I found the solution: myPostData=jQuery(“#mygrid”).getPostData()) gives me the data posted by jqgrid.

If anyone is interested in using this with jpgraph one should consider that it is hard to send via 'POST' to jpgraph.

Instead it is easy to use 'GET':

jQuery('#my HtmlElement').html('');

where getRequest can be obtained from myPostData the following way:

getRequest='?'+concatObject(myPostData);

with