Неуправляемый элемент <textarea>

Введение

В этом практическом занятии мы узнаем, как создавать элемент <textarea>, не контролируемый в React. Целью этого практического занятия является демонстрация использования свойств defaultValue и onChange для передачи значения текстового поля в функцию обратного вызова в родительском компоненте. В конце этого практического занятия у вас будет лучше понимание того, как создавать неконтролируемые поля ввода в React.

Неуправляемый элемент </h2> <blockquote data-line="2"> <p>В ВМ уже предоставлены <code>index.html</code> и <code>script.js</code>. В общем, вам нужно только добавить код в <code>script.js</code> и <code>style.css</code>.</p> </blockquote> <p data-line="4">Эта функция отображает элемент <code><textarea></code>, который не контролируется родительским компонентом. Она использует функцию обратного вызова для передачи значения ввода в родительский компонент.</p> <p data-line="6">Для использования этой функции:</p> <ul data-line="8"> <li>Передайте свойство <code>defaultValue</code> из родительского компонента в качестве начального значения поля ввода.</li> <li>Используйте событие <code>onChange</code> для вызова обратного вызова <code>onValueChange</code> и отправки нового значения в родительский компонент.</li> </ul> <pre data-line="11"><code class="language-jsx" language=jsx><span class="code-block">const TextArea = ({ cols = 20, rows = 2, defaultValue, onValueChange, ...rest }) => { return ( <textarea cols={cols} rows={rows} defaultValue={defaultValue} onChange={({ target: { value } }) => onValueChange(value)} {...rest} /> ); };</span></code></pre> <p data-line="31">Пример использования:</p> <pre data-line="33"><code class="language-jsx" language=jsx><span class="code-block">ReactDOM.createRoot(document.getElementById("root")).render( <TextArea placeholder="Insert some text here..." onValueChange={(val) => console.log(val)} /> );</span></code></pre> <p data-line="42">Пожалуйста, нажмите кнопку "Go Live" в нижнем правом углу, чтобы запустить веб-сервис на порту 8080. Затем вы можете обновить вкладку <strong>Web 8080</strong>, чтобы просмотреть веб-страницу.</p> </article></div><!----><!--]--></div><!----><!--]--><!--[--><div class="pt-24 -mt-20 relative -z-10 anchor-item" id="%D1%80%D0%B5%D0%B7%D1%8E%D0%BC%D0%B5" data-v-21a317ea></div><div id="md-position-2" class="md-editor md-editor-previewOnly" style="background-color:transparent;" data-v-21a317ea><!--[--><div id="md-position-2-preview-wrapper" class="md-editor-preview-wrapper"><article id="md-position-2-preview" class="md-editor-preview default-theme"><h2 data-line="0" id="Резюме">Резюме</h2> <p data-line="2">Поздравляем! Вы завершили практическое занятие по неуправляемым элементам <code><textarea></code>. Вы можете выполнить больше практических занятий в LabEx, чтобы улучшить свои навыки.</p> </article></div><!----><!--]--></div><!----><!--]--><!--]--></div><span></span></div><div class="w-40 hidden lg:block shrink-0 sticky top-24"><div id="tutorial-detail-sidebar"><div class="mb-10"><!--[--><p class="text-xs font-bold uppercase mt-10">Поделиться</p><div class="flex gap-2 mt-5"><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-sm gap-x-1.5 p-1.5 shadow-sm dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300" aria-label="Поделиться в Twitter" href="https://twitter.com/intent/tweet?text=%D0%9D%D0%B5%D1%83%D0%BF%D1%80%D0%B0%D0%B2%D0%BB%D1%8F%D0%B5%D0%BC%D1%8B%D0%B9%20%D1%8D%D0%BB%D0%B5%D0%BC%D0%B5%D0%BD%D1%82%20%3Ctextarea%3E%20%D0%B2%20React%20%7C%20LabEx&url=https://labex.io/ru/tutorials/uncontrolled-textarea-element-38365" rel="noopener noreferrer" target="_blank"><!--[--><!--[--><!----><!--]--><!