I was recently solving a requirement where a TextBox having text needed to be made read-only, as soon as focus was set on it. This is a typical scenario where a user reloads a form that is to be presented as read-only. This is how I solved the requirement using jQuery:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="Scripts/jquery-1.3.2.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
$("input[type=text]").focus(function() {
if ($(this).val())
$(this).blur().css('background-color', 'gray');
});
});
</script>
</head>
<body>
<form id="form1">
<div>
<input id="Text1" type="text" value="Some Text" />
<input id="Text2" type="text" value="Some Text" />
<br />
<input id="Button1" type="button" value="Some Button" />
</div>
</form>
</body>
</html>
So as soon as you set focus on the textbox, the textbox turns grey indicating that it is read-only and the user is prevented to modify the text.
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