One for you .asp or java boys
13 May 2003, 08:19 PM
#1
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OK this is what I want to do..
I have a asp page that executes on the server and punts out the results to a web page on a clients browser.. The asp page takes some time to execute so currently the client browser reports the start of the processing and then the result after a lengthy wait..
So what i want to do is to have a real time progress bar on the client browser relaying how far in percent the asp process is along.
Can this be done, is it simple, quick, easy ?
I'm only interested on this working on IE 5+ and i dont want to have any components required on the client or server end if poss..
cheers if you can help
I have a asp page that executes on the server and punts out the results to a web page on a clients browser.. The asp page takes some time to execute so currently the client browser reports the start of the processing and then the result after a lengthy wait..
So what i want to do is to have a real time progress bar on the client browser relaying how far in percent the asp process is along.
Can this be done, is it simple, quick, easy ?
I'm only interested on this working on IE 5+ and i dont want to have any components required on the client or server end if poss..
cheers if you can help
13 May 2003, 09:05 PM
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Don't know about ASP or JAVA but can certainly be done if you build an ISAPI application (I use Delphi).
However, I do not think it is specific to ISAPI so I'm guessing it can be done in ASP.
The way I do it is to "hold" the connection open and send progress info back to the browser as the job progresses. OK, I have it just as text that appears to say "20% Complete" etc. but with that you could easily bang together a progress bar built up using static image files.
By holding it open I mean as soon as the request comes in, you start to send progress info back straight away. Normally, the browser would just wait until you send a whole page back.
I don't know if any of the following will help you, but here is a little bit of Delphi that might help, or at least point you in the right direction:
Request Routine
begin
// Force browser to start listening as soon as request comes in
Response.SendResponse;
// Start sending stuff back straight away. Create top of document
MyStr := '<HTML><HEAD><HEAD><BODY>' ;
// Write it to waiting browser
Request.WriteString(MyStr);
// Start the main progressing
// Output that we are at 20%
MyStr := '20% Complete<BR>';
Request.WriteString(MyStr);
{Lots of processing in here that takes time}
// Output that we are at 40%
MyStr := '40% Complete<BR>';
Request.WriteString(MyStr);
{Lots of processing in here that takes time}
// Output that we are at 60%
MyStr := '60% Complete<BR>';
Request.WriteString(MyStr);
{Lots of processing in here that takes time}
// Output that we are at 80%
MyStr := '80% Complete<BR>';
Request.WriteString(MyStr);
{Lots of processing in here that takes time}
// Output that we are at 100%
MyStr := '100% Complete<BR>';
Request.WriteString(MyStr);
// OK, we are done, finish the document
MyStr := '</BODY></HTML>';
Request.WriteString(MyStr);
end;
I.e you are always dribbling the response back to the browser during the processing rather than just sending one bit page after processing.
Cheers
Ian
[Edited by IWatkins - 5/13/2003 9:07:12 PM]
However, I do not think it is specific to ISAPI so I'm guessing it can be done in ASP.
The way I do it is to "hold" the connection open and send progress info back to the browser as the job progresses. OK, I have it just as text that appears to say "20% Complete" etc. but with that you could easily bang together a progress bar built up using static image files.
By holding it open I mean as soon as the request comes in, you start to send progress info back straight away. Normally, the browser would just wait until you send a whole page back.
I don't know if any of the following will help you, but here is a little bit of Delphi that might help, or at least point you in the right direction:
Request Routine
begin
// Force browser to start listening as soon as request comes in
Response.SendResponse;
// Start sending stuff back straight away. Create top of document
MyStr := '<HTML><HEAD><HEAD><BODY>' ;
// Write it to waiting browser
Request.WriteString(MyStr);
// Start the main progressing
// Output that we are at 20%
MyStr := '20% Complete<BR>';
Request.WriteString(MyStr);
{Lots of processing in here that takes time}
// Output that we are at 40%
MyStr := '40% Complete<BR>';
Request.WriteString(MyStr);
{Lots of processing in here that takes time}
// Output that we are at 60%
MyStr := '60% Complete<BR>';
Request.WriteString(MyStr);
{Lots of processing in here that takes time}
// Output that we are at 80%
MyStr := '80% Complete<BR>';
Request.WriteString(MyStr);
{Lots of processing in here that takes time}
// Output that we are at 100%
MyStr := '100% Complete<BR>';
Request.WriteString(MyStr);
// OK, we are done, finish the document
MyStr := '</BODY></HTML>';
Request.WriteString(MyStr);
end;
I.e you are always dribbling the response back to the browser during the processing rather than just sending one bit page after processing.
Cheers
Ian
[Edited by IWatkins - 5/13/2003 9:07:12 PM]
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