Add valueAsInt and valueAsDouble to dart:html

[sethladd]

See https://github.com/dart-lang/web-ui/issues/317

I'd love to bind HTML fields to Dart model objects that have been annotated with int and double.

Right now we have valueAsNumber which returns a variable annotated with num. Adding valueAsInt and valueAsDouble lets me use Web UI to bind to int's and double's.

Thanks!!

[jmesserly]

I wonder what the real thing is in browsers. Presumably it's a double. Maybe dart:html could do the conversion. Not sure how they've handled similar issues before, but presumably a lot of DOM numbers have this problem.

[sethladd]

One idea is for Web UI to provide conversion filters. One way or another, I'd love to bind to models that are annotated with int :)

[DartBot]

This comment was originally written by [email protected]

---

I would like this feature as well. Got to this issue from web-ui issue #317.

[jmesserly]

@seth, we'll definitely have filters in web_ui. But the int/double distinction seems useful to capture in our DOM-for-Dart, since not everyone will be using web_ui package.

[blois]

I worry about adding duplicate members which are backed by the same field, just for the purpose of coercion to the binding destination.

I think this is something which should be addressed further down in the binding system.

It would be nice if doubles or ints could automatically be coerced by the binding system.

[blois]

Added this to the Later milestone.

[kevmoo]

Removed Area-HTML label.
Added Area-Library, Library-Html labels.

[kasperl]

Removed this from the Later milestone.
Added Oldschool-Milestone-Later label.

[kasperl]

Removed Oldschool-Milestone-Later label.

[alan-knight]

I don't think Polymer suffers from this problem. It seems like the click counter example does exactly this.

---

Added AssumedStale label.