I'd like to have an OnTaskDoubleClick event for the Gantt tasks, so a I can handle it to include some custom logic instead of displaying a popup to edit the task.

ShowWorkHours in the Gantt timeline

Expose an OnItemRender event, which is raised for each Gantt Timeline task. The args should allow setting a Class, that will be applied at the topmost element of the item itself.

Is it possible to change the format of the displayed date at the top of the chart? (See the screenshot) Also, I would like to know what to do if possible.

I would appreciate it if you could hold a reply.

in the demo, the percentage display can be over 100%.
As soon as it is over 100% there, the following error is displayed:

(this also happens because it is always incremented by 1, which then always corresponds to an additional 100%.)

 

 

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ADMIN EDIT

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In the meantime, a possible workaround could be to use the built-in validation and set values 0 to 1 for the Range attribute of the Percent Complete field. The attached example demonstrates how to achieve that.