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
我改编了Yoshi接受的答案来处理复杂的对象(而不是字符串)。
HTML
<div ng-controller="TestController">
<p ng-repeat="permission in allPermissions">
<input type="checkbox" ng-checked="selectedPermissions.containsObjectWithProperty('id', permission.id)" ng-click="toggleSelection(permission)" />
{{permission.name}}
</p>
<hr />
<p>allPermissions: | <span ng-repeat="permission in allPermissions">{{permission.name}} | </span></p>
<p>selectedPermissions: | <span ng-repeat="permission in selectedPermissions">{{permission.name}} | </span></p>
</div>
JavaScript
Array.prototype.indexOfObjectWithProperty = function(propertyName, propertyValue)
{
for (var i = 0, len = this.length; i < len; i++) {
if (this[i][propertyName] === propertyValue) return i;
}
return -1;
};
Array.prototype.containsObjectWithProperty = function(propertyName, propertyValue)
{
return this.indexOfObjectWithProperty(propertyName, propertyValue) != -1;
};
function TestController($scope)
{
$scope.allPermissions = [
{ "id" : 1, "name" : "ROLE_USER" },
{ "id" : 2, "name" : "ROLE_ADMIN" },
{ "id" : 3, "name" : "ROLE_READ" },
{ "id" : 4, "name" : "ROLE_WRITE" } ];
$scope.selectedPermissions = [
{ "id" : 1, "name" : "ROLE_USER" },
{ "id" : 3, "name" : "ROLE_READ" } ];
$scope.toggleSelection = function toggleSelection(permission) {
var index = $scope.selectedPermissions.indexOfObjectWithProperty('id', permission.id);
if (index > -1) {
$scope.selectedPermissions.splice(index, 1);
} else {
$scope.selectedPermissions.push(permission);
}
};
}
工作示例:http://jsfiddle.net/tCU8v/
其他回答
看看这个:清单模型。
它可以使用JavaScript数组和对象，它可以使用静态HTML复选框，而不需要ng-repeat
<label><input type="checkbox" checklist-model="roles" value="admin"> Administrator</label>
<label><input type="checkbox" checklist-model="roles" value="customer"> Customer</label>
<label><input type="checkbox" checklist-model="roles" value="guest"> Guest</label>
<label><input type="checkbox" checklist-model="roles" value="user"> User</label>
JavaScript方面:
var app = angular.module("app", ["checklist-model"]);
app.controller('Ctrl4a', function($scope) {
$scope.roles = [];
});
有两种方法可以解决这个问题。要么使用简单数组，要么使用对象数组。每种解决方案都有其优缺点。下面你将为每种情况找到一个解决方案。
使用简单数组作为输入数据
HTML可以是这样的:
<label ng-repeat="fruitName in fruits">
<input
type="checkbox"
name="selectedFruits[]"
value="{{fruitName}}"
ng-checked="selection.indexOf(fruitName) > -1"
ng-click="toggleSelection(fruitName)"
> {{fruitName}}
</label>
适当的控制器代码是:
app.controller('SimpleArrayCtrl', ['$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;
$scope.checked_fruits.push(fruit);
};
});
(这些按钮演示了更改数组也会更新复选框。)
最后，这里有一个关于Plunker指令的例子:http://plnkr.co/edit/3YNLsyoG4PIBW6Kj7dRK?p=preview
我认为下面的方法对于嵌套ng-repeat更加清晰和有用。看看普伦克。
引用本文:
<html ng-app="plunker">
<head>
<title>Test</title>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.4/angular.min.js"></script>
</head>
<body ng-controller="MainCtrl">
<div ng-repeat="tab in mytabs">
<h1>{{tab.name}}</h1>
<div ng-repeat="val in tab.values">
<input type="checkbox" ng-change="checkValues()" ng-model="val.checked"/>
</div>
</div>
<br>
<pre> {{selected}} </pre>
<script>
var app = angular.module('plunker', []);
app.controller('MainCtrl', function ($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>
<div ng-app='app' >
<div ng-controller='MainCtrl' >
<ul>
<li ng-repeat="tab in data">
<input type='checkbox' ng-click='change($index,confirm)' ng-model='confirm' />
{{tab.name}}
</li>
</ul>
{{val}}
</div>
</div>
var app = angular.module('app', []);
app.controller('MainCtrl',function($scope){
$scope.val=[];
$scope.confirm=false;
$scope.data=[
{
name:'vijay'
},
{
name:'krishna'
},{
name:'Nikhil'
}
];
$scope.temp;
$scope.change=function(index,confirm){
console.log(confirm);
if(!confirm){
($scope.val).push($scope.data[index]);
}
else{
$scope.temp=$scope.data[index];
var d=($scope.val).indexOf($scope.temp);
if(d!=undefined){
($scope.val).splice(d,1);
}
}
}
})
