blockly > Events > BlockMove > oldParentId
Events.BlockMove.oldParentId property
The ID of the old parent block. Undefined if it was a top-level block.
Signature:
oldParentId?: string;
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Last updated 2024-09-18 UTC.
[null,null,["Last updated 2024-09-18 UTC."],[[["The `oldParentId` property stores the ID of the block's previous parent block before a move event."],["If the block was initially at the top level (not nested within another block), `oldParentId` will be undefined."],["This property is specifically part of the `BlockMove` event within Blockly's Events namespace."],["Developers can use `oldParentId` to track and respond to changes in block hierarchy during drag-and-drop interactions."]]],[]]