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How do I run some code on the loading of a page (ASP)

Posted on 2004-09-20
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Last Modified: 2010-04-17
I am trying to use cookies and I am new to web page development.  My thought is that when the page loads I should check for my cookie and adjust the formatting of the page acordingly.  So if a user is loged in certain fields will be availible and some will not.  I have figured out the cookie thing mostly but I cant figure out how to get the code to run before a button on the page is clicked.  I need to run my statements before the user sees what is on the page - before a button is clicked.  Where? How? do I put in the code I need?

Here is a tidbit from the start of my page...


Thank you,

TH

CODE
======================================================================================================

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<script runat="server">
   
                                                                                       ' <------------------ need to run this code first  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                                                                                       ' <------------------ need to run this code first  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
        If Request.Cookies("Preferences").HasKeys Then         ' <------------------ need to run this code first  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                                                                                      ' <------------------ need to run this code first  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
            TextBox_Password.Visible() = False                       ' <------------------ need to run this code first  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
            TextBox_UserName.Visible() = False                      ' <------------------ need to run this code first  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                                                                                      ' <------------------ need to run this code first  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                                                                                      ' <------------------ need to run this code first  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
        End If                                                                      ' <------------------ need to run this code first  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                                                                                      ' <------------------ need to run this code first  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
    Sub Button_Submit_Book_Click(ByVal sender As Object, ByVal e As System.EventArgs)
       
        'gather user entry data
        Dim strUserName As String
        Dim strPassword As String
       
        If Request.Cookies("Preferences").HasKeys() Then
           
            strUserName = Request.Cookies("Preferences")("UserName")
            strPassword = Request.Cookies("Preferences")("Password")
        End If
       
       
       
        If Not Request.Cookies("Preferences").HasKeys Then
            strUserName = TextBox_UserName.Text
            strPassword = TextBox_Password.Text
        End If
       
        Dim strBook_Title As String = TextBox_Book_Title.Text
        Dim strBook_Auther As String = TextBox_Book_Author.Text
        Dim strBook_ISBN As String = TextBox_Book_ISBN.Text
       
       
        Dim Flag_account_password_exist As Boolean
       
       

Thank you,
0
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Question by:travishaberman
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7 Comments
 
LVL 36

Accepted Solution

by:
Zyloch earned 500 total points
ID: 12109089
Hi travishaberman,

Don't put your code in <script runat="server"> Put them between <% and %>. This way, all your server side code is executed before anything should be printed to the screen.

Regards,
Zyloch
0
 

Author Comment

by:travishaberman
ID: 12109117
That worked Great!!!   You are going to get the 250... But I am going to up this to 500 for you if you can do me one better and tell me the syntax to check and see if a cookie exists..   My problem is that my current code checks to see if the cookie has "Keys"

If Request.Cookies("Preferences").HasKeys() Then
...
...


What I want to do is check to see if the cookie is there at all..

any thoughts?
if no.. then I will just accept your last answer..

Thanks!

-TH
0
 
LVL 36

Expert Comment

by:Zyloch
ID: 12109130
Never doubt the power of Google.

You can check

Request.Cookies("Preferences")<>''

if I'm correct, but if you want to check if a Preferences cookie has a certain key, you'd do

Request.Cookies("Preferences")("keyName")<>''
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Author Comment

by:travishaberman
ID: 12109148
hmmm.. that didn't quite do it.. I tried, but it says.. but I get an "expresson expected"

any more thoughts?
0
 
LVL 36

Expert Comment

by:Zyloch
ID: 12109155
Ah, let's see...

(Playing around here since not TOO great at ASP)

If Request.Cookies("Preferences") Is Nothing Then
   Cookie Does not Exist
0
 

Author Comment

by:travishaberman
ID: 12109164
That did it!!!

Thank you much,

-TH
0
 
LVL 36

Expert Comment

by:Zyloch
ID: 12109168
No prob, glad to help :)
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