/*
JavaScript Unleashed, Third Edition
by Richard Wagner and R. Allen Wyke
ISBN: 067231763X
Publisher Sams CopyRight 2000
*/
<html>
<head>
<title>String Validation</title>
<script language="JavaScript">
<!--begin script
function isString(textObj) {
var newValue = textObj.value;
var newLength = newValue.length;
var extraChars=". -,";
var search;
for(var i = 0; i != newLength; i++) {
aChar = newValue.substring(i,i+1);
aChar = aChar.toUpperCase();
search = extraChars.indexOf(aChar);
if(search == -1 && (aChar < "A" || aChar > "Z") ) {
return false;
}
}
return true;
}
// end script-->
</script>
</head>
<body>
<h1>String Validation</h1>
<form name="form1">
<input type="text"
size=16
maxlength=16
name="data">
<input type="button"
name="CheckButton"
value="Validate"
onClick="document.form1.result.value = '' +
isString(document.form1.data)">
<br>
Result
<input type="text"
size=16
maxlength=16
name="result">
</form>
</body>
</html>
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