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