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_preview.js
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_preview.js
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const iframe = document.querySelector('iframe')
const textarea = document.querySelector('textarea')
const loadPreview = (code) => {
const html = code.replace(/\n/g, '').match(/<html>(.+?)<\/html>/gm) || []
const script = code
.replace(/<\/script>/g, '')
.replace(/'wavesurfer.js'/g, `'../dist/wavesurfer.esm.js'`)
.replace(/'wavesurfer.js/g, `'..`)
.replace(/\.esm\.js/g, '.js')
const isBabel = script.includes('@babel')
// Start of iframe template
iframe.srcdoc = `
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>wavesurfer.js examples</title>
<style>
html {
font-family: sans-serif;
}
body {
margin: 0;
padding: 1rem;
}
@media (prefers-color-scheme: dark) {
body {
background: #333;
color: #eee;
}
a {
color: #fff;
}
}
input {
vertical-align: middle;
}
</style>
</head>
<body>
${html.join('')}
<script type="${isBabel ? 'text/babel' : 'module'}" data-type="module">
${script}
</script>
</body>
</html>
`
// End of iframe template
}
const openExample = (url) => {
fetch(`/examples/${url}`, {
cache: 'no-cache',
})
.then((res) => res.text())
.then((text) => {
loadPreview(text)
textarea.value = text
})
}
let delay
document.querySelector('textarea').addEventListener('input', (e) => {
if (delay) clearTimeout(delay)
delay = setTimeout(() => {
loadPreview(e.target.value)
}, 500)
})
const url = location.hash.slice(1) || 'basic.js'
openExample(url)
let active = document.querySelector(`aside a[href="#${url}"]`)
if (active) active.classList.add('active')
document.querySelectorAll('aside a').forEach((link) => {
link.addEventListener('click', () => {
const url = link.hash.slice(1)
openExample(url)
if (active) active.classList.remove('active')
active = link
active.classList.add('active')
})
})