Save JSON from Openlayers using AJAX

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I am trying to build a web app where users can use OpenLayers to draw features and then save them either as a download or write to a file on the server which I can collect when I need it. I am happy with the OL3 bit so far. From reading around it seems AJAX is the way to do this so I have managed to included a button in my HMTL which runs a function that runs a php file to create a new file.I was pretty happy that I managed to get an empty text file as a start. So how do I get that file to contain the JSON information? I assume I need to send it from the JS world to PHP somehow?

The Function

function loadXMLDoc(){var xmlhttp=new XMLHttpRequest();xmlhttp.open("GET","run.php",true);xmlhttp.send();}The button

do somethingThe PHP file (run.php)

I don't have a geoserver and don't think it is really necessary for something simple like this, using .geojson files seems to be working so far.



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