--[--><svg class="svg-icon" aria-hidden="true"><use href="/_nuxt/icons._COhqm4p.svg#twitter" fill="#333"></use></svg><!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-sm gap-x-1.5 p-1.5 shadow-sm dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300" aria-label="Поделиться в Facebook" href="https://www.facebook.com/sharer.php?title=%D0%9D%D0%B5%D1%83%D0%BF%D1%80%D0%B0%D0%B2%D0%BB%D1%8F%D0%B5%D0%BC%D1%8B%D0%B9%20%D1%8D%D0%BB%D0%B5%D0%BC%D0%B5%D0%BD%D1%82%20%3Ctextarea%3E%20%D0%B2%20React%20%7C%20LabEx&u=https://labex.io/ru/tutorials/uncontrolled-textarea-element-38365" rel="noopener noreferrer" target="_blank"><!--[--><!--[--><!----><!--]--><!--[--><svg class="svg-icon" aria-hidden="true"><use href="/_nuxt/icons._COhqm4p.svg#facebook" fill="#333"></use></svg><!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-sm gap-x-1.5 p-1.5 shadow-sm dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300" aria-label="Поделиться в Google Classroom" href="https://classroom.google.com/share?url=https://labex.io/ru/tutorials/uncontrolled-textarea-element-38365" rel="noopener noreferrer" target="_blank"><!--[--><!--[--><!----><!--]--><!--[--><svg class="svg-icon" aria-hidden="true"><use href="/_nuxt/icons._COhqm4p.svg#google-classroom-black" fill="#333"></use></svg><!--]--><!--[--><!----><!--]--><!--]--></a><!--]--></div><!--]--></div><p class="text-xs font-bold uppercase">Темы</p><div class="flex flex-wrap gap-1 mt-5"><!--[--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/linux"><!--[--><!--[--><!----><!--]--><!--[-->Linux<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/devops"><!--[--><!--[--><!----><!--]--><!--[-->DevOps<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/cybersecurity"><!--[--><!--[--><!----><!--]--><!--[-->Кибербезопасность<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/kali"><!--[--><!--[--><!----><!--]--><!--[-->Kali Linux<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/devops-engineer"><!--[--><!--[--><!----><!--]--><!--[-->DevOps Engineer<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/cybersecurity-engineer"><!--[--><!--[--><!----><!--]--><!--[-->Cybersecurity Engineer<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/database"><!--[--><!--[--><!----><!--]--><!--[-->База данных<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/datascience"><!--[--><!--[--><!----><!--]--><!--[-->Наука о данных<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/rhel"><!--[--><!--[--><!----><!--]--><!--[-->Red Hat Enterprise Linux<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/comptia"><!--[--><!--[--><!----><!--]--><!--[-->CompTIA<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/docker"><!--[--><!--[--><!----><!--]--><!--[-->Docker<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/kubernetes"><!--[--><!--[--><!----><!--]--><!--[-->Kubernetes<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/python"><!--[--><!--[--><!----><!--]--><!--[-->Python<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/git"><!--[--><!--[--><!----><!--]--><!--[-->Git<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/shell"><!--[--><!--[--><!----><!--]--><!--[-->Shell<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/nmap"><!--[--><!--[--><!----><!--]--><!--[-->Nmap<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/wireshark"><!--[--><!--[--><!----><!--]--><!--[-->Wireshark<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/hydra"><!--[--><!--[--><!----><!--]--><!--[-->Hydra<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/java"><!--[--><!--[--><!----><!--]--><!--[-->Java<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/sqlite"><!--[--><!--[--><!----><!--]--><!