This is probably a basic JS question but since I am using Polymer ...
I do have a development background but I am not a JS guru or even
intermediate. So ...

I am getting this warning in Chrome Dev tools " Attributes on [element
name] were data bound prior to Polymer upgrading the element. This may
result in incorrect binding types."
​On all of my polymer elements that were created with yo polymer:el
 ​[element name]

​Some of these, using core-list I have bound to static data for testing but
some of them ​are still just the skeleton as created with Yeoman.
I do notice that one of my core-list elements that has 12 items will
display 4 items when first selected (via a menu) and then after selecting
another menu option and going back to it it displays all 12.

I tried putting the 12 item list inside a ready function (from examples on
YouTube and the Polymer site) but that didn't change the behavior.


So what does the warnings mean and what should I do about it?

​Thanks,
Tim

​


============================================
Timothy Cook
LinkedIn Profile:http://www.linkedin.com/in/timothywaynecook
MLHIM http://www.mlhim.org

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