jQuery UI - Draggable is not a function?

Question

I\'ve trying to use the draggable effect on some divs on a page, but whenever I load the page, I get the error message:

Error: $(\".draggable\").draggable is         


        

Answer 1

I had the same problem for another reason and my eye needed one hour to find out. I had copy-pasted the script tags that load jquery :

My website was using https when accessed from a mobile browser and refused to load jquery-ui without https.