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
我认为下面的方法对于嵌套ng-repeat更加清晰和有用。看看普伦克。
引用本文:
<html ng-app="plunker">
<head>
<title>Test</title>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.4/angular.min.js"></script>
</head>
<body ng-controller="MainCtrl">
<div ng-repeat="tab in mytabs">
<h1>{{tab.name}}</h1>
<div ng-repeat="val in tab.values">
<input type="checkbox" ng-change="checkValues()" ng-model="val.checked"/>
</div>
</div>
<br>
<pre> {{selected}} </pre>
<script>
var app = angular.module('plunker', []);
app.controller('MainCtrl', function ($scope,$filter) {
$scope.mytabs = [
{
name: "tab1",
values: [
{ value: "value1",checked:false },
{ value: "value2", checked: false },
{ value: "value3", checked: false },
{ value: "value4", checked: false }
]
},
{
name: "tab2",
values: [
{ value: "value1", checked: false },
{ value: "value2", checked: false },
{ value: "value3", checked: false },
{ value: "value4", checked: false }
]
}
]
$scope.selected = []
$scope.checkValues = function () {
angular.forEach($scope.mytabs, function (value, index) {
var selectedItems = $filter('filter')(value.values, { checked: true });
angular.forEach(selectedItems, function (value, index) {
$scope.selected.push(value);
});
});
console.log($scope.selected);
};
});
</script>
</body>
</html>
其他回答
这里有一个快速的可重用的小指令，它似乎可以做你想做的事情。我简单地称之为清单。它在复选框更改时更新数组，并在数组更改时更新复选框。
app.directive('checkList', function() {
return {
scope: {
list: '=checkList',
value: '@'
},
link: function(scope, elem, attrs) {
var handler = function(setup) {
var checked = elem.prop('checked');
var index = scope.list.indexOf(scope.value);
if (checked && index == -1) {
if (setup) elem.prop('checked', false);
else scope.list.push(scope.value);
} else if (!checked && index != -1) {
if (setup) elem.prop('checked', true);
else scope.list.splice(index, 1);
}
};
var setupHandler = handler.bind(null, true);
var changeHandler = handler.bind(null, false);
elem.bind('change', function() {
scope.$apply(changeHandler);
});
scope.$watch('list', setupHandler, true);
}
};
});
这里有一个控制器和一个显示如何使用它的视图。
<div ng-app="myApp" ng-controller='MainController'>
<span ng-repeat="fruit in fruits">
<input type='checkbox' value="{{fruit}}" check-list='checked_fruits'> {{fruit}}<br />
</span>
<div>The following fruits are checked: {{checked_fruits | json}}</div>
<div>Add fruit to the array manually:
<button ng-repeat="fruit in fruits" ng-click='addFruit(fruit)'>{{fruit}}</button>
</div>
</div>
app.controller('MainController', function($scope) {
$scope.fruits = ['apple', 'orange', 'pear', 'naartjie'];
$scope.checked_fruits = ['apple', 'pear'];
$scope.addFruit = function(fruit) {
if ($scope.checked_fruits.indexOf(fruit) != -1) return;
$scope.checked_fruits.push(fruit);
};
});
(这些按钮演示了更改数组也会更新复选框。)
最后，这里有一个关于Plunker指令的例子:http://plnkr.co/edit/3YNLsyoG4PIBW6Kj7dRK?p=preview
有两种方法可以解决这个问题。要么使用简单数组，要么使用对象数组。每种解决方案都有其优缺点。下面你将为每种情况找到一个解决方案。
使用简单数组作为输入数据
HTML可以是这样的:
<label ng-repeat="fruitName in fruits">
<input
type="checkbox"
name="selectedFruits[]"
value="{{fruitName}}"
ng-checked="selection.indexOf(fruitName) > -1"
ng-click="toggleSelection(fruitName)"
> {{fruitName}}
</label>
适当的控制器代码是:
app.controller('SimpleArrayCtrl', ['$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) {
$scope.selection = nv.map(function (fruit) {
return fruit.name;
});
}, true);
}]);
优点:添加/删除非常容易
缺点:有些复杂的数据结构和切换名称是麻烦的或需要一个帮助方法
