$.get('/getJobs', function (jobs) {
        seljobs = jobs;
        var i = 0;
        jobs.forEach(function (n) {
                           alert("job id----"+n.id)// 32,67,45
                           alert("job names----"+n.names)//test1,test2,test3

            html += '<option value="' + i + '">' + n.names + '</option>';
            i++;
        });
        $('#jobSel').html(html);
    });

<tr>
                        <td width="200px">Jobs</td>
                        <td>
                            <select id="jobSel" class="longcombo"></select>
                        </td>
                    </tr>

$("#jodSel").on('change',function(){
    var getValue=$(this).val();
    alert(getValue);
  });

Example 1:
    <select id="example1">
        <option value="1">one</option>
        <option value="2">two</option>
        <option value="3">three</option>
        <option value="4">four</option>
    </select>
Example 2 :
    <select id="example2">
        <option id="1">one</option>
        <option id="2">two</option>
        <option id="3">three</option>
        <option id="4">four</option>
    </select>

$("#example1").on('change', function () {
    alert($(this).val());
});

$("#example2").on('change', function () {
    alert($(this).find('option:selected').attr('id'));
});

$('#jobSel').change(function(){
    var optId = $(this).find('option:selected').attr('id')
})

html += '<option id = "' + n.id + "' value="' + i + '">' + n.names + '</option>';

$('option:selected').attr("id")

$('option:selected').val()

var e = document.getElementById("jobSel");
var job = e.options[e.selectedIndex].value;

'<option nameid= "' + n.id + "' value="' + i + '">' + n.names + '</option>'

$('option:selected').attr("nameid")

<select id="jobSel" class="longcombo" onchange="GetNameId">
    <option nameid="32" value="1">test1</option>
    <option nameid="67" value="1">test2</option>
    <option nameid="45" value="1">test3</option>
    </select>

function GetNameId(){
   alert($('#jobSel option:selected').attr("nameid"));
}