Custom Element MutationObserver about uhtml HOT 7 CLOSED

You need childList too

from uhtml.

uhtml knows nothing about ShadowDOM, so it'll keep updating the element content, not its shadow-root, which is expected (or better, it's by design, no ShadowDOM checks whatsoever as ShadowDOM has mode closed that would make it fail anyway).

However, if you instrument your observe to move within its shadowRoot nodes, everything should be fine:

      new MutationObserver((mutations) => {
        for (const {addedNodes} of mutations) {
          for (const node of addedNodes)
            this.shadowRoot.appendChild(node);
        }
      })

closing, as this is not something uhtml should solve, as it does exactly what it's expected to to 👋

from uhtml.

Nope. I understand that uhtml doesn't access Shadow DOM, that's not my intention. As per my example:

html`
  <custom-element>${someValue}</custom-element>
`

...I am looking for changes of the someValue inside the <custom-element> tag. That element has Shadow DOM attached but changes happen within the main template whis uhtml has access to.

from uhtml.

I think my example code works as expected already, right?

from uhtml.

Maybe my explanation is confusing. I am not seeing the MO gets triggered on re-render.

...after re-rendering the template serveral times I am seeing in the inspector that inner content of the element has changed, but...

...the observer has been triggered only on first render. No other render triggers the thing. Only accessing the element via textContent or appendChild triggers the event.

from uhtml.

When observing attributes I am getting the result I am expecting. But not with the inner content changes.

from uhtml.

Okay, I guess I have figured it out. I need to pass combination of options:

{
  characterData: true,
  subtree: true,
}

Thank you!

from uhtml.