The DOM represents it as:
\n<\/p>\n\n
- Document\n - html\n - head\n - title\n - body\n - h1\n - p\n<\/pre>\n\n\n\n\n
\n\n\n \n \n Accessing the DOM<\/strong>\n<\/h3>\n\n
JavaScript provides methods to select and manipulate DOM elements. <\/p>\n\n
\n \n \n Common Selection Methods<\/strong>\n<\/h4>\n\n
\n
- \ngetElementById<\/strong>\nSelects an element by its ID.\n<\/li>\n<\/ol>\n\n
const title = document.getElementById(\"title\");\n console.log(title.innerText); \/\/ Output: Hello, DOM!\n<\/pre>\n\n\n\n\n
- \ngetElementsByClassName<\/strong>\nSelects elements by their class name (returns a collection).\n<\/li>\n<\/ol>\n\n
const paragraphs = document.getElementsByClassName(\"description\");\n console.log(paragraphs[0].innerText);\n<\/pre>\n\n\n\n\n
- \ngetElementsByTagName<\/strong>\nSelects elements by their tag name (e.g., div, p).\n<\/li>\n<\/ol>\n\n
const headings = document.getElementsByTagName(\"h1\");\n console.log(headings[0].innerText);\n<\/pre>\n\n\n\n\n
- \nquerySelector<\/strong>\nSelects the first element matching a CSS selector.\n<\/li>\n<\/ol>\n\n
const title = document.querySelector(\"#title\");\n<\/pre>\n\n\n\n\n
- \nquerySelectorAll<\/strong>\nSelects all elements matching a CSS selector (returns a NodeList).\n<\/li>\n<\/ol>\n\n
const paragraphs = document.querySelectorAll(\".description\");\n<\/pre>\n\n\n\n\n
\n\n\n \n \n DOM Manipulation<\/strong>\n<\/h3>\n\n
Once selected, you can modify elements, attributes, and content dynamically.<\/p>\n\n
\n \n \n 1. Changing Content<\/strong>\n<\/h4>\n\n<\/pre>\n
\n
- \ninnerHTML<\/strong>: Sets or gets HTML content.\n<\/li>\n<\/ul>\n\n
document.getElementById(\"title\").innerHTML = \"Welcome to the DOM!\";\n<\/pre>\n\n\n\n\n
- \ninnerText<\/strong> or textContent<\/strong>: Sets or gets plain text.\n<\/li>\n<\/ul>\n\n
document.getElementById(\"title\").innerText = \"Hello, World!\";\n<\/pre>\n\n\n\n\n \n \n 2. Changing Attributes<\/strong>\n<\/h4>\n\n
\n
- Use setAttribute and getAttribute to modify element attributes.\n<\/li>\n<\/ul>\n\n
const link = document.querySelector(\"a\");\n link.setAttribute(\"href\", \"https:\/\/example.com\");\n<\/pre>\n\n\n\n\n
- Directly modify attributes like id, className, or src.\n<\/li>\n<\/ul>\n\n
const image = document.querySelector(\"img\");\n image.src = \"image.jpg\";\n<\/pre>\n\n\n\n\n \n \n 3. Changing Styles<\/strong>\n<\/h4>\n\n
Modify CSS properties directly.
