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dom-query-js.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>DOM: Query and Modify</title>
</head>
<body>
<h1 id="main-header">Hello World!</h1>
<ul>
<li data-dbid="1">Item 1</li>
<li data-dbid="2">Item 2</li>
<li data-dbid="3">Item 3</li>
<li data-dbid="4">Item 4</li>
<li data-dbid="5">Item 5</li>
</ul>
<h2 id="sub-header">Hello Again.</h2>
<p class="sub-paragraph">
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim
ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat. Duis aute irure dolor in
reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
pariatur. Excepteur sint occaecat cupidatat non proident, sunt in
culpa qui officia deserunt mollit anim id est laborum.
</p>
<button class="main-change">Modify Main Header</button>
<button class="sub-change">Modify Sub Header</button>
<button class="list-change">Modify List</button>
<button class="p-change">Modify Paragraph</button>
<script>
(function () {
"use strict";
const mainChange = () => {
// TODO: Uncomment next line and get the main header element by id
var mainHeader = document.getElementById('main-header');
// TODO: Set inner html of mainHeader to "JavaScript is Cool"
mainHeader.innerHTML = 'JavaScript is Cool'
}
const subChange = () => {
// TODO: Uncomment the next line and get the sub header element by id
var subHeader = document.getElementById('sub-header');
// TODO: Set the text color of subHeader to blue
subHeader.style.color = 'blue'
}
const listChange = () => {
// TODO: Uncomment the next line and get all list items
var listItems = document.getElementsByTagName('li');
// TODO: Set text color on every other list item to grey
for (let list of listItems) {
const id = list.getAttribute('data-dbid');
if (id % 2 == 0) {
list.style.color = 'grey'
} else if (id == 1) {
// TODO: Set text color of li with dbid = 1 to blue
list.style.color = 'blue'
}
}
}
const paraChange = () => {
// TODO: Uncomment the next line and get all elements with class name sub-paragraph
var subParagraphs = document.getElementsByClassName('sub-paragraph');
// TODO: Change the text in the first sub paragraph to "Mission Accomplished!"
subParagraphs[0].innerHTML = 'Mission Accomplished'
}
//selected buttons
const mainBtn = document.querySelector('.main-change')
const subBtn = document.querySelector('.sub-change')
const listBtn = document.querySelector('.list-change')
const paraBtn = document.querySelector('.p-change')
//on click functions
mainBtn.addEventListener('click', mainChange)
subBtn.addEventListener('click', subChange)
listBtn.addEventListener('click', listChange)
paraBtn.addEventListener('click', paraChange)
})();
</script>
</body>
</html>