How to get list of registered custom elements

Question

I\'m trying to detect whether a custom element with a specific name was registered or not. Is there a way to make such check?

Or is there a way to get list of regist

Answer 1

While I am not sure it applies to other Web Component frameworks, while using Polymer in Chrome, I have a CustomElements object to the window object. The CustomElements object has a key/value collection of all registered custom elements called registry.

function isRegistered(name) {
    if (window.CustomElements && window.CustomElements.registry)
        return name in window.CustomElements.registry;
    return undefined;
}