jQuery Plugin For Seachable Option List with Checkboxes | Free jQuery Plugins
jQuery Plugin For Multi Select List with Checkboxes - MultiSelect | Free jQuery Plugins
Multi-select Dropdown List with Checkbox using jQuery - CodexWorld
jquery - Get selectize.js to show optgroup headers - Stack Overflow
Custom Single/Multi Select In Pure JavaScript - vanillaSelectBox | CSS Script
Quick Tip: Don't Forget the “optgroup” Element | Envato Tuts+
javascript - Chosen JS - Add the optgroup to the selected item - Stack Overflow
bootstrap selectpicker - Select/Deselect optgroup based on option select in select picker Boostrap - Stack Overflow
JQuery - Cross-browser hide option and optgroup in a SELECT
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 filter select options - Stack Overflow
Bootstrap Select & Multiselect: Plugins + Examples | AZMIND
14 Multiselect For Web Developer. Today we're going to learn how to… | by Niemvuilaptrinh | Medium
Incorrect result when optGroup with multiple · Issue #217 · lcdsantos/jQuery-Selectric · GitHub
jQuery Dual List - Webby Mage
Improved Dropdown (jQuery plug-in) | Improving Software
change select based on optgroup filter
optgroup> ability · Issue #48 · mistic100/jQuery-QueryBuilder · GitHub
Flexible Multiple Select Widget For jQuery UI - multiSelect.js | Free jQuery Plugins
Improved Dropdown (jQuery plug-in) | Improving Software
javascript - How can I make bootstrap multiselect optgroups collapse by default? - Stack Overflow
High Performance Select Box JavaScript Library - Virtual Select | CSS Script
13 jQuery SelectBox/Drop-down Plugins — SitePoint
