Basics of one attribute + another for a derived attribute with Javascript on custom character sheet

I've been combing through the instructional articles for a very long time and it hasn't been helpful in setting something very basic up. All I'm trying to do is have two separate attributes get added together for a derived attribute. For example: agility + wit = reflex. Then for a few other derived attributes have a number add to that such as 4 + agility + wit. I haven't been able to figure out where to put the code, how to reference it, etc. I've deduced that an input area should have either an id=" " or a name=" ", then that can be referenced later in the javascript, which should be at the end of the code. But not exactly sure how.  The best I've been able to piece together so far is this... <div> <p>AG</p><input type="number" id="AG" value="0"> </input> </div> <div> <p>WT</p>     <input type="number" id="WT" value="0"> </input> </div> <div>      <P>Derived RF</P> <input type="number" id="RF" value="0"> </input>      </div> <script type="text/worker"> on("change:ag change:wt sheet:opened" , function() {     getAttrs( ["Ag, Wt"], function(values) {              }     ) }); // ... etc </script>

Look at the Building Character Sheets page on the roll20 wiki. You cant use ids on roll20, any styling has to use class. The attribute names are defined like "name="attr_NAMEHERE" so you input would be <input type="number" name="attr_AG" value="0" /> that said, you are better off using the attribute's full name, in lower case, so that would be: <input type="number" name="attr_agility" value="0" /> Your sheet worker would then be (again, changing all attribute names into their full name in lower case): on("change:agility change:wit sheet:opened" , function() {     getAttrs( ["agility", "wit"], function(values) {     // in the above line, note each attribute needs to have quotes around it                 let ag = +values.agility ||0;         let wt = +values.wit ||0;         let total = ag + wt;             setAttrs({             reflex: total         });     }); }); As a newcomer to sheet workers, you might find the following script useful: Multiversals Scroll down to Wes's post to see how to use it, and how easy it is to perform stuff like this. It's not the most efficient of scripts, but it's ideal for newbies.

Multiversals link added to the Sheetworker wiki article.

Wow thanks so much for helping out! I spent a lot of time going through the Building a Character Sheet page, and subsequent linked pages, and as someone new to javascript, even with someone's help who does web coding, doing some starting java introductions, etc., it was really hard to make sense of. This helps a ton. I can try to make more sense of this in the future, but that's enough to get a basic sheet up and running. YAY.

I'm glad it helped :) Good luck with your sheet!