\n<\/p>\n\n\n \nDOM Example<\/title>\n <\/head>\n <body> <h1><a href="http://miracleart.cn/">国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂</a></h1>\n <h1>\n\n\n\n<p>The DOM represents it as:<br>\n<\/p>\n\n<pre>- Document\n - html\n - head\n - title\n - body\n - h1\n - p\n<\/pre>\n\n\n\n\n<hr>\n\n<h3>\n \n \n <strong>Adding and Removing Elements<\/strong>\n<\/h3>\n\n<h4>\n \n \n <strong>1. Adding Elements<\/strong>\n<\/h4>\n\n<\/pre>\n<ul>\n<li>\n<strong>createElement<\/strong>: Creates a new element.\n<\/li>\n<li>\n<strong>appendChild<\/strong>: Appends an element to a parent.\n<\/li>\n<\/ul>\n\n<pre> const title = document.getElementById(\"title\");\n console.log(title.innerText); \/\/ Output: Hello, DOM!\n<\/pre>\n\n\n\n<h4>\n \n \n <strong>2. Removing Elements<\/strong>\n<\/h4>\n\n<ul>\n<li>\n<strong>removeChild<\/strong>: Removes a child element.\n<\/li>\n<\/ul>\n\n<pre> const paragraphs = document.getElementsByClassName(\"description\");\n console.log(paragraphs[0].innerText);\n<\/pre>\n\n\n\n\n<hr>\n\n<h3>\n \n \n <strong>Event Handling in the DOM<\/strong>\n<\/h3>\n\n<p>Events are actions or occurrences detected by the browser, such as clicks or key presses. <\/p>\n\n<h4>\n \n \n <strong>Adding Event Listeners<\/strong>\n<\/h4>\n\n<p>Use addEventListener to bind events to elements.<br>\n<\/p>\n\n<pre> const headings = document.getElementsByTagName(\"h1\");\n console.log(headings[0].innerText);\n<\/pre>\n\n\n\n<h4>\n \n \n <strong>Common Events<\/strong>\n<\/h4>\n\n<ol>\n<li>\n<strong>Mouse Events<\/strong>: click, dblclick, mouseover, mouseout\n<\/li>\n<li>\n<strong>Keyboard Events<\/strong>: keydown, keyup\n<\/li>\n<li>\n<strong>Form Events<\/strong>: submit, change, focus\n<\/li>\n<\/ol>\n\n\n<hr>\n\n<h3>\n \n \n <strong>Traversing the DOM<\/strong>\n<\/h3>\n\n<p>You can navigate between elements using relationships in the DOM tree.<\/p>\n\n<h4>\n \n \n <strong>Parent and Children<\/strong>\n<\/h4>\n\n<ul>\n<li>\n<strong>parentNode<\/strong>: Gets the parent node.\n<\/li>\n<li>\n<strong>childNodes<\/strong>: Lists all child nodes.\n<\/li>\n<li>\n<strong>children<\/strong>: Lists all child elements.\n<\/li>\n<\/ul>\n\n<pre> const title = document.querySelector(\"#title\");\n<\/pre>\n\n\n\n<h4>\n \n \n <strong>Siblings<\/strong>\n<\/h4>\n\n<ul>\n<li>\n<strong>nextSibling<\/strong>: Gets the next sibling node.\n<\/li>\n<li>\n<strong>previousSibling<\/strong>: Gets the previous sibling node.\n<\/li>\n<\/ul>\n\n\n<hr>\n\n<h3>\n \n \n <strong>Advanced DOM Features<\/strong>\n<\/h3>\n\n<h4>\n \n \n <strong>1. Cloning Elements<\/strong>\n<\/h4>\n\n<p>Create a duplicate of an element using cloneNode.<br>\n<\/p>\n\n<pre> const paragraphs = document.querySelectorAll(\".description\");\n<\/pre>\n\n\n\n<h4>\n \n \n <strong>2. Working with Classes<\/strong>\n<\/h4>\n\n<p>Use the classList property to manipulate classes.<br>\n<\/p>\n\n<pre> document.getElementById(\"title\").innerHTML = \"Welcome to the DOM!\";\n<\/pre>\n\n\n\n<h4>\n \n \n <strong>3. Using Templates<\/strong>\n<\/h4>\n\n<p>HTML templates allow reusable content.<br>\n<\/p>\n\n<pre> document.getElementById(\"title\").innerText = \"Hello, World!\";\n<\/pre>\n\n\n\n\n<hr>\n\n<h3>\n \n \n <strong>Best Practices for DOM Manipulation<\/strong>\n<\/h3>\n\n<ol>\n<li>\n<p><strong>Minimize Reflows and Repaints<\/strong>: <\/p>\n\n<ul>\n<li>Batch DOM changes to avoid excessive rendering.\n<\/li>\n<li>Use documentFragment for multiple updates.\n<\/li>\n<\/ul>\n<\/li>\n<li><p><strong>Use Event Delegation<\/strong>:<br><br>\nAttach events to parent elements instead of individual child elements.