I added Bootstrap3 plugin in my IntelliJ IDEA and also added the css and js links in the html page. But I couldnt get the autocompletion for bootstrap class names etc. How can I achieve that?
I had the same issue and ended up finding this: https://intellij-support.jetbrains.com/hc/en-us/community/posts/206324479-How-to-activate-autocomplete-with-Bootstrap
trick is that you can't use the cdn delivered css - you have to have it locally referenced.
This line worked for me (html file is in .../resources/templates/ and bootstrap .css file was downloaded to .../resources/static):
<link rel="stylesheet" href="../static/bootstrap.css">
I did have to wait a bit for intellij to index it first.
Hope that helps :)