Abstract class error

[danielmcquillen]

I was using chartjs successfully in my AngularDart project up until this morning when I started upgrading to the 2.0.0 official public release (I was using the 2.0.65 dev release).

The compiler now complains about code like this

ChartXAxe xAxe = new ChartXAxe();

with an error of:

error: Abstract classes can't be created with a 'new' expression.

Am I using the library wrong when I try to instantiate things like ChartXAxe when building up my chart in the component .dart class?

[danielmcquillen]

Sorry, I forgot this is the same issue as the one @portno logged: https://github.com/google/chartjs.dart/issues/22 .

[kasumi21]

I'm not sure if it's the same error: I started to upgrade to Dart 2.0.0 (official stable release), I'm using chartjs: ^0.5.0 and in the javascript I imported the Chartjs 2.6.0 (like the example), but still I have this errors: Error: The class 'ChartAnimationOptions' is abstract and can't be instantiated. Error: No named parameter with the name 'duration'. Error: The class 'ChartTooltipCallback' is abstract and can't be instantiated. Error: No named parameter with the name 'title'. Code: ChartConfiguration config = new ChartConfiguration( type: 'doughnut', data: data, options: new ChartOptions( animation: new ChartAnimationOptions(duration: 0), tooltips: new ChartTooltipOptions( callbacks: new ChartTooltipCallback( title: allowInterop((tooltipItems, data) { return data.labels[tooltipItems[0].index] + ": " + "${data.datasets[tooltipItems[0].datasetIndex].data[tooltipItems[0].index]}%"; }), label: allowInterop((tooltipItem, data) { return; })))));

With the previous version of dart worked.

[enyo]

Yup, just ran into the same issue. Seems as if the external factory constructors for some classes are missing.

[enyo]

Is there any update on this?

[romanoffs]

I have the same problem. When I try to inherit an abstract class, I get the error: Uncaught TypeError: Class extends value undefined is not a constructor or null

[kevmoo]

Pull requests are welcome. I built this sample out as example of Dart-JS interop. I don't have the bandwidth to maintain it actively.

On Sat, Oct 6, 2018 at 2:38 AM Денис notifications@github.com wrote:

I have the same problem. When I try to inherit an abstract class, I get the error: Uncaught TypeError: Class extends value undefined is not a constructor or null

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/google/chartjs.dart/issues/26#issuecomment-427560273, or mute the thread https://github.com/notifications/unsubscribe-auth/AABCisFYGMYBZnGTwlBGnf41a9PMuWLgks5uiHodgaJpZM4Vy-GI .

[romanoffs]

Pull requests are welcome. I built this sample out as example of Dart-JS interop. I don't have the bandwidth to maintain it actively. … On Sat, Oct 6, 2018 at 2:38 AM Денис @.**> wrote: I have the same problem. When I try to inherit an abstract class, I get the error: Uncaught TypeError: Class extends value undefined is not a constructor or null* — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#26 (comment)>, or mute the thread https://github.com/notifications/unsubscribe-auth/AABCisFYGMYBZnGTwlBGnf41a9PMuWLgks5uiHodgaJpZM4Vy-GI .

Thank you! I have already added the factories I need

[Timmmm]

ChartAnimationOptions is still missing its options. I'd add it but I'm not sure how to handle the callbacks. :-/