--[-->SQLite<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/postgresql"><!--[--><!--[--><!----><!--]--><!--[-->PostgreSQL<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/mysql"><!--[--><!--[--><!----><!--]--><!--[-->MySQL<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/redis"><!--[--><!--[--><!----><!--]--><!--[-->Redis<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" href="/ru/tutorials/category/mongodb"><!--[--><!--[--><!----><!--]--><!--[-->MongoDB<!--]--><!--[--><!----><!--]--><!--]--></a><!--]--><!--[--><a class="focus:outline-none disabled:cursor-not-allowed disabled:opacity-75 flex-shrink-0 font-medium rounded-md text-xs gap-x-1.5 px-2.5 py-1.5 dark:text-gray-900 disabled:bg-primary-500 dark:bg-primary-400 dark:hover:bg-primary-500 dark:disabled:bg-primary-400 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-primary-500 dark:focus-visible:outline-primary-400 inline-flex items-center text-gray-800 bg-gray-200 hover:bg-gray-300 shadow-none" 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text-gray-400 line-clamp-5">Nmap Онлайн</a></div><div class="flex flex-col gap-2"><a href="https://labex.io/ru/tutorials/wireshark-online-wireshark-playground-593624" rel="noopener noreferrer" class="hover:text-white text-gray-400 line-clamp-5">Wireshark Онлайн</a></div><div class="flex flex-col gap-2"><a href="https://labex.io/ru/tutorials/mysql-online-mysql-playground-372916" rel="noopener noreferrer" class="hover:text-white text-gray-400 line-clamp-5">MySQL Онлайн</a></div><div class="flex flex-col gap-2"><a href="https://labex.io/ru/tutorials/kali-online-postgresql-database-playground-593616" rel="noopener noreferrer" class="hover:text-white text-gray-400 line-clamp-5">PostgreSQL Онлайн</a></div><div class="flex flex-col gap-2"><a href="https://labex.io/ru/tutorials/rhel-online-rhel-terminal-rhcsa-and-rhce-exam-playground-592933" rel="noopener noreferrer" class="hover:text-white text-gray-400 line-clamp-5">Симулятор экзамена RHCSA</a></div><div class="flex flex-col gap-2"><a 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Linux","https://labex.io/ru/tutorials/category/linux",{"name":174,"url":175},"Учебник по Docker","https://labex.io/ru/tutorials/category/docker",{"name":177,"url":178},"Учебник по Kubernetes","https://labex.io/ru/tutorials/category/kubernetes",{"name":180,"url":181},"Учебник по MongoDB","https://labex.io/ru/tutorials/category/mongodb",{"name":183,"url":184},"Учебник по PostgreSQL","https://labex.io/ru/tutorials/category/postgresql",{"name":186,"url":187},"Учебник по Wireshark","https://labex.io/ru/tutorials/category/wireshark",{"name":189,"url":190},"Учебник по DevOps","https://labex.io/ru/tutorials/category/devops",{"name":192,"url":193},"Учебник по кибербезопасности","https://labex.io/ru/tutorials/category/cybersecurity",{"name":195,"url":196},"Вопросы для собеседования по Java","https://labex.io/ru/tutorials/java-java-interview-questions-and-answers-593685",{"name":198,"url":199},"Вопросы для собеседования по Python","https://labex.io/ru/tutorials/python-python-interview-questions-and-answers-593698",{"name":201,"url":202},"Вопросы для собеседования по Kubernetes","https://labex.io/ru/tutorials/kubernetes-kubernetes-interview-questions-and-answers-593688",{"name":204,"url":205},"Вопросы для собеседования по DevOps","https://labex.io/ru/tutorials/linux-devops-interview-questions-and-answers-593679",{"name":207,"url":208},"Вопросы для собеседования по кибербезопасности","https://labex.io/ru/tutorials/cybersecurity-cybersecurity-interview-questions-and-answers-593676",{"name":210,"url":211},"Вопросы для собеседования по