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01-26-2006, 01:21 PM
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How do I make fields mandatory on a form?
Hi I have a contact us form that emails me when submitted. However I want to make one of the fields mandatory so that if it isn't filled in it won't let you submit the form. However I not sure how to do it. Could anyone point me in the right direction?
Molly
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 Sorry spelling not my strong point!
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01-26-2006, 02:17 PM
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01-26-2006, 02:39 PM
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SEO Junior
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Join Date: Sep 2005
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Cheers I'm going to try the second one.
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Sorry spelling not my strong point!
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03-25-2006, 04:57 PM
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Don't forget that JavaScript validation is non-existent if someone wants to copy your page and fiddle the Javascript before they submit the form. Server-side validation is the only reliable validation. Maybe this isn't a serious issue in your case. Something to consider where authentication and money is involved.
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06-19-2006, 04:44 AM
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It depends on whether you are making the form in asp.net or php
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06-19-2006, 08:18 AM
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Quote:
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Originally Posted by mikhail
Don't forget that JavaScript validation is non-existent if someone wants to copy your page and fiddle the Javascript before they submit the form. Server-side validation is the only reliable validation. Maybe this isn't a serious issue in your case. Something to consider where authentication and money is involved.
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Uh...no. They can not modify the script becuase it is on your server. Downloading and changing it will have no affect because the form pulls it from the server. |
06-27-2006, 12:58 PM
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Quote:
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Originally Posted by jlknauff
Uh...no. They can not modify the script becuase it is on your server. Downloading and changing it will have no affect because the form pulls it from the server.
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I think what mkhail meant was that you can copy and paste the code, make changes, and upload to your server. Then set the action on the form to a full path, for example: http://www.someoneelsessite.com/process.php
Most forms don't verify that the HTTP_REFERRER was in fact not an external site. All someone would be doing is posting the form variables to your script, and bypassing any sort of javascript validation.
A little unlikely, yes, but it is possible. |
06-27-2006, 01:20 PM
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Quote:
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Originally Posted by ixpleo
<snip> Most forms don't verify that the HTTP_REFERRER was in fact not an external site. All someone would be doing is posting the form variables to your script, and bypassing any sort of javascript validation.
A little unlikely, yes, but it is possible.
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Good point, but actually, it's not so unlikely. A lot of spammers who can't get hosting are using this backdoor method to send unsolicited emails.
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08-26-2006, 04:04 PM
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Javascript is how you can validate the the fields were filled out on the client side. If you use PHP, PERL, ASP, or another cgi language, you could validate on the server side, but if you find a problem, your server side script will have to generate a page that shows a message to the user.
Javascript is the most popular option.
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08-26-2006, 04:41 PM
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SEO GUY Moderator
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Quote:
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Originally Posted by Molly
..I want to make one of the fields mandatory so that if it isn't filled in it won't let you submit the form..
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