Question

I’ve got a simple HTML page with a hidden field on it. I display a DIV which has a button on for the user to click – when they do that, I want to update the hidden field on the main page.

At the moment, I have this in my main HTML (in a CGI file):

print "<td><input type=\"hidden\" id=\"mailUpdate\"></td></tr>";

I have this (in a javascript module accessed by the onClick for a button in the div):

var updMail = document.getElementById("mailUpdate");
updMail.value = 1;

but when I try read this (in the same CGI file as above) with this:

formData = cgi.FieldStorage()
doUpd = formData.getvalue("mailUpdate")
if (doUpd == 1):
    print "Maint button - doing update"

‘doUpd’ is never getting any value.

Hope this makes sense – any ideas?

Answer 1

You issue lies in the expression (doUpd == 1): You are comparing doUpd, which is a string, to an integer, 1. This will always be False. Changing to (doUpd == '1'): should fix your issue.

Also, You need to add the name to the input so that it will come across with the form.

print "<input type=\"hidden\" id=\"mailUpdate\" name=\"mailUpdate\"></td></tr>"