ch04

2023-03-14 08:51:55 -05:00
parent c9bb4ba5c5
commit bea3068292
319 changed files with 1275 additions and 0 deletions
--- a/ZIPs/JavaScript/ch04/ex_4_27.html
+++ b/ZIPs/JavaScript/ch04/ex_4_27.html
@@ -0,0 +1,47 @@
+<!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>&nbsp;</h2>
+<h1>Enter your contact information</h1>
+<tr><td><p>&nbsp;</p>
+<p><input type="button" id="email" value="Begin now" onclick="getEmail();" /></p>
+</td></tr>
+<tr><td id ="message"><p>&nbsp;</p></td></tr>
+</table></body>
+</html>
+