gantt: a '{event}' before-handler threw; the action was cancelled.

Warnings reference › gantt.beforeThrow:*

Identifier

gantt.beforeThrow:*

Raised by

Gantt

Since

1.36.0

What happened

A before-handler on the gantt controller threw. A throw is treated as a veto, so the edit, delete or dependency change did not happen, and the cancellation event fired with the reason. It is reported so that a cancel nobody asked for is not mistaken for a broken controller.

The fix

The error is attached to the console line. Return false (or call preventDefault()) to veto deliberately.

The smallest fix

gantt.on('beforeTaskEdit', (e) => { if (locked(e.task)) e.preventDefault('locked'); });

Reference

Covered in full at the API reference.