Restricting hotmail users from signing up - Coldfusion - Advanced Techniques

[davellaman]

I would like to know how I could accomplish putting a restriction on certain
email address's from signing up. Lets say when a user signs up with the email
address com a warning would come up saying something like "no free
email accounts". Also, is there a way to only allow certain things like,
".net" or ".edu". Lets say I have an educational portion of my site that only
people with a ".edu" email address can access....How do I go about validating
the form....I am not sure how to figure this out. I would assume the email
variable would be broken down to find the symbol and everything after would
be compared to what is allowed and not allowed. But how exactly?


I am only look for validation upon signup. So when they first sign up I want
to make sure they have a certain certain email address ".edu" if signing up for
education portion of the site and the other site I want to make sure it is not
a free account aka com


Thanks a bunch to anyone who knows how to do this.

[Stealth]

You can use the right() function in Coldfusion to return a certain number of
characters and test. The right() function passes a string and number of
characters on the right/end of the string to get. For example:

<cfif #right(email_variable, 11)# IS "hotmail.com">
<cfoutput>Sorry Charlie, no hotmail accounts allowed.</cfoutput>
</cfif>

<cfif #right(email_variable, 4)# IS ".edu">
<cfoutput>OK. You are a winner</cfoutput>
</cfif>

I would consider using the trim() function to eliminate any spaces after, too.
So it would be:
<cfif #trim(right(email_variable, 4))# IS ".edu">

[mxstu]

davellaman,

In addition to Stealth 7's suggestions you may also want to perform some email
address validation. There is a good example in this thread:


http://www.macromedia.com/cfusion/webforums/forum/messageview.cfm?catid=7&thread
id=935927

[Kronin555]

You actually want to do the trim before you do the right.

<cfif #right(trim(email_variable)4)# IS ".edu">

The best thing to do, if you're doing alot of processing on email_variable, is
just to trim it up front:
<cfset email_variable = trim(email_variable)>

then you no longer have to worry about leading or trailing spaces.

[Dan]

Something like this will work. You can condense it for efficiency, but I will
be methodical for clarity.

BadDomains="hotmail,yahoo,macromedia,etc";
P1=lower(ListLast(form.email, ""));
P2=ListFirst(P1, ".");

if listfind(BadDomains, p2)
code for bad domain
else
code for good domain

Do all that trim stuff the other guys mentioned as well. We use javascript to
do this as an onchange event handler.


Originally posted by: davellaman
I would like to know how I could accomplish putting a restriction on certain
email address's from signing up. Lets say when a user signs up with the email
address com a warning would come up saying something like "no free
email accounts". Also, is there a way to only allow certain things like,
".net" or ".edu". Lets say I have an educational portion of my site that only
people with a ".edu" email address can access....How do I go about validating
the form....I am not sure how to figure this out. I would assume the email
variable would be broken down to find the symbol and everything after would
be compared to what is allowed and not allowed. But how exactly?


I am only look for validation upon signup. So when they first sign up I want
to make sure they have a certain certain email address ".edu" if signing up for
education portion of the site and the other site I want to make sure it is not
a free account aka com


Thanks a bunch to anyone who knows how to do this.