Please override the 'blur' handler for the numberbox.
$.extend($.fn.numberbox.defaults.inputEvents, {
blur: function(e){
var t = $(e.data.target);
if (t.hasClass('f1') && !$.trim(t.numberbox('getText'))){
t.numberbox('setValue',0);
} else {
t.numberbox('fix');
}
}
})
If the numberbox component has the 'f1' class, it will auto fill the '0.00' value by default.
<input class="easyui-numberbox f1" label="List Price:" labelPosition="top" precision="2" value="234.56" style="width:100%;">