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Translate createRef (#687)
* Translate createRef --------- Co-authored-by: Mateo Guzmán <20783123+mateoguzmana@users.noreply.github.com>
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src/content/reference/react/createRef.md

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<Pitfall>
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`createRef` is mostly used for [class components.](/reference/react/Component) Function components typically rely on [`useRef`](/reference/react/useRef) instead.
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`createRef` se usa principalmente para [componentes de clase.](/reference/react/Component) Los componentes de función generalmente usan [`useRef`](/reference/react/useRef) en su lugar.
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</Pitfall>
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<Intro>
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`createRef` creates a [ref](/learn/referencing-values-with-refs) object which can contain arbitrary value.
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`createRef` crea un objeto [ref](/learn/referencing-values-with-refs) que puede contener un valor arbitrario.
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```js
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class MyInput extends Component {
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---
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## Reference {/*reference*/}
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## Referencia {/*reference*/}
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### `createRef()` {/*createref*/}
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Call `createRef` to declare a [ref](/learn/referencing-values-with-refs) inside a [class component.](/reference/react/Component)
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Invoca a `createRef` para declarar una [ref](/learn/referencing-values-with-refs) dentro de un [componente de clase.](/reference/react/Component)
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```js
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import { createRef, Component } from 'react';
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// ...
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```
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[See more examples below.](#usage)
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[Ver más ejemplos a continuación.](#usage)
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#### Parameters {/*parameters*/}
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#### Parámetros {/*parameters*/}
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`createRef` takes no parameters.
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`createRef` no recibe parámetros.
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#### Returns {/*returns*/}
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#### Retorna {/*returns*/}
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`createRef` returns an object with a single property:
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`createRef` retorna un objeto con una única propiedad:
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* `current`: Initially, it's set to the `null`. You can later set it to something else. If you pass the ref object to React as a `ref` attribute to a JSX node, React will set its `current` property.
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* `current`: Inicialmente, se inicializa en `null`. Posteriormente, se puede asignar a cualquier otra cosa. Si pasas el objeto ref a React como un atributo `ref` de un nodo JSX, React asignará su propiedad `current`.
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#### Caveats {/*caveats*/}
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#### Advertencias {/*caveats*/}
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* `createRef` always returns a *different* object. It's equivalent to writing `{ current: null }` yourself.
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* In a function component, you probably want [`useRef`](/reference/react/useRef) instead which always returns the same object.
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* `const ref = useRef()` is equivalent to `const [ref, _] = useState(() => createRef(null))`.
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* `createRef` siempre devuelve un objeto *diferente*. Es equivalente a escribir `{ current: null }` manualmente.
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* En un componente de función, probablemente querrás usar [`useRef`](/reference/react/useRef) en su lugar, que siempre devuelve el mismo objeto.
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* `const ref = useRef()` es equivalente a `const [ref, _] = useState(() => createRef(null))`.
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---
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## Usage {/*usage*/}
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## Uso {/*usage*/}
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### Declaring a ref in a class component {/*declaring-a-ref-in-a-class-component*/}
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### Declarar una referencia en un componente de clase {/*declaring-a-ref-in-a-class-component*/}
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To declare a ref inside a [class component,](/reference/react/Component) call `createRef` and assign its result to a class field:
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Para declarar una referencia ref dentro de un [componente de clase](/reference/react/Component), invoca a `createRef` y asigna el resultado a un campo de clase:
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```js {4}
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import { Component, createRef } from 'react';
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}
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```
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If you now pass `ref={this.inputRef}` to an `<input>` in your JSX, React will populate `this.inputRef.current` with the input DOM node. For example, here is how you make a button that focuses the input:
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Si ahora pasas `ref={this.inputRef}` a un `<input>` en tu JSX, React llenará `this.inputRef.current` con el nodo del DOM del input. Por ejemplo, así es como puedes crear un botón que enfoca el input:
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<Sandpack>
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<>
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<input ref={this.inputRef} />
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<button onClick={this.handleClick}>
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Focus the input
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Enfoca el input
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</button>
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</>
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);
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<Pitfall>
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`createRef` is mostly used for [class components.](/reference/react/Component) Function components typically rely on [`useRef`](/reference/react/useRef) instead.
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`createRef` se usa principalmente para [componentes de clase](/reference/react/Component). Los componentes de función generalmente dependen de [`useRef`](/reference/react/useRef) en su lugar.
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</Pitfall>
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---
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## Alternatives {/*alternatives*/}
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## Alternativas {/*alternatives*/}
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### Migrating from a class with `createRef` to a function with `useRef` {/*migrating-from-a-class-with-createref-to-a-function-with-useref*/}
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### Migrando de una clase con `createRef` a una función con `useRef` {/*migrating-from-a-class-with-createref-to-a-function-with-useref*/}
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We recommend using function components instead of [class components](/reference/react/Component) in new code. If you have some existing class components using `createRef`, here is how you can convert them. This is the original code:
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Recomendamos utilizar componentes de función en lugar de [componentes de clase](/reference/react/Component) en código nuevo. Si tienes componentes de clase existentes que utilizan `createRef`, así es cómo puedes convertirlos. Este es el código original:
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<Sandpack>
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<>
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<input ref={this.inputRef} />
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<button onClick={this.handleClick}>
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Focus the input
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Enfoca el input
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</button>
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</>
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);
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</Sandpack>
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When you [convert this component from a class to a function,](/reference/react/Component#alternatives) replace calls to `createRef` with calls to [`useRef`:](/reference/react/useRef)
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Cuando [convierta este componente de clase a función,](/reference/react/Component#alternatives) reemplace las invocaciones de `createRef` con [`useRef`:](/reference/react/useRef)
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<Sandpack>
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<>
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<input ref={inputRef} />
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<button onClick={handleClick}>
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Focus the input
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Enfoca el input
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</button>
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</>
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);

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