Error in FS.createPreloadedFile: request for Module['canvas']?

[polymeris]

After adding a text file with --preload-file, I started to get the following error:

Uncaught TypeError: Cannot read property 'requestPointerLock' of undefined tox.js:6883
Browser.init tox.js:6883
FS.createPreloadedFile tox.js:3978
DataRequest.finish tox.js:104
DataRequest.onload tox.js:99
processPackageData tox.js:128
start tox.js:68
xhr.onload

The "undefined" value is actually Module['canvas']
The culprit seems to be src/librarybrowser.js:198

      var canvas = Module['canvas'];

      // forced aspect ratio can be enabled by defining 'forcedAspectRatio' on Module
      // Module['forcedAspectRatio'] = 4 / 3;

      canvas.requestPointerLock = canvas['requestPointerLock'] ||
                                  canvas['mozRequestPointerLock'] ||
                                  canvas['webkitRequestPointerLock'] ||
                                  canvas['msRequestPointerLock'] ||
                                  function(){};

My program doesn't even use canvas (and the loaded file is not an image or animation), so I don't understand what the purpose of this code is.

Edit: Issue #1042 might be related.

[kripken]

I think your project's html file does not define a canvas? I pushed a commit now to incoming to not set up the events if a canvas is not present, does that fix it?

[polymeris]

Yes, that does the trick. Thanks, @kripken