How to find all readonly fileds using jQuery?

I have several text boxes with attribute 'readonly'

@Html.TextBoxFor(model => model.ClientNumber, new {@readonly = "readonly", @class ="message-label"})

How can I find all of them using jQuery (to enable similar behavior on keydown event)?

well use attribute seletor..

 $('input[readonly="readonly"]').keydown(function(){
     .....
 });

or just

$('input[readonly]').keydown(function(){..});