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
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.$modelValue) || [],
oldPos = modelValue.indexOf(name),
wasSet = oldPos >= 0;
if (value) {
if (!wasSet) {
modelValue = angular.copy(modelValue);
modelValue.push(name);
}
} else if (wasSet) {
modelValue = angular.copy(modelValue);
modelValue.splice(oldPos, 1);
}
return modelValue;
});
}
}
}
最后就像这样使用它:
<input ng-repeat="fruit in ['apple', 'banana', '...']" type="checkbox" ng-model="fruits" checkbox-array-set="{{fruit}}" />
这就是全部了。唯一增加的是复选框-数组-set属性。
其他回答
这里是相同的jsFillde链接，http://jsfiddle.net/techno2mahi/Lfw96ja6/。
这使用了可以在http://vitalets.github.io/checklist-model/上下载的指令。
这是有指令的好处，因为你的应用程序会经常需要这个功能。
代码如下:
HTML:
<div class="container">
<div class="ng-scope" ng-app="app" ng-controller="Ctrl1">
<div class="col-xs-12 col-sm-6">
<h3>Multi Checkbox List Demo</h3>
<div class="well"> <!-- ngRepeat: role in roles -->
<label ng-repeat="role in roles">
<input type="checkbox" checklist-model="user.roles" checklist-value="role"> {{role}}
</label>
</div>
<br>
<button ng-click="checkAll()">check all</button>
<button ng-click="uncheckAll()">uncheck all</button>
<button ng-click="checkFirst()">check first</button>
<div>
<h3>Selected User Roles </h3>
<pre class="ng-binding">{{user.roles|json}}</pre>
</div>
<br>
<div><b/>Provided by techno2Mahi</b></div>
</div>
JavaScript
var app = angular.module("app", ["checklist-model"]);
app.controller('Ctrl1', function($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);
$scope.user.roles.push('guest');
};
});
<input type='checkbox' ng-repeat="fruit in fruits"
ng-checked="checkedFruits.indexOf(fruit) != -1" ng-click="toggleCheck(fruit)">
.
function SomeCtrl ($scope) {
$scope.fruits = ["apple, orange, pear, naartjie"];
$scope.checkedFruits = [];
$scope.toggleCheck = function (fruit) {
if ($scope.checkedFruits.indexOf(fruit) === -1) {
$scope.checkedFruits.push(fruit);
} else {
$scope.checkedFruits.splice($scope.checkedFruits.indexOf(fruit), 1);
}
};
}
我喜欢Yoshi的回答。我增强了它，所以你可以对多个列表使用相同的函数。
<label ng-repeat="fruitName in fruits">
<input
type="checkbox"
name="selectedFruits[]"
value="{{fruitName}}"
ng-checked="selection.indexOf(fruitName) > -1"
ng-click="toggleSelection(fruitName, selection)"> {{fruitName}}
</label>
<label ng-repeat="veggieName in veggies">
<input
type="checkbox"
name="selectedVeggies[]"
value="{{veggieName}}"
ng-checked="veggieSelection.indexOf(veggieName) > -1"
ng-click="toggleSelection(veggieName, veggieSelection)"> {{veggieName}}
</label>
app.controller('SimpleArrayCtrl', ['$scope', function SimpleArrayCtrl($scope) {
// fruits
$scope.fruits = ['apple', 'orange', 'pear', 'naartjie'];
$scope.veggies = ['lettuce', 'cabbage', 'tomato']
// selected fruits
$scope.selection = ['apple', 'pear'];
$scope.veggieSelection = ['lettuce']
// toggle selection for a given fruit by name
$scope.toggleSelection = function toggleSelection(selectionName, listSelection) {
var idx = listSelection.indexOf(selectionName);
// is currently selected
if (idx > -1) {
listSelection.splice(idx, 1);
}
// is newly selected
else {
listSelection.push(selectionName);
}
};
}]);
http://plnkr.co/edit/KcbtzEyNMA8s1X7Hja8p?p=preview
有两种方法可以解决这个问题。要么使用简单数组，要么使用对象数组。每种解决方案都有其优缺点。下面你将为每种情况找到一个解决方案。
使用简单数组作为输入数据
HTML可以是这样的:
<label ng-repeat="fruitName in fruits">
<input
type="checkbox"
name="selectedFruits[]"
value="{{fruitName}}"
ng-checked="selection.indexOf(fruitName) > -1"
ng-click="toggleSelection(fruitName)"
> {{fruitName}}
</label>
适当的控制器代码是:
app.controller('SimpleArrayCtrl', ['$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/
根据这个线程中的回答，我创建了涵盖所有情况的清单模型指令:
简单的原语数组 对象数组(选择id或整个对象) 对象属性迭代
对于主题启动案例，它将是:
<label ng-repeat="fruit in ['apple', 'orange', 'pear', 'naartjie']">
<input type="checkbox" checklist-model="selectedFruits" checklist-value="fruit"> {{fruit}}
</label>
