on-* expression support

[bitpshr]

Is there a plan to add true expression support to on-* bindings rather than restricting them to simple path expressions?

e.g.

<message-entry
    on-tap="{{ {loadNextPage: message.type == 'pagination'} | tokenList }}"
    data="{{message}}">
</message-entry>

Will work up a PR if desired, just curious.

[sorvell]

There are no immediate plans to add this, but it certainly makes sense to pass data to event handlers something like this.

We'll definitely consider a PR. I should mention that we want to be careful about expanding the expression syntax since this can have wide support implications.

[rafaelw]

@bitpshr If you want to attempt this, I recommend writing a proposal for how it will work and intended implementation.

[sorvell]

@bitpshr Please re-open if you have more to contribute, thanks.

[zoechi]

I guess googlearchive/polymer-dev#90, Polymer/polymer-dev#19, googlearchive/polymer-dev#30 are similar or at least related