d3.json调用总是获取空数据 [英] d3.json call always gets null data

问题描述

如果我通过浏览器拨打此服务器： http：// localhost： 8080 / api / items / number / all.json 或从curl（curl -G http：// localhost：8080 / api / items / number / all.json ）我回到以下json：

If I make this call to the server from a browser: http://localhost:8080/api/items/number/all.json or from curl (curl -G http://localhost:8080/api/items/number/all.json) I get back the following json:

{
"language":null,
"number":10,
"queryId":0,
"from":null,
"to":null,
"percentage":33,
"dataInfoSet":null
}

$ b b

但是，当我使用d3.json调用：

However when I use d3.json call:

d3.json("http://localhost:8080/api/items/number/all.json", function(jsondata){
            console.log(jsondata);
});

console.log的输出为空。

the output from console.log is null.

如果改为使用http调用，我将json保存在文件（fileWithData.json）中并执行：

If instead the http call, I save the json in a file (fileWithData.json) and do:

d3.json("fileWithData.json", function(jsondata){
                console.log(jsondata);
});

一切正常。有人知道可能是什么问题？

Everything works as expected. Does anyone know what might be the problem?

推荐答案

在d3-js Goole组的帮助下解决。
问题是，加载json的页面不是从localhost：8080提供的，因此，存在跨域限制。我刚刚在同一个应用程序中部署了该文件。
如果必须进行跨域调用，组建议使用jasonp和特别和CORS（
http://www.nczonline.net/blog/2010/05/25/cross-domain-ajax-与跨源起源资源共享/
）

Solved with the help of d3-js Goole group. The problem was that the page loading the json was not being served from localhost:8080, thus, there were cross domain restrictions. I just deployed the file within the same application. In case cross domain calls have to be made, the group suggested the use of jasonp and specially and CORS ( http://www.nczonline.net/blog/2010/05/25/cross-domain-ajax-with-cross-origin-resource-sharing/ )

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