The warning is sort of opaque, but it's meant to prevent you from attempting to data bind or interact with a custom element before it has been upgraded.
It's hard to say exactly what's going wrong without seeing a simplified example. You could try creating a project with just one element that illustrates the problem and upload it to github so we can take a look On Thu, Jan 1, 2015 at 6:21 AM, Timothy W. Cook <[email protected]> wrote: > 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 > > Follow Polymer on Google+: plus.google.com/107187849809354688692 > --- > You received this message because you are subscribed to the Google Groups > "Polymer" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/polymer-dev/CA%2B%3DOU3WxCTPJdFsyXOjThWfxPEWuSKKQx1o7dft_AupTexgjvQ%40mail.gmail.com > <https://groups.google.com/d/msgid/polymer-dev/CA%2B%3DOU3WxCTPJdFsyXOjThWfxPEWuSKKQx1o7dft_AupTexgjvQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > Follow Polymer on Google+: plus.google.com/107187849809354688692 --- You received this message because you are subscribed to the Google Groups "Polymer" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/polymer-dev/CAJj5OwBL4YrFRwcg9Q1Rd_z%2BQC8jojSRTmp%2Bwh-5XQGi%2BWtCAg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
