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<TITLE>Age & Email Validator (Suzanne Stagel's JavaScript Assignment #4 Part I)
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<SCRIPT language="JavaScript">
<!-- //Begin hiding JavaScript code from non-enabled browsers
//This script does not use any form validation library. All validation of form entries is
//done in this script. See other version for example of use of library functions.
var ageValid = false; //indicates if age entry is valid
var emailValid = false; //indicates if email entry is valid
// validateAge
// Parameters: age, minimumAge
// Functionality: verifies that the age is greater than or equal to the minimumAge
function validateAge(age,minimumAge) {
if (age < minimumAge) {
alert("You indicated you are " + age + " years old. "
+ "You must be " + minimumAge
+ " to use this site. Please visit us after you turn "
+ minimumAge + ".");
ageValid = false;
} else {
ageValid = true;
}
}
// validateEmail
// Parameters: emailString
// Functionality: verifies that the emailString is properly formed
// (with "@" and "." in correct relative positions)
function validateEmail(emailString) {
var atCharacter = "@";
var dotCharacter = ".";
var emailLength = emailString.length;
var atPosition = -1;
var dotPosition = -1;
//Check that email address contains "@" symbol and not as first character
atPosition = emailString.search(atCharacter);
if (atPosition == -1 || atPosition == 0) {
alert("The email address you entered is invalid. Please reenter.");
emailValid = false;
} else {//search for "." symbol
dotPosition = -1;
//Find dotCharacter in emailString (-1 if not contained in string)
while (dotPosition < emailLength) {
if (emailString.charAt(dotPosition) == dotCharacter) {
break;
} else if (dotPosition == (emailLength-1)) {
dotPosition = -1;
break;
} else
dotPosition++;
} //end while
//Check that email address contains "." (dotCharacter) and is not the character
//immediately following the "@" (atCharacter) and is not last character in entry
if ( (dotPosition <= 0) || (dotPosition <= (atPosition+1)) || (dotPosition == (emailLength-1)) ) {
alert("The email address you entered is invalid. Please reenter.");
emailValid = false;
} else {
emailValid = true;
}
}
}
//-->
</SCRIPT>
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})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-47423994-1', 'fortunecity.ws');
ga('send', 'pageview');
</script>
<center>
<br>
<div>
<script language="javascript" type="text/javascript" src="http://ad.broadcaststation.net/ads/show_ad.php?width=728&height=90"></script>
</div>
</center>
<center>
<br>
<div style="height:5px"></div>
</center>
<FORM name="demographicsForm">
<TABLE cols="100,100" bgcolor="lightyellow" align=center border=1 cellpadding=10>
<TR bgcolor="#23238E">
<TD COLSPAN=2 align=center><B><FONT color="white">Please enter your details</FONT></B>
</TD>
</TR>
<TR>
<TD width=100><INPUT type="text" value="Name" name="name"></TD>
</TR>
<TR>
<TD><INPUT type="text" value="E-mail Address" name="email" onChange="validateEmail(this.value)"></TD>
</TR>
<TR>
<TD><INPUT type="text" value="Your Age" name="age" onChange="validateAge(this.value,18)"></TD>
</TR>
</TABLE>
</FORM>
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<script language="javascript" type="text/javascript" src="http://ad.broadcaststation.net/ads/show_ad.php?width=300&height=250&cache=0"></script>
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