[FIXED] javafx Check if an object exists in scene

Issue

I'm new to both java and javafx. How can I check if any object like Rectangle or Button exists in the Stack Pane or in the scene ? Tried searching in google but couldn't find anything related to the same.

Solution

To check if a Node (could be Button, Rectangle or any other UI node) is a direct child of another node (parent assumed, StackPane in your question) you can do the following:

stackPane = ...
if (stackPane.getChildren().contains(node)) {
    // node is a direct child of stackPane
}

Alternatively, you can call node.getParent() to obtain a reference to the parent node, if there is one.

Finally, by calling node.getScene() != null you can check if a node is part of a scene.

For full documentation refer to JavaFX API.

Answered By - AlmasB