aaa', 'ccc', 'bbb'];
vm.desiredRoutesCheckBox = ['ddd', 'ccc', 'Default'];
vm.doYouHaveCBSelection = [];
vm.desiredRoutesCBSelection = [];
视图代码
<div ng-repeat="doYouHaveOption in vm.doYouHaveCheckBox">
<div class="action-checkbox">
<input id="{{doYouHaveOption}}" type="checkbox" value="{{doYouHaveOption}}" ng-checked="vm.doYouHaveCBSelection.indexOf(doYouHaveOption) > -1" ng-click="vm.toggleSelection(doYouHaveOption,vm.doYouHaveCBSelection)" />
<label for="{{doYouHaveOption}}"></label>
{{doYouHaveOption}}
</div>
</div>
<div ng-repeat="desiredRoutesOption in vm.desiredRoutesCheckBox">
<div class="action-checkbox">
<input id="{{desiredRoutesOption}}" type="checkbox" value="{{desiredRoutesOption}}" ng-checked="vm.desiredRoutesCBSelection.indexOf(desiredRoutesOption) > -1" ng-click="vm.toggleSelection(desiredRoutesOption,vm.desiredRoutesCBSelection)" />
<label for="{{desiredRoutesOption}}"></label>
{{desiredRoutesOption}}
</div>
</div>
一个简单的解决方案:
<div ng-controller="MainCtrl">
<label ng-repeat="(color,enabled) in colors">
<input type="checkbox" ng-model="colors[color]" /> {{color}}
</label>
<p>colors: {{colors}}</p>
</div>
<script>
var app = angular.module('plunker', []);
app.controller('MainCtrl', function($scope){
$scope.colors = {Blue: true, Orange: true};
});
</script>
http://plnkr.co/edit/U4VD61?p=preview
使用$index字符串可以帮助使用选定值的hashmap:
<ul>
<li ng-repeat="someItem in someArray">
<input type="checkbox" ng-model="someObject[$index.toString()]" />
</li>
</ul>
这样ng-model对象就用表示索引的键更新了。
$scope.someObject = {};
一段时间后$scope。someObject应该看起来像这样:
$scope.someObject = {
0: true,
4: false,
1: true
};
这种方法并不适用于所有情况，但很容易实现。
另一个简单的指令可以是:
var appModule = angular.module("appModule", []);
appModule.directive("checkList", [function () {
return {
restrict: "A",
scope: {
selectedItemsArray: "=",
value: "@"
},
link: function (scope, elem) {
scope.$watchCollection("selectedItemsArray", function (newValue) {
if (_.contains(newValue, scope.value)) {
elem.prop("checked", true);
} else {
elem.prop("checked", false);
}
});
if (_.contains(scope.selectedItemsArray, scope.value)) {
elem.prop("checked", true);
}
elem.on("change", function () {
if (elem.prop("checked")) {
if (!_.contains(scope.selectedItemsArray, scope.value)) {
scope.$apply(
function () {
scope.selectedItemsArray.push(scope.value);
}
);
}
} else {
if (_.contains(scope.selectedItemsArray, scope.value)) {
var index = scope.selectedItemsArray.indexOf(scope.value);
scope.$apply(
function () {
scope.selectedItemsArray.splice(index, 1);
});
}
}
console.log(scope.selectedItemsArray);
});
}
};
}]);
控制器:
appModule.controller("sampleController", ["$scope",
function ($scope) {
//#region "Scope Members"
$scope.sourceArray = [{ id: 1, text: "val1" }, { id: 2, text: "val2" }];
$scope.selectedItems = ["1"];
//#endregion
$scope.selectAll = function () {
$scope.selectedItems = ["1", "2"];
};
$scope.unCheckAll = function () {
$scope.selectedItems = [];
};
}]);
而HTML:
<ul class="list-unstyled filter-list">
<li data-ng-repeat="item in sourceArray">
<div class="checkbox">
<label>
<input type="checkbox" check-list selected-items-array="selectedItems" value="{{item.id}}">
{{item.text}}
</label>
</div>
</li>
我还包括一个Plunker: http://plnkr.co/edit/XnFtyij4ed6RyFwnFN6V?p=preview
