<style type="text/css"> .textbox .textbox-text{ text-transform: uppercase; }</style>
<input class="easyui-textbox" id="notes" name="notes" label="Notes:" labelAlign="right" data-options="prompt:'input your notes'" style="width:340px"><script>$(function(){ $('#notes').textbox('textbox').css('text-transform','uppercase');});</script>