Creating Custom/nested element-registries

[alessandro meyer]

Hello There

I've been trying to found out whether it is possible to create nested registries either through polymer or native web components. But the W3C Spec is not really explicit enough for me about it.

http://w3c.github.io/webcomponents/spec/custom/#creating-and-passing-registries 

Says:

When creating a template contents owner document, use a new empty registry.

How would I do that? My goal is to have scoped imports so elements never clash in the global scope. If there are other approaches to it I'm happy to give them a try.

Thanks!

Alessandro

[Daniel Freedman]

As far as I know, there is nothing in the spec as of yet to allow for user defined registries. I believe this is planned for a later iteration of the spec.

Spec bug about this topic: https://www.w3.org/Bugs/Public/show_bug.cgi?id=24578

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[alessandro meyer]

Thank you for your answer.

Is there a JS-based temporal solution (hack) to this?

[Dominic Cooney]

This is kind of a hack, but you can create a new registry by creating an IFRAME and registering elements through its document, for example:

<iframe id="registry2" src="javascript:"></iframe>

var iframe = document.querySelector('#registry2');

iframe.contentDocument.registerElement(...);

etc.

There are other ways, but they all depend on this one weird trick of creating a second, unrelated document and using its registry. Having the iframe is convenient (although heavier) because you can also run scripts in there, and the scripts get an isolated global object.

HTH,

Dominic

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[Rob Dodson]

that's an interesting trick, thanks for sharing it Dominic :)

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