Tree : max level and initially expanded

Question

Hi,
we have build a tree region that shows our organization. If we set the max level to a given value (say 2) it will open the tree with the first two levels expanded (as expected).
If we expand more levels, it will shift the description of non-leaf nodes that are beyond the max level. This seems to be due to a problem in the calculation of the #COLSPAN# pseudo columns.
Does anyone have similar experience? Did you find a workaround?
Thx in advance
Daniel

Answer 1

I searched through the docs of jstree 0.9.9a2, which comes with apex 4+, and through apex.widget.tree, but couldn't find any function which does what you describe. However, it can be emulated fairly easily.
Add this code to the page javascript:
function resetAndOpenToLevel ( pTree, pMaxLevel ) {
   apex.jQuery.tree.reference(pTree).close_all();
   $("ul", pTree).each(function ( index ) {
      if ( $(this).parents("ul").length <= pMaxLevel ) {
         apex.jQuery.tree.reference(pTree).open_branch(this);
};When called this will open up the nodes of the given tree up to (and including) pMaxLevel.
For convenience, give your tree region a static ID.
For example,define a button which triggers a dynamic action with execute javascript code as true action:
resetAndOpenToLevel ( $("#my_tree_region_id div.tree"), 2) ;Would reset the tree, and then open nodes up to and including level 2.
You can try it out on my example tree page, where i included this code: http://apex.oracle.com/pls/apex/f?p=54687:38 There I'm using a global javascript variable to store a reference to the tree element rather than fetching it every time.