Ok, that issue just hit me again so here it is with the details:

https://github.com/Polymer/polymer/issues/3262


On Wednesday, December 30, 2015 at 5:31:51 AM UTC-6, David Waterman wrote:
>
> Did you file a bug?
>
> Thanks,
>
> Max.
>
> On Sun, 27 Dec 2015 at 21:33 Darin Hensley <[email protected] 
> <javascript:>> wrote:
>
>> Thanks, I originally did this but I realized using a promise is a bad 
>> fit. The reason being, the queries used are blocking since they are non 
>> I/O, which means sync. I am still implementing a function that is checking 
>> and redoing if so, but without a promise. 
>>
>> However, I feel that this might be a bug in polymer because when dom 
>> manipulation js script is placed last in chrome, then all elements are 
>> garuanteed to be ready. This is from documentation(in the 0.5 to 1.0 
>> migration docs). I will file a bug tonight. 
>>
>>
>>
>> On Sunday, December 27, 2015 at 9:27:48 PM UTC, David Waterman wrote:
>>
>>> I just thought that my approach to this issue would be to create a 
>>> promise for each event (each event handler resolves its promise), and then 
>>> do Promise.all(). If you do this, you can test for native support of web 
>>> components which means 'webcomponentsready' doesn't fire at all[0], and 
>>> resolve it immediately, and your code will still work when Polymer change 
>>> to using native web components...
>>>
>>> Max.
>>> [0] <
>>> https://www.polymer-project.org/1.0/docs/migration.html#polymer-ready>
>>>
>>> On Sun, 27 Dec 2015 at 03:44 Darin Hensley <[email protected]> wrote:
>>>
>> It's been working for many refreshes...but it just happened again... I 
>>>> got 'Uncaught TypeError: Cannot read property 'addEventListener' of 
>>>> undefined' for 'panel.addEventListener("content-scroll", moveTitle);'. 
>>>> This 
>>>> is in chrome where the initialize.js script is loaded last in the 
>>>> index.html.
>>>>
>>>> function makeGlobalElements() {
>>>>   //elements is not routing list, routing list is elementList
>>>>
>>>>   panel = Polymer.dom(document.rootElement).querySelector(
>>>> 'paper-header-panel[main]');
>>>>   rippleElement = Polymer.dom(document.rootElement).querySelector(
>>>> '#ripple-element');
>>>>   toolbar = Polymer.dom(document.rootElement).querySelector(
>>>> '#main-toolbar');
>>>>   headerName = Polymer.dom(document.rootElement).querySelector(
>>>> '#name-title');
>>>>   drawer = Polymer.dom(document.rootElement).querySelector(
>>>> 'paper-drawer-panel');
>>>>   mainPanelContent = Polymer.dom(document.rootElement).querySelector(
>>>> '#mainPanelContent');
>>>>
>>>> };
>>>>
>>>>
>>>> function attatchListeners() {
>>>>   panel.addEventListener("content-scroll", moveTitle);
>>>>
>>>>   ....
>>>>
>>>>      
>>>> function initializeYay() {
>>>>   makeGlobalElements();
>>>>   attatchListeners();
>>>>   setUpRoutes();
>>>>   removeSplash();
>>>>   //fetchPdfjs();
>>>> }
>>>>
>>>> if (!webComponentsSupported) {
>>>>   document.addEventListener('WebComponentsReady', initializeYay);
>>>> } else {
>>>>   initializeYay();
>>>>   page('/portfolio');
>>>> }
>>>>
>>>>
>>>>
>>>> ----
>>>>
>>>> On Friday, December 25, 2015 at 9:37:55 AM UTC-6, Eric Bidelman wrote:
>>>>
>>>>> You can attach listeners to elements before they're upgraded and 
>>>>> ready. That's a nice property of custom elements and DOM events. Waiting 
>>>>> to 
>>>>> attach until WCR means you may miss the event the first time it's fired.
>>>>>
>>>>> On Thu, Dec 24, 2015, 10:32 PM Darin Hensley <[email protected]> 
>>>>> wrote:
>>>>>
>>>> I am having  issues(not consistent....random) where the elements are 
>>>>>> not ready when I attach the listeners. I placed a setTimeout to try and 
