aspose file tools*
The moose likes JSP and the fly likes Validation in JSP. Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » JSP
Bookmark "Validation in JSP." Watch "Validation in JSP." New topic
Author

Validation in JSP.

Ram Kas
Ranch Hand

Joined: Jul 26, 2006
Posts: 83
I have a form with 3 fields in a form, UserName, City, Country. Length of each field should not exceed 10 characters. If it exceeds it, the page should be reloaded with error message on the same line of the text box.

Can anybody tell me how I can do it?
Chetan Parekh
Ranch Hand

Joined: Sep 16, 2004
Posts: 3636
<input type="text" maxlength="10" name="text1">

User maxlenght attribute, it will not allow user to enter 11th character at first place.


My blood is tested +ve for Java.
Bear Bibeault
Author and ninkuma
Marshal

Joined: Jan 10, 2002
Posts: 61658
    
  67

Unless a malicious user writes his own form to submit to your server.

Point is, client-side validation should never be trusted.

Yes, go ahead and add the maxlength attribute -- that's good for users since they cannot enter too many characters. But also check the length when the code is submitted.

In fact, validation should occur at every layer in the app in case someone is trying to spoof the upper layers. It also makes your code more robust and re-usable.


[Asking smart questions] [Bear's FrontMan] [About Bear] [Books by Bear]
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: Validation in JSP.