I'm curious how the browser knows what to render when it decides to "connect" your component. It seems like, from the naming, connectedCallback is called after the Dom expects something to exist, so there's a period of time while your function runs that there is nothing (not even a container) rendered? Or is that less a componentDidMount and more of a componentWillMount?
Also, is there any sort of poly fill or transplanting to get this in older browsers...or even just some automatic graceful degradation (like in your try..catch block).
Thanks again! This was very clear and straightforward intro!
Awesome! Polymer is the best way to create web components that are cross-browser compatible. The API is somewhat different, but they are much more usable!
connectedCallback is called when the custom element is first connected to the document's DOM (according to the MDN documentation). So the container mounts to the DOM, then connectedCallback is triggered.
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connectedCallback is called every time, when an element is attached to document, so also when you move an element from one parent to another. MDN definition:
connectedCallback: Invoked each time the custom element is appended into a document-connected element. This will happen each time the node is moved, and may happen before the element's contents have been fully parsed.
Thanks for the intro to Web Components!
I'm curious how the browser knows what to render when it decides to "connect" your component. It seems like, from the naming,
connectedCallback
is called after the Dom expects something to exist, so there's a period of time while your function runs that there is nothing (not even a container) rendered? Or is that less acomponentDidMount
and more of acomponentWillMount
?Also, is there any sort of poly fill or transplanting to get this in older browsers...or even just some automatic graceful degradation (like in your try..catch block).
Thanks again! This was very clear and straightforward intro!
Awesome! Polymer is the best way to create web components that are cross-browser compatible. The API is somewhat different, but they are much more usable!
connectedCallback
is called when the custom element is first connected to the document's DOM (according to the MDN documentation). So the container mounts to the DOM, thenconnectedCallback
is triggered.WebReflection on GitHub has a cross browser compatible polyfill of document.registerElement
connectedCallback
is called every time, when an element is attached to document, so also when you move an element from one parent to another. MDN definition:(developer.mozilla.org/en-US/docs/W...)