Docker","https://labex.io/ru/tutorials/docker-docker-interview-questions-and-answers-593680",{"name":213,"url":214},"Вопросы для собеседования по Linux","https://labex.io/ru/tutorials/linux-linux-interview-questions-and-answers-593689",{"name":216,"url":217},"Вопросы для собеседования по MongoDB","https://labex.io/ru/tutorials/mongodb-mongodb-interview-questions-and-answers-593692",{"name":219,"url":220},"Вопросы для собеседования по базам данных","https://labex.io/ru/tutorials/linux-database-interview-questions-and-answers-593677",{"tutorial":222,"steps":252,"skilltrees":265},{"id":223,"name":224,"fee_type":225,"type":225,"difficulty":226,"time":227,"from_community":228,"max_lab_num":229,"allow_to_start":230,"remain_num":225,"allow_to_view":230,"skills":231,"hidden":230,"path":232,"alias":233,"icon":234,"show_in_tutorial":228,"description":235,"default_console_type":236,"open_source_url":237,"meta_title":238,"meta_description":239,"meta_keywords":240,"skilltree_alias":241,"practice_url":241,"langs":242,"ai_verify":230},38365,"Неуправляемый элемент \u003Ctextarea>",0,"Beginner",5,true,-1,false,[],"react/30-seconds-of-react/lab-text-area","uncontrolled-textarea-element-38365","https://icons.labex.io/uncontrolled-textarea-element.png","В этом практическом занятии мы узнаем, как создавать элемент \u003Ctextarea>, не контролируемый в React. Целью этого практического занятия является демонстрация использования свойств defaultValue и onChange для передачи значения текстового поля в функцию обратного вызова в родительском компоненте. В конце этого практического занятия у вас будет лучше понимание того, как создавать неконтролируемые поля ввода в React.",4,"https://github.com/labex-labs/open-source-labs/tree/master/react/30-seconds-of-react/lab-text-area","Неуправляемый элемент \u003Ctextarea> в React","Изучите, как создать неуправляемый элемент textarea в React, используя свойства defaultValue и onChange для передачи значения в функцию обратного вызова.","react, неконтролируемый ввод, defaultValue, onChange, textarea","",[243,244,245,246,247,248,249,250,251],"zh","es","fr","de","ja","ru","ko","pt","en",[253,257,261],{"position":225,"title":254,"layout":255,"text":256,"need_verify":230,"has_solution":230},"Введение","doc-fullscreen","## Введение\n\nВ этом практическом занятии мы узнаем, как создавать элемент `\u003Ctextarea>`, не контролируемый в React. Целью этого практического занятия является демонстрация использования свойств `defaultValue` и `onChange` для передачи значения текстового поля в функцию обратного вызова в родительском компоненте. В конце этого практического занятия у вас будет лучше понимание того, как создавать неконтролируемые поля ввода в React.\n\n\u003Cdiv class=\"text-xs text-gray-500 dark:text-gray-400 mt-4 border-t border-l-2 border-gray-300 dark:border-gray-600 pt-2 pl-4\">\nЭто Guided Lab, который предоставляет пошаговые инструкции, чтобы помочь вам учиться и практиковаться. Внимательно следуйте инструкциям, чтобы выполнить каждый шаг и получить практический опыт. Исторические данные показывают, что это лабораторная работа уровня \u003Cspan class=\"text-green-600 dark:text-green-400\">начальный\u003C/span> с процентом завершения \u003Cspan class=\"text-green-600 dark:text-green-400\">100%\u003C/span>. Он получил \u003Cspan class=\"text-primary-600 dark:text-primary-400\">100%\u003C/span> положительных отзывов от учащихся.\n\u003C/div>\n",{"position":258,"title":224,"layout":259,"text":260,"need_verify":228,"has_solution":230},1,"doc-workbench-split","## Неуправляемый элемент \u003Ctextarea>\n\n> В ВМ уже предоставлены `index.html` и `script.js`. В общем, вам нужно только добавить код в `script.js` и `style.css`.