我正在学习AngularJS。我尝试创建一个名为。
的可重用组件不幸的是,我不能用从JSON获得的数据预填充元素内的字段。 我环顾四周和网络,但无法解决它。能不能让我知道我做错了什么?
我有两个控制器。获得所有国家/地区的列表:
app.controller('MainController', ['$scope', 'Countries',
function ($scope, Countries) {
$scope.countries = Countries.query();
}]);
另一个收集了一个具体地址:
app.controller('AddressesController', ['$scope', '$routeParams', 'Address',
function($scope, $routeParams, Address) {
if ($routeParams.addressId) {
$scope.senderAddress = Address.get({addressId: $routeParams.addressId});
} else {
$scope.senderAddress = {"id":null, "country":null, "city":null, "street":null};
}
$scope.adData = {"id": 1, "country": "Poland", "city": "Warsaw", "street": "Nullowska 15"};
}]);
服务定义如下,它们似乎正常工作并提供正确的JSON:
myServices.factory('Countries', ['$resource',
function($resource) {
return $resource('data/countries.json', {}, {
query: {method:'GET'}
})
}]);
myServices.factory('Address', ['$resource',
function($resource) {
return $resource('data/:addressId.json', {}, {
query: {method:'GET', params:{addressId:'addressId'}}
})
}])
我有路由设置,以便它指向AddressesController:
app.config(function ($routeProvider) {
$routeProvider
.when('/address', {
templateUrl: 'partials/addresses.html',
controller: 'AddressesController'
})
.when('/address/:addressId', {
templateUrl: 'partials/addresses2.html',
controller: 'AddressesController'
})
});
局部视图很简单,我创建了2个元素
<label> Sender </label>
<address address-data='{{senderAddress}}'></address> <!-- I tried all combinations of passing this as argument -->
<label> Receiver </label>
<address></address>
现在该指令被声明为:
app.directive("address", function () {
return {
restrict: "E",
templateUrl: "/directives/address.html",
scope: {addrData: '@senderAddress'},
link: function(scope, element, attributes) {
scope.adData = attributes["addressData"];
}
}
});
和它的模板是:
<div>
<label> {{senderAddress}} </label> <!-- senderAddress from Addresses Controller is filled correctly -->
<div>
<label>Country</label>
<select>
<option value=""></option>
<option ng-repeat="country in countries.countries" value="{{country}}">{{country}}</option>
</select>
</div>
<div>
<label>City {{dto.adData.city}}</label>
<input type="text" data-ng-model="dto.adData.city" /> <!-- this I cannot pre-fill -->
</div>
<div>
<label>Street{{data.adData.city}}</label>
<input type="text" data-ng-model="dto.adData.street"> <!-- this I cannot pre-fill -->
</div>
</div>
这一切都在指令之外运作良好。但我想念一些关于如何处理指令内部范围的内容,其中数据是从JSON服务获得的。是否因为创建指令的链接时JSON数据是一个promise对象?如何处理?
PS
我也尝试过观察属性:
link: function(scope, element, attributes) {
//scope.dto.adData = attributes["addressData"];
attrs.$observe('addressData', function(data) {
if (!data)
return;
scope.dto.adData = data;
})
}
即使对于静态定义的数据,它也不起作用:
app.directive("address", function () {
return {
controller: function($scope) {
$scope.dto = {};
$scope.dto.data = {"id": 1, "country": "Poland", "city": "Warsaw", "street": "Nullowska 15"};
},
答案 0 :(得分:1)
传递像这样的JSON并不是我如何做到这一点,因为它在数据绑定中是一种黑客攻击,你可能不会得到双向绑定。我使用isolate scope。
您的指令将在没有把手的情况下使用,以链接范围变量:
<address address-data='senderAddress'></address>
然后您在指令定义中包含scope
选项:
app.directive("address", function () {
return {
restrict: "E",
templateUrl: "/directives/address.html",
scope: {
addressData: '='
}
}
});
裸等号'='
告诉Angular将address-data属性中引用的父作用域变量双重绑定到子作用域变量addressData。这是通过规范化名称&#34;地址数据&#34;自动完成的。进入JS-style&#34; addressData。&#34;如果您想以不同方式命名两个范围变量,则可以改为innerAddressData: '=addressData'
。
如果你这样做,你根本不需要链接功能,绑定仍然有效。
答案 1 :(得分:0)
好的,我解决了,如果有人有类似的问题,可能有助于检查范围是否设置为true并检查JSON是否从字符串解析; - )。
app.directive("address", function () {
return {
restrict: "E",
templateUrl: "/directives/address.html",
scope: true, // creates its own local scope
link: function(scope, element, attributes) {
attributes.$observe('addressData', function(data) {
if (!data)
return;
scope.dto = {};
// works almost fine but in 2nd case data is also filled
scope.dto.adData = angular.fromJson(data);
})
}
}
});