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#!/usr/local/bin/perl
# This script illustrates how to use JavaScript to validate fill-out
# forms.
use CGI qw(:standard);
# Here's the javascript code that we include in the document.
$JSCRIPT=<<EOF;
// validate that the user is the right age. Return
// false to prevent the form from being submitted.
function validateForm() {
var today = new Date();
var birthday = validateDate(document.form1.birthdate);
if (birthday == 0) {
document.form1.birthdate.focus()
document.form1.birthdate.select();
return false;
}
var milliseconds = today.getTime()-birthday;
var years = milliseconds/(1000 * 60 * 60 * 24 * 365.25);
if ((years > 20) || (years < 5)) {
alert("You must be between the ages of 5 and 20 to submit this form");
document.form1.birthdate.focus();
document.form1.birthdate.select();
return false;
}
// Since we've calculated the age in years already,
// we might as well send it up to our CGI script.
document.form1.age.value=Math.floor(years);
return true;
}
// make sure that the contents of the supplied
// field contain a valid date.
function validateDate(element) {
var date = Date.parse(element.value);
if (0 == date) {
alert("Please enter date in format MMM DD, YY");
element.focus();
element.select();
}
return date;
}
// Compliments, compliments
function doPraise(element) {
if (element.checked) {
self.status=element.value + " is an excellent choice!";
return true;
} else {
return false;
}
}
function checkColor(element) {
var color = element.options[element.selectedIndex].text;
if (color == "blonde") {
if (confirm("Is it true that blondes have more fun?"))
alert("Darn. That leaves me out.");
} else
alert(color + " is a fine choice!");
}
EOF
;
# here's where the execution begins
print header;
print start_html(-title=>'Personal Profile',-script=>$JSCRIPT);
print h1("Big Brother Wants to Know All About You"),
strong("Note: "),"This page uses JavaScript and requires ",
"Netscape 2.0 or higher to do anything special.";
&print_prompt();
print hr;
&print_response() if param;
print end_html;
sub print_prompt {
print start_form(-name=>'form1',
-onSubmit=>"return validateForm()"),"\n";
print "Birthdate (e.g. Jan 3, 1972): ",
textfield(-name=>'birthdate',
-onBlur=>"validateDate(this)"),"<p>\n";
print "Sex: ",radio_group(-name=>'gender',
-value=>[qw/male female/],
-onClick=>"doPraise(this)"),"<p>\n";
print "Hair color: ",popup_menu(-name=>'color',
-value=>[qw/brunette blonde red gray/],
-default=>'red',
-onChange=>"checkColor(this)"),"<p>\n";
print hidden(-name=>'age',-value=>0);
print submit();
print end_form;
}
sub print_response {
import_names('Q');
print h2("Your profile"),
"You claim to be a ",b($Q::age)," year old ",b($Q::color,$Q::gender),".",
"You should be ashamed of yourself for lying so ",
"blatantly to big brother!",
hr;
}
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