Node Refs
The ref attribute can be used to attach the NodeRef to an HTML element. In callbacks,
you can then get the DOM Element that the ref is attached to. This can be used to make
changes to the DOM outside of the view lifecycle method, retrieve the value of an <input>
and other direct interactions with the DOM via the javascript API.
This is useful for getting ahold of canvas elements, or scrolling to different sections of a page.
警告
Do not manually modify the DOM tree that is rendered by Yew. Treat the NodeRef as a read-only
access, if you are unsure.