\n\nЭта функция отображает элемент `\u003Ctextarea>`, который не контролируется родительским компонентом. Она использует функцию обратного вызова для передачи значения ввода в родительский компонент.\n\nДля использования этой функции:\n\n- Передайте свойство `defaultValue` из родительского компонента в качестве начального значения поля ввода.\n- Используйте событие `onChange` для вызова обратного вызова `onValueChange` и отправки нового значения в родительский компонент.\n\n```jsx\nconst TextArea = ({\n cols = 20,\n rows = 2,\n defaultValue,\n onValueChange,\n ...rest\n}) => {\n return (\n \u003Ctextarea\n cols={cols}\n rows={rows}\n defaultValue={defaultValue}\n onChange={({ target: { value } }) => onValueChange(value)}\n {...rest}\n />\n );\n};\n```\n\nПример использования:\n\n```jsx\nReactDOM.createRoot(document.getElementById(\"root\")).render(\n \u003CTextArea\n placeholder=\"Insert some text here...\"\n onValueChange={(val) => console.log(val)}\n />\n);\n```\n\nПожалуйста, нажмите кнопку \"Go Live\" в нижнем правом углу, чтобы запустить веб-сервис на порту 8080. Затем вы можете обновить вкладку **Web 8080**, чтобы просмотреть веб-страницу.\n",{"position":262,"title":263,"layout":255,"text":264,"need_verify":230,"has_solution":230},2,"Резюме","## Резюме\n\nПоздравляем! Вы завершили практическое занятие по неуправляемым элементам `\u003Ctextarea>`. Вы можете выполнить больше практических занятий в LabEx, чтобы улучшить свои навыки.\n",[],{"paths":267},[268,271,274,277,280,283,286,289,292,295,298,301,304,307,310,313,316,319,322,325,328,331,334,337,340,343,346,349,352,355,358,361,364,367,370,373,376,379],{"alias":269,"name":270},"linux","Linux",{"alias":272,"name":273},"devops","DevOps",{"alias":275,"name":276},"cybersecurity","Кибербезопасность",{"alias":278,"name":279},"kali","Kali Linux",{"alias":281,"name":282},"devops-engineer","DevOps Engineer",{"alias":284,"name":285},"cybersecurity-engineer","Cybersecurity Engineer",{"alias":287,"name":288},"database","База данных",{"alias":290,"name":291},"datascience","Наука о данных",{"alias":293,"name":294},"rhel","Red Hat Enterprise 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up mit LabEx Pro","Level Up With LabEx Pro","Sube de nivel con LabEx Pro","Montez de niveau avec LabEx Pro","LabEx Pro にレベルアップ","LabEx Pro로 레벨업","Suba de nível com LabEx Pro","Повысьте уровень с LabEx Pro","升级到 LabEx Pro","link","/pricing",{"de":411,"en":412,"es":413,"fr":414,"ja":415,"ko":416,"pt":417,"ru":418,"zh":419},"🚀 Seit 2017 · Vertraut von 900K+ Lernenden · 100% Praxisorientiert","🚀 Since 2017 · Trusted by 900K+ Learners · 100% Hands-On","🚀 Desde 2017 · Confiado por 900K+ Estudiantes · 100% Práctico","🚀 Depuis 2017 · Fait confiance par 900K+ Apprenants · 100% Pratique","🚀 2017年以来 · 90万人以上の学習者に信頼 · 100% ハンズオン","🚀 2017년부터 · 90만명+ 학습자가 신뢰 · 100% 실습","🚀 Desde 2017 · Confiado por 900K+ Aprendizes · 100% Prático","🚀 С 2017 года · Доверие 900К+ учащихся · 100% Практика","🚀 自2017年 · 90万+学习者信赖 · 100% 动手实践",{"de":421,"en":422,"es":423,"fr":424,"ja":425,"ko":426,"pt":427,"ru":428,"zh":429},"Kostenloser Plan auf 3 VM-Starts pro Tag begrenzt","Free Plan Limited to 3 VM Launches Per Day","Plan gratuito limitado a 3 lanzamientos de VM por día","Plan gratuit limité à 3 lancements de VM par jour","無料プランは1日3回のVM起動に制限されています","무료 플랜은 하루 3회 VM 실행으로 제한됩니다","Plano gratuito limitado a 3 inicializações de VM por dia","Бесплатный план ограничен 3 запусками ВМ в