{"id":69766,"date":"2023-06-02T07:21:58","date_gmt":"2023-06-02T06:21:58","guid":{"rendered":"https:\/\/kinqsta.com\/it\/?p=69766&#038;post_type=knowledgebase&#038;preview_id=69766"},"modified":"2025-10-01T20:43:42","modified_gmt":"2025-10-01T19:43:42","slug":"react-hooks-must-be-called-in-a-react-function-component-or-a-custom-react-hook-function","status":"publish","type":"post","link":"https:\/\/kinqsta.com\/it\/blog\/react-hooks-must-be-called-in-a-react-function-component-or-a-custom-react-hook-function\/","title":{"rendered":"Come Risolvere l&#8217;Errore &#8220;React Hooks must be called in a React Function Component or a Custom React Hook Function&#8221;"},"content":{"rendered":"<p>Gli hook hanno rivoluzionato il modo di scrivere componenti funzionali in <a href=\"https:\/\/kinqsta.com\/it\/blog\/react-js\/\">React<\/a>, fornendo un modo conciso ed efficiente per gestire lo stato e gli effetti collaterali.<\/p>\n<p>Tuttavia, come ogni nuova funzionalit\u00e0, anche questa \u00e8 accompagnata da una serie di regole e linee guida. Un errore frequente in cui possono imbattersi <a href=\"https:\/\/kinqsta.com\/it\/blog\/tipi-di-developer\/\">sviluppatori e sviluppatrici<\/a> React \u00e8 l&#8217;errore &#8220;react hooks must be called in a react function component or a custom react hook function&#8221;.<\/p>\n<p>In questo articolo analizzeremo nel dettaglio questo errore, capiremo perch\u00e9 si verifica e descriveremo le best practice per risolverlo.<\/p>\n<div><\/div><kinsta-auto-toc heading=\"Table of Contents\" exclude=\"last\" list-style=\"arrow\" selector=\"h2\" count-number=\"-1\"><\/kinsta-auto-toc>\n<h2>Cosa causa l&#8217;errore &#8220;React Hooks Must Be Called In a React Function Component or a Custom React Hook Function&#8221;?<\/h2>\n<p>Per utilizzare gli hook di React vanno seguite delle regole. Durante la fase di apprendimento, molti sviluppatori React ignorano queste regole, il che porta inevitabilmente a compiere degli errori. Uno di questi errori \u00e8 &#8220;react hooks must be called in a react function component or a custom react hook function&#8221;.<\/p>\n<p>Questo errore si verifica quando si verificano due cose:<\/p>\n<ul>\n<li>Si utilizzano gli hook di React in componenti di classe<\/li>\n<li>Si invocano gli hook di React all&#8217;interno di una funzione annidata<\/li>\n<\/ul>\n<p>Gli hook di React, come <code>useState<\/code>, <code>useEffect<\/code>, e <code>useContext<\/code>, sono progettati per essere invocati al livello superiore di un componente funzionale o di una funzione hook personalizzata. Inoltre, dovrebbero essere invocati solo nei componenti funzionali e non in quelli di classe. Queste due regole garantiscono un uso corretto e coerente degli hook degli <a href=\"https:\/\/kinqsta.com\/it\/blog\/react-hook-useeffect-has-a-missing-dependency\/\">hook<\/a> nei componenti React.<\/p>\n<p>Quando gli hook vengono invocati in ambiti non corretti, si riceve questo errore: &#8220;react hooks must be called in a react function component or a custom react hook function&#8221;. Si tratta di un errore ESLint che permette di evitare che gli hook vengano utilizzati in modo da causare comportamenti inattesi e bug in un&#8217;<a href=\"https:\/\/kinqsta.com\/it\/blog\/clone-di-chatgpt\/\">applicazione React<\/a>.<\/p>\n\n<h2>2 soluzioni per risolvere l&#8217;errore &#8220;React Hooks Must Be Called In a React Function Component or a Custom React Hook Function&#8221;<\/h2>\n<p>Questo errore pu\u00f2 essere risolto in diversi modi, a seconda della situazione o dell&#8217;uso improprio che se ne \u00e8 fatto.