Using expressions, converters ...

[doktordirk]

Seems that personsStats != 0 & async: { property: value} or personsStats & async: { property: value} != 0 or personsStats | isNotZero & async: { property: value} or personsStats & async: { property: value} | isNotZero aren't possible.

one way to allow evaluation of the async bound value would be:

personsStats & async: { property: value, converter: isNotZero}

thoughts? other options (well, i could filter the stream, but i need that for several values separately. hence too much code repetition to be a good idea)?

edit: ah, asyncIsNotZero works: eg

import { filter} from 'rxjs/operators';

export class asyncIsNotZeroValueConverter {
  toView(stream, option) {
    return stream.pipe(
      filter(data=> data[option] !== 0)
    );
  }
}

<div repeat.for="attribute of attributes" if.bind="stats | asyncIsNotZero:attribute.name & async: { property: attribute.name}">

something more generic would be nice still

[zewa666]

Yeah like an async adapter for valueconverters. Essentially it could be as proposed with converter, but this breaks chaining and looks rather clunky right? Ideally we could use personStats | toAsync: isNotZero : otheropts & async: { ... }. In worst case the VC would have to be passed in as a string.

Another alternative would be to register async variants of VCs globally via code with ab alias, like in your sample asyncIsNotZero.