Hello selvakumar,

Thank you for posting in our community.

I made a small sample illustrating your requirements and I am attaching it for your reference. 

I have igGrid with unbound template column. When the template column is clicked igDialog with another grid is loaded. Once the grid in the dialog is double clicked dialog is closed and particular value from the grid is set for an input field on the main page. Since igGrid currently does not support a row double click event out of the box as a work around I am using jQuery dblclick function and I am binding it directly to listen for double click events. In the event handler I am taking particular cell value. For example:

$("#grid1").dblclick(function (event) {
   // row html element
   var row = $(event.target).closest('tr');
   // data key value
   var key = row.attr("data-id");
   // cell values
   var cellStock = row.find('td:eq(3)').text();
   $("#input").val(cellStock);
   $("#dialog").igDialog("close");
  });

Please have a look at my sample and let me know if you need any further assistance with this matter.