How to get the thread ID when viewing a thread?

You should be able to get the root message id with one REST call using that env.context.message.uniqueId variable.  It will look something like this:

/restapi/vc/messages/id/${env.context.message.uniqueId }/root

This will return the topic message of the entire thread.  From that you can get the id.

You can also look at using the ${page.context.thread} variable.  That should get you the entire thread (along with it's id) without doing a rest call.  Just be careful where that call is made, it is only available on pages with threads like the ForumTopicPage.  You probably want to test for null before trying to use it.

Thanks, Kaela!  When I tried ${page.context.thread} I was getting back some Java .toString() type notation.  I had to search around a bit to find the env stuff.  Thanks for the REST URL.  I was hoping for a Freemarker variable, but REST will certainly work.

FYI, here is what I see when I use ${page.context.thread}:

lithium.eval.velocity.ThreadTemplateModel@e25235

I imagine this is an Object.  How can I access members of this object?

Yeah, it's returning you a thread object.  I will go check if the knowledge base has doc for the thread object, but in the meantime here it is:

thread

NOTE: YOU CAN NOT CALL THIS DIRECTLY – calls like page.context.thread will return you a thread

${page.context.thread.board}

${page.context.thread.topicMessage}

${page.context.thread.discussionStyle}

${page.context.thread.webUi.url}

If all you want is the thread id, I think this would work

${page.context.thread.topicMessage.id}

Thanks again, Kaela.  That sounded promising, but I'm getting weird results.  My topic URL looks like:

/My-Board/Default-email-notification-to-original-person-starting-a/td-p/66

When I do an alert("${page.context.thread.topicMessage.id}"), I get a pop-up that says "3" (I expected 66).  If I do a get on thread ID 3, I get something completely unrelated to this topic.  Am I interpreting the value of this property incorrectly or is there a different property to grab?

You rule.  Perfect!