lit | Track scores in Literature | Game Engine library

The sql part of the string can be used as parameter for expr to recreate the original column object.

You can always use classMap or styleMap directives for the dynamic styling in the Lit Component. More information available at Dynamic classes and styles.

I solved my problem: I replaced everything within the for loop with:

You don't need to have the when statement here because you don't care if there is already data in the column or not, just overwrite it with None. Just do

It's not possible to dispatch a single Event instance more than once, so even if you could modify the composed property of the original event you couldn't redispatch it anyway.

So you need to create a new event to dispatch from your custom element, but the details of how exactly you want to create the event and what it should contain will probably depend on your use case. I'd suggest to try to keep it as simple as possible and make an event that includes the information you need and then dispatch it.

There's probably a reason why the native change event is not composed, but you can simulate propagating it out of your custom element by creating an event with the name change and dispatching it from your custom element. You probably don't even need to use composed in most cases as just dispatching it from your custom element (this) makes it available in the parent scope (one level up from your shadow root) which is where the event probably should be handled in most cases.

The fact that you have an in your shadow root should probably be treated as an implementation detail (at least in some cases) and not exposed outside unnecessarily, but when you do need to expose it directly, you can make it available e.g. as a property on your custom element (which could then be accessed from your custom event) or you can include a reference to it in the event object (e.g. in detail property of CustomEvent or a property of a custom event class).

For example here's how Vaadin components like propagate the change event:

I manage to solve the problem. I had to use the following function

@Mark. Let me try to clarify the confusion points that you have.

The definition of Exp that we are assumming in page 10 is:

Use when-otherwise to populate values conditionally-

This is the answer to my problem: I needed to scan the individual channels to determine which one was being pressed. Here is the code, in case anyone is interested: