javaS/dom4.html at main · sanojDD/javaS · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>DOM4</title>
</head>

<body style="background-color: #212121; color: white">
  <ul class="language">
    <li>javascript</li>
  </ul>

</body>
<script>
  //problemsin traversing to append the data in this method (non optimizing)
  function addLanguage(langName) {
    const li = document.createElement("li")//create li
    li.innerHTML = `${langName}`//add element to li
    document.querySelector(".language"). //select class to append the newly created element
      appendChild(li) //append to the class

  }
  addLanguage("python")
  addLanguage("Typescript")

  //optimized process
  //no need to traverse :create new node directly and append the child

  function addOptiLang(langName) {
    const li = document.createElement("li")
    li.appendChild(document.createTextNode(langName))
    document.querySelector(".language").appendChild(li)
  }

  addOptiLang("c++")
  //edit 1

  const secLang = document.querySelector("li:nth-child(2)")
  // secLang.innerHTML = "Mojo"

  //second approach
  const newLi = document.createElement("li")
  newLi.textContent = "Mojo"
  secLang.replaceWith (newLi)

  //edit 2
  const firstLang = document.querySelector('li:first-child')
  firstLang.outerHTML = '<li> Typescript1 </li>'

  //remove
  const lastLang = document.querySelector("li:last-child")
  lastLang.remove()


</script>

</html>