JSON output from PHP using d3.json

Question

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?

Your JSON is invalid. How are you producing this JSON? Your last object in the array is missing a quote. — Brad
– Brad, Commented May 12, 2013 at 21:33

ben schwartz · Accepted Answer · 2013-05-12 22:30:49Z

2

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

answered May 12, 2013 at 22:30

ben schwartz

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user1890328 · Accepted Answer · 2013-05-12 21:34:26Z

-1

you would need to write links = [{"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"}]

At that point links will hold that information. You may however want to consider an array.

answered May 12, 2013 at 21:34

user1890328

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Zero Over a year ago

i need to use the json output from php file!

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