Jquery: some time my drop down value is not getting changed?

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Jquery:I called onchange event of textbox on document.readyfunction. i have called method on onchange which fetching the value from database and assigning values to controls.some time my drop down value is not getting changed?randomly this issue occurred.

What I have tried:

<input type="text" id="txtmid" maxlength="15" onchange="GetISFDetails(this)" class="mws-textinput numbersOnly mandatory" style="font-family: PTSansRegular, Arial, Helvetica, sans-serif; font-size: 13.4915px;">

 var vars = [], hash;
            var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
            for (var i = 0; i < hashes.length; i++) {
                hash = hashes[i].split('=');
                vars.push(hash[0]);
                vars[hash[0]] = hash[1];
//                if (vars[hash[0]] == "" || vars[hash[0]] == "0") {
                    $('.tblmid').find('#txtmid').val(vars[hash[0]]);
                    $('.tblmid').find('#txtmid').change();
              //  }
            }

  function GetISFDetails(obj) {
            debugger
            var jqddlobject = $(obj);
<pre> var obj = $.parseJSON(data.d);
                    for (var a = 0; a < 2; a++) {

                        if (a == 0) {
                            for (var c = 0; c < obj[a].length; c++) {
jqddlobject.closest('table').find('.ddlMstatus').val(obj[a][c].STATUS);
                                jqddlobject.closest('table').find('.ddlMstatus').trigger("liszt:updated");
}}<pre>