java - Show a 'Please wait' alert on JSP when button is clicked. when the processing is complete on servlet, remove the alert -


my jsp page ondownload function calls servlet function below.i show alert 'please wait' when download button clicked.. when processing complete on servlet, close alert.

jsp code:

    function ondownload(){         var dtype = 'download';         var url = "<%=strdownloadurltest%>"+"/downloadservlet?downloadtype="+dtype+"&pnumber="+'<%=custpno%>';         document.getelementbyid('downloadp').href = url;         document.getelementbyid('downloadp').target='_blank';     }

processing @ servlet side, code:

        byte content[]=null;     try     {   getpdao getpdao= new getpdao();            for(int i=0;i<5;i++)           {               content=getpdao.getpfromeb( strpn);                dateformat df = new simpledateformat("dd/mm/yy hh:mm:ss");                date dateobj = new date();              content=null;              if(content==null)                 {                    thread.sleep(5000);               }              else {                  content=getpdao.getpfromeb( strpn);                  break;              }           }

finally have agreed use ajax (after not find other way round) response servlet below. i'm using ajax first time. have added below code in jsp , servlet code remains same before. please suggest if done correctly? 

$.ajax({     type: 'post',     url: '"<%=strdownloadurltest%>"+"/downloaddocservlet?downloadtype="+dtype+"&pnumber="+"<%=custpno%>"',     data: {         name: $('#dtype').val()     },     beforesend:function(){     alert("please wait.....");         // append loading image     },     success:function(responsetext){     alert.close();         // successful request; data                 },     error:function(){         // failed request; give feedback user     } });

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