Polymer databinding supports one-time binding. Unfortunatey, this isn't
documented yet (just opened this bug:
https://github.com/Polymer/docs/issues/282), but the basic behavior is:
-any place you would use a double-mustache {{ foo }} to create a dynamic
binding, you can use double brackets [[ foo ]] to create a one-time
binding. This will not incur the overhead of setting up an observer.
On Tue, Feb 25, 2014 at 11:07 AM, Just.A.Guy <[email protected]>wrote:
> I don't know how polymer does data binding.
> I suspect it is using some time of "onChange" listener.
>
> The more elements that there are to bind increases the overhead of
> supporting the two-way sync process.
>
> I am wondering if there is not some waste in all that monitoring. In my
> experience there are two types
> of data values.
>
> a. Constant - these are set at the time of the instance instantiation and
> do not change during the remaining time of execution.
> b. non-constant - these change when the end user interacts with the
> application.
>
> It seems that polymer only provides support for the type-b variables. Yet
> because of that, as the number of variables
> increases, performance can suffer. If there was a way to identify type-a
> (constants), and then only bind those values
> once (after ready?) without change monitoring, then the amount of
> monitoring for change may have a smaller impact.
>
> Or maybe there is a type-c variable which is only changed by some
> javascript in a callback routine. Then provide
> a function that re-values those changed variables. And have the callback
> script call it after it makes a change.
> That way the only monitored variables would be those that the end user can
> change.
>
>
> Follow Polymer on Google+: plus.google.com/107187849809354688692
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