Bootstrap Select
You can add a search input by passing data-live-search="true" attribute:
Add key words to options to improve their searchability using data-tokens.
Limit the number of options that can be selected via the data-max-options attribute
Using the title attribute will set the default placeholder text when nothing is selected
Specify how the selection is displayed with the data-selected-text-format attribute on a multiple select.
You can set the button classes via the data-style attribute
Use the data-width attribute to set the width of the select
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Add an icon to an option or optgroup with the data-icon attribute
Insert custom HTML into the option with the data-content attribute
Specify a number for data-size to choose the maximum number of items to show in the menu.
Adds two buttons to the top of the menu - Select All & Deselect All with data-actions-box="true".