Send data to SAP using Hana WEB IDE

Hi,

I create fiori app in hana web ide and consume web service.

I can read data collection (BSEG table) from SAP but i would like to filter it

in SAP (send some filter parameters into SAP and use WHERE statement in select).

I can get this paramters in sap throw f.e.

DATA: lt_keys       TYPE /iwbep/t_mgw_tech_pairs,

            ls_key        TYPE /iwbep/s_mgw_tech_pair.

      lt_keys = io_tech_request_context->get_source_keys( ).

      READ TABLE lt_keys WITH KEY name = 'BELNR' INTO ls_key.

      belnr = ls_key-value.

How I put some parameters ( io_tech_request_context ) in javascript ?

sorry for my english.