PennController.GetURLParameter( parametername )
Retrieves the value of a parameter that was passed after
? in the URL. This is particularly useful if you pass a uniquely identifying code to the URL when you recruit your participants, like http://spellout.net/ibexexps/PennController/Demo/experiment.html?id=abcdefgh
newTrial( "my trial" , newButton("helloworld", "Hello world!") .settings.log() .print() .wait() ) .log( "ID" , GetURLParameter( "id" ) );
Will add a column to each result line logged by my trial reporting the value that was passed after
id= in the URL.