bootstrap-select
· Bootstrap-select is a jQuery plugin that utilizes Bootstrap's dropdown.js to style and bring additional functionality to standard select elements.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window bootstrap-select-1.12.2.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.