fstdropdown - simple quick javascript dropdown plugin with bootstrap design and search, that able to work with thousands of options. Now with multiselect too. It has no dependencies, pure js and css.
fstdropdown initializes on page load, just add class "fstdropdown-select" to your select. If you add your select dynamically, add "fstdropdown-select" class to it and call function setFstDropdown(). If you change your select options list, use document.querySelector("your select").fstdropdown.rebind() to update dropdown list. You can use multiselect, by adding attribute multiple="multiple" to select. If you dont need search in dropdown, just add data-searchdisable="true" to the select. To add placeholder to search input, add data-placeholder to select. To use opened select or multiselect, add data-opened="true" to select.
To select value, you can use document.querySelector("your select").fstdropdown.setValue("your value"). If you want to select multiple values, you can send array of values document.querySelector("your select").fstdropdown.setValue(["value1", "value2", "value3"]).
Demo - https://htmlpreview.github.io/?https://github.com/VirtusX/fstdropdown/blob/master/index.html