PHPExcel Download and JS returns on form.submit

Question

I'm calling a PHP Script to genereta an excel file and then download it on the fly

 header('Content-Type: application/vnd.ms-excel');
 header("Content-Disposition: attachment;filename=iva.xls");
 $objWriter = new PHPExcel_Writer_Excel5($objPHPExcel); 
 $objWriter->save('php://output');

After this code I finish with:

 $aReturn[]= array('result'=>true);
 exit(json_encode($aReturn));

At the first moment I start calling this PHP using a submit button... then (trying to get a progress bar) I decided to call this php using javascript with following code:

 $.messager.progress(); 
   var urlProtax="taxes/processtax.php?start=" + cStartDate + '&end='+ cEndDate ;
   $('#taxesForm').form('submit',{
         url: urlProtax,
         onSubmit: function(datt){
             var isValid = $(this).form('validate');
             if (!isValid){                           
                 $.messager.progress('close');                         
             }
             return isValid;
         },
         success: function(jdatos){
             alert('alert data '+ jdatos);
             data = eval('('+jdatos+')');
             if(data[0]['result']===true){
                 $.messager.progress('close');
                 $('#taxesWin').window('close');

                 return true;
             }else{
                 $.messager.progress('close');
                 var iderror = data[0]['error'];
                 $.messager.alert("ERROR (" + iderror +")" , gt.gettext('Unknown Error'), 'error'); 
                 $('#taxesWin').window('close');
             }
         },
         error: function(xhr) {
         alert('Error! Status = ' + xhr.status);}

 });

Excel file is being created fine!!! but I never get the json response to close progress bar.

Kind Regards,

Answer 1

Excel files are binary, JSON doesn't support binary formats directly. You might have better luck if you use an ascii format like CSV