In my ASP tutorial you will learn about ASP, and how to execute scripts on your server.

ASP Tutorial: ASP Forms and User Input

ASP Forms and User Input

The Request.QueryString and Request.Form
commands may be used to retrieve information from forms, like user input.



Examples


A
form with method="get"

How to interact with the user, with the Request.QueryString command.


A
form with method="post"

How to interact with the user, with the Request.Form command.


A
form with radio buttons

How to interact with the user, through radio buttons, with the Request.Form
command.



User Input


The Request object may be used to retrieve user information
from forms.


Form example:









<form method="get" action="simpleform.asp">
First Name: <input type="text" name="fname" />
<br />
Last Name: <input type="text" name="lname" />
<br /><br />
<input type="submit" value="Submit" />
</form>

User input can be retrieved in two ways: With
Request.QueryString or Request.Form.



Request.QueryString


The Request.QueryString command is used to collect values in a
form with method="get". Information sent from a form with the GET
method is visible to everyone (it will be displayed in the browser's address
bar) and has limits on the amount of information to send.


If a user typed "Bill" and "Gates" in the
form example above, the URL sent to the server would look like this:









http://www.w3schools.com/simpleform.asp?fname=Bill&lname=Gates

Assume that the ASP file "simpleform.asp" contains
the following script:









<body>
Welcome 
<%
response.write(request.querystring("fname"))
response.write(" " & request.querystring("lname"))
%>
</body>

The browser will display the following in the body of the
document:









Welcome Bill Gates





Request.Form


The Request.Form command is used to collect values in a form
with method="post". Information sent from a form with the POST method
is invisible to others and has no limits on the amount of information to send.


If a user typed "Bill" and "Gates" in the
form example above, the URL sent to the server would look like this:









http://www.w3schools.com/simpleform.asp

Assume that the ASP file "simpleform.asp" contains
the following script:









<body>
Welcome 
<%
response.write(request.form("fname"))
response.write(" " & request.form("lname"))
%>
</body>

The browser will display the following in the body of the
document:









Welcome Bill Gates





Form Validation


User input should be validated on the browser whenever
possible (by client scripts). Browser validation is faster and you reduce the
server load.


You should consider using server validation if the user input
will be inserted into a database. A good way to validate a form on the server is
to post the form to itself, instead of jumping to a different page. The user
will then get the error messages on the same page as the form. This makes it
easier to discover the error.

Posted by JONAS