Re: [polymer-dev] Is it possible to have polymer-expressions controlled firing?

[Erik Arvidsson]

These should go away when we turn on Object.observer by default. Right now we are polling to see if the model changed.

On Wed, Feb 12, 2014 at 3:21 PM, Jono Brandel <jonob...@google.com> wrote:

I'm developing a mobile application and love using Polymer specifically for importing in custom elements. The application relies on a custom element that does canvas drawing on requestAnimationFrame. As a result I've been looking at Chrome's Timeline Console to see if I can shave off as many operations as possible to keep the application buttery smooth. During my analysis there are many things on my end I can optimize. But I also noticed a polymer based timed functions:

For lack of a better term I'm going to call this polling (I'd love to know at a high level what Polymer is doing here). Is it possible to stop this polling and fire this update myself? Since I'm only using the imports and custom elements, I wanted to test and see if I could get away with updating polymer only during the initialization of the page and sparingly during the drawing / requestAnimationFrame view.

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erik

[Jono Brandel]

Sorry yes, question can be seen here: http://stackoverflow.com/questions/21787784/is-it-possible-to-control-polymer-expressions-firing

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Jono Brandel |

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[Eric Bidelman]

Here's more info on how data change propagate in Polymer:

http://www.polymer-project.org/polymer.html#flush

On Fri, Feb 14, 2014 at 11:10 AM, Erik Arvidsson <a...@google.com> wrote:

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[John Messerly]

btw, if y'all wanted to get rid of the polling, something to look at is zone.js: https://github.com/angular/zone.js

It can be used to essentially trap any callbacks from the DOM, and do dirty-checking once at end-of-current-microtask. Pretty nifty.

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[Jono Brandel]

Thanks so much for all your help!

-Jono