DialogCancelError - class or interface? #323
Description
I'm submitting a feature request
- Library Version:
aurelia-dialog 1.0.0-rc.1.0.3
(I think the other bug template questions don't apply to a feature request but I can provide if required)
I'm using aurelia-dialog to confirm an action that gets posted to the server to change some object. It seems using rejectOnCancel is a good way to skip over the promise chain that deals with successfully changing the object. In the catch handler I need to differentiate between the respective DialogCancelError or some other error (e.g. from the httpClient).
Because DialogCancelError is an interface and not a class, I can't use the simple pattern to detect the type of error:
catch(error => {
if (error instanceof DialogCancelError) {
// handle the dialog cancel action
} else {
// handle a http method error
}
}
Instead I have to use some sort of duck-typing.
My feature request (and I could create a PR if someone likes the idea) is to use a class instead so that I can use the pattern above.
If there's a better way of doing this, please let me know! I would rather not set rejectOnCancel: false because it's a very neat way of skipping the rest of the promise chain which would otherwise require passing and checking this cancel state through each then() method:
someMethod() {
this.dialogService.open({
viewModel: ...,
model: ...,
rejectOnCancel: true
}).whenClosed(response => {
this.busy = true;
return this.service.someServerMethod(...);
}).then(() => {
// do stuff if the server method is successful, such as notifications, updates, etc.
// there may be multiple then() handlers chained up here
}).catch(error => {
if (error instanceof DialogCancelError) {
// handle the dialog cancel action
} else {
// handle a http method error
}
}).then(() => {
this.busy = false;
});
}