Question

我确定这可能是我愚蠢但我想确认这个问题。我正在构建一个Windows 8应用程序并从mysql服务器加载数据，我似乎无法解决这个问题。从一点点阅读我猜测问题是代码正在执行之前json请求是正确的，有没有办法解决它。返回是因为它在函数内部，它返回数据然后显示它。 “SampleItems [0]”显示完美，但json内部的东西不会，但控制台日志显示它从服务器获取数据。在此先感谢您的帮助！

    var sampleItems = [];
    sampleItems[0] = { group: sampleGroups[count], title: "New Image", subtitle: "", description: "", content: "", backgroundImage: "/images/add.png" };

        //this code calls to our cloud based service which gets the data which is needed and returns it in a JSON object back for this to handle
        $.getJSON('http://pumpstationstudios.com/tumapics/services/getimages.php', function (data) {
            var service_url = 'http://pumpstationstudios.com/tumapics/';
            var count = 1;


            images = data.items;
            $.each(images, function (index, image) {
                image.image = service_url + image.image;
                sampleItems[count] = { group: sampleGroups[count], title: "Hello", subtitle: "", description: "", content: "", backgroundImage: image.image };
                count++;
            });
        });

    return sampleItems;

Answer 1

碰巧，我answered在几个小时之前发现了一个类似的问题javascript code execution and ajax async

基本上，会发生什么

$.getJSON('http://.../getimages.php', function(data) {
// process data
});

// this runs *before* "process data"
return sampleItems;

这意味着，在sampleItems回调函数填充之前，您将返回getJSON。

要解决此问题，您必须在回调函数中进行处理。

JSON问题与执行

1 个答案: