This plugin enables HTML Markup within an APEX Tree Region which normally escapes all HTML Special characters. The idea is to use replacement characters for "<", ">" and "&" in the Tree SQL query and to configure these in the plugin. The plugin fires as a dynamic action after page load and uses some jQuery logic to activate the HTML markup by changing the replacement characters back to HTML syntax.

A note about the security topic: 

The reviewer below is right - using the plugin might introduce an XSS vulberability if tree contains end-user supplied content.

The plugin is as secure or insecure as the "Standard Report Column" setting in an normal APEX report. So if you are using it make sure that all tree content is not derived from end users or that end user content has been checked beforehand.

Example APEX Tree SQL query:

select case when connect_by_isleaf = 1 then 0
            when level = 1             then 1
            else                           -1 
       end as status, 
       level,
       case
          when sal < 2500 then  '[b style="color: green"]'||"ENAME"||'[/b]§nbsp;[img xsrc="/i/Fndokay1.gif" height="12"]'
          when sal < 4500 then  '[b style="color: black"]'||"ENAME"||'[/b]' 
          else                  '[b style="color: red"]'||"ENAME"||'[/b]'
       end as title, 
       null as icon,  
       "EMPNO" as value,  
       null as tooltip,  
       null as link  
from "EMP" 
start with "MGR" is null 
connect by prior "EMPNO" = "MGR"
order siblings by "ENAME"

Plugin configuration:

• Pattern for "<": [
• Pattern for ">": ]
• Pattern for "&": §

Changelog:

Version 1.0:

initial release

Version 1.1:

added plugin parameter for unbinding the mouse click and double click handlers added by the tree component. Use this if your tree links are not working together with this plugin