Docs: Add note regarding the cancel option of sortable

[lessan]

When setting the cancel option for sortable, it overrides the default built-in cancel selector.

For example, if you set this:

$( ".selector" ).sortable({ cancel: 'button' });

Then any text boxes in the affected area will no longer cancel drag. See this blog post regarding the same issue: ​http://weblogs.asp.net/jeffwids/archive/2011/01/31/jquery-textbox-in-sortable-is-not-clickable-selectable.aspx

Could you please add a note to the docs (​http://jqueryui.com/demos/sortable/#option-cancel) stating this? For example:

Note: setting this option overrides the default of ':input,button'.

[Scott González]

It doesn't make sense to make a note about what the word default means for a single option. All options have defaults and explicitly setting the option always overrides the default.

[lessan]

I just realized that the default values are shown on the page (in a very obvious place too, facepalm!).

Sorry for the ticket, you're absolutely right there's no point adding a note stating the obvious.

[rgj]

What's not so obvious is that cancelling drag will also prevent any clicks in a text input field or select element. It really would help to add this as a little note to the documentation.

"Prevents sorting" is really something different from "Prevent working"

​http://jsfiddle.net/cv5ar8g6/1/