[treeview] add focus and highlight feature

[quaff]

it is not easy to focus a tree item currently,I hope jquery treeview provide a simple way to do such opration like this: 1. $('#three').treeview();all collapsed $('#three').treeview({focus:'#13'});make all parents of #13 expanded 2. add class 'active' to tree item span element which is activated by user click event or treeview focus,and highlight this active tree item.

[quaff]

it is not easy to focus a tree item currently,I hope jquery treeview provide a simple way to do such opration like this:

1. $('#three').treeview();all collapsed $('#three').treeview({focus:'#13'});make all parents of #13 expanded

2. add class 'active' to tree item span element which is activated by user click event or treeview focus,and highlight this active tree item.

[dmethvin]

This is not a jQuery core bug. Please report plugin bugs to the plugin's author, or ask on the jQuery forums. jQuery UI bugs should be reported on the UI bug tracker, ​http://dev.jqueryui.com .