JavaScript-Interview-Questions/dom-manipulation.html at master · FADL285/JavaScript-Interview-Questions · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <title>DOM Manipulation in JS</title>
  </head>
  <body>
    <div id="divId" class="main">DOM Manipulation in JavaScript</div>
    <br /><br />
    <button onclick="scrollWin()">Click me to scroll</button>
    <br /><br />

    <button onclick="removeHandler()">Remove EventListener</button>

    <p id="demo"></p>

    <ul id="items"></ul>
  </body>
  <script>
    document.getElementById('divId').innerHTML = "<section><p>DOM Manipulation in JavaScript <a href='https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Manipulating_documents' target='_blank'>Manipulating documents</a></p></section>"; //Assigning new value

    var str = document.getElementsByTagName('div').value; //Get div value

    var str = document.getElementsByClassName('main').value; //Get div value using class "main"

    document.getElementById('divId').style.color = 'red'; //Applying css style to div

    console.log('innerWidth: ' + window.innerWidth);
    console.log('innerHeight: ' + window.innerHeight);
    console.log('outerWidth: ' + window.outerWidth);
    console.log('outerHeight: ' + window.outerHeight);
    console.log('hasOwnProperty: ' + window.hasOwnProperty);
    console.log('title: ' + window.document.title); // The document title
    console.log('body: ' + window.document.body); // The body element
    console.log('URL: ' + window.document.URL); // Window URL
    console.log('all: ' + window.document.all); // all
    console.log('documentElement: ' + document.documentElement); // documentElement

    // window.scrollTo()
    function scrollWin() {
      window.scrollTo({
        top: 100,
        left: 100,
        behavior: 'smooth'
      });
    }

    // window.onload
    window.onload = function() {
      console.log('window.onload(): Window onload function called !');
    };

    document.querySelector('body').innerHTML; // Get the Content
    document.querySelector('body').outerHTML; // Get the Content with html tag
    console.log('className(): ' + document.querySelector('#divId').className); // Get the class name
    console.log('classList(): ' + document.querySelector('#divId').classList); // Get all class name in array
    console.log('attributes(): ' + document.querySelector('#divId').attributes); // Get the attributes

    // querySelectorAll()
    document.querySelectorAll('.main p'); // Get all elements matching specified selectors(s);

    // querySelector()
    document.querySelector('.main a'); // Get the main element matching specified selectors(s);
    //document.querySelector('a').hasAttribute('target');
    //document.querySelector('a').setAttribute('target', '_blank');
    document.querySelector('.main').style.color = 'green';
    document.querySelector('.main').style.backgroundColor = 'blue';
    document.querySelector('body').classList.add('.new-class'); // Append new class
    document.querySelector('body').classList.toggle('.new-class');
    document.querySelector('body').classList.contains('.new-class');
    document.querySelector('.main').style.cssText = 'padding: 1em; color: white; background-color: red;';

    // getAttribute()
    console.log('getAttribute(): ' + document.getElementById('divId').getAttribute('class'));

    // setAttribute()
    document.querySelector('.main').setAttribute('style', 'padding: 2em');

    // addEventListener()
    document.addEventListener('click', function() {
      document.getElementById('divId').innerHTML = 'Updated Text on click !';
    });

    // removeEventListener()
    document.querySelector('body').addEventListener('mousemove', getCoords);

    function getCoords() {
      document.getElementById('demo').innerHTML = 'X coords: ' + event.clientX + ', Y coords: ' + event.clientY;
    }

    function removeHandler() {
      document.querySelector('body').removeEventListener('mousemove', getCoords);
    }

    // appendChild()
    var arr = ['One', 'Two', 'Three', 'Four', 'Five'];
    for (var i = 0; i < 5; i++) {
      var node = document.createElement('li'); // Create a <li> node
      var textnode = document.createTextNode(arr[i]); // Create a text node
      node.appendChild(textnode); // Append the text to <li>
      document.getElementById('items').appendChild(node); // Append <li> to <ul> with id="demo"
    }

    // replaceChild()
    var textnode = document.createTextNode("Six");
    var item = document.getElementById("items").childNodes[0];
    item.replaceChild(textnode,item.childNodes[0]);

    // removeChild()
    var list = document.getElementById("items");   // Get the <ul> element with id="items"
    list.removeChild(list.childNodes[1]);

    // CloneNode()
    let clone = document.querySelector('#items').cloneNode( true );
    clone.setAttribute( 'id', 'newId' ); // Set new Id
    document.getElementById('items').appendChild(clone);

    // insertBefore()
    var newItem = document.createElement("li");
    var textnode = document.createTextNode("One");
    newItem.appendChild(textnode);
    var list = document.getElementById("items");
    list.insertBefore(newItem, list.childNodes[0]);

  </script>
</html>