Error multitouch emit undefined inside move function

[jjjkolkh]

When using a device with multitouch I get an error when outside the chart something is pressed first and held down and afterwards pressing inside the chart.
The error is as following:
TypeError: Cannot read property 'brush' of undefined
TypeError: emitter(...).moved is not a function
TypeError: emitter(...).ended is not a function

Tracing the issue in the D3 bundle I found out that the move function is called before the emit variable is set:

Online debug information:
ContextListener is called first with a TouchStart event

Then inside the started function the move function will be called

Inside move function the emit variable is undefined, hence throwing the error

[Fil]

thanks. can you share a (minimal) code to reproduce?

[jjjkolkh]

See the following file:
D3issue.zip

In here I replicate how the XYChart is being handled in my application.

[Fil]

Can you please confirm that #84 would resolve this issue?

[jjjkolkh]

Sure, thanks!
I need the touch panel to test it for sure though, so I'll do it on Monday morning as it's in the office.

[jjjkolkh]

Hi Fil,
I can verify that on my system the error is now gone!
It's also behaving as expected.

[Fil]

Excellent! Thank you for the feedback.

[dvdwndrdl]

Hi, we are still having issues with this problem. Please see the stack trace below. We are using both packages d3 and d3-brush (as a dependency of d3) in the latest versions, i.e. 7.6.1 and 3.0.0, respectively. Please note that the error occurs only if using a touchscreen (e.g. by using the Google Chrome User Agent). Do you have any ideas or suggestions for us? Thanks in advance!

ERROR TypeError: emitter(...).ended is not a function
    at SVGGElement.touchended (brush.js:585:30)
    at SVGGElement.<anonymous> (on.js:3:14)
    at _ZoneDelegate.invokeTask (zone.js:443:35)
    at Object.onInvokeTask (core.mjs:26218:33)
    at _ZoneDelegate.invokeTask (zone.js:442:64)
    at Zone.runTask (zone.js:214:51)
    at ZoneTask.invokeTask [as invoke] (zone.js:525:38)
    at invokeTask (zone.js:1727:22)
    at globalCallback (zone.js:1758:31)
    at SVGGElement.globalZoneAwareCallback (zone.js:1794:20)

[Fil]

Please share a webpage or an observable notebook that exhibits the issue.