Not sure, I just again came in search of this functionality again two days back so I checked the PR to see why it hadn’t gone forward – just appears abandoned.

The updated solution from begleynk worked like a charm for me though.

Crossposting suggested solution for future searchers:

def toggle_expanded(js \\ %JS{}) do
  js
  |> JS.remove_class(
    "expanded",
    to: "#outer-menu.expanded"
  )
  |> JS.add_class(
    "expanded",
    to: "#outer-menu:not(.expanded)"
  )
end

It adds the class if it does not exist on the element and removes it if it does.

I came here to ask this just now trying to make an indicator transform 180 degrees and not disappear.

https://github.com/phoenixframework/phoenix_live_view/pull/1721

It looks like its not in master yet.

I’m using dispatch for now:

js = JS.dispatch(js, "icon:rotate-180", to: "#accordion")

window.addEventListener("icon:rotate-180", e => {
    e.target.classList.toggle("transform-rotate-180")
});

Is there a reason to not merge the PR? Seems like a really popular request and also something built in to JS/DOM with classList.toggle? Maybe it adds too much complexity? Is the PR bad?