I have been using web components for those things. They actually pair great with htmx. Once you import a my-datepicker or my-modal web component it automaticall

I have been using web components for those things. They actually pair great with htmx. Once you import a my-datepicker or my-modal web component it automatically works anytime it appears in the DOM. So htmx can ajax in some HTML and you don't have to wire up an JavaScript to it to get rich interactions. Check out Shoelace (https://shoelace.style/ https://shoelace.style/) for a good set of components.