David Gwyer

So, just how easy is it?
<ol>
<li>Install and activate the Plugin.</li>
<li>Add your jQuery code to the ‘Custom jQuery Code’ text box in Plugin settings.</li>
<li>Add the corresponding HTML markup to a post, page, or or text widget,</li>
<li>That’s it!!</li>
</ol>
You can easily tweak further settings such as the jQuery UI theme used to render the jQuery widgets, choose which scripts are added to your site, and overriding default CSS.
All standard pre-defined jQuery themes are supported, or you can upload your own custom theme built with the <a href="http://jqueryui.com/themeroller/" rel="nofollow ugc">jQuery ThemeRoller</a>. See the FAQ page for detailed instructions on uploading your own custom theme.
No need to mess about with cryptic shortcodes! Just enter clean, valid, HTML markup and the Plugin does the rest, adding all the necessary jQuery scripts and styles for you!
Note: This Plugin uses the Google CDN to load the CSS for the official jQuery UI themes.
Please <a href="https://wordpress.org/support/view/plugin-reviews/jquery-ui-widgets" rel="ugc">rate</a> this Plugin if you find it useful. It only takes a moment but it’s very much appreciated. 🙂
<blockquote>
We’re proud to announce that <a href="https://wpgoplugins.com/plugins/jquery-ui-widgets-pro/" rel="nofollow ugc">jQuery UI Widgets Pro</a> is now available!
Upgrade today for great features such as syntax highlighted code editors and dozens of pre-made jQuery UI templates ready to use!
Also, you can now add jQuery UI (and custom JavaScript and CSS code) to specific pages for the first time via the page/post editor. Take complete control over which pages have jQuery UI scripts added. You can choose to add to ALL pages or ONLY to the ones you want. It’s so simple!
Checkout the <a href="https://wordpress.org/plugins/jquery-ui-widgets/screenshots/" rel="ugc">screenshots</a>, or click <a href="https://wpgoplugins.com/plugins/jquery-ui-widgets-pro/" rel="nofollow ugc">here</a> for more details.
See our <a href="https://www.wpgoplugins.com" rel="nofollow ugc">WordPress plugin site</a> for more top plugins!
</blockquote>

jQuery UI Widgets

Awesome Idea!

Simple, flexible, and powerful way to add jQuery UI widgets to your site posts, pages, or widgets. Works right out of the box!

Yannick Lefebvre

The purpose of this plugin is to allow users to create one or more modal dialog(s) / pop-up window(s) that will appear when a user visits their site. The number of times that these can load is configurable. They can load content from external sites or custom HTML code into the dialog. This plugin can be used to invite people to register to a newsletter, respond to a survey, or simply welcome come to a site upon their first visit.
You can try it out in a temporary copy of WordPress <a href="https://demo.tastewp.com/modal-dialog" rel="nofollow ugc">here</a>.

Modal Dialog

The others either didn't work or caused massive JavaScript problems, breaking other plugins.

This plugin worked the best.

Worked better than the others

The purpose of this plugin is to allow users to create one or more modal dialog(s) / pop-up window(s) that will appear when a user visits their site.

jQuery UI Widgets vs Modal Dialog