Marker element click event throws: Uncaught TypeError: Cannot read property 'x' of null

[ParryQiu]

mapbox-gl-js version: 0.52.0

browser: macOS Chrome Version 71.0.3578.98 (Official Build) (64-bit)

Steps to Trigger Behavior

1. add a html marker;
2. add event by addEventListener to marker's html dom;
3. fire the event, throws the error: Uncaught TypeError: Cannot read property 'x' of null

Link to Demonstration

https://jsfiddle.net/ParryQiu/hnkwqfue/12/

console out put error:

vendor.js:51848 ERROR TypeError: Cannot read property 'x' of null
    at a.equals (vendor.js:18268)
    at HTMLDivElement.<anonymous> (vendor.js:18272)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (polyfills.js:2745)
    at Object.onInvokeTask (vendor.js:53986)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (polyfills.js:2744)
    at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (polyfills.js:2517)
    at ZoneTask.push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask [as invoke] (polyfills.js:2820)
    at invokeTask (polyfills.js:4066)
    at HTMLDivElement.globalZoneAwareCallback (polyfills.js:4092)
    at Map.<anonymous> (main.js:7314)

[cs09g]

Because startPos set when onMouseDown is triggered(bind_handlers.js#L155, L60). So, if click is triggered programatically, startPos is not set, then throw Error.

[mourner]

@cs09g good find! Want to submit a PR with the fix?

[cs09g]

@mourner sure :) but I'm off about a week for holiday so, it would be taking a week.

[ParryQiu]

@cs09g Thanks very much, I fixed this issue in local repository.
After doing some testing, consider submitting a PR.

[cs09g]

@ParryQiu Are you able to commit the fix?

[phirschybar]

+1 - having the exact same issue on v 0.53.1 and only seeing it when triggering a marker click programmatically.

[ParryQiu]

@cs09g
#8049