Need help for getting the value of the Text field/Floating field dynamically

as can see screenshot. current requirement display field 1.operation no. dynamically, field below internal table, , have mapped in next body page subform(actually should not displayed,so set hidden).

so have 2 ideas requirement, don't know 1 easier implement, , how write code inside form, because new adobe form, hope can me, thank much!

1. can instant value of operation no in body page,  tried many times, , failed this...

2. can count how many times operation no in body page has been output, , write java script display correspoding line in internal table, have tried also, not work fine, have defined global variable inside form, seems not work inside body page or subform head...below code have written.

 

data.#pageset[0].page1.subheaderinformation.headerinformation_tbl.opera.vtext::calculate - (formcalc, server)

this.rawvalue = $record.gt_vornr.data[x].vtext (this works fine)

 

data.#pageset[0].page2.subheaderinfo.subheaderinformation.headerinformation_tbl.opera.vte xt::calculate - (formcalc, server)

// rows

// rows = count( $record.gt_vornr.data[*].vornr )

//below need testing

  if ( x lt rows ) then

    x = x + 1

   else

   x = x - 1

  endif

this.rawvalue = $record.gt_vornr.data[x].vtext

this question seems how can value subform master page...

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