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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Example / Demo</title>
<style>
#info {
position: fixed;
top: 0;
left: 0;
padding: 1rem;
color: white;
}
.section {
display: flex;
align-items: center;
justify-content: center;
color: white;
}
#a,
#b,
#c {
position: fixed;
padding: 1rem;
background-color: red;
border: none;
color: white;
transition: all .3s ease;
}
#a {
margin: 4rem;
top: 0;
right: 0;
}
#b {
margin: 3rem;
bottom: 0;
left: 0;
}
#c {
padding: 5rem;
top: calc(50vh - 100px);
right: 0;
width: 100px;
height: 100px;
}
.blue {
background-color: blue !important;
}
</style>
</head>
<body>
<button id="a">Button A</button>
<button id="b">Button B</button>
<button id="c">Button Middle</button>
<div id="info"></div>
<div class="section blue" style="height: 100vh; background-color: blue;">Section 0</div>
<div class="section red" style="height: 100vh; background-color: red;">Section 1</div>
<div class="section blue" style="height: 100vh; background-color: blue;">Section 2</div>
<div class="section red" style="height: 100vh; background-color: red;">Section 3</div>
<script type="module">
import Sections from './lib/Sections.js'
const a = document.getElementById('a')
const b = document.getElementById('b')
const c = document.getElementById('c')
new Sections()
.sectionStarted((section, direction) => {
document.getElementById('info').innerHTML = JSON.stringify(section) + ', ' + direction
})
.elementEvent(a, (eventType, direction, currentSection) => {
colorButton(a, eventType, direction, currentSection)
})
.elementEvent(b, (eventType, direction, currentSection) => {
colorButton(b, eventType, direction, currentSection)
})
.elementEvent(c, (eventType, direction, currentSection) => {
colorButton(c, eventType, direction, currentSection)
})
/**
* Change the color of the button based on the sections
*/
function colorButton(el, eventType, direction, currentSection) {
if (eventType === 'end') {
// revert on reverse !!
if (direction === 'up' && !currentSection.classList.includes('red') ||
direction === 'down' && currentSection.classList.includes('red')) {
el.classList.remove('blue')
} else if (direction === 'up' && currentSection.classList.includes('red') ||
direction === 'down' && !currentSection.classList.includes('red')) {
el.classList.add('blue')
}
} else if(eventType === 'middle') {
// change at middle
if (direction === 'down' && currentSection.classList.includes('red') ||
direction === 'up' && !currentSection.classList.includes('red')) {
el.classList.remove('blue')
} else if (direction === 'down' && !currentSection.classList.includes('red') ||
direction === 'up' && currentSection.classList.includes('red')) {
el.classList.add('blue')
}
}
}
</script>
</body>
</html>