我希望仅使用硬编码的 JSON 文件进行本地开发。我的 JSON 文件如下(放入 JSON 验证器时有效):
{
"contentItem": [
{
"contentID" : "1",
"contentVideo" : "file.mov",
"contentThumbnail" : "url.jpg",
"contentRating" : "5",
"contentTitle" : "Guitar Lessons",
"username" : "Username",
"realname" : "Real name",
"contentTags" : [
{ "tag" : "Guitar"},
{ "tag" : "Intermediate"},
{ "tag" : "Chords"}
],
"contentAbout" : "Learn how to play guitar!",
"contentTime" : [
{ "" : "", "" : "", "" : "", "" : ""},
{ "" : "", "" : "", "" : "", "" : ""}
],
"series" :[
{ "seriesVideo" : "file.mov", "seriesThumbnail" : "url.jpg", "seriesTime" : "time", "seriesNumber" : "1", "seriesTitle" : "How to Play Guitar" },
{ "videoFile" : "file.mov", "seriesThumbnail" : "url.jpg", "seriesTime" : "time", "seriesNumber" : "2", "seriesTitle" : "How to Play Guitar" }
]
},{
"contentID" : "2",
"contentVideo" : "file.mov",
"contentThumbnail" : "url.jpg",
"contentRating" : "5",
"contentTitle" : "Guitar Lessons",
"username" : "Username",
"realname" : "Real name",
"contentTags" : [
{ "tag" : "Guitar"},
{ "tag" : "Intermediate"},
{ "tag" : "Chords"}
],
"contentAbout" : "Learn how to play guitar!",
"contentTime" : [
{ "" : "", "" : "", "" : "", "" : ""},
{ "" : "", "" : "", "" : "", "" : ""}
],
"series" :[
{ "seriesVideo" : "file.mov", "seriesThumbnail" : "url.jpg", "seriesTime" : "time", "seriesNumber" : "1", "seriesTitle" : "How to Play Guitar" },
{ "videoFile" : "file.mov", "seriesThumbnail" : "url.jpg", "seriesTime" : "time", "seriesNumber" : "2", "seriesTitle" : "How to Play Guitar" }
]
}
]
}
当 JSON 在工厂内被硬编码时,我的 Controller 、工厂和 html 都可以正常工作。但是,既然我已经用 $http.get 代码替换了 JSON,它就不起作用了。我已经看到了很多 $http 和 $resource 的不同示例,但不知道该去哪里。我正在寻找最简单的解决方案。我只是想为 ng-repeat 和类似指令提取数据。
工厂:
theApp.factory('mainInfoFactory', function($http) {
var mainInfo = $http.get('content.json').success(function(response) {
return response.data;
});
var factory = {}; // define factory object
factory.getMainInfo = function() { // define method on factory object
return mainInfo; // returning data that was pulled in $http call
};
return factory; // returning factory to make it ready to be pulled by the controller
});
我们不胜感激。谢谢!
最佳答案
好的,以下是要调查的事项列表:
1) 如果您没有运行任何类型的网络服务器而只是使用 file://index.html 进行测试,那么您可能会遇到同源策略问题。见:
https://code.google.com/archive/p/browsersec/wikis/Part2.wiki#Same-origin_policy
许多浏览器不允许本地托管的文件访问其他本地托管的文件。 Firefox 确实允许这样做,但前提是您正在加载的文件包含在与 html 文件(或子文件夹)相同的文件夹中。
2) $http.get() 返回的成功函数已经为你拆分了结果对象:
$http({method: 'GET', url: '/someUrl'}).success(function(data, status, headers, config) {
所以用function(response)调用success并返回response.data是多余的。
3) 成功函数不会返回你传递给它的函数的结果,所以这不会做你认为它做的事情:
var mainInfo = $http.get('content.json').success(function(response) {
return response.data;
});
这更接近您的预期:
var mainInfo = null;
$http.get('content.json').success(function(data) {
mainInfo = data;
});
4) 但是您真正想要做的是返回对具有属性的对象的引用,该属性将在数据加载时填充,因此如下所示:
theApp.factory('mainInfo', function($http) {
var obj = {content:null};
$http.get('content.json').success(function(data) {
// you can do some processing here
obj.content = data;
});
return obj;
});
mainInfo.content 会从 null 开始,当数据加载时,它会指向它。
或者,您可以返回 $http.get 返回的实际 promise 并使用它:
theApp.factory('mainInfo', function($http) {
return $http.get('content.json');
});
然后您可以在 Controller 的计算中异步使用该值:
$scope.foo = "Hello World";
mainInfo.success(function(data) {
$scope.foo = "Hello "+data.contentItem[0].username;
});
https://stackoverflow.com/questions/16930473/