Update jquery.ui.treemap.js

[sekharreddykasu]

Double click event added

[evancarey]

Hi sekharreddykaau,

Thanks for your pull request. I checked out your branch and did some testing. Unfortunately, I found that only the click event is triggered. Were you able to get the double click event? I tested using Chrome and Firefox. After a little digging I found the comment below on the page http://api.jquery.com/dblclick/

'It is inadvisable to bind handlers to both the click and dblclick events for the same element. The sequence of events triggered varies from browser to browser, with some receiving two click events before the dblclick and others only one. Double-click sensitivity (maximum time between clicks that is detected as a double click) can vary by operating system and browser, and is often user-configurable.'

Along with that quote I also found some various work arounds using timeouts and such.
http://stackoverflow.com/questions/6330431/jquery-bind-double-click-and-single-click-separately

It looks like adding support for dblclick is trickier than you'd expect.

At this point I'm thinking since determining if there's been a double click or not can be handled outside the jsTreemap plugin and in the user's implementation of their treemapclick handler instead.

Also, the update to the line
var i = Math.floor(val_(map.length/4-1))4;
to
var i = Math.floor(val(map.length/4))_4;
will cause a maximal val to get the undefined color black.