has_node() return true but find_child() return null?

Question

            if subCate0.has_node("craft_item"):
                item0=subCate0.find_child("craft_item")
            if not item0:

hasnode return true so code run second line successful. but findchild return null which enter the next if block

Need to be mentioned is that this code is in a loop(for) block, the first time run it was works. In the scenetree l post below, it handle the node named throwingweapon(variable cateSub0) and cobble(named craftitem before)

Comments

Would get_node not acheive what you are trying to do. I looked in the Node documentation and couldn't find the find_child function.

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@godot_dev - note this is a Godot 4-related question.

https://docs.godotengine.org/en/latest/classes/class_node.html#class-node-method-find-child

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What does your scene tree look like? Specifically, what node is the above script attached to and where is the craft_item node with respect to it?

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The script attach to an Autoload node so is the child of root. Craftitem is the child of subCate0, they are the part of the UI "deskpanel". Deskpanel's path:"root/Main/CanvasLayer/UI/deskpanel"

deskpanel.printtree() look like(var subCate0 here named weapon):

╴deskpanel
┠╴@@5
┖╴tool
┠╴VSplitContainer
┃ ┠╴throwingweapon
┃ ┃ ┠╴Label
┃ ┃ ┖╴cobble
┃ ┠╴weapon
┃ ┃ ┠╴Label
┃ ┃ ┖╴craft_item

Answer 1

l read the doc and find out the reason! l change the code like:

item0=subCate0.find_child("craft_item",true,false)

And it works. The thrid arg is owned, doc:

 if owned is true, this method only finds nodes who have an assigned Node.owner.

thx everyone here :)