jQuery UI widgets: when and how to use them

jQuery UI is a companion library that provides interactive widgets, effects, and themeable components. Its widget suite includes controls such as datepicker, dialog, tabs, autocomplete, and slider. It is most useful when a project already uses jQuery and a widget matches the interaction you need.

Check compatibility and maintenance first

The stable jQuery UI 1.14 line supports recent jQuery versions, including jQuery 4.0.0. The project describes jQuery UI as being in maintenance: compatibility updates and security fixes are expected, while substantial new feature work is not planned. That makes it a practical option for existing jQuery sites, but a reason to compare alternatives for a new application. Check the official download page and release notes before choosing a version.

Include only the library and theme you use

For a production site, prefer a pinned package or a pinned official CDN version. The example below uses jQuery 3.7.1 with jQuery UI 1.14.2, a tested combination. Include the theme stylesheet as well as the JavaScript.

<link rel="stylesheet"
  href="https://code.jquery.com/ui/1.14.2/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
<script src="https://code.jquery.com/ui/1.14.2/jquery-ui.min.js"></script>

Initialize a date picker

Keep a visible label and use a native date input when it meets the project’s browser and design requirements. If you choose the jQuery UI datepicker, label the text field and provide a format that is clear to the people who use the form.

<label for="appointment-date">Appointment date</label>
<input id="appointment-date" name="appointment-date" type="text"
  autocomplete="off">

<script>
$(function () {
  $("#appointment-date").datepicker({
    dateFormat: "yy-mm-dd",
    changeMonth: true,
    changeYear: true
  });
});
</script>

The date picker does not replace server-side validation. Validate dates on the server, explain errors in text, and verify keyboard operation and screen-reader behaviour in the version you deploy.

Trim the download and avoid conflicts

jQuery UI’s download builder lets you select components and themes. Include one jQuery copy and make sure every plugin initializes after its dependencies. When upgrading an older site, test each widget: styling, keyboard interaction, and event details may differ between versions. The official API documentation lists the options and events supported by each widget.