Need library file to perform this action.Please copy and Paste below library file.
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
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<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
jQuery Function
<script type="text/javascript">
$(function () {
$('#txtvalue').keydown(function (e) {
if (e.shiftKey || e.ctrlKey || e.altKey) {
e.preventDefault();
} else {
var key = e.keyCode;
if (!((key == 8) || (key == 32) || (key == 46) || (key >= 35 && key <= 40) || (key >= 65 && key <= 90))) {
e.preventDefault();
}
}
});
});
</script>
$(function () {
$('#txtvalue').keydown(function (e) {
if (e.shiftKey || e.ctrlKey || e.altKey) {
e.preventDefault();
} else {
var key = e.keyCode;
if (!((key == 8) || (key == 32) || (key == 46) || (key >= 35 && key <= 40) || (key >= 65 && key <= 90))) {
e.preventDefault();
}
}
});
});
</script>
HTML
Enter Your Text:<input type="text" id="txtvalue" />
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