Blazor should have something like an angular directive

[rekna1]

Summary

Angular directives adds behavior to existing HTML elements. This has the benefit that all attributes and default events of the HTML element remain accessible from HTML.

Motivation and goals

• as soon as you make a custom component you have to try to foresee every attribute/event you might need on the embedded HTML element.
• angular directives on the other hands, allow to add behavior to an existing standard html element, leaving all attributes and events accessible from template

In scope

• allows to extend behaviour of any type of standard html element with ease
• might even provide defaults for components

Out of scope

Risks / unknowns

Examples

• drag drop capabilities to existing html elements
• add configuration to a component ( e.g. consider an autocomplete component with some configuration, you could add reusable configuration / handlers by adding a directive, still allowing for customisation in the html template)

[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[SteveSandersonMS]

Duplicates #5607