день","免费计划每天限制启动3个虚拟机",{"key":431,"text":241,"tags":432,"data":433},"country_codes",[392],{"codes":434},[435,438,441,444,447,450,453,456,459,462,465,468,471,474,477,480,483,486,489,492,495,498,501,504],{"code":436,"emoji":437},"IN","🇮🇳",{"code":439,"emoji":440},"ID","🇮🇩",{"code":442,"emoji":443},"EG","🇪🇬",{"code":445,"emoji":446},"PK","🇵🇰",{"code":448,"emoji":449},"MY","🇲🇾",{"code":451,"emoji":452},"VN","🇻🇳",{"code":454,"emoji":455},"UG","🇺🇬",{"code":457,"emoji":458},"PH","🇵🇭",{"code":460,"emoji":461},"BR","🇧🇷",{"code":463,"emoji":464},"ET","🇪🇹",{"code":466,"emoji":467},"BD","🇧🇩",{"code":469,"emoji":470},"NG","🇳🇬",{"code":472,"emoji":473},"KE","🇰🇪",{"code":475,"emoji":476},"IR","🇮🇷",{"code":478,"emoji":479},"MX","🇲🇽",{"code":481,"emoji":482},"TR","🇹🇷",{"code":484,"emoji":485},"DZ","🇩🇿",{"code":487,"emoji":488},"SD","🇸🇩",{"code":490,"emoji":491},"AO","🇦🇴",{"code":493,"emoji":494},"PE","🇵🇪",{"code":496,"emoji":497},"GH","🇬🇭",{"code":499,"emoji":500},"MZ","🇲🇿",{"code":502,"emoji":503},"IQ","🇮🇶",{"code":505,"emoji":506},"UZ","🇺🇿",{"key":508,"text":509,"tags":510,"data":514},"free_labs_page","free labs 页面 TDK",[392,511,512,513],"trial_user","pro_user","not_logged_in",{"free_labs_page":515},[516,522,528,534,540,546,552,558,564],{"description":517,"lang":251,"meta_description":518,"meta_keywords":519,"meta_title":520,"title":521},"1000+ Free Interactive Labs in 30+ Tech Fields for Developers and Students. Practice and enhance your skills with free hands-on exercises and real-world scenarios.\n","Discover LabEx's 1000+ free interactive labs across Linux, DevOps, Cybersecurity, Data Science, Web Development, Machine Learning, and more. Gain free access to expert-led training and hands-on practice in a dynamic environment.\n","Free Labs, LabEx, Interactive Labs, Free Tech Skills, Free Hands-On Practice, Online Learning\n","Free Labs | Interactive Practice in 30+ Tech Fields","Free Labs",{"description":523,"lang":243,"meta_description":524,"meta_keywords":525,"meta_title":526,"title":527},"为开发者和学生量身打造的 1000+ 免费互动实验，覆盖 30+ 技术领域。 通过免费实践练习和真实场景，提升您的技能。\n","探索 LabEx 提供的 1000+ 免费互动实验，涵盖 Linux、DevOps、网络安全、数据科学、 Web 开发、机器学习等领域。在动态环境中免费获得专家指导的培训和实践机会。\n","免费实验, LabEx, 互动实验, 免费技术技能, 免费实践练习, 在线学习\n","免费实验 | 30+ 技术领域互动实践","免费实验",{"description":529,"lang":244,"meta_description":530,"meta_keywords":531,"meta_title":532,"title":533},"Más de 1000 laboratorios interactivos gratuitos en más de 30 áreas tecnológicas para desarrolladores y estudiantes. Mejora tus habilidades con ejercicios prácticos gratuitos y escenarios del mundo real.\n","Explora más de 1000 laboratorios interactivos gratuitos de LabEx en Linux, DevOps, Ciberseguridad, Ciencia de Datos, Desarrollo Web, Machine Learning y más. Accede gratis a formación guiada por expertos y práctica en entornos dinámicos.\n","Laboratorios Gratuitos, LabEx, Laboratorios Interactivos, Habilidades Técnicas Gratis, Práctica Práctica Gratuita, Aprendizaje en Línea\n","Laboratorios Gratuitos | Práctica Interactiva en Más de 30 Áreas Tecnológicas","Laboratorios Gratuitos",{"description":535,"lang":245,"meta_description":536,"meta_keywords":537,"meta_title":538,"title":539},"Plus de 1000 laboratoires interactifs gratuits dans plus de 30 domaines technologiques pour les développeurs et les étudiants. Améliorez vos compétences avec des exercices pratiques gratuits et des scénarios réels.\n","Découvrez plus de 1000 laboratoires interactifs gratuits de LabEx en Linux, DevOps, Cybersécurité, Science des Données, Développement Web, Machine Learning et plus encore. Accédez gratuitement à des formations dirigées par des experts et à des exercices pratiques dans un environnement dynamique.\n","Laboratoires Gratuits, LabEx, Laboratoires Interactifs, Compétences Techniques Gratuites, Pratique Pratique Gratuite, Apprentissage en Ligne\n","Laboratoires Gratuits | Pratique Interactive dans Plus de 30 Domaines Technologiques","Laboratoires Gratuits",{"description":541,"lang":246,"meta_description":542,"meta_keywords":543,"meta_title":544,"title":545},"Über 1000 kostenlose interaktive Labs in über 30 Technologiebereichen für Entwickler und Studierende. Verbessere deine Fähigkeiten mit kostenlosen praktischen Übungen und realen Szenarien.