{"id":3994,"date":"2022-03-24T12:30:23","date_gmt":"2022-03-24T12:30:23","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=3994"},"modified":"2022-05-04T07:23:36","modified_gmt":"2022-05-04T07:23:36","slug":"what-is-react-dom","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/reactjs\/what-is-react-dom\/","title":{"rendered":"What is React DOM ?"},"content":{"rendered":"<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-4281 aligncenter\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-virtual-dom.jpg\" alt=\"\" width=\"1291\" height=\"663\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-virtual-dom.jpg 1291w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-virtual-dom-300x154.jpg 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-virtual-dom-1024x526.jpg 1024w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-virtual-dom-768x394.jpg 768w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-virtual-dom-390x200.jpg 390w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-virtual-dom-820x421.jpg 820w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-virtual-dom-1180x606.jpg 1180w\" sizes=\"(max-width: 1291px) 100vw, 1291px\" \/><\/p>\n<ul>\n<li style=\"text-align: justify;\">It is an object which exposes a number of top level APIs to interact with the browser DOM.<\/li>\n<li style=\"text-align: justify;\">It provides DOM-specific methods that can be used at the top level of a web app to enable an efficient way of managing DOM elements of the web page.<\/li>\n<li style=\"text-align: justify;\">Most of your components should not need to use this module.<\/li>\n<li style=\"text-align: justify;\">It consists of following methods:\n<ul>\n<li style=\"text-align: justify;\">render ()<\/li>\n<li style=\"text-align: justify;\">findDOMNode ()<\/li>\n<li style=\"text-align: justify;\">unmountComponentAtNode ()<\/li>\n<li style=\"text-align: justify;\">create Portal ()<\/li>\n<li style=\"text-align: justify;\">hydrate ()<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-4062\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-dom.png\" alt=\"\" width=\"795\" height=\"341\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-dom.png 795w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-dom-300x129.png 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-dom-768x329.png 768w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-dom-390x167.png 390w\" sizes=\"(max-width: 795px) 100vw, 795px\" \/><\/p>\n<h4 id=\"render\" style=\"text-align: justify;\"><strong>render ()<\/strong><\/h4>\n<ul style=\"text-align: justify;\">\n<li>It\u00a0is used to render a single React Component or several Components wrapped together in a Component or a div element.<\/li>\n<li>In ReactDom it is one of the most important methods.<\/li>\n<li>This function uses the efficient methods of React for updating the DOM by being able to change only a subtree, efficient diff methods, etc.<\/li>\n<li>Element, Container, Callback are three parameters used in this method.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong>Syntax<\/strong>:<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" class=\"aligncenter wp-image-3997 size-full\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/render-syntax.png\" alt=\"\" width=\"723\" height=\"100\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/render-syntax.png 723w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/render-syntax-300x41.png 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/render-syntax-390x54.png 390w\" sizes=\"(max-width: 723px) 100vw, 723px\" \/><\/p>\n<h4 id=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4282 aligncenter\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-dom.jpg\" alt=\"\" width=\"1160\" height=\"654\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-dom.jpg 1160w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-dom-300x169.jpg 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-dom-1024x577.jpg 1024w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-dom-768x433.jpg 768w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-dom-390x220.jpg 390w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/react-dom-820x462.jpg 820w\" sizes=\"(max-width: 1160px) 100vw, 1160px\" \/><\/h4>\n<h4 id=\"finddomnode\" style=\"text-align: justify;\">findDOMNode ()<\/h4>\n<ul style=\"text-align: justify;\">\n<li>It is used to get the DOM node where a particular React component was rendered.<\/li>\n<li>The following method can be done by adding a <strong>ref<\/strong> attribute to each component itself and it is used rarely in ReactDOM.<\/li>\n<li>It is also useful for reading values out of the DOM, such as form field values and performing DOM measurements.<\/li>\n<li>A single parameter component that expects a React Component to be searched in the Browser DOM.