Read ABAP Web dynpro table context on action / button click

Step 1 - Create the basics
Make sure you have a working web dynpro application which conatians a table and a button

Step 2 - Add code to your button action method
From the actions tab you can double click on your ACTION to view its associated method and add your own ABAP code to it.

* create local data variable to access context information
  Data: context_node type ref to if_wd_context_node.
  Data: it_scarr type STANDARD TABLE OF if_view1=>element_CARRIERS,
        wa_scarr like line of it_scarr.
  DATA: index type i.
  context_node = wd_context->get_child_node( name = 'CARRIERS').
  refresh: it_scarr.
* Get data contained within ABAP web dynpro table
  context_node->get_static_attributes_table(
    importing
      table = it_scarr ).
* Get data contained in a Specific row of an ABAP web dynpro table
  index = 3.  "Get row 3
  context_node->GET_STATIC_ATTRIBUTES(
     exporting index = index
     importing STATIC_ATTRIBUTES = wa_scarr ).