Expand Tree to a specific level

Question

How can I use node.setExpanded(true); to expand the tree only to a certain level?

What I mean is that I've got 6 depth-levels and only want 5 to be expanded -- the last one should be excluded.

A recursive function passing the remaining level count would do, but you really need to show the code you have attempted :) — iCollect.it Ltd, Oct 01 '14 at 08:49

score 5 · Accepted Answer · answered Oct 15 '16 at 12:19

5

    $("#treeView").fancytree("getRootNode").visit(function(node){
        if(node.getLevel() < 3) {
            node.setExpanded(true);
        }
    });

answered Oct 15 '16 at 12:19

Grumpy

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It would be best to explain how this code helps the OP, especially as there is an existing accepted answer on this two year old question. – Heretic Monkey Oct 16 '16 at 22:57
it was vital back then but thanks for the approach :-) maybe it helps somebody else too :-) – Andreas Zeiner Mar 19 '18 at 17:27

score 2 · Answer 2 · answered Oct 01 '14 at 09:09

2

This is just a guide, as you have provided no sample data or code, but you can use a recursive function to iterate the tree, stopping when a specific depth is reached. Something like:

function expandNode(node, depth) {
    // Expand this node
    node.setExpanded(true);
    // Reduce the depth count
    depth--;
    // If we need to go deeper
    if (depth > 0) {
        for (var i = 0; i < node.children.length; i++) {
            // Go recursive on child nodes
            expandNode(node.children[i], depth);
        }
    }
}

and call it with the root node and overall depth:

expandNode(rootNode, 5);

There may well be better methods to iterate a fancytree, but I have not used fancytree before

answered Oct 01 '14 at 09:09

iCollect.it Ltd

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thanks a lot, sorry for not providing any code. i've used $("#tree").fancytree("getRootNode").visit(function(node){ node.setExpanded(true); }); for expanding every node beginning from the rootnode! – Andreas Zeiner Oct 01 '14 at 13:47
@Andreas Zeiner: Code and example html would have meant a working demo, but you get the idea from this example I hope :) – iCollect.it Ltd Oct 01 '14 at 13:48
works perfekt! you're a star and may the last ninja be with you :-) yes a played them all on the c64 - been there since 1985! – Andreas Zeiner Oct 01 '14 at 14:28
you could also use `node.visit(...)`and `if( node.getLevel() < 6)...` – mar10 Oct 01 '14 at 16:30
@mar10: That's the `fancytree` specific stuff I don't know about. Why don't you post an answer? – iCollect.it Ltd Oct 01 '14 at 16:32

Expand Tree to a specific level

2 Answers2