Question

FORM Validation Using Hidden Form Variables to an Action Page

Asked by: jturkington

Hello over the last year i have been using self posting pages to perform my FORM validation which works great..... BUT the only problem I am concerned with now is security of passing URL variables to other pages instead of hidden FORM fields.

For Example (Self Posting Framework At Present)

<cfset errorflag = false>

<cfif IsDefined("FORM.submitbutton")>

<!--- Validate Data and set error messages if any to VARIABLES.Msg --->

<!--- If there are no errors perform what ya got to do --->
<cfif NOT errorFlag>

   <!--- Perform Actions and move to next page --->
   <!--- Successful Go To Next Page --->
      <cflocation url="nextpagewithURLVarsAttached.cfm?id=1" addtoken="no">

<cfelse>
   <!-- validation failed, make the message pretty for the user -->
   <cfset VARIABLES.Msg="The following error(s) were detected:<ul>#VARIABLES.Msg#</ul>">

</cfif>
</cfif>

Is there anyway to pass the the URL's as hidden form fields as a few users have caught on its just a matter to switch the numbers in the URL to get what they want !!

Benefits of self posting forms:  -
Can populate Form Fields Values After Errors Occur easily
Personalised Error Messages For Each Validation Rule can be setup easily

Downsides
CFLOCATION can only pass values to next page as URLS ?!?

Any advice on how to improve my server side validation framework would be much appreciated..

Cheers

JT

 



                              

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Asked On
2005-12-06 at 02:41:25ID21654541
Tags

form

,

hidden

,

variables

,

validation

Topic

ColdFusion Application Server

Participating Experts
2
Points
500
Comments
16

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Answers

 

by: jimmy282Posted on 2005-12-06 at 06:24:07ID: 15427580

use the form method=post instead of get.

That wont have anything in the url then,.

 

by: jturkingtonPosted on 2005-12-06 at 06:26:45ID: 15427603

?? not sure what you mean ........

i always use POST never GET ??

Does GET not convert everything to URL's which is the opposite to what i want !

JT

 

by: jimmy282Posted on 2005-12-06 at 06:30:01ID: 15427634

not sure what you want

I think what you want is to avoid users from playing with the values in the URL, right ?

So what you can do is use POST for your forms. This way the values will never go in the URL querystring.

And if you want to pass on to the next page and take the values along/.....put all the values in hidden fields in a form and use javascript to submit the form

<form name=something>
<hidden fields....
</form>
<script>
document.something.submit();
</script>

makes sense?

 

by: jturkingtonPosted on 2005-12-06 at 06:35:27ID: 15427690

Yes but as mentioned above i have a self posting framework

<form name="dsp_form"method="post" action="dsp_form.cfm<cfif cgi.query_string NEQ "">?#cgi.query_string#</cfif>">
</form>

Because of the form validation benefits as mentioned in my opening question

Cheers

JT

 

by: pinaldavePosted on 2005-12-06 at 08:52:32ID: 15429024

Hi jturkington,
 
you can still have self posting form using form variables instead of the hidden variables.

Regards,
---Pinal

 

by: pinaldavePosted on 2005-12-06 at 08:53:11ID: 15429028

Also if you are worried about security, I would use encrypt() and decrept() function to encrypt it.

 

by: jturkingtonPosted on 2005-12-06 at 08:58:48ID: 15429106

Never thought of encrypt() pinaldave but sounds like to much work.....

Is there anyway to pass the FORM/HIDDEN variables to the next page of a self posting form without using Javascript/URLs as this sometimes in my situation could be turned off.

I am thinking about using the FUSEBOX 4.1 frameworks as it converts everything to ATTRIBUTES through the index.cfm page..

Help !

JT


 

 

by: pinaldavePosted on 2005-12-06 at 09:04:01ID: 15429158

Hi jturkington,

I think, if you do not want to use post method, javascript and URL param, I would use encrypt and decrypt.

<!--- This example shows the use of Encrypt and Decrypt --->
<h3>Decrypt Example</h3>
<p>This function encrypts/decrypts a string. Enter a string and a key.
<cfif IsDefined("FORM.myString")>
   <cfset string = FORM.myString>
   <cfset key = FORM.myKey>
   <cfset encrypted = encrypt(string, key)>
   <cfset decrypted = decrypt(encrypted, key)>
   <cfoutput>
      <h4><B>The string:</B></h4> #string# <br>
      <h4><B>The key:</B></h4> #key#<br>
      <h4><B>Encrypted:</B></h4> #encrypted#<br>
      <h4><B>Decrypted:</B></h4> #decrypted#<br>
   </cfoutput>
</cfif>
<form action = "encrypt.cfm">
<p>Input your key:
<p><input type = "Text" name = "myKey" value = "foobar">
<p>Enter string to encrypt:
<p><textArea name = "myString" cols = "40" rows = "5" WRAP = "VIRTUAL">
This string will be encrypted (try typing some more)</textArea>
<input type = "Submit" value = "Encrypt my String">
</form>

Example from : http://livedocs.macromedia.com/coldfusion/6.1/htmldocs/functi70.htm#wp1103962

Regards,
---Pinal

 

by: jturkingtonPosted on 2005-12-06 at 09:05:51ID: 15429181

Sorry pinaldave i might have got myself confused here

how do you use the "post method" with a self posting form ??

Cheers

JT

 

by: jturkingtonPosted on 2005-12-06 at 09:10:10ID: 15429232

Just to recap my situation

Keep posting form to itself until validation/actions are successful THEN REDIRECT to another .cfm page with all the FORM variables being passed with it instead of sticking them in a URL link..

Cheers

JT

 

by: pinaldavePosted on 2005-12-06 at 09:17:44ID: 15429305

Try this please:

<form method="Post" action="#CGI.cgi.query_string#">

<input type="text" name="myname" value="">

</form>

 

by: jturkingtonPosted on 2005-12-06 at 09:22:34ID: 15429344

Sorry still not explaining the problem clearly enough...

My self posting form works fine its when i REDIRECT out of this form to another form i cant get the FORM variables to follow.... for example CFLOCATION only accepts URL variables

what about CFHTTP ?

JT

 

by: pinaldavePosted on 2005-12-06 at 09:23:56ID: 15429357

Hi jturkington,
 
cfhttp for something outside of your domain it is not advised to use in the case of internal file location (cflocation is good for that) and i think you should use encrypt then.

Regards,
---Pinal

 

by: jturkingtonPosted on 2005-12-06 at 09:27:39ID: 15429409

So the answer is basically if you have a self posting form and you want FORM variables to be redirected to a different .cfm page it cannot be done ?!?!

JT

 

by: pinaldavePosted on 2005-12-06 at 09:28:45ID: 15429425

Hi jturkington,

I guess no. You can store them in session variables, if you are using session and than after you can use it otherwise no.
Because they are form variables.

Regards,
---Pinal

 

by: jturkingtonPosted on 2005-12-06 at 09:35:17ID: 15429496

If i move anyway from the self posting framework is there a good framework to :  -

Pre Populate The FORM again if any errors occur
Pass only FORM variables between .cfm pages
Eliminates the use of URL variables

Cheers

JT

20120131-EE-VQP-002

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