<\/li>\n<\/ul>\n<p><strong>Syntax<\/strong>:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-3999 size-full\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/finddomnode-syntax.png\" alt=\"\" width=\"761\" height=\"109\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/finddomnode-syntax.png 761w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/finddomnode-syntax-300x43.png 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/finddomnode-syntax-390x56.png 390w\" sizes=\"(max-width: 761px) 100vw, 761px\" \/><\/p>\n<h4 id=\"unmountcomponentatnode\" style=\"text-align: justify;\"><strong>unmountComponentAtNode ()<\/strong><\/h4>\n<ul style=\"text-align: justify;\">\n<li>It is used to unmount or remove the React Component that was rendered to a particular container.<\/li>\n<li>It is better to remove the component, making the web page more efficient.<\/li>\n<li>A single parameter container which expects the DOM container from which the React component has to be removed.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong>Syntax<\/strong>:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-3998 size-full\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/unmountComponentNode-syntax.png\" alt=\"\" width=\"756\" height=\"107\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/unmountComponentNode-syntax.png 756w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/unmountComponentNode-syntax-300x42.png 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/unmountComponentNode-syntax-390x55.png 390w\" sizes=\"(max-width: 756px) 100vw, 756px\" \/><\/p>\n<h4 id=\"create-portal\" style=\"text-align: justify;\"><strong>create Portal ()<\/strong><\/h4>\n<ul style=\"text-align: justify;\">\n<li>It is used to create a portal and provide a way to\u00a0render children into a DOM node that exists outside the hierarchy of the DOM component.<\/li>\n<li>It allows us to render a component into a DOM node that resides outside the current DOM hierarchy of the parent component.<\/li>\n<li>Child, Container\u00a0are the two parameters used in this method.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong>Syntax<\/strong>:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-3995 size-full\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/find-dom-node-syntax.png\" alt=\"\" width=\"860\" height=\"136\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/find-dom-node-syntax.png 860w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/find-dom-node-syntax-300x47.png 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/find-dom-node-syntax-768x121.png 768w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/find-dom-node-syntax-390x62.png 390w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/find-dom-node-syntax-820x130.png 820w\" sizes=\"(max-width: 860px) 100vw, 860px\" \/><\/p>\n<h4 id=\"hydrate\" style=\"text-align: justify;\">hydrate ()<\/h4>\n<ul style=\"text-align: justify;\">\n<li>It is equivalent to the render () method, but is implemented while using server-side rendering.<\/li>\n<li>Element, Container, Callback are the three parameters used in this method.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong>Syntax<\/strong>:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-3996 size-full\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/hydrate-syntax.png\" alt=\"\" width=\"866\" height=\"144\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/hydrate-syntax.png 866w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/hydrate-syntax-300x50.png 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/hydrate-syntax-768x128.png 768w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/hydrate-syntax-390x65.png 390w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/03\/hydrate-syntax-820x136.png 820w\" sizes=\"(max-width: 866px) 100vw, 866px\" \/><\/p>\n<p style=\"text-align: justify;\">\n","protected":false},"excerpt":{"rendered":"<p>It is an object which exposes a number of top level APIs to interact with the browser DOM. It provides DOM-specific methods that can be used at the top level of a web app to enable an efficient way of managing DOM elements of the web page. Most of your components should not need to [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16542],"tags":[16662,16737,16738,16735,16739,16736,16734,16733,16731,16732,16654,16655,16743,16740,16741,16726,16744,16745,16659,16742],"class_list":["post-3994","post","type-post","status-publish","format-standard","hentry","category-reactjs","tag-advantages-of-virtual-dom-in-react","tag-finddomnode","tag-import-react-dom","tag-react-dom-full-form","tag-react-dom-install","tag-react-dom-npm","tag-react-router-dom","tag-react-vs-reactdom","tag-reactdom","tag-rendering-elements","tag-virtual-dom","tag-virtual-dom-in-react","tag-what-is-dom-in-react-native","tag-what-is-react-dom","tag-what-is-react-dom-server","tag-what-is-react-router-dom","tag-what-is-real-dom-in-react-js","tag-what-is-the-difference-between-react-router-and-react-router-dom","tag-what-is-virtual-dom-in-react","tag-what-is-virtual-dom-in-react-native"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is React DOM ? 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