The javascript below checks whether the user has entered numeric value or alphabets in the text box. Here we used the onkeyup event to raise the javascript event.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
<script>
function checkForInvalid(obj) {
if( /[^0-9\-]|-{2,}/gi.test(obj.value) ) {
alert("Invalid character in Invoice No.")
obj.focus();
obj.select();
return false;
}
return true;
}
</script>
</head>
<body>
<form name="myForm">
<input type="text" name="invoiceNo" onkeyup="checkForInvalid(this)">
</form>
</body>
</html>
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