The header is good, but I have these errors in the console now. while selecting the input
jquery.js?1594672809:6702 Uncaught TypeError: Cannot read property 'defaultView' of null
at getStyles (jquery.js?1594672809:6702)
at curCSS (jquery.js?1594672809:6715)
at Function.css (jquery.js?1594672809:7172)
at jquery.js?1594672809:7349
at access (jquery.js?1594672809:4428)
at jQuery.fn.init.css (jquery.js?1594672809:7331)
at datepicker_getZindex (jquery-ui.js?1594672814:3783)
at HTMLInputElement._showDatepicker (jquery-ui.js?1594672814:4526)
at HTMLInputElement.dispatch (jquery.js?1594672809:5226)
at HTMLInputElement.elemData.handle (jquery.js?1594672809:4878)
HTML
<input type="text" id="input-datepicker" value="2020-07-17" class="hasDatepicker" size="10">
JS
$(document).ready(function () {
egw.calendar(jQuery('#input-datepicker'), false, function(v){});
});