<br>\n<\/p><\/li>\n<\/ol>\n\n<pre><!DOCTYPE html>\n<html>\n <head>\n <title>DOM Example<\/title>\n <\/head>\n <body>\n <h1>\n\n\n\n<p>The DOM represents it as:<br>\n<\/p>\n\n<pre>- Document\n - html\n - head\n - title\n - body\n - h1\n - p\n<\/pre>\n\n\n\n<ol>\n<li>\n<strong>Avoid Inline JavaScript<\/strong>:\nUse external scripts or addEventListener for clean separation of code.<\/li>\n<\/ol>\n\n\n<hr>\n\n<h3>\n \n \n <strong>Conclusion<\/strong>\n<\/h3>\n\n<p>The JavaScript HTML DOM is a powerful tool for creating dynamic and interactive web pages. By mastering DOM manipulation, event handling, and best practices, developers can build responsive and user-friendly applications that enhance the overall user experience.<\/p>\n\n<p><strong>Hi, I'm Abhay Singh Kathayat!<\/strong><br>\nI am a full-stack developer with expertise in both front-end and back-end technologies. I work with a variety of programming languages and frameworks to build efficient, scalable, and user-friendly applications.<br>\nFeel free to reach out to me at my business email: kaashshorts28@gmail.com.<\/p>\n\n\n \n\n \n <\/pre>"} </script> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <body data-commit-time="2023-12-28T14:50:12+08:00" class="editor_body body2_2"> <link rel="stylesheet" type="text/css" href="/static/csshw/stylehw.css"> <header> <div id="377j5v51b" class="head"> <div id="377j5v51b" class="haed_left"> <div id="377j5v51b" class="haed_logo"> <a href="http://miracleart.cn/" title="" class="haed_logo_a"> <img src="/static/imghw/logo.png" alt="" class="haed_logoimg"> </a> </div> <div id="377j5v51b" class="head_nav"> <div id="377j5v51b" class="head_navs"> <a href="javascript:;" title="Community" class="head_nava 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class="phpgenera_Details_mainL1a">JS Tutorial</a> <img src="/static/imghw/top_right.png" alt="" /> <span>Mastering the JavaScript HTML DOM: Building Dynamic and Interactive Webpages</span> </div> <div id="377j5v51b" class="Articlelist_txts"> <div id="377j5v51b" class="Articlelist_txts_info"> <h1 class="Articlelist_txts_title">Mastering the JavaScript HTML DOM: Building Dynamic and Interactive Webpages</h1> <div id="377j5v51b" class="Articlelist_txts_info_head"> <div id="377j5v51b" class="author_info"> <a href="http://miracleart.cn/member/1468492.html" class="author_avatar"> <img class="lazy" data-src="https://img.php.cn/upload/avatar/000/000/001/66ea8147b1057383.png" src="/static/imghw/default1.png" alt="Mary-Kate Olsen"> </a> <div id="377j5v51b" class="author_detail"> <a href="http://miracleart.cn/member/1468492.html" class="author_name">Mary-Kate Olsen</a> </div> </div> </div> <span id="377j5v51b" class="Articlelist_txts_time">Dec 20, 2024 am 02:57 AM</span> </div> </div> <hr /> <div id="377j5v51b" class="article_main php-article"> <div id="377j5v51b" class="article-list-left detail-content-wrap content"> <ins class="adsbygoogle" style="display:block; text-align:center;" data-ad-layout="in-article" data-ad-format="fluid" data-ad-client="ca-pub-5902227090019525" data-ad-slot="3461856641"> </ins> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173463463582725.jpg" class="lazy" alt="Mastering the JavaScript HTML DOM: Building Dynamic and Interactive Webpages"></p> <h3> <strong>JavaScript HTML DOM: A Complete Guide</strong> </h3> <p>The <strong>Document Object Model (DOM)</strong> is a programming interface for web documents. It represents the structure of a webpage as a tree of objects, enabling developers to manipulate HTML and CSS using JavaScript. By mastering DOM, you can create dynamic, interactive web pages.</p> <hr> <h3> <strong>What is the DOM?