The latest version of intellij idea2017 still does not seem to support the automatic completion of attributes in template files. There is a discussion on supporting thymeleaf completion in the official website forum, but it seems that there is no good solution yet. .
Unfortunately this bug is the result of multiple interdependent problems (Spring Boot autoconfig model, upgrade/extension of existing Spring MVC ), each of which needs to be adressed in order to make this fully working. We're working towards a solution for 2016.x and will make results available in Early Access Program ASAP. Thanks for your understanding.
https://www.jetbrains.com/hel...
Do you have an activation code?