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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>
<p>
<button id="headerBtn">Click Me to change the header</button>
</p>
<h1 id="main-header">Hello World!</h1>
<p>
<button id="list-btn">Click Me to change list colors</button>
</p>
<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>
<p>
<button id="listOne-btn">Click Me to change one list to blue</button>
</p>
<p>
</p>
<h2 id="sub-header">Hello Again.</h2>
<p>
<button id="subheader-btn">Click Me to change the sub header color</button>
</p>
<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>
<p>
<button id="mission-btn">Click Me to change the sub header text</button>
</p>
<script>
(function() {
"use strict";
/////GLOBAL VARIABLES
let mainHeader = document.getElementById(`main-header`) ;
let subHeader = document.getElementById(`sub-header`);
let listItems = document.getElementsByTagName(`li`);
let subParagraphs = document.getElementsByClassName(`sub-paragraph`);
//// BUTTONS
let headerBtn = document.getElementById(`headerBtn`);
let subheadBtn = document.getElementById(`subheader-btn`);
let listBtn = document.getElementById(`list-btn`);
let listOneBtn = document.getElementById(`listOne-btn`);
let missionBtn = document.getElementById(`mission-btn`);
///// EVENT LISTENERS
headerBtn.addEventListener('click', changeHeader );
subheadBtn.addEventListener(`click`, subheaderColor);
listBtn.addEventListener(`click`, listColorChange);
listOneBtn.addEventListener(`click`, oneListToBlue);
missionBtn.addEventListener(`click`, mission);
///// functions
function changeHeader(){
mainHeader.innerHTML = `JavaScript is Cool`;
}
function subheaderColor(){
subHeader.style.color = `blue`;
}
function listColorChange(){
for (let i = 0; i < listItems.length; i++){
if ((i % 2) > 0){ listItems[i].style.color = `grey`;
}
}
}
function oneListToBlue(){
for (let i = 0; i < listItems.length; i++){
let dbid1 = listItems[i].getAttribute(`data-dbid`)
if (dbid1 === `1`) {listItems[i].style.color = `blue`;}
}
}
function mission(){
subParagraphs.item(0).innerHTML = `Mission Accomplished!`;
}
// // TODO: Uncomment next line and get the main header element by id
// let mainHeader = document.getElementById(`main-header`) ;
//
// // TODO: Set inner html of mainHeader to "JavaScript is Cool"
// mainHeader.innerHTML = `JavaScript is Cool`;
// // TODO: Uncomment the next line and get the sub header element by id
// let subHeader = document.getElementById(`sub-header`);
//
// // TODO: Set the text color of subHeader to blue
// subHeader.style.color = `blue`;
// // TODO: Uncomment the next line and get all list items
// let listItems = document.getElementsByTagName(`li`);
//
// // TODO: Set text color on every other list item to grey
// for (let i = 0; i < listItems.length; i++){
// if ((i % 2) > 0){ listItems[i].style.color = `grey`;
// }
// }
// // TODO: Set text color of li with dbid = 1 to blue
// for (let i = 0; i < listItems.length; i++){
// let dbid1 = listItems[i].getAttribute(`data-dbid`)
// if (dbid1 === `1`) {listItems[i].style.color = `blue`;}
// }
//
// // TODO: Uncomment the next line and get all elements with class name sub-paragraph
// let subParagraphs = document.getElementsByClassName(`sub-paragraph`);
//
// // TODO: Change the text in the first sub paragraph to "Mission Accomplished!"
// subParagraphs.item(0).innerHTML = `Mission Accomplished!`;
})();
</script>
</body>
</html>