(UPDATED) Jquery: trouble with file uploading throught .ajax -

sorry mispellings, english not main language.

i have jquery code in put data in plainobject type variable, use .post method send server.

conj = { form_type : 'event',           event_process_id : '1', //value defined when loading page           event_sequence : '10', //value defined when loading page           event_step : 'value', //value defined when loading page           event_type_id : $('#event_type_id').val(),           event_description : $('#event_description').val(),           event_date : $('#event_date').val(),           mode : 'save'         };    $.post('aux_process_form.asp',         conj ,         function (data) {            $.fulfill_event_information(); //this procedure update                                            //areas of page;                                           //don't worry            alert(data); //alerts user if there success or failure          });

this has worked me, need upload file information.

i've added page, had no success in uploading file successfully.

for instance, tried use $('#event_file').val() in plainobject, seems not work. can me solving or changing code address problem?

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update 11/13/2016

after seeing other similar questions in these forums, found out how attach file, whenever attach file plainobject variable (conj in above example), %.post function won't work.

i tried change code. instead of plainobject store date, tried formdata object. , instead of $.post function, tried $.ajax function. new code this:

var myfile; //will store file name var attachment; //will store file  if ($('#event_file_selected').val() == "1" && $('#event_file').val() != "") {     myfile = $('#event_file').val();     attachment = $('#event_file')[0].files[0]; } else {     myfile = '';     attachment = ''; }  var conj = new formdata(); conj.append('form_type','event'); conj.append('event_process_id','1'); conj.append('event_sequence','10'); conj.append('event_step','value'); conj.append('event_type_id',$('#event_type_id').val()); conj.append('event_description',$('#event_description').val()); conj.append('event_date',$('#event_date').val()); conj.append('mode','save'); conj.append('event_file_selected',$('#event_file_selected').val()); conj.append('event_file',myfile); conj.append('event_attach',attachment);  $.ajax({     url: 'aux_process_form.asp',     type: 'post',     data: conj,     cache: false,     contenttype: false,     processdata: false,     success: function(data){         $.fulfill_event_information();         alert(data);     } }); 

as per other examples in these forums, new code should work. isn't. $.ajax function fire , complete, returning success, it not sending data server.

things have tried: - using plainobject send data throught .ajax function. same result: no data being sent. - using formdata variable .post function. didn't work, code stops working.

i have no idea why data not being sent. said above, when use .post method, works long there's no file attached. .ajax method not working how should.

does have advice?