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blockly > LineCursor > getPreviousNode
LineCursor.getPreviousNode() method
Get the previous node in the AST, optionally allowing for loopback.
Signature:
getPreviousNode(node: IFocusableNode | null, isValid: (p1: IFocusableNode | null) => boolean, loop: boolean): IFocusableNode | null;
Parameters
| Parameter |
Type |
Description |
| node |
IFocusableNode | null |
The current position in the AST. |
| isValid |
(p1: IFocusableNode | null) => boolean |
A function true/false depending on whether the given node should be traversed. |
| loop |
boolean |
Whether to loop around to the end of the workspace if no valid node was found. |
Returns:
IFocusableNode | null
The previous node in the traversal or null if no previous node exists.
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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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-05-16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 [LineCursor](./blockly.linecursor_class.md) \\\u003e [getPreviousNode](./blockly.linecursor_class.getpreviousnode_1_method.md)\n\nLineCursor.getPreviousNode() method\n-----------------------------------\n\nGet the previous node in the AST, optionally allowing for loopback.\n\n**Signature:** \n\n getPreviousNode(node: IFocusableNode | null, isValid: (p1: IFocusableNode | null) =\u003e boolean, loop: boolean): IFocusableNode | null;\n\nParameters\n----------\n\n| Parameter | Type | Description |\n|-----------|-----------------------------------------------------------------------------------|--------------------------------------------------------------------------------|\n| node | [IFocusableNode](./blockly.ifocusablenode_interface.md) \\| null | The current position in the AST. |\n| isValid | (p1: [IFocusableNode](./blockly.ifocusablenode_interface.md) \\| null) =\\\u003e boolean | A function true/false depending on whether the given node should be traversed. |\n| loop | boolean | Whether to loop around to the end of the workspace if no valid node was found. |\n\n**Returns:**\n\n[IFocusableNode](./blockly.ifocusablenode_interface.md) \\| null\n\nThe previous node in the traversal or null if no previous node exists."]]
