带有自定义回调的 Angular 服务 JSONP 请求 [英] Angular Service JSONP Request with Custom Callback

问题描述

我从具有自定义回调函数的 JSONP 提要中提取，例如:

I'm pulling from JSONP feeds that have custom callback functions, for example:

jsonpCallbackAllStar2015({
    "events": [
        {
            "title": "XYZ"
        }
        ...
    ]
})

我可以使用此处发布的解决方案来做到这一点:

I'm able to do this, using the solution posted here like so:

var jsonUrl = 'http://i.cdn.turner.com/nba/nba/.element/media/2.0/teamsites/warriors/json/json-as2015.js?callback=JSON_CALLBACK' + (new Date().getTime());

$http.jsonp(jsonUrl);

window.jsonpCallbackAllStar2015 = function(data) {
    $scope.events = data.events;
}

但是，我现在想在服务中执行此操作，以便我可以一次性加载数据并将其注入到我的所有控制器中.然而，当我尝试这个时，我得到一个 $injector undefined 错误，我我猜是因为服务返回的速度不够快:

However I would now like to do this in a service so that I can load the data one time and inject it into all of my controllers. When I try this, however, I get an $injector undefined error, which I'm guessing is because the service doesn't return fast enough:

eventsFactory.$inject = ['$http'];
function eventsFactory($http) {
    var jsonUrl = 'http://i.cdn.turner.com/nba/nba/.element/media/2.0/teamsites/warriors/json/json-as2015.js?callback=JSON_CALLBACK' + (new Date().getTime());

    $http.jsonp(jsonUrl);

    window.jsonpCallbackAllStar2015 = function(data) {
        return data.events;
    }
}

有没有办法解决这个问题，还是我必须在每个控制器中重复 jsonp 请求?这是一个小提琴.

Is there anyway to fix this or will I have to repeat the jsonp request in each controller? Here is a fiddle.

推荐答案

虽然它不是一个漂亮的解决方案，但它应该适合您.我添加了一些非常基本的缓存.我没有在 angular 中使用过 jsonp，似乎在 $http 配置中设置缓存不起作用.这本来是一个更好的选择.

While it's not a beautiful solution this should work for you. I added in some very basic caching. I haven't used jsonp in angular and it seems that setting the cache in the $http config doesn't work. It would have been a better option.

app.factory('eventsFactory', [ '$http', '$q', 
    function( $http, $q ) {

        var pub = {};

        var jsonUrl = 'http://i.cdn.turner.com/nba/nba/.element/media/2.0/teamsites/warriors/json/json-as2015.js?callback=JSON_CALLBACK' + (new Date().getTime()),
            cachedResponse;

        pub.getEvent = function() {

            var deferred = $q.defer();

            if ( cachedResponse ) {
                deferred.resolve( cachedResponse );
            }

            else {

                $http.jsonp( jsonUrl );

                window.jsonpCallbackAllStar2015 = function( data ) {
                    cachedResponse = data;
                    deferred.resolve( data );
                }

            }

            return deferred.promise;

        };

        return pub;

    }
]);

现在在你的控制器里面你可以这样做:

Now inside of your controller you can do this:

app.controller('someController', [ 'eventsFactory', 
    function( eventsFactory) {

        eventsFactory.getEvent().then(function( data ) {
            console.log( data );
        });

    }
]);

这篇关于带有自定义回调的 Angular 服务 JSONP 请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！