Auto populate Assigned vendors based on assignment group in work order task FSM

[Community Alums]

Hi all,

I want to auto - populate the 'assigned vendor' field  based on selection of assignment group of work order task.

Assigned vendors( assigned_vendors) - reference qualifier: javascript:'sys_idIN' + current.assignment_group.vendors.

 using on change script but it's not working.

function onChange(control, oldValue, newValue, isLoading, isTemplate) {

    if (newValue !== '') {

        var ga = new GlideAjax('WMAssignmentAJAX');

        ga.addParam('sysparm_name', 'getVendorAssignee');

        ga.addParam('sysparm_groupId', g_form.getValue('assignment_group'));

        ga.getXMLAnswer(function(response) {

            var result = JSON.parse(response);

            //alert("defaultVendorAssignee");

            if (!isLoading && result.defaultVendorAssignee) {

                g_form.setValue('assigned_vendor', result.defaultVendorAssignee);

                g_form.setMandatory('assigned_vendor', true);

                g_form.addInfoMessage(getMessage('Assigned vendors updated'));

            }

            g_form.setDisplay('assigned_vendor', true);

            g_form.setDisplay('vendor_reference', true);

        });

    }

}

include:

var WMAssignmentAJAX = Class.create();
WMAssignmentAJAX.prototype = Object.extendsObject(AbstractAjaxProcessor, {
getVendorAssignee: function() {
var assignment_group = this.getParameter('sysparm_groupId') + '';
var result = {};
var wotvendor = new GlideRecord('core_company');
wotvendor.addQuery('sys_id', assignment_group.vendors);
wotvendor.query();
while (wotvendor.next()) {
gs.log("test" + assignment_group.vendors);

result.defaultVendorAssignee = wotvendor.name + '';

}

return new JSON().encode(result);

},

assignment_group.vendors - returns null

any help is really appreciated.