Recently I wanted to test the ajax capabilities from cakePHP and after setting up the links to prototype.js and scriptaculous.js just as shown on cakePHP website, I’ve noticed the ajax is not working.

In the javascript error console I noticed the error:
JsController could not be found

The problem was that I thought cake will include the above js files automatically from it’s core libraries. Of course it doesn’t so to solve the problem just download prototype.js and scriptaculous.js and place them in the js directory inside webroot

That’s it!