Still problem...Anyone can help me plz. Thank you

Dear,

I have a question about datagrid selections.
I have datagrid 1 with more items (can select one more multiple).
IMG 1:


I split function when select one item and selections for calculator price.
IMG 2:

But i have trouble when i try to calculate with selections. I want calc every items and plus all items's result for total value.

When i choose more than one items. And click DEM button. It will show this panel. cause i want apply for all items (calc for all items)
IMG 3:


DateBox is Extend date. Calc:

(Extend date - Last period) + free days + Cont fee + discount (if have).

- Last period: get from database
- Free days: get from db
- Con fee: from db by selected cont.

With one item, i do it as IMG 1. But with selections, i want do it as above and after that get total. but i fail

Please help me
Im very thank you.

Yeah. I mean that. And it worked.
Thank mate.

Dear,

I have datagrid with checkbox. So i want to do as below
if i selected one row have one panel 1 show.
if i selected 2 rows or more, have panel 2 show and panel 1 hide.

I think about count many rows selected, but i just use easyui, so i need your help.

Plz help me,
thank you!