Page Updated:   2022-03-04

This is related to Editing(coding) Character Sheets, which require Pro info to be able to use. Main Page: Building Character Sheets

Main Page: Character Sheet Development

Code Validation

Main Page: Sheet Author Tips

It's a good idea to use a validator to check your code for mistakes in your code. Many IDE & text editors can install such extensions automatically, but given that Roll20 does a few things their own way, by default a HTML validator would complain about lot of things that aren't wrong, but just isn't accepted as standard HTML, such as <button type="roll"></button>.

• HTML: W3C's HTML Validator
  • initially give many warnings and errors on roll20-specific things, but you can filter away things that aren't wrong, and the list of error is quickly reduced to a manageable amount
  • Debugging HTML
• CSS: W3C's CSS Validator
  • Debugging CSS
• JavaScript(for sheetworkers & API): Closure Compiler for JS
• JSON(for translation files & sheet.json: jsonlint.com

Browser Dev Tool

Using the Firefox dev tools to inspect live sheet code

Using the built in Web Dev tools in your browser helps a lot with figuring things out. Both Firefox & Chrome (others) have their own versions.

Open it: pressing F12 or Right Click anywhere & select "Inspect".

• Firefox Web Developer Tools
• Chrome DevTools
  • Open with Cmd+Option+C (Mac), Ctrl+Shift+C

Sheet Dev Uses

• make live edits on you sheet and see how things change(like adjusting the width of a number input to look good)
• inspecting other's sheets to se how they achieved some specific effect.
• HTML/CSS debugging: figure out why something works or doesn't work in your code, to narrow down the problem, like why a css class is not working.
  • Debugging HTML and Debugging CSS
• sheetworkers/javascript debugging: reading the web console to figure out what's going on with your sheetworkers. Open the console and keep an eye on it when you use the sheet like normally & see what it reports.
  • Example: If you add something like console.log("ifWounded is trigger") or console.log("Set strength mod to" + strmod)() in your sheetworkers, you can see what steps that take place, what is left out, and know what values your variables have at different stages.)
  • JS Debugging in Chrome, and in Firefox

See Also

• Sheet Author Tips
• Sheet Development/Common Mistakes
• Sheet Development/Tutorials‎‎