If you set an invalid locale to datepicker, it switches to chinese language. I.e. $.datepicker.setDefaults($.datepicker.regionalxy?); Wouldn't it be better to take "en" as default, if an invalid locale is given? I currently have to do this manually.

A try to launch my simple code for use autocomplete in text field.

npm deps

    "jquery": "^3.1.1",

    "jquery-ui": "^1.12.1",

No good look..

Javascript error: autocomplete is not a function

But if npm deps

    "jquery": "^2.2.4",

    "jquery-ui": "1.10.5",

All its work

May be bug or i stupid?

In date picker if your textbox type is month and year only, You select a date like April 2018 and focus out of textbox again focus back in textbox and open datepicker and you will find that it started with first value in change year and month dropdowns

let me know if further inputs are required

   $(function () {
        $('.date-picker').datepicker({
            changeMonth: true,
            changeYear: true,
            showButtonPanel: true,
            dateFormat: 'MM yy',
            onClose: function (dateText, inst) {
                var month = $("#ui-datepicker-div .ui-datepicker-month :selected").val();
                var year = $("#ui-datepicker-div .ui-datepicker-year :selected").val();
                $(this).datepicker('setDate', new Date(year, month, 1));
            }
        });
    });