ajax - Error handling with Javascript-enabled WCF? -

is there documentation on how use callback functions in wcf service exposed javascript? i'm interested in getting information failurecallback why method isn't firing.

in other words have follwoing javascript code:

     function getwcf_rownumber(parentid) {               logevent("<strong>busy</strong>: please wait while lower grid refreshed...");                                 var service = new ajaxtest();               service.vendor_getparentrownumber(parentid, movebottomgridtorow, wcffailcallback, null);           } 

how implement wcffailcallback?

i'm assuming you're using asp.net ajax , not jquery or other 3rd party javascript library.

the asp.net ajax failure callback takes single parameter. msdn, sample failure callback this:

function wcffailcallback(error) {     var stacktrace = error.get_stacktrace();     var message = error.get_message();     var statuscode = error.get_statuscode();     var exceptiontype = error.get_exceptiontype();     var timedout = error.get_timedout();      // display error.         var rsltelem =          document.getelementbyid("results");     rsltelem.innerhtml =          "stack trace: " +  stacktrace + "<br/>" +         "service error: " + message + "<br/>" +         "status code: " + statuscode + "<br/>" +         "exception type: " + exceptiontype + "<br/>" +         "timedout: " + timedout; } 

so wcffailcallback function takes error parameter, has number of properties provide information failed.

the full article on msdn here. goes decent amount of details how hook wcf services asp.net ajax clients.

i hope helps!! if there other questions or if didn't understand question, let me know , i'll update answer accordingly.