I am trying to place a bootstrap drop-down menu on OPAC header section. Please find the code that has been tried.
Aside from one minor markup error I find that your example works fine for me. I'm not sure what you want it to look like, but I think you're missing a closing </li> after the first <li class="dropdown">. That might not be right, though, since that would make your "About" menu empty. Double-check your markup, because I think that is the root of your problem.
I had referred to following URL for the code, but not succeeded. https://v4-alpha.getbootstrap.com/components/dropdowns/
You're referring to documentation for the Bootstrap version 4 Alpha release. The OPAC still uses Bootstrap 2.x, so you should look here: https://getbootstrap.com/2.3.2/components.html#dropdowns -- Owen -- Web Developer Athens County Public Libraries http://www.myacpl.org