So the thing about refs is that they aren't guaranteed to be set on first render. You can be sure they are set during and after ... ... <看更多>

How react refs are set. To get the basics out of the way, ref is set to the DOM node when it's mounted, and set to null when the DOM node is ... ... <看更多>

Do you want to request a feature or report a bug? Possible bug What is the current behavior? ref callbacks are always passed null once ... ... <看更多>

Do you want to request a feature or report a bug? Possible bug What is the current behavior? ref callbacks are always passed null once ... ... <看更多>

We'll go over the 3 ways to create refs in React: string refs (don't use!), callback refs, and the new React ... ... <看更多>