# Bind Callback to Interaction
**URL:** https://discourse.vtk.org/t/bind-callback-to-interaction/7269
**Category:** Web
**Created:** [November 24, 2021, 3:53pm UTC](https://discourse.vtk.org/t/bind-callback-to-interaction/7269 "2021-11-24T15:53:47Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@bernland](https://discourse.vtk.org/u/bernland)
#### Post date: [November 24, 2021, 3:53pm UTC](https://discourse.vtk.org/t/bind-callback-to-interaction/7269/1 "2021-11-24T15:53:47Z")
What’s the most top-level approach to capturing interactions in VTK.js?
I understand that there are a number of specific methods, such as onMouseMove(), onLeftMouseDown(), etc.
Is there a more general way to capture all such methods?
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### Author:  [@Sebastien\_Jourdain](https://discourse.vtk.org/u/Sebastien_Jourdain)
#### Post date: [November 24, 2021, 5:48pm UTC](https://discourse.vtk.org/t/bind-callback-to-interaction/7269/2 "2021-11-24T17:48:00Z")
Are you trying to create an interactor style? Usually you create a class that inherit [vtkInteractorObserver](https://github.com/Kitware/vtk-js/blob/6e82cca81afe646206a1e12baed95b9aab329f73/Sources/Rendering/Core/InteractorObserver/index.js) or use the manipulator style to compose various interactors to specific interaction/modifier.
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### Author:  [@bernland](https://discourse.vtk.org/u/bernland)
#### Post date: [November 25, 2021, 8:45am UTC](https://discourse.vtk.org/t/bind-callback-to-interaction/7269/3 "2021-11-25T08:45:22Z")
Are there any examples on building custom classes that inherit **vtkInteractorObserver**?
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### Author:  [@Sebastien\_Jourdain](https://discourse.vtk.org/u/Sebastien_Jourdain)
#### Post date: [November 25, 2021, 9:03pm UTC](https://discourse.vtk.org/t/bind-callback-to-interaction/7269/4 "2021-11-25T21:03:52Z")
All the [interactor styles](https://github.com/Kitware/vtk-js/tree/master/Sources/Interaction/Style) classes