<\/p>\n<h3>1. Non utilizzare mai gli hook di React nei componenti di classe<\/h3>\n<p>Gli hook sono progettati per funzionare solo con <a href=\"https:\/\/kinqsta.com\/it\/blog\/web-component\/\">componenti<\/a> funzionali o hook personalizzati, perch\u00e9 utilizzano lo stack di chiamate dei componenti funzionali per gestire lo stato e il ciclo di vita del componente. I componenti di classe non hanno questo stack di chiamate, quindi non \u00e8 possibile usare gli hook direttamente.<\/p>\n<pre><code class=\"language-jsx\">import React, { useState } from 'react';\nclass Counter extends React.Component {\n    state = { count: 0 };\n    render() {\n        const [count, setCount] = useState(0);\n        \/\/ Error: React Hooks must be called in a React function component or a custom React Hook function\n        return (\n            &lt;div&gt;\n                &lt;p&gt;You clicked {count} times&lt;\/p&gt;\n                &lt;button onClick={() =&gt; setCount(count + 1)}&gt;Click me&lt;\/button&gt;\n            &lt;\/div&gt;\n        );\n    }\n}\nexport default Counter;<\/code><\/pre>\n<p>Se lo fate, otterrete questo errore:<\/p>\n<figure style=\"width: 1600px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinqsta.com\/wp-content\/uploads\/2023\/04\/react-hook-error.jpg\" alt=\"Errore della funzione React\" width=\"1600\" height=\"125\"><figcaption class=\"wp-caption-text\">Errore<\/figcaption><\/figure>\n<p>Ma ci sono diversi modi per risolvere questo problema, a seconda delle proprie preferenze. Si pu\u00f2 decidere di utilizzare <code>state<\/code> e <code>setState<\/code> con i componenti di classe, convertire il componente in un componente funzionale o utilizzare un componente di ordine superiore (HOC).<\/p>\n<h4>A. Convertire il componente di classe in un componente funzionale<\/h4>\n<p>Gli hook possono funzionare solo in un componente funzionale. <\/p>\n<p>Nell&#8217;esempio che segue, il componente di classe precedente viene convertito in un componente funzionale:<\/p>\n<pre><code class=\"language-jsx\">import { useState } from 'react';\n\nfunction MyComponent(props) {\n  const [count, setCount] = useState(0);\n  return (\n    &lt;div&gt;\n      &lt;p&gt;Count: {count}&lt;\/p&gt;\n      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;Increment&lt;\/button&gt;\n    &lt;\/div&gt;\n  );\n}<\/code><\/pre>\n<h4>B. Utilizzare un componente di ordine superiore (HOC)<\/h4>\n<p>Per utilizzare gli hook in un componente di classe si pu\u00f2 utilizzare un componente di ordine superiore (HOC).<\/p>\n<p>Un componente di ordine superiore \u00e8 una funzione che prende un componente e restituisce un nuovo componente con oggetti o funzionalit\u00e0 aggiuntive. Ecco un esempio di HOC in cui si forniscono gli hook a un componente di classe:<\/p>\n<pre><code class=\"language-jsx\">import React, { useState } from 'react';\n\nfunction withHooks(WrappedComponent) {\n  return function(props) {\n    const [count, setCount] = useState(0);\n    return (\n      &lt; WrappedComponent count={count} setCount={setCount} {...props} \/&gt;\n    );\n  };\n}\n\nclass MyComponent extends React.Component {\n  render() {\n    const { count, setCount } = this.props;\n    return (\n      &lt; div&gt;\n        &lt; p&gt;Count: {count}&lt; \/p&gt;\n        &lt; button onClick={() =&gt; setCount(count + 1)}&gt;Increment&lt; \/button&gt;\n      &lt; \/div&gt;\n    );\n  }\n}\n\nexport default withHooks(MyComponent);<\/code><\/pre>\n<h4>C. Utilizzare gli Stati in un componente di classe<\/h4>\n<p>Infine, se non si vuole cambiare la sintassi del componente, si pu\u00f2 decidere di utilizzare <code>state<\/code> e <code>setState<\/code> al posto di useState:<\/p>\n<pre><code class=\"language-jsx\">import React from 'react';\n\nclass MyComponent extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = { count: 0 };\n  }\n\n  handleIncrement = () =&gt; {\n    this.setState({ count: this.state.count + 1 });\n  }\n\n  render() {\n    return (\n      &lt;div&gt;\n        &lt;p&gt;Count: {this.state.count}&lt;\/p&gt;\n        &lt;button onClick={this.handleIncrement}&gt;Increment&lt;\/button&gt;\n      &lt;\/div&gt;\n    );\n  }\n}\n\nexport default MyComponent;<\/code><\/pre>\n<h3>2. Non invocare mai gli hook di React all&#8217;interno di una funzione annidata<\/h3>\n<p>Una regola chiara degli hook di React \u00e8 che tutti gli hook devono essere invocati al livello superiore di un componente funzionale o di una funzione hook personalizzata. Invocando un hook all&#8217;interno di una funzione annidata, si viola la regola.<\/p>\n<p>Nell&#8217;esempio che segue, l&#8217;hook <code>useState<\/code> \u00e8 invocato dalla funzione <code>handleClick<\/code>:<\/p>\n<pre><code class=\"language-jsx\">import React, { useState } from 'react';\nfunction MyComponent() {\n    let count = 0;\n    function handleClick() {\n        const [count, setCount] = useState(0);\n        setCount(count + 1);\n    }\n    return (\n        &lt;div&gt;\n            &lt;p&gt;Count: {count}&lt;\/p&gt;\n            &lt;button onClick={handleClick}&gt;Increment&lt;\/button&gt;\n        &lt;\/div&gt;\n    );\n}\n\nexport default MyComponent;<\/code><\/pre>\n<p>In questo caso viene emesso il seguente errore:<\/p>\n<figure style=\"width: 1600px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinqsta.com\/wp-content\/uploads\/2023\/04\/react-hook-nested-function-error.jpg\" alt=\"Esempio di errore\" width=\"1600\" height=\"149\"><figcaption class=\"wp-caption-text\">Esempio di errore<\/figcaption><\/figure>\n<p>Il problema si risolve spostando l&#8217;hook al di fuori della funzione, al livello superiore del componente funzionale:<\/p>\n<pre><code class=\"language-jsx\">import React, { useState } from 'react';\n\nfunction MyComponent() {\n    const [count, setCount] = useState(0);\n\n    function handleClick() {\n        setCount(count + 1);\n    }\n\n    return (\n        &lt;div&gt;\n            &lt;p&gt;Count: {count}&lt;\/p&gt;\n            &lt;button onClick={handleClick}&gt;Increment&lt;\/button&gt;\n        &lt;\/div&gt;\n    );\n}\n\nexport default MyComponent;<\/code><\/pre>\n\n<h2>Riepilogo<\/h2>\n<p>In questo articolo abbiamo appreso quali sono le cause dell&#8217;errore &#8220;react hooks must be called in a react function component or a custom react hook function&#8221; e come risolverlo.<\/p>\n<p>Seguite sempre le regole degli hook di React quando li utilizzate nei vostri progetti React per evitare di incorrere in errori come questo.<\/p>\n<p>State cercando la soluzione di hosting ideale per le vostre applicazioni React? Provate <a href=\"https:\/\/sevalla.com\/application-hosting\/\">gratuitamente<\/a> l&#8217;Hosting di applicazioni di Kinsta!<\/p>\n<p><em>Vogliamo sentire il vostro parere! Avete gi\u00e0 riscontrato questo errore? Come l&#8217;avete risolto? Avete seguito altri approcci che non sono stati trattati in questo articolo? Scrivete un commento nella sezione qui sotto!<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gli hook hanno rivoluzionato il modo di scrivere componenti funzionali in React, fornendo un modo conciso ed efficiente per gestire lo stato e gli effetti collaterali. &#8230;<\/p>\n","protected":false},"author":287,"featured_media":69767,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[26229,26212],"class_list":["post-69766","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-errori-di-react","topic-react"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.6 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Come Risolvere l&#039;Errore \u201cReact Hooks Must Be Called In a React Function Component or a Custom React Hook Function\u201d - 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