You can use observers for this:
https://www.polymer-project.org/1.0/docs/devguide/properties.html#multi-property-observers

On Thu, Jul 9, 2015 at 7:24 PM <[email protected]> wrote:

> Hello,
>
> What I want is for an iron-ajax to generate its request when a variable
> changes, but my credentials are variables that may be loaded out of order.
>
> Is there an easy polymer style way to wait for some variables being set
> before observer changes on others, or is this a more complicated futures or
> promises type situation?
>
> Follow Polymer on Google+: plus.google.com/107187849809354688692
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