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
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) {
$scope.selection = nv.map(function (fruit) {
return fruit.name;
});
}, true);
}]);
优点:添加/删除非常容易
缺点:有些复杂的数据结构和切换名称是麻烦的或需要一个帮助方法
演示:http://jsbin.com/ImAqUC/1/
其他回答
灵感来自Yoshi上面的帖子。 这是钱。
(function () { angular .module("APP", []) .controller("demoCtrl", ["$scope", function ($scope) { var dc = this dc.list = [ "Selection1", "Selection2", "Selection3" ] dc.multipleSelections = [] dc.individualSelections = [] // Using splice and push methods to make use of // the same "selections" object passed by reference to the // addOrRemove function as using "selections = []" // creates a new object within the scope of the // function which doesn't help in two way binding. dc.addOrRemove = function (selectedItems, item, isMultiple) { var itemIndex = selectedItems.indexOf(item) var isPresent = (itemIndex > -1) if (isMultiple) { if (isPresent) { selectedItems.splice(itemIndex, 1) } else { selectedItems.push(item) } } else { if (isPresent) { selectedItems.splice(0, 1) } else { selectedItems.splice(0, 1, item) } } } }]) })() label { display: block; } <!DOCTYPE html> <html> <head> <link rel="stylesheet" href="style.css" /> </head> <body ng-app="APP" ng-controller="demoCtrl as dc"> <h1>checkbox-select demo</h1> <h4>Multiple Selections</h4> <label ng-repeat="thing in dc.list"> <input type="checkbox" ng-checked="dc.multipleSelections.indexOf(thing) > -1" ng-click="dc.addOrRemove(dc.multipleSelections, thing, true)" > {{thing}} </label> <p> dc.multipleSelections :- {{dc.multipleSelections}} </p> <hr> <h4>Individual Selections</h4> <label ng-repeat="thing in dc.list"> <input type="checkbox" ng-checked="dc.individualSelections.indexOf(thing) > -1" ng-click="dc.addOrRemove(dc.individualSelections, thing, false)" > {{thing}} </label> <p> dc.invidualSelections :- {{dc.individualSelections}} </p> <script data-require="jquery@3.0.0" data-semver="3.0.0" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0/jquery.js"></script> <script data-require="angular.js@1.5.6" data-semver="1.5.6" src="https://code.angularjs.org/1.5.6/angular.min.js"></script> <script src="script.js"></script> </body> </html>
我认为最简单的解决方法是使用'select'并指定'multiple':
<select ng-model="selectedfruit" multiple ng-options="v for v in fruit"></select>
否则，我认为您将不得不处理该列表来构造该列表 (通过$watch()用复选框绑定模型数组)。
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:
$scope.someObject = {
0: true,
4: false,
1: true
};
这种方法并不适用于所有情况，但很容易实现。
<div ng-app='app' >
<div ng-controller='MainCtrl' >
<ul>
<li ng-repeat="tab in data">
<input type='checkbox' ng-click='change($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);
}
}
}
})
试试我的宝贝:
**
myApp.filter('inputSelected', function(){
return function(formData){
var keyArr = [];
var word = [];
Object.keys(formData).forEach(function(key){
if (formData[key]){
var keyCap = key.charAt(0).toUpperCase() + key.slice(1);
for (var char = 0; char<keyCap.length; char++ ) {
if (keyCap[char] == keyCap[char].toUpperCase()){
var spacedLetter = ' '+ keyCap[char];
word.push(spacedLetter);
}
else {
word.push(keyCap[char]);
}
}
}
keyArr.push(word.join(''))
word = [];
})
return keyArr.toString();
}
})
**
然后对于任何带有复选框的ng-model，它将返回你选择的所有输入的字符串:
<label for="Heard about ITN">How did you hear about ITN?: *</label><br>
<label class="checkbox-inline"><input ng-model="formData.heardAboutItn.brotherOrSister" type="checkbox" >Brother or Sister</label>
<label class="checkbox-inline"><input ng-model="formData.heardAboutItn.friendOrAcquaintance" type="checkbox" >Friend or Acquaintance</label>
{{formData.heardAboutItn | inputSelected }}
//returns Brother or Sister, Friend or Acquaintance
