jQuery
<script src="jquery.min.js"></script>
<script>
$(function() {
$('.character').change(function(){
var text = $(this).val();
var change = text.replace(/[A-Za-z0-9]/g,function(s){
return String.fromCharCode(s.charCodeAt(0)-0xFEE0);
});
$(this).val(change);
});
});
</script>
HTML
<input type="text" value="" class="form-control character">
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