13 jQuery SelectBox/Drop-down Plugins — SitePoint
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javascript - Chosen JS - Add the optgroup to the selected item - Stack Overflow
javascript - Lou multi-select filter DUAL List by optgroup Label - Stack Overflow
jQuery Plugin For Filterable Bootstrap 5/4 Dropdown Select - Bootstrap Select | Free jQuery Plugins
20 jQuery Plugins Replacing the Select Box | Learning jQuery
Mixed options with optgroup and no optgroup · Issue #52 · marcj/jquery-selectBox · GitHub
Multi-level Menu of Filters · Issue #853 · mistic100/jQuery-QueryBuilder · GitHub
jQuery Mobile Form Select
Chosen - a JavaScript plugin for jQuery and Prototype - makes select boxes better | Pearltrees
javascript - Chosen JS - Add the optgroup to the selected item - Stack Overflow
javascript - jquery on search filter - if search does not match, option gets hidden but optgroup still displayed, how to hide optgroup - Stack Overflow
jQuery Plugin For Multi Select List with Checkboxes - MultiSelect | Free jQuery Plugins
Jquery bootstrap multiselect optgroup selection - Stack Overflow
Quick Tip: Don't Forget the “optgroup” Element | Envato Tuts+
filter: hide optgroup label if no children match · Issue #51 · ehynds/jquery-ui-multiselect-widget · GitHub
javascript - How can I make bootstrap multiselect optgroups collapse by default? - Stack Overflow
jQuery filter select options - Stack Overflow
Bootstrap Select & Multiselect: Plugins + Examples | AZMIND
Custom Single/Multi Select In Pure JavaScript - vanillaSelectBox | CSS Script
jQuery Dual List - Webby Mage
