Duplicate keys after tree is loaded from URL about fancytree HOT 4 CLOSED

Are you sending key data with the server's JSON response? In this case FT will not generate dummy keys, so counter is not incremented.
If you leave the key data undefined, I would assume that the counter is incremented.
However: why are you getting duplicate keys? I can only think this can happen if you send keys, that have the same pattern (_ + NUMBER)

Please explain a bit more.

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My program allows to edit the tree.
Every time the tree is changed, it is saved as JSON to the server.
When the program is restarted later, the tree gets restored by loading the JSON from an URL from the server.

Save goes like this:
var tree: Fancytree.Fancytree = $.ui.fancytree.getTree("#tree");
var mytree = tree.toDict(true);
if (!mytree.children) mytree.children = []; // This is necessary if tree is empty, otherwise there is an error loading the tree later
var treeData: string = JSON.stringify(mytree);
// now treeData is sent to the server for later reload

Load goes from URL like shown in my post.

The keys are restored from the server, but _nextNodeKey is not set.
So if the user adds a new node, there are duplicate keys.

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Temporary keys aren't meant to be persisted, for the above reasons.
Alternatives could be to generate real keys server-side (if you need keys), or just don't send them at all (if you don't need keys in your data model).

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Ok, thanks! But I think it would be good if there were functions to easily just save and later reload a tree to the exact same state, without having to delete or recreate keys.
And without having to add an empty children array when the tree is empty.

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