May 8, 2010

Testing Javascript Apps with Chrome

While testing a Javascript app under Chrome today, I learned something interesting. If the HTML/JS file you're viewing in Chrome is located on the local drive (ie. you're accessing it via file:///...) then you're not normally able to use AJAX to request other files on the local hard drive. I tried doing the following in jQuery:
$.getJSON("local/file/on/hard-drive", function (response){
  // blah blah blah
Every single time, the response variable would come out as null. I wasn't sure what happened, but after a quick Google search I learned that in order to make Chrome play nice with local files, you need to disable web security:
google-chrome filename.html --disable-web-security
After this it seems to work just fine! Now to fix the other bugs...

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