A question about Custom Rolltemplates

Is it possible to implement something like custom roll templates for custom API commands? I have a macro that calls a custom API command, would it be possible to pass the results of the custom script into a html-customizable message template? Right now, I just have the script display the results as a chat message.

You can use the API to encapsulate your chat message in HTML/CSS styling for the chat window. Through this you can make it look  like a roll template, but it would not have the same functionality that a roll template would. You can also send the message as a roll template if it is available from the character sheet for the game.

For an example on using HTML/CSS with API output to chat, I highly recommend  Kristy's Faerun Calendar script as she does an excellent job of formatting her menu this way.

I would have to style messages using inline css, correct? Or is there a more convenient way (such as importing a css sheet from elsewhere)?

Inline unfortunately, which is why I like Kristy's approach of defining each inline css style as an object that you then call when building the HTML. The only thing I would change is to put the css objects inside of an overall object like so var CSS = { table: 'style="text-align:center;"'; }; Then you would use CSS.table inside of the HTML string.

@Kyle G. Hey thanks! I can't take the credit though, I totally stole the template from Steve K.'s OGL sheet and used DXWarlock's Health colours script as an example of how to implement it. EDIT: Just saw your post. Idea stolen. ;) @Marth Lowell Yes, you have to use inline css. It's a bit of a pain, but what I've seen others do (and stolen the idea myself) is to make the css a variable within your function. That way when you make a change, it almost acts like a separate css sheet - you only have to make the change in one place. An example: var divstyle = 'style="width: 189px; border: 1px solid black; background-color: #ffffff; padding: 5px; font-size: 12px;"'; sendChat('Test', '<div ' + divstyle + '>My fancy div</div>';