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index.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>Cross-browser File Download</title>
<style>
section {
margin-top: 1em;
}
.support {
display: inline-block;
height: 1em;
width: 1em;
}
.support__success {
background-color: green;
}
.support__fail, #error {
background-color: red;
}
</style>
</head>
<body>
<section>
<p id="error"></p>
</section>
<script>
window.addEventListener('error', function (error) {
document.getElementById('error').textContent = (error.lineno || error.lineNumber) + ' ' + error.message
})
</script>
<h1>Cross-browser File Download</h1>
<form class="download">
<label>lyreco.3.9MB.pdf
<input type="radio" name="fileName" class="download--filename" value="lyreco.3.9MB.pdf" checked>
</label>
<label>example.48K.pdf
<input type="radio" name="fileName" class="download--filename" value="example.48K.pdf">
</label>
<hr>
<input type="submit" class="download--button" value="Save PDF">
<a href="itms-bookss://dotnetcarpenter.github.io/FileReader_Chrome/example.48K.pdf">iBooks</a>
<a href="itms-bookss://example.48K.pdf">iBooks</a>
</form>
<section>
Your browser support:
<ol>
<li>navigator.msSaveBlob: <span class="support" data-test-name="msSaveBlob"></span></li>
<li>URL.createObjectURL: <span class="support" data-test-name="createObjectURL"></span></li>
<li>FileReader::readAsDataURL: <span class="support" data-test-name="readAsDataURL"></span></li>
<li>a:download: <span class="support" data-test-name="download"></span></li>
</ol>
</section>
<script>
Array.prototype.forEach.call(
document.querySelectorAll('.support'),
function (element) {
test(element, element.dataset.testName)
})
function test (element, testName) {
var success = false
switch (testName) {
case 'createObjectURL':
var userAgent = navigator.userAgent
success = URL && URL.createObjectURL
&& userAgent.indexOf('Chrom') !== -1 && userAgent.indexOf('Safari') !== -1
break
case 'readAsDataURL':
var reader = new FileReader
success = reader.readAsDataURL
break
case 'msSaveBlob':
success = navigator.msSaveBlob
break
case 'download':
var a = document.createElement("a")
a.download = 'foo'
success = a.hasAttribute('download')
break
}
if (success) element.classList.add('support__success')
else element.classList.add('support__fail')
}
</script>
<script src="https://unpkg.com/promise-polyfill"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script>
'use strict'
var form = document.querySelector('.download')
var submitHandler = partial(handler, downloadFile, form)
var getBlob = partial(dot, 'data')
form.addEventListener('submit', submitHandler)
function handler (f, form, event) {
event.preventDefault()
f(form.querySelector('.download--filename:checked').value)
}
function downloadFile (filePath) {
axios.get(filePath, { responseType: 'blob' })
.then(getBlob)
.then(function (blob) {
var fileName = basename(filePath)
var msSaveBlobOr = partial(
iif,
function () { return navigator.msSaveBlob },
function (blob) { navigator.msSaveBlob(blob, fileName) }) // IE11 and Edge 12-18
var saveObjectUrlOrDataUrl = iif(
function () {
var userAgent = navigator.userAgent
return URL && URL.createObjectURL
&& userAgent.indexOf('Chrom') !== -1 && userAgent.indexOf('Safari') !== -1
},
function (readerBlob) { // Chrome and Firefox
var blob = readerBlob.blob
var url = URL.createObjectURL(blob)
saveFile(url, fileName)
URL.revokeObjectURL(url)
},
function (readerBlob) { // Safari
var reader = readerBlob.reader
var url = reader.result
saveFile(url, fileName)
}
)
var save = msSaveBlobOr(function (blob) {
var reader = new FileReader
reader.onloadend = saveObjectUrlOrDataUrl({
reader: reader,
blob: blob,
fileName: fileName
})
reader.readAsDataURL(blob)
})
save(blob)
})
}
function saveFile (file, fileName) {
console.log(file)
var a = document.createElement("a")
a.href = file
a.style.display = 'none'
a.setAttribute('download', 'fileName')
a.download = fileName
document.body.appendChild(a)
a.click()
a.parentNode.removeChild(a)
}
function partial (f) {
var xs = Array.prototype.slice.call(arguments, 1)
var x = xs.shift()
return x == null
? f
: partial.apply(null, [f.bind(null, x)].concat(xs))
}
function dot (property, object) {
return object[property]
}
function iif (expression, truePart, falsePart) {
return function (argument) {
return expression (argument) ? truePart (argument) : falsePart (argument)
}
}
function basename (path) {
var match = path.match(/\/?([^\/]+)$/)
return match ? match[1] : ''
}
/* #region old
if (navigator.msSaveBlob) { // IE11 and Edge 17-
navigator.msSaveBlob(blob, fileName)
} else { // every other browser
var reader = new FileReader()
reader.onloadend = () => {
var url
switch (type) {
case 'createObjectURL':
url = window.URL.createObjectURL(blob)
break
case 'readAsDataURL':
default:
url = reader.result;
}
download(url, fileName)
if (type === 'createObjectURL') {
window.URL.revokeObjectURL(url)
}
}
if (type === 'readAsText') {
reader.readAsText(blob)
} else {
reader.readAsDataURL(blob)
}
}
#endregion */
</script>
</body>
</html>