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Migrate div ref section to article

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Corbin Crutchley
2020-10-16 07:34:32 -07:00
parent e1699cc942
commit adc5e03e94
1 changed files with 12 additions and 10 deletions
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content/blog/react-refs-complete-story/index.md
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@@ -196,8 +196,7 @@ Because `useRef` relies on passing by reference and mutating that reference, if
# DOM Element References {#dom-ref} # DOM Element References {#dom-ref}
- Stored using "ref" attribute At the start of this article, I mentioned that `ref`s are not just a mutable data storage method, but a way to reference DOM nodes from inside of React. The easiest of the methods to track a DOM node is by storing it in a `useRef` hook using any element's `ref` property:
- HTMLDivElement stored in "current"
```jsx ```jsx
const elRef = React.useRef(); const elRef = React.useRef();
@@ -211,10 +210,13 @@ Because `useRef` relies on passing by reference and mutating that reference, if
) )
``` ```
https://stackblitz.com/edit/react-use-ref-effect > Keep in mind, the `ref` attribute is added and handled by React on any HTML Element. This example uses a `div`, but this applies to `span`s and `header`s and beyond, "oh my".
- Full "Element.prototype" JS API available In this example, if we took a look at the `console.log` in the `useEffect`, we'd find [an `HTMLDivElement` instance](https://developer.mozilla.org/en-US/docs/Web/API/HTMLDivElement) in the `current` property. Open the following StackBlitz and look at the console value to confirm:
- Can be used to style the element
<iframe src="https://stackblitz.com/edit/react-use-ref-effect?ctl=1&embed=1" style="width:100%; height:500px; border:0; border-radius: 4px; overflow:hidden;" sandbox="allow-modals allow-forms allow-popups allow-scripts allow-same-origin"></iframe>
Because `elRef.current` is now a `HTMLDivElement`, it means we now have access to [the entire `Element.prototype` JavaScript API](https://developer.mozilla.org/en-US/docs/Web/API/Element#Properties). As such, this `elRef` can be used to style the underlying HTML node:
```jsx ```jsx
const elRef = React.useRef(); const elRef = React.useRef();
@@ -228,9 +230,11 @@ https://stackblitz.com/edit/react-use-ref-effect
) )
``` ```
https://stackblitz.com/edit/react-use-ref-effect-style <iframe src="https://stackblitz.com/edit/react-use-ref-effect-style?ctl=1&embed=1" style="width:100%; height:500px; border:0; border-radius: 4px; overflow:hidden;" sandbox="allow-modals allow-forms allow-popups allow-scripts allow-same-origin"></iframe>
Ref attribute accepts functional API ## Alternative Syntax {#ref-function}
It's worth noting that the `ref` attribute also accepts a function. While [we'll touch on the implications of this more in the future](#callback-refs), just note that this code example does exaclty the same thing as `ref={elRef}`:
```jsx ```jsx
const elRef = React.useRef(); const elRef = React.useRef();
@@ -244,9 +248,7 @@ Ref attribute accepts functional API
) )
``` ```
https://stackblitz.com/edit/react-use-ref-effect-style-callback # Component References {#forward-ref}
# Component References {#forward-ref}
- Can pass "ref" to components - Can pass "ref" to components
- Property must not be called "ref"* - Property must not be called "ref"*