来自PHP的JSON输出使用d3.json [英] JSON output from PHP using d3.json

问题描述

我创建了一个PHP文件来查询JSON输出。特定过滤器testPHP.php？number = 123的PHP文件的JSON输出是

  [{source： AB，target：AC，type：true}，{source：UB，target：EP，type：true}，{source ：US，target：UR，type：lie}，{source：BS，target：QW，type： source：UW，target：EA，type：lie}] 
  
 
 $ b b 
我已经尝试过在html文件中读取JSON输出到链接变量
  var links; // a global 
 d3.json（testPHP.php？number = 123，function（error，json）{
 if（error）return console.warn（error）; 
 links = json; 
}）; 
  
但是，似乎数据不存储在链接中。 
如何将数据存储在 var links ？
 
 
 
基本上， c $ c> var links 在此 https://gist.github.com/ 
 
 
 
编辑：
或 http：// localhost：8080 
解决方案
 d3.json调用是异步的; 
  var links;在回调之前执行的代码在links变量填充之前执行。 // a global 
 d3.json（testPHP.php？number = 123，function（error，json）{
 if（error）return console.warn（error）; 
 links = json; 
 
 console.log（links）; //你的链接在这里填充
 
 //包括你的应用程序的其余部分
}）; 
 
 //链接仍未定义，因为成功回调尚未运行
  
 
I created a PHP file to query JSON output. JSON output from the PHP file for a particular filter "testPHP.php?number=123" is
[{"source":"AB","target":"AC","type":"true"},{"source":"UB","target":"EP","type":"true"},{"source":"US","target":"UR","type":"lie"},{"source":"BS","target":"QW","type":"lie"},{"source":"UW","target":"EA","type":"lie"}]
I have tried this in html file to read the JSON output to links variable
var links; // a global
d3.json("testPHP.php?number=123", function(error, json) {
  if (error) return console.warn(error);
  links = json;
});
But, it seems like data is not stored in links.
How do I store the data in var links?


Basically, I want to replace var links in this https://gist.github.com/mbostock/1153292 to that from JSON output from PHP.

EDIT:
Or http://localhost:8080 is causing the problem?
解决方案
The d3.json call is asynchronous; the code included after your callback is executed before the "links" variable has been populated.
var links; // a global
d3.json("testPHP.php?number=123", function(error, json) {
  if (error) return console.warn(error);
  links = json;

  console.log(links); // your links are populated here

  // include the rest of your app here
});

// links is still undefined here because the success callback hasn't been run yet


                        
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