Collapsing a TreeView

[K.Daube]

Dear friends,

My script to expand all nodes works fine. The contrary function to collapse all nodes, does not behave:

• This is the starting point, the tree is generated an the top nodes are closed
  
• Using button Expand makes the whole tree visible
  
• As long as the whole tree is visible, using Collapse works correctly
  
• If only part of the tree is visible and Collapse is used, nothing happens:
  

→ What could be wrong with FunCollapseAll?

function FunExpandAll(oTree) { // --- recursively used
// Reference    Peter Kahrel
var j, branches;
  oTree.expanded = true;
  branches = oTree.items;
  for (var j = 0; j < branches.length; j++) {
    if (branches[j].type == 'node') {
      FunExpandAll (branches[j]);
    }
  }
} // end of FunExpandAll

function FunCollapseAll(oTree) { // --- recursively used
var j, branches;
  oTree.expanded = false;
  branches = oTree.items;
  for (var j = 0; j < branches.length; j++) {
    if (branches[j].type == 'node') {
      FunCollapseAll (branches[j]);
    }
  }
} // end of FunCollapseAll

[K.Daube · Accepted solution]

The following 'brute force' method works:

// --- behaviour of the buttons
  wDocNav.g1.btnExpand.onClick = function () {
    FunExpandAll(oTree);
  }
  wDocNav.g1.btnCollapse.onClick = function () {
    FunExpandAll(oTree); // to avoid error with partial view
    FunCollapseAll(oTree);
    wDocNav.show();
  }

[ReedError]

I can't try this, but my guess is that you can't collapse a node if it's parent is already collapsed.

Is there a way you can work in the opposite direction for collapse?

Fold all of the lowest nodes first and work up the tree?