https://www.titanmachinery.com/Frontend-Assembly/Telerik.Sitefinit…?package=Titan&v=MTQ1Mzc4NTcxMg%3d%3d

1(function ($) {
2    $(function () {
3        function changeOrInput(e) {
4            if (e.target.value === '') {
5                var validationMessages = getValidationMessages(e.target);
6                e.target.setCustomValidity(validationMessages.required);
7            }
8            else {
9                e.target.setCustomValidity('');
10            }
11        }
12
13        function invalid(e) {
14            var validationMessages = getValidationMessages(e.target);
15
16            if (e.target.validity.valueMissing) {
17                e.target.setCustomValidity(validationMessages.required);
18            }
19        }
20
21        function getValidationMessages(input) {
22            var container = $(input).parents('[data-sf-role="dropdown-list-field-container"]');
23            var validationMessagesInput = $(container).find('[data-sf-role="violation-messages"]');
24            var validationMessages = JSON.parse(validationMessagesInput.val());
25
26            return validationMessages;
27        }
28
29        function init() {
30            var containers = $('[data-sf-role="dropdown-list-field-container"]');
31
32            if (!containers || containers.length < 1)
33                return;
34
35            for (var i = 0; i < containers.length; i++) {
36                var select = $(containers[i]).find('[data-sf-role="dropdown-list-field-select"]');
37
38                if (select) {
39                    select.on('change', changeOrInput);
40                    select.on('invalid', invalid);
41                }
42            }
43        }
44
45        init();
46    });
47}(jQuery));