>>>>>> compensate the random race condition. Should these elements be ready 
>>>>>> during 
>>>>>> the time of their queries when  WebComponentsReady fires or with the 
>>>>>> initialize.js script placed last at the bottom of the index.html?
>>>>>> function makeGlobalElements() {
>>>>>>   //elements is not routing list, routing list is elementList
>>>>>>   panel = document.querySelector('paper-header-panel[main]');
>>>>>>   rippleElement = document.getElementById('ripple-element');
>>>>>>   toolbar = document.querySelector('#main-toolbar');
>>>>>>   headerName = document.getElementById('name-title');
>>>>>>   drawer = document.querySelector('paper-drawer-panel');
>>>>>>   mainPanelContent = document.getElementById('mainPanelContent');
>>>>>> };
>>>>>>
>>>>>> function attatchListeners() {
>>>>>>   panel.addEventListener("content-scroll", moveTitle);
>>>>>>   ['webkitAnimationEnd', 'animationend']
>>>>>>   .forEach(function(vendor) {
>>>>>>     mainPanelContent.addEventListener(vendor, function 
>>>>>> (animationEvent) {
>>>>>>       if (animationEvent.animationName === "slide-down") {
>>>>>>         afterSlideDown.runStack();
>>>>>>         mainPanelContent.classList.remove('slide-down-now');
>>>>>>       }
>>>>>>     });
>>>>>>     headerName.addEventListener(vendor, function() { 
>>>>>>       headerName.classList.remove('fade-title'); 
>>>>>>     });
>>>>>>   });
>>>>>> };
>>>>>>
>>>>>>
>>>>>> function initializeYay() {
>>>>>>   makeGlobalElements();
>>>>>>   setTimeout(attatchListeners, 500);
>>>>>>     setUpRoutes();
>>>>>>   removeSplash();
>>>>>>   //fetchPdfjs();
>>>>>> }
>>>>>>
>>>>>> if (!webComponentsSupported) {
>>>>>>   document.addEventListener('WebComponentsReady', initializeYay);
>>>>>> } else {
>>>>>>   initializeYay();
>>>>>>   page('/portfolio');
>>>>>> }
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Tuesday, December 22, 2015 at 9:44:05 PM UTC-6, Darin Hensley 
>>>>>> wrote:
>>>>>>>
>>>>>>> stack overflow post 
>>>>>>> <http://stackoverflow.com/questions/34428255/domcontentloaded-never-fires-can-not-use-webcomponentsready>
>>>>>>>
>>>>>>>
>>>>>>> Using polymer 1.2.3,
>>>>>>>
>>>>>>>
>>>>>>> In linux firefox 42.0, where the polyfill(webcomponents-lite.js) is 
>>>>>>> used:
>>>>>>>
>>>>>>>
>>>>>>> `WebComponentsReady` fires to soon, because I `querySelect` and 
>>>>>>> `getElementById` elements that do not exist yet in `initialize`.
>>>>>>>
>>>>>>>
>>>>>>>     window.addEventListener('WebComponentsReady', function() {
>>>>>>>       initialize
>>>>>>>         .then(attatchListeners)
>>>>>>>
>>>>>>>
>>>>>>> So I am using `DOMContentLoaded` but it never fires:
>>>>>>>
>>>>>>>        document.addEventListener('DOMContentLoaded', function() {
>>>>>>>          initialize
>>>>>>>           .then(attatchListeners)
>>>>>>>      
>>>>>>>
>>>>>>>
>>>>>>> Any ideas on how to make initialize run when the elements are 
>>>>>>> available for `querySelect()`? 
>>>>>>>
>>>>>>> Follow Polymer on Google+: plus.google.com/107187849809354688692
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>>>>>
>>>>>
>>>>>> To view this discussion on the web visit 
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>>>>>>  
>>>>>> <https://groups.google.com/d/msgid/polymer-dev/13dcb312-f0a9-44d5-bf55-29be4cd38441%40googlegroups.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
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>>>>  
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>>>>
>>> Follow Polymer on Google+: plus.google.com/107187849809354688692
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>>
>

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