48 lines
1.2 KiB
HTML
Executable File
48 lines
1.2 KiB
HTML
Executable File
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
|
<html>
|
|
<head>
|
|
<title>Example 4.27</title>
|
|
<script>
|
|
function getEmail()
|
|
{
|
|
var atSign = "@";
|
|
email = prompt("Enter your email address", " ");
|
|
numChars = email.length;
|
|
okSign = 1;
|
|
for( j = 1; j < numChars; j++) //start at 1 because need at least 1 char before @
|
|
{
|
|
if (email.charAt(j) == atSign)
|
|
{
|
|
okSign = 0;
|
|
}
|
|
}
|
|
if (okSign == 0)
|
|
{
|
|
if (email.charAt(numChars - 4) != ".")
|
|
{
|
|
document.getElementById("message").innerHTML ="<h3>You entered " + email + ". This is not a valid email address.</h3>";
|
|
}
|
|
else
|
|
{
|
|
document.getElementById("message").innerHTML = "<h3>You entered " + email + ". This is a valid email address.</h3>";
|
|
}
|
|
}
|
|
else
|
|
{
|
|
document.getElementById("message").innerHTML = "<h3>You entered " + email + ". This is not a valid email address.</h3>";
|
|
}
|
|
}
|
|
</script>
|
|
</<head>
|
|
<body>
|
|
<table align ="center" width ="70%"><tr><td colspan ="2">
|
|
<h1> </h2>
|
|
<h1>Enter your contact information</h1>
|
|
<tr><td><p> </p>
|
|
<p><input type="button" id="email" value="Begin now" onclick="getEmail();" /></p>
|
|
</td></tr>
|
|
<tr><td id ="message"><p> </p></td></tr>
|
|
</table></body>
|
|
</html>
|
|
|