jsp - Display Tag unique row ID issue -

i working on employee leave application managers gets see there sub-ordinate pending leave request, can choose either accept or reject request.

i trying achieve using display tag, managed details db , display on jsp.

<disp:table name="pendingleaverequest" >         <disp:column  />  /*sample display column*/         <disp:column  />         <disp:column title="approve">             <input type="button" class="btn" value="approve"                 onclick="approveleave(this,**like pass row id**)" />         </disp:column>         <disp:column title="reject">          <input type="button" class="btn" value="reject"                 onclick="rejectleave(this, **like pass row id**)" />         </disp:column> 

my problem getting exact row details. went thro' articles on display tag in stacckoverflow, couldn't find relevant article issue. display tag http://displaytag.sourceforge.net/1.2/displaytag/tlddoc/index.html, reference article not clear on using uid details row details.

my question is, 1) how row id , pass it? 2) using row id how row details? novice when comes using display tag. highly appreciated.

<display:table name="pendingleaverequest" id="row"> ... <display:column>    <input type="button" class="btn" value="approve"             onclick="approveleave(this,${row.id})" /> </display:column> 

where id property of object.