Poppable: Placement of {top:0, left:0} does not work

[DieTapete]

Prerequisites

• I am running the latest version
• I checked the documentation and found no answer
• I checked to make sure that this issue has not already been filed

Demo Page

https://codepen.io/dietapete/pen/OJxGgVQ

Explanation

• What is the expected behavior?
  Poppable should show at 0,0

• What is happening instead?
  Poppable is not showing at all (placement-hidden class is added)

[ykadosh]

Hi @DieTapete

There are a few issues with your example:

1. You're not passing a reference to <Poppable/>, which is why you're modal is hidden. You should pass it like so:

const App = () => {
  const ref = useRef();
  return (
    <div>
      <button ref={ref}/>
      <Poppable reference={ref}/>
    </div>
  );
}

2. You're getPlacements function returns [{top: 0, left: 0}]. You should calculated those values based on the rbr (reference bounding rect, i.e. the button) and tbr (target bounding rect, i.e your modal):

const getPlacements = (rbr, tbr) => [
  {top: rbr.top - 100, left: rbr.left}
];

[ykadosh]

I see now that you wanted it to appear at [0,0], and indeed it considers it to be hidden in that case.
@yairEO we use [0,0] as a hidden placement

see:

• https://github.com/open-amdocs/webrix/blob/master/src/components/Poppable/Poppable.constants.js
• https://github.com/open-amdocs/webrix/blob/master/src/components/Poppable/strategies/index.js#L34

@DieTapete meanwhile you can use [1,1] until we fix this...

[DieTapete]

thanks for taking care of this. i'm using [1,0] for the time being ;)

[yairEO]

@ykadosh - what is a "hidden placement" purpose? why 0, 0 is so?
I'm unsure how to address this bug because I don't know the reason behind this logic:

export const HIDDEN_PLACEMENT = {top: 0, left: 0, name: 'hidden'};

[ykadosh]

@yairEO I don't recall all the original reasoning, but the HIDDEN_PLACEMENT is used both for hiding the <Poppable/> (initially or when the target is missing), and as a communication device between the different "recovery strategies".

So there are a few recovery strategies, i.e. trap(), reposition() and hide(), and we have some logic to use them based on their output (see: https://github.com/open-amdocs/webrix/blob/master/src/components/Poppable/strategies/index.js#L33)

Since their output is an object with top and left, we used a special object to indicate the special case of when the <Poppable/> is hidden.
We need to find a better way to communicate between those functions, but keep in mind that the final output must be a positioning object (with top and left).

[DieTapete]

Maybe it's not the "right" solution but would it be enough to set the hidden placement to something like Infinity?

[ykadosh]

The placement object must be something that can be used in CSS to position the popup, so Infinity cannot work unfortunately.