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disactivate button submit if valueA<valueB

Posted on 2005-02-27
Medium Priority
Last Modified: 2010-04-25
hello experts

i'm doing a small JSP-MYSQL project.

i have a payment page that displays a 'balAcc' and a 'total' field.

the 'balAcc' is from table reg while 'total' is from table svc.

i need to disactivate the submit button if the value of 'balAcc' is less than value of 'total'.

if  the value of 'balAcc' is greater than 'total', the submit button is enabled and i need to display the total in a redirected page, together with date and time upon the user click on button submit.

the date and time is equals to the date and time the user clicked on the submit button.

please..please..please.. help. thanks in advance.
Question by:nurbahiyah
1 Comment
LVL 14

Accepted Solution

Esopo earned 600 total points
ID: 13416316

Try this:
<form name="form1" method="post" action="">
Total  <input type="text" name="T1" id="T1"><br>
Ammount  <input type="text" name="T2" id="T2" onKeyUp="CheckSubmit()"><br>
  <input type="submit" name="Submit" id="Submit" value="Submit" disabled>
<br>If total is = to ammount the submit button becomes enabled

<script language="JavaScript">
function CheckSubmit()
  if (document.getElementById('T1').value==document.getElementById('T2').value){

It uses getElementById to interact with the form controls. By using the DISABLED property of the submit button you can block the form from sending the info until the criteria is met.

This code will work in both IE and FireFox. Note that if your visitor don't support javascript, they won't be allowed to send the form.

>>i need to display the total in a redirected page, together with date and time<<
You should get the date/time info from the server. I suspect you are using PHP:

Best regards,


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