Below highlighted in red is what the HTML for a hidden form value looks like. As you can see
it's almost the same as the HTML form textbox below it. The major difference is that the hidden form value isn't visible to the user.
<input type="hidden" name="hasdonelogin" value="true">
<input type="text" name="textfield" value="">
Using a hidden form value comes in handy for such things as logins,
where you have a username and password textbox. If the forms action
is to send its values to the same page (ie self referencing) then
by using a hidden form value you can monitor whether the user
has clicked on the submit button and thus filled in the form.
If it is the first time a user has accessed your page, hasdonelogin
will have no value, it will be empty. If they have just submitted
your form, hasdonelogin will have a value of true, and in that
scenario you don't need to show the login form again with the
username and password textfields.
<%
'If the hasdonelogin form value equals nothing
the form has not been submitted
If Request.Form("hasdonelogin")=""
Then
'make sure the username and password textboxes are displayed
%>
<form name="form1" method="post" action="">
<input type="hidden" name="hasdonelogin" value="true">
<input type="text" name="username" value=""><br>
<input type="text" name="password" value=""><br>
<input name="submit" type="submit" value="submit">
</form>
<%
Else'run this code if hasdonelogin has a value
of true
'don't show the username and password textboxes
response.write "You clicked on the form and the hidden value has been sent"
End If
%>
Have a look at the tutorial ASP
Password Protect for a more detailed explanation and example.
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