I have an Ionic 2 beta 7 application (also appears in beta 6) that uses the Google Maps JavaScript API.
If I click on a map, drag it and “drop” the map before releasing the click, it causes this error the next time I try to drag the map.
Here is the JavaScript stack trace
TypeError: Cannot read the 'ca' property from null on .r.Kj ( https://maps.googleapis.com/maps-api-v3/api/js/25/7/common.js:215:70 ) in Object..B.trigger ( https://maps.googleapis.com/maps/api/js?key=MYKEY:93:119 ) at dy ( https://maps.googleapis.com/maps-api-v3/ api / js / 25/7 / common.js: 164: 140 ) c. ( https://maps.googleapis.com/maps-api-v3/api/js/25/7/common.js:163-00-0041 ) in Object._. B.trigger ( https://maps.googleapis.com/maps/api/js?key=MYKEY:93:119 ) on .r.dl ( https://maps.googleapis.com/maps-api-v3/ api / js / 25/7 / common.js: 228: 350 ) on Kv..r.fm ( https://maps.googleapis.com/maps-api-v3/api/js/25/7/common. js: 195: 106 ) in ZoneDelegate.invokeTask ( http: // localhost: 8100 / build / js / zone.js: 356: 38 ) in Zone.runTask ( http: // localhost: 8100 / build / js / zone. js: 256: 48 ) in ZoneTask.invoke ( http: // localhost: 8100 / build / js / zone.js: 423: 34 )
Although this does not seem to cause user interface problems from a user perspective, it would be nice to know if there is a way to prevent this?
Note
When dragging a card and freeing it when the mouse is static, this error does not occur the next time you drag it.
Plunger example
I created a Plunker example that replicates a problem. Follow these steps:
Developer Tools
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The trace and title of the question stack has been updated to match what was discovered in Ionic 2 beta 10
GitHub Track
This issue was raised on the ZoneJS GitHub page so you can track it here.
To notify anyone who did not follow this issue on GitHub (the one I linked in this question), this bug was fixed in ZoneJS version v0.16.7