jQuery 3.2.1, HTML, CSS, JavaScript
Creating a complex control from simple HTML elements.
When user selects an option in one select, that option is disabled in all other selects.
jQuery 1.9.1, HTML, CSS, JavaScript
jQuery 2.1.3, HTML, CSS, JavaScript
jQuery 3.1.1, HTML, CSS, JavaScript
No-Library (pure JS), HTML, CSS, JavaScript