Space Invaders

[alexkaufman06]

I tried following along with your video and got this error early on:
scripts.js:10

Uncaught TypeError: Failed to execute 'appendChild' on 'Node': parameter 1 is not of type 'Node'.

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Then I tried copying your files and got this error after about a second of game play on every refresh:
index.html:133

Uncaught SecurityError: Failed to execute 'getImageData' on 'CanvasRenderingContext2D': The canvas has been tainted by cross-origin data.

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I'm using chrome on a pc. Thanks for the awesome tutorial!

[maxwihlborg]

The first error is probably because you create the canvas incorrectly, make sure you have something like

this.canvas = document.createElement("canvas");

The second error is because of some security limitations when running local webpages in chrome. I try to explain it in the second video around 29m . To work around the error do you need to run the page from a webserver. If you have node and npm install look at http-server, you can also use python

cd ~/your/folder <-- cd into you folder
http-server <-- if node
python --version <-- check if and which python version that is installed
python -m SimpleHTTPServer <-- if python 2~
python -m http.server <-- if python 3~

[alexkaufman06]

I tried again following up to the first 14 minutes of the first video and I'm still having some troubles. No errors but nothing is loading. I tried this in both chrome and using python. I'm hoping it is a typo that I haven't noticed, but I'm not seeing anything. Feel free to glance my code if you have the time. Thanks!