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?
<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);
}
};
}
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 $scope.user.fruits.indexOf(fruit) !== -1;
}
}
}
注意:如果你的数组很大,你不应该使用这个方法,因为myGetterSetter会被调用很多次。
要了解更多信息,请参见https://docs.angularjs.org/api/ng/directive/ngModelOptions。
我改编了Yoshi接受的答案来处理复杂的对象(而不是字符串)。
HTML
<div ng-controller="TestController">
<p ng-repeat="permission in allPermissions">
<input type="checkbox" ng-checked="selectedPermissions.containsObjectWithProperty('id', permission.id)" ng-click="toggleSelection(permission)" />
{{permission.name}}
</p>
<hr />
<p>allPermissions: | <span ng-repeat="permission in allPermissions">{{permission.name}} | </span></p>
<p>selectedPermissions: | <span ng-repeat="permission in selectedPermissions">{{permission.name}} | </span></p>
</div>
JavaScript
Array.prototype.indexOfObjectWithProperty = function(propertyName, propertyValue)
{
for (var i = 0, len = this.length; i < len; i++) {
if (this[i][propertyName] === propertyValue) return i;
}
return -1;
};
Array.prototype.containsObjectWithProperty = function(propertyName, propertyValue)
{
return this.indexOfObjectWithProperty(propertyName, propertyValue) != -1;
};
function TestController($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 {
$scope.selectedPermissions.push(permission);
}
};
}
工作示例:http://jsfiddle.net/tCU8v/
使用$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。
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