What is the process for implementing a new control value accessor?

I have a directive that already implements the ControlValueAccessor interface (directive's selector is input[type=date]) and now I need another directive that also implements ControlValueAccessor with the selector input[type=date][datepicker] - let's name it the datepicker directive.

Both directives have selectors that overlap, causing an error when using the datepicker directive:

ERROR Error: Uncaught (in promise): Error: More than one custom value accessor matches form control with unspecified name attribute

The error can be traced back to this location: https://github.com/angular/angular/blob/5.2.x/packages/forms/src/directives/shared.ts#L206

I am thinking of a way to instruct Angular to provide the datepicker directive whenever possible, but I'm not sure how to achieve that. Any ideas?

angulartypescriptangular-directiveangular-di

Answer №1

Have you considered experimenting with the selectors?

The initial option could be

input[type=date]:not([datepicker])

And then there is a second possibility

input[type=date][datepicker]

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