\n","Entdecke über 1000 kostenlose interaktive Labs von LabEx in Bereichen wie Linux, DevOps, Cybersicherheit, Datenwissenschaft, Webentwicklung, maschinelles Lernen und mehr. Erhalte kostenlosen Zugang zu von Experten geleiteten Schulungen und praktischen Übungen in einer dynamischen Umgebung.\n","Kostenlose Labs, LabEx, Interaktive Labs, Kostenlose Technische Fähigkeiten, Kostenlose Praktische Übungen, Online-Lernen\n","Kostenlose Labs | Interaktive Übungen in Über 30 Technologiebereichen","Kostenlose Labs",{"description":547,"lang":247,"meta_description":548,"meta_keywords":549,"meta_title":550,"title":551},"開発者や学生向けに、30以上の技術分野をカバーする1000以上の無料インタラクティブなラボ。 無料の実践練習と現実のシナリオでスキルを向上させましょう。\n","LabExの1000以上の無料インタラクティブなラボを、Linux、DevOps、サイバーセキュリティ、 データサイエンス、ウェブ開発、機械学習などで体験。専門家による指導とダイナミックな環境での 無料実践練習を利用できます。\n","無料ラボ, LabEx, インタラクティブなラボ, 無料技術スキル, 無料実践練習, オンライン学習\n","無料ラボ | 30以上の技術分野でインタラクティブな実践","無料ラボ",{"description":553,"lang":248,"meta_description":554,"meta_keywords":555,"meta_title":556,"title":557},"Более 1000 бесплатных интерактивных лабораторий в более чем 30 технических областях для разработчиков и студентов. Совершенствуйте свои навыки с бесплатными практическими упражнениями и реальными сценариями.\n","Ознакомьтесь с более чем 1000 бесплатных интерактивных лабораторий от LabEx по Linux, DevOps, кибербезопасности, науке о данных, веб-разработке, машинному обучению и многому другому. Получите бесплатный доступ к обучению под руководством экспертов и практическим упражнениям в динамичной среде.\n","Бесплатные Лаборатории, LabEx, Интерактивные Лаборатории, Бесплатные Технические Навыки, Бесплатная Практика, Онлайн-Обучение\n","Бесплатные Лаборатории | Интерактивная Практика в Более Чем 30 Технических Областях","Бесплатные Лаборатории",{"description":559,"lang":249,"meta_description":560,"meta_keywords":561,"meta_title":562,"title":563},"개발자와 학생을 위해 30개 이상의 기술 분야를 다루는 1000개 이상의 무료 인터랙티브 랩. 무료 실습 연습과 실제 시나리오로 스킬을 향상하세요.\n","LabEx의 1000개 이상의 무료 인터랙티브 랩을 통해 Linux, DevOps, 사이버 보안, 데이터 사이언스, 웹 개발, 머신 러닝 등을 탐구하세요. 전문가가 이끄는 교육과 동적 환경에서의 무료 실습 기회를 누리세요.\n","무료 랩, LabEx, 인터랙티브 랩, 무료 기술 스킬, 무료 실습 연습, 온라인 학습\n","무료 랩 | 30개 이상의 기술 분야에서 인터랙티브 연습","무료 랩",{"description":565,"lang":250,"meta_description":566,"meta_keywords":567,"meta_title":568,"title":569},"Mais de 1000 laboratórios interativos gratuitos em mais de 30 áreas tecnológicas para desenvolvedores e estudantes. 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Obtenha acesso gratuito a treinamentos liderados por especialistas e prática em ambientes dinâmicos.\n","Laboratórios Gratuitos, LabEx, Laboratórios Interativos, Habilidades Técnicas Gratuitas, Prática Prática Gratuita, Aprendizado Online\n","Laboratórios Gratuitos | Prática Interativa em Mais de 30 Áreas Tecnológicas","Laboratórios Gratuitos",{"key":571,"text":572,"tags":573,"data":574},"ai_check","ai inspect 是否开启",[392,511,512],{"ai_check":228},{"key":576,"text":577,"tags":578,"data":579},"exercises_page","Exercises 页面 TDK",[392,511,512,513],{"exercises_page":580},[581,587,593,599,605,611,617,623,629],{"description":582,"lang":251,"meta_description":583,"meta_keywords":584,"meta_title":585,"title":586},"Explore 2000+ hands-on exercises and real-world challenges across 30+ tech domains. Build your skills with guided practice and interactive scenarios.\n","Practice hands-on skills across Linux, Python, DevOps, Cybersecurity, and more. 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