Allow hiding toastr via public method

[ilDon]

Issue type

I'm submitting a ...

• bug report
• feature request

Issue description

Current behavior:
Toastr can't be closed programmatically via a method like hide()/close().

If we set duration to 0 and destroyByClick to false, there is no easy way to get rid of the toastr.

Expected behavior:
It would be handy to destroy the toastr via a method exposed by NbToastrService. In this way we could do something like:

this.toastrService.show(message, title, toastrConfig);

Related code:
My current workaround is the following.

In the component where I show the toastr that I want to delete programmatically, I set this in the constructor:

constructor(
  private toastrService: NbToastrService,
  private containerRegistry: NbToastrContainerRegistry
) { }

Then, to delete the toastr, I do the following

const container = this.containerRegistry.get(this.toastrConfig.position);
const index = container['toasts'].findIndex(toast => toast.message === this.message && toast.title === this.title);
if (index > -1)
  container['toasts'].splice(index, 1);

The method exposed by NbToastrService could work in a similar fashion. Alternatively, it would be easier to make show() return the toast object, and then we could use that to close it, like so:

const toast = this.toastrService.show(message, title, toastrConfig);
toastrService.close(toast);

PS In my workaround I use container['toasts'] instead of container.toasts to avoid error messages on toasts being a protected property.

[Tibing]

Hi @ilDon, thanks for your feature request. If you want to help, please, feel free to submit pull requests 😄