</strong> </h3> <p>The DOM is a structured representation of an HTML document. It allows JavaScript to access and manipulate the elements, attributes, and content of a webpage dynamically. </p> <h4> Example: </h4> <p>For this HTML:<br> </p> <pre class="brush:php;toolbar:false"><!DOCTYPE html> <html> <head> <title>DOM Example</title> </head> <body> <h1> <p>The DOM represents it as:<br> </p> <pre class="brush:php;toolbar:false">- Document - html - head - title - body - h1 - p </pre> <hr> <h3> <strong>Accessing the DOM</strong> </h3> <p>JavaScript provides methods to select and manipulate DOM elements. </p> <h4> <strong>Common Selection Methods</strong> </h4> <ol> <li> <strong>getElementById</strong> Selects an element by its ID. </li> </ol> <pre class="brush:php;toolbar:false"> const title = document.getElementById("title"); console.log(title.innerText); // Output: Hello, DOM! </pre> <ol> <li> <strong>getElementsByClassName</strong> Selects elements by their class name (returns a collection). </li> </ol> <pre class="brush:php;toolbar:false"> const paragraphs = document.getElementsByClassName("description"); console.log(paragraphs[0].innerText); </pre> <ol> <li> <strong>getElementsByTagName</strong> Selects elements by their tag name (e.g., div, p). </li> </ol> <pre class="brush:php;toolbar:false"> const headings = document.getElementsByTagName("h1"); console.log(headings[0].innerText); </pre> <ol> <li> <strong>querySelector</strong> Selects the first element matching a CSS selector. </li> </ol> <pre class="brush:php;toolbar:false"> const title = document.querySelector("#title"); </pre> <ol> <li> <strong>querySelectorAll</strong> Selects all elements matching a CSS selector (returns a NodeList). </li> </ol> <pre class="brush:php;toolbar:false"> const paragraphs = document.querySelectorAll(".description"); </pre> <hr> <h3> <strong>DOM Manipulation</strong> </h3> <p>Once selected, you can modify elements, attributes, and content dynamically.</p> <h4> <strong>1. Changing Content</strong> </h4> </pre> <ul> <li> <strong>innerHTML</strong>: Sets or gets HTML content. </li> </ul> <pre class="brush:php;toolbar:false"> document.getElementById("title").innerHTML = "Welcome to the DOM!"; </pre> <ul> <li> <strong>innerText</strong> or <strong>textContent</strong>: Sets or gets plain text. </li> </ul> <pre class="brush:php;toolbar:false"> document.getElementById("title").innerText = "Hello, World!"; </pre> <h4> <strong>2. Changing Attributes</strong> </h4> <ul> <li>Use setAttribute and getAttribute to modify element attributes. </li> </ul> <pre class="brush:php;toolbar:false"> const link = document.querySelector("a"); link.setAttribute("href", "https://example.com"); </pre> <ul> <li>Directly modify attributes like id, className, or src. </li> </ul> <pre class="brush:php;toolbar:false"> const image = document.querySelector("img"); image.src = "image.jpg"; </pre> <h4> <strong>3. Changing Styles</strong> </h4> <p>Modify CSS properties directly.<br> </p> <pre class="brush:php;toolbar:false"><!DOCTYPE html> <html> <head> <title>DOM Example</title> </head> <body> <h1> <p>The DOM represents it as:<br> </p> <pre class="brush:php;toolbar:false">- Document - html - head - title - body - h1 - p </pre> <hr> <h3> <strong>Adding and Removing Elements</strong> </h3> <h4> <strong>1. Adding Elements</strong> </h4> </pre> <ul> <li> <strong>createElement</strong>: Creates a new element. </li> <li> <strong>appendChild</strong>: Appends an element to a parent. </li> </ul> <pre class="brush:php;toolbar:false"> const title = document.getElementById("title"); console.log(title.innerText); // Output: Hello, DOM! </pre> <h4> <strong>2. Removing Elements</strong> </h4> <ul> <li> <strong>removeChild</strong>: Removes a child element. </li> </ul> <pre class="brush:php;toolbar:false"> const paragraphs = document.getElementsByClassName("description"); console.log(paragraphs[0].innerText); </pre> <hr> <h3> <strong>Event Handling in the DOM</strong> </h3> <p>Events are actions or occurrences detected by the browser, such as clicks or key presses. </p> <h4> <strong>Adding Event Listeners</strong> </h4> <p>Use addEventListener to bind events to elements.