Free Scripts |
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Form Input Validation JavaScript: Step 1b
by Christopher Heng
You will need to replace the "email" in both the
"name" attribute of the INPUT tag as well as the function checkform
to the actual name of the field you want to check. For example, if
you want to check a field called "fullname", replace all instances
of "email" in the function with "fullname".
The
function begins by checking that the field named "email" is not an
empty string. If it is, it will call the alert() function to display
a dialog box with the message "Please enter your email address." It
then calls form.email.focus() to place the text cursor in the email
field for the convenience of the visitor and returns "false" to
prevent the form from being submitted. On the other hand, if the
field was not empty, nothing is executed and the form is submitted
as usual.
What if you want to check more than one
field? Simply copy everything from the
//
** START **
line to the
// ** END
**
line and place it immediately below the
existing
// ** END **
line, before the
final closing brace "}". Then change all occurences of "email" in
the new block to the name of the field you wish to check. You can
duplicate that procedure as many times as you have fields to check.
Back to Step 1 >>
Copyright 2000 by Christopher Heng. All rights
reserved.
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