Populating a core-list throws an error if the tab is not in focus

[Viktor Kojouharov]

Hi,

I'm running into an error when my app loads, but the tab is not actually in focus. Core list throws this error:

 Uncaught TypeError: Cannot set property 'model' of undefined

And then this one, though it might be as a result of the previous one:

 Uncaught TypeError: Cannot read property '_translateY' of undefined

I sort of recall that polymer now doesn't do any worn when the tab is not in focus, so my question is, what's the proper way to make sure that populating the list won't throw errors?

[AJ Ortega]

Does your core-list have a scrollTarget set? If you're using core-pages for your tabs, you should set that as the core-list's scrolltarget.

Something like <core-list scrollTarget="{{$.idOfScrollTarget}}" should fix your issue.

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[Viktor Kojouharov]

It has a scrollTarget, though I'm setting it in the 'domReady' method of the component which holds the list:

https://github.com/urandom/readeef/blob/0393599c143f1bea8583fc9c8b44c16778a53bf1/static/js/rf-content-list.js#L88

and its set to the scaffolding's container for the main content. I didn't find a 'proper' way of setting it in the html itself, probably due to ignorance on my part.

[AJ Ortega]

Is this your list? https://github.com/urandom/readeef/blob/0393599c143f1bea8583fc9c8b44c16778a53bf1/templates/components/rf-content-list.tmpl#L24

If so, you should be able to add the attribute scrollTarget="{{$.pages}}" to the core-list defined there, and it *should* work.

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[Viktor Kojouharov]

Yes it is. Would the 'pages' as a target be correct though, as its not technically scrolling. The scaffolding container is the actual scrolling element. I fear setting it to 'pages' would effectively remove the lazy loading of the list, since it would think that there's nothing to scroll.