How I get value from PageTable when I clicked Button (BaseTheme.BUTTON_LINK

Hi, I would like to getTextfield value in PageTable (column Operation No) when I clicked Link Button “เพิ่มรายการวัสดุ” in current row

This is example picture.

http://image.free.in.th/show.php?id=7b6308ff5d8cfadbae415a42f68aec41

Help me please.
Sorry, I can not write English well. I am Thai people