Demo Link: https://qasimali09.github.io/Custom-Select-Dropdown-in-javascript/ Github Link: https://github.com/qasimali09/Custom-Select-Dropdown-in-javascript Generate Custom select script: After adding generate custom select code to your project target select elements with generateSelect function if you want to target all select components just add generateSelect(“select”) to your javascript code. Generate custom select on page load function: