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blockly > FocusManager > isRegistered
FocusManager.isRegistered() method
Returns whether the specified tree has already been registered in this manager using registerTree and hasn't yet been unregistered using unregisterTree.
Signature:
isRegistered(tree: IFocusableTree): boolean;
Parameters
Returns:
boolean
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Last updated 2025-05-16 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-05-16 UTC."],[],[],null,["[blockly](./blockly.md) \\\u003e [FocusManager](./blockly.focusmanager_class.md) \\\u003e [isRegistered](./blockly.focusmanager_class.isregistered_1_method.md)\n\nFocusManager.isRegistered() method\n----------------------------------\n\nReturns whether the specified tree has already been registered in this manager using registerTree and hasn't yet been unregistered using unregisterTree.\n\n**Signature:** \n\n isRegistered(tree: IFocusableTree): boolean;\n\nParameters\n----------\n\n| Parameter | Type | Description |\n|-----------|---------------------------------------------------------|-------------|\n| tree | [IFocusableTree](./blockly.ifocusabletree_interface.md) | |\n\n**Returns:**\n\nboolean"]]