<br> </p> <pre class="brush:php;toolbar:false"> const headings = document.getElementsByTagName("h1"); console.log(headings[0].innerText); </pre> <h4> <strong>Common Events</strong> </h4> <ol> <li> <strong>Mouse Events</strong>: click, dblclick, mouseover, mouseout </li> <li> <strong>Keyboard Events</strong>: keydown, keyup </li> <li> <strong>Form Events</strong>: submit, change, focus </li> </ol> <hr> <h3> <strong>Traversing the DOM</strong> </h3> <p>You can navigate between elements using relationships in the DOM tree.</p> <h4> <strong>Parent and Children</strong> </h4> <ul> <li> <strong>parentNode</strong>: Gets the parent node. </li> <li> <strong>childNodes</strong>: Lists all child nodes. </li> <li> <strong>children</strong>: Lists all child elements. </li> </ul> <pre class="brush:php;toolbar:false"> const title = document.querySelector("#title"); </pre> <h4> <strong>Siblings</strong> </h4> <ul> <li> <strong>nextSibling</strong>: Gets the next sibling node. </li> <li> <strong>previousSibling</strong>: Gets the previous sibling node. </li> </ul> <hr> <h3> <strong>Advanced DOM Features</strong> </h3> <h4> <strong>1. Cloning Elements</strong> </h4> <p>Create a duplicate of an element using cloneNode.<br> </p> <pre class="brush:php;toolbar:false"> const paragraphs = document.querySelectorAll(".description"); </pre> <h4> <strong>2. Working with Classes</strong> </h4> <p>Use the classList property to manipulate classes.<br> </p> <pre class="brush:php;toolbar:false"> document.getElementById("title").innerHTML = "Welcome to the DOM!"; </pre> <h4> <strong>3. Using Templates</strong> </h4> <p>HTML templates allow reusable content.<br> </p> <pre class="brush:php;toolbar:false"> document.getElementById("title").innerText = "Hello, World!"; </pre> <hr> <h3> <strong>Best Practices for DOM Manipulation</strong> </h3> <ol> <li> <p><strong>Minimize Reflows and Repaints</strong>: </p> <ul> <li>Batch DOM changes to avoid excessive rendering. </li> <li>Use documentFragment for multiple updates. </li> </ul> </li> <li><p><strong>Use Event Delegation</strong>:<br><br> Attach events to parent elements instead of individual child elements.<br> </p></li> </ol> <pre class="brush:php;toolbar:false"><!DOCTYPE html> <html> <head> <title>DOM Example</title> </head> <body> <h1> <p>The DOM represents it as:<br> </p> <pre class="brush:php;toolbar:false">- Document - html - head - title - body - h1 - p </pre> <ol> <li> <strong>Avoid Inline JavaScript</strong>: Use external scripts or addEventListener for clean separation of code.</li> </ol> <hr> <h3> <strong>Conclusion</strong> </h3> <p>The JavaScript HTML DOM is a powerful tool for creating dynamic and interactive web pages. By mastering DOM manipulation, event handling, and best practices, developers can build responsive and user-friendly applications that enhance the overall user experience.</p> <p><strong>Hi, I'm Abhay Singh Kathayat!</strong><br> I am a full-stack developer with expertise in both front-end and back-end technologies. I work with a variety of programming languages and frameworks to build efficient, scalable, and user-friendly applications.<br> Feel free to reach out to me at my business email: kaashshorts28@gmail.com.</p> </pre><p>The above is the detailed content of Mastering the JavaScript HTML DOM: Building Dynamic and Interactive Webpages. For more information, please follow other related articles on the PHP Chinese website!</p> </div> </div> <div id="377j5v51b" class="wzconShengming_sp"> <div id="377j5v51b" class="bzsmdiv_sp">Statement of this Website</div> <div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. 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