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Copy pathDay24_ChristmasTreeLights.js
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Day24_ChristmasTreeLights.js
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<!-- <!doctype html>
<html>
<head>
<title>Christmas Tree Lights Sequencer</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<section>
<img src="/tree1.png" alt="christmas tree">
<div class="star">⭐️</div>
<div class="lights red"></div>
<div class="lights blue"></div>
<div class="lights blue"></div>
<div class="lights red"></div>
<div class="lights red"></div>
<div class="lights blue"></div>
<div class="lights blue"></div>
<div class="lights red"></div>
<div class="lights red"></div>
<div class="lights blue"></div>
<div class="lights red"></div>
<div class="lights blue"></div>
</section>
<script src="index.js"></script>
</body>
</html>
html, body {
margin: 0;
padding: 0;
}
body {
background-color: #abb997;
display: flex;
align-items: center;
height: 100vh;
}
section {
max-width: 250px;
margin: 0 auto;
position: relative;
}
img {
max-width: 100%;
}
.star{
top: 60px;
left: 108px;
font-size: 2em;
position: absolute;
}
.lights {
width: 17px;
height: 17px;
position: absolute;
border-radius: 50%;
}
.lights:nth-child(3) {
top: 118px;
left: 95px;
}
.lights:nth-child(4) {
top: 118px;
left: 135px;
}
.lights:nth-child(5) {
top: 172px;
left: 70px;
}
.lights:nth-child(6) {
top: 180px;
left: 165px;
}
.lights:nth-child(7) {
top: 230px;
left: 50px;
}
.lights:nth-child(8) {
top: 223px;
left: 175px;
}
.lights:nth-child(9) {
top: 280px;
left: 40px;
}
.lights:nth-child(10) {
top: 280px;
left: 190px;
}
.lights:nth-child(11) {
top: 150px;
left: 120px;
}
.lights:nth-child(12) {
top: 200px;
left: 120px;
}
.lights:nth-child(13) {
top: 250px;
left: 120px;
}
.lights:nth-child(14) {
top: 290px;
left: 120px;
}
.red {
background: radial-gradient(circle at 65% 15%, white 1px, #FF3131 30%, darkred 60%, aqua 100%);
filter: brightness(.8);
}
.blue {
background: radial-gradient(circle at 65% 15%, white 1px, aqua 30%, darkblue 60%, aqua 100%);
filter: brightness(.8);
}
.lights-on {
filter: unset;
}
-->
// /**
// * 🎄 Challenge:
// * 1. The Christmas tree's lights should switch
// * on and off every 800 miliseconds.
// *
// * Stretch Goal:
// * Make the blue and red lights flash alternately.
// **/
function switchLights() {
setInterval(function() {
let redLights = document.getElementsByClassName("red")
let blueLights = document.getElementsByClassName("blue")
// turn on red lights
for (let i = 0; i < redLights.length; i++) {
redLights[i].style.filter = "none"
}
// turn off red lights after 1.5 seconds
setTimeout(function() {
for (let i = 0; i < redLights.length; i++) {
redLights[i].style.filter = "grayscale(100%)"
}
}, 1500)
// turn on blue lights after 1.5 seconds
setTimeout(function() {
for (let i = 0; i < blueLights.length; i++) {
blueLights[i].style.filter = "none"
}
}, 1500)
// turn off blue lights after 1.5 seconds
setTimeout(function() {
for (let i = 0; i < blueLights.length; i++) {
blueLights[i].style.filter = "grayscale(100%)"
}
}, 3000)
}, 3000) // total interval for switching lights
}
switchLights()