Re: uploading files | how to avoid submitting twice?

Jim Winstead wrote: > Andy <news.letters@gmx.de> wrote: >> Is there a way to redirect imediatelly to a waiting page? I tryed to >> redirect, but somehow the server is first uploading the file before >> something else happens. > > unfortunately, no. one thing you can do is use javascript to pop up a > small window in your form's onsubmit method that tells the user to hang > on, and then close that window in the next page's onload method. it > isn't easy to do a real progress meter, but even this little bit should > help tremendously. > > you may also want to check the md5 sum of the file contents against > previous uploads to detect duplicates. > > jim I've never tried it, but it may also be possible to disable the submit button once it has been pressed once to stop the second upload e.g. <HTML> <HEAD> <SCRIPT LANGUAGE=javascript> function submitonce() { if (document.form.submitted.value == "No") { document.form.submitted.value == "Yes"; return true; } else { alert("Please wait..."); return false; } } </SCRIPT> </HEAD> <BODY> <FORM OnSubmit="return submitonce();"> <INPUT TYPE=HIDDEN NAME=submitted VALUE="No"> <INPUT TYPE=FILE NAME=uploadfile> <INPUT TYPE=SUBMIT OnClick="return submitonce();"> </FORM> </BODY> </HTML> N.B. I've set the form's OnSubmit and the submit button's onClick, only because I'm not sure which will work best. I'd expect this to work with a normal form submit but maybe file upload is funny... George