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createObjectURL.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Chrome FileReader Network Error</title>
</head>
<body>
<form>
<label>utf8.pdf
<input type="radio" name="fileName" value="utf8.pdf" checked>
</label>
<label>example.pdf
<input type="radio" name="fileName" value="example.pdf">
</label>
<hr>
<button id="FileReader">Save PDF for Safari iOS + Firefox</button>
<button id="createObjectURL">Save PDF for Chrome + Firefox</button>
</form>
<script>
'use strict'
document.getElementById('FileReader').onclick = download('FileReader')
document.getElementById('createObjectURL').onclick = download('createObjectURL')
function download (type) {
return event => {
event.preventDefault()
const fileName = document.querySelector('input:checked').value
fetch(fileName, {
method: 'get',
})
.then(response => response.blob())
.then(blob => {
const reader = new FileReader()
reader.onloadend = () => {
const a = document.createElement("a")
let objectUrl
if (type === 'createObjectURL') {
objectUrl = window.URL.createObjectURL(blob)
a.href = objectUrl
} else {
a.href = reader.result
}
a.style.display = 'none'
a.download = fileName
document.body.appendChild(a)
a.click()
if (type === 'createObjectURL') {
window.URL.revokeObjectURL(objectUrl)
} else {
}
a.parentNode.removeChild(a)
}
reader.readAsDataURL(blob)
})
}
}
</script>
</body>
</html>