I am sure that this question must have been asked before, but I need to know

how to pass a JavaScript variable to ASP.



When people register on our site, we may or may not already have their email

address.  95% of the registration problems occur when people enter a wrong

email address (transpose letters, whatever).  



When they submit the HTML form, as ASP program does a number of things

before allowing them to register.  I am adding to that something to see if

the email address they have entered already matches what we have.  If this

is the case, then  fine.  If not, I want to pop up a JavaScript prompt

asking them to confirm the entry of their email address.  I can then compare

when they entered in the JavaScript prompt to what they entered through the

form, which should catch most of these.



So far, so good.



The only problem I have at this moment is understanding exactly how to pass

what they have entered through the prompt to the ASP portion of the program.

Any help here?



The code is simply this:



    ' If no match was found, ask for a confirmation

    If EmailExists = False Then

      Response.Write "<script language=JavaScript>"

      Response.Write " var ConfirmEmail = prompt('Please confirm your email

address by entering it here.');"

      Response.Write "</script>"

    End If



Thanks -



George L Smyth, Webmaster

US Naval Academy Alumni Association

Since you have to go to the database via the server to check if the email

address is already there, you only need to add the action to the asp page

that processes the original form.  If the address is not in the database,

you add their information and if it is in the database you respond with a

page that says 'You are already in our database. Would you like to edit your

profile?' or something like that.  Major problem with this is that email

addresses are not unique.  e.g. jsmith@y... may be dropped by one

person and be taken later by another.  So you don't want to assume it is the

same person or you will be giving someone's personal information to the

wrong person as well as creating all sorts of data reliability problems.

You should have some other unique identifier used in the process.



You should map out the whole process. Then program it.



- George



-----Original Message-----

From: George Smyth <george.smyth@U...>

To: ASP Web HowTo <asp_web_howto@p...>

Date: Tuesday, April 24, 2001 3:13 PM

Subject: [asp_web_howto] Passing Variable From JavaScript to ASP





>I am sure that this question must have been asked before, but I need to

know

>how to pass a JavaScript variable to ASP.

>

>When people register on our site, we may or may not already have their

email

>address.  95% of the registration problems occur when people enter a wrong

>email address (transpose letters, whatever).

>

>When they submit the HTML form, as ASP program does a number of things

>before allowing them to register.  I am adding to that something to see if

>the email address they have entered already matches what we have.  If this

>is the case, then  fine.  If not, I want to pop up a JavaScript prompt

>asking them to confirm the entry of their email address.  I can then

compare

>when they entered in the JavaScript prompt to what they entered through the

>form, which should catch most of these.

>

>So far, so good.

>

>The only problem I have at this moment is understanding exactly how to pass

>what they have entered through the prompt to the ASP portion of the

program.

>Any help here?

>

>The code is simply this:

>

>    ' If no match was found, ask for a confirmation

>    If EmailExists = False Then

>      Response.Write "<script language=JavaScript>"

>      Response.Write " var ConfirmEmail = prompt('Please confirm your email

>address by entering it here.');"

>      Response.Write "</script>"

>    End If

>

>Thanks -

>

>George L Smyth, Webmaster

>US Naval Academy Alumni Association

>

>

you have to submit it back to the server through get or post.  the asp will

continue to execute beyond the point where you write the code to create the

prompt, and will have finished executing by the time the user gets the

prompt.  All you can do is place whatever they put in the prompt into a

hidden input field and re-submit the page.



-----Original Message-----

From: George Smyth [mailto:george.smyth@U...]

Sent: Tuesday, April 24, 2001 7:55 PM

To: ASP Web HowTo

Subject: [asp_web_howto] Passing Variable From JavaScript to ASP





I am sure that this question must have been asked before, but I need to know

how to pass a JavaScript variable to ASP.



When people register on our site, we may or may not already have their email

address.  95% of the registration problems occur when people enter a wrong

email address (transpose letters, whatever).  



When they submit the HTML form, as ASP program does a number of things

before allowing them to register.  I am adding to that something to see if

the email address they have entered already matches what we have.  If this

is the case, then  fine.  If not, I want to pop up a JavaScript prompt

asking them to confirm the entry of their email address.  I can then compare

when they entered in the JavaScript prompt to what they entered through the

form, which should catch most of these.



So far, so good.



The only problem I have at this moment is understanding exactly how to pass

what they have entered through the prompt to the ASP portion of the program.

Any help here?



The code is simply this:



    ' If no match was found, ask for a confirmation

    If EmailExists = False Then

      Response.Write "<script language=JavaScript>"

      Response.Write " var ConfirmEmail = prompt('Please confirm your email

address by entering it here.');"

      Response.Write "</script>"

    End If



Thanks -



George L Smyth, Webmaster

US Naval Academy Alumni Association

________________________________________________________________________

Scottish Enterprise Network

http://www.scottish-enterprise.com