VTKJS cancelling reader promise

Web
1

Hi All,

Apologies if this is a really basic question or betrays a lack of understanding on my part.

I have a page where vtkXMLImageDataReader is used to load some data from the web. Using a sequence like this

var reader = new vtkXMLImageDataReader.newInstance({ fetchGzip: true });
reader.onModified(renderComponent);
reader.setUrl(dataUrl).then( () => reader.loadData() );

This works fine, but I want a way to cancel the reader promise, for example, if the user clicks away from the page and the component is no longer required. I tried calling a reader.delete() method, but vtkXMLImageDataReader does not seem to have this method.

Any help would be gratefully received.

Thanks

2

I don’t think we have cancelable promises in vtk.js.

Also a side note. With vtk.js you should not have a need for new. The newInstance() method create a new instance of that object for you.

3

Thanks, good to know.

To give a bit more detail what I am doing is using the reader inside a React component. So what I need is the best practice for the componentWillUnmount method.

Any suggestions are welcome.

4

You can do the network part outside of vtk.js and just pass the data once available if not unmounted before that.