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blockly > Workspace > addChangeListener
Workspace.addChangeListener() method
When something in this workspace changes, call a function. Note that there may be a few recent events already on the stack. Thus the new change listener might be called with events that occurred a few milliseconds before the change listener was added.
Signature:
addChangeListener(func: (e: Abstract) => void): (e: Abstract) => void;
Parameters
| Parameter |
Type |
Description |
| func |
(e: Abstract) => void |
Function to call. |
Returns:
(e: Abstract) => void
Obsolete return value, ignore.
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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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-05-16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."],[[["The `addChangeListener` method allows you to execute a function whenever changes occur within the Blockly workspace."],["The provided function will be called with an `Abstract` event object detailing the change, potentially including events that happened shortly before the listener was added."],["The method's return value is obsolete and should be ignored."]]],[]]