演示:http://jsbin.com/ImAqUC/1/
这里是相同的jsFillde链接，http://jsfiddle.net/techno2mahi/Lfw96ja6/。
这使用了可以在http://vitalets.github.io/checklist-model/上下载的指令。
这是有指令的好处，因为你的应用程序会经常需要这个功能。
代码如下:
HTML:
<div class="container">
<div class="ng-scope" ng-app="app" ng-controller="Ctrl1">
<div class="col-xs-12 col-sm-6">
<h3>Multi Checkbox List Demo</h3>
<div class="well"> <!-- ngRepeat: role in roles -->
<label ng-repeat="role in roles">
<input type="checkbox" checklist-model="user.roles" checklist-value="role"> {{role}}
</label>
</div>
<br>
<button ng-click="checkAll()">check all</button>
<button ng-click="uncheckAll()">uncheck all</button>
<button ng-click="checkFirst()">check first</button>
<div>
<h3>Selected User Roles </h3>
<pre class="ng-binding">{{user.roles|json}}</pre>
</div>
<br>
<div><b/>Provided by techno2Mahi</b></div>
</div>
JavaScript
var app = angular.module("app", ["checklist-model"]);
app.controller('Ctrl1', function($scope) {
$scope.roles = [
'guest',
'user',
'customer',
'admin'
];
$scope.user = {
roles: ['user']
};
$scope.checkAll = function() {
$scope.user.roles = angular.copy($scope.roles);
};
$scope.uncheckAll = function() {
$scope.user.roles = [];
};
$scope.checkFirst = function() {
$scope.user.roles.splice(0, $scope.user.roles.length);
$scope.user.roles.push('guest');
};
});
有一种方法可以通过ng-model-options="{getterSetter: true}"直接处理数组并同时使用ng-model。
诀窍是在ng-model中使用getter/setter函数。通过这种方式，你可以使用一个数组作为你的真实模型，并“伪造”输入模型中的布尔值:
<label ng-repeat="fruitName in ['apple', 'orange', 'pear', 'naartjie']">
<input
type="checkbox"
ng-model="fruitsGetterSetterGenerator(fruitName)"
ng-model-options="{ getterSetter: true }"
> {{fruitName}}
</label>
$scope.fruits = ['apple', 'pear']; // pre checked
$scope.fruitsGetterSetterGenerator = function(fruitName){
return function myGetterSetter(nowHasFruit){
if (nowHasFruit !== undefined){
// Setter
fruitIndex = $scope.fruits.indexOf(fruit);
didHaveFruit = (fruitIndex !== -1);
mustAdd = (!didHaveFruit && nowHasFruit);
mustDel = (didHaveFruit && !nowHasFruit);
if (mustAdd){
$scope.fruits.push(fruit);
}
if (mustDel){
$scope.fruits.splice(fruitIndex, 1);
}
}
else {
// Getter
return $scope.user.fruits.indexOf(fruit) !== -1;
}
}
}
注意:如果你的数组很大，你不应该使用这个方法，因为myGetterSetter会被调用很多次。
要了解更多信息，请参见https://docs.angularjs.org/api/ng/directive/ngModelOptions。
这里还有另一个解决方案。我的解决方案的好处是:
它不需要任何额外的手表(这可能会影响性能) 它不需要控制器中的任何代码来保持干净 代码仍然有些短 它只需要很少的代码就可以在多个地方重用，因为它只是一个指令
下面是指令:
function ensureArray(o) {
var lAngular = angular;
if (lAngular.isArray(o) || o === null || lAngular.isUndefined(o)) {
return o;
}
return [o];
}
function checkboxArraySetDirective() {
return {
restrict: 'A',
require: 'ngModel',
link: function(scope, element, attrs, ngModel) {
var name = attrs.checkboxArraySet;
ngModel.$formatters.push(function(value) {
return (ensureArray(value) || []).indexOf(name) >= 0;
});
ngModel.$parsers.push(function(value) {
var modelValue = ensureArray(ngModel.$modelValue) || [],
oldPos = modelValue.indexOf(name),
wasSet = oldPos >= 0;
if (value) {
if (!wasSet) {
modelValue = angular.copy(modelValue);
modelValue.push(name);
}
} else if (wasSet) {
modelValue = angular.copy(modelValue);
modelValue.splice(oldPos, 1);
}
return modelValue;
});
}
}
}
最后就像这样使用它:
<input ng-repeat="fruit in ['apple', 'banana', '...']" type="checkbox" ng-model="fruits" checkbox-array-set="{{fruit}}" />
这就是全部了。唯一增加的是复选框-数组-set属性。
