How to get select2 dropdown selected value while get data from database

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Ajax

CodeIgniter

Dear Friends,

I need to get select2 dropdown selected value on button click event.

actually what am doing is when i entered mobile number in textbox and click search button all data will show in textbox and dropdown. textbox values came but this select2 dropdown is not selected.

I tried all the methods but not working. please suggest me..

What I have tried:

function edit(){      
        var mobile_no = document.getElementById('ddlMobileSrch').value;
<pre> $.ajax({
                      type : "POST",
                      url  : "<?php echo site_url('index.php/customer/edit_content')?>",
                      dataType : "JSON",
                      data : {mobile_no:mobile_no},
                      success: function(data){ 
                       $.each(data.custdetails, function(i, val) {   
$("#ddlBillArea").val(val.billing_area_code).trigger('change');
 $('[name="ddlBillArea"]').val(val.billing_area_code).trigger('change');

$("#ddlBillArea").select2("trigger", "select", {
data: { id: val.billing_area_code } 
});
 });