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- //download.js v4.2, by dandavis; 2008-2016. [MIT] see http://danml.com/download.html for tests/usage
- // v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime
- // v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs
- // v3 added dataURL and Blob Input, bind-toggle arity, and legacy dataURL fallback was improved with force-download mime and base64 support. 3.1 improved safari handling.
- // v4 adds AMD/UMD, commonJS, and plain browser support
- // v4.1 adds url download capability via solo URL argument (same domain/CORS only)
- // v4.2 adds semantic variable names, long (over 2MB) dataURL support, and hidden by default temp anchors
- // https://github.com/rndme/download
- export default function download(data, strFileName, strMimeType) {
- let self = window, // this script is only for browsers anyway...
- defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads
- mimeType = strMimeType || defaultMime,
- payload = data,
- url = !strFileName && !strMimeType && payload,
- anchor = document.createElement("a"),
- toString = function(a) { return String(a); },
- myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),
- fileName = strFileName || "download",
- blob,
- reader;
- myBlob = myBlob.call ? myBlob.bind(self) : Blob;
- if (String(this) === "true") { //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
- payload = [payload, mimeType];
- mimeType = payload[0];
- payload = payload[1];
- }
- if (url && url.length < 2048) { // if no filename and no mime, assume a url was passed as the only argument
- fileName = url.split("/").pop().split("?")[0];
- anchor.href = url; // assign href prop to temp anchor
- if (anchor.href.indexOf(url) !== -1) { // if the browser determines that it's a potentially valid url path:
- let ajax = new XMLHttpRequest();
- ajax.open("GET", url, true);
- ajax.responseType = 'blob';
- ajax.onload = function(e) {
- download(e.target.response, fileName, defaultMime);
- };
- setTimeout(function() { ajax.send(); }, 0); // allows setting custom ajax headers using the return:
- return ajax;
- } // end if valid url?
- } // end if url?
- //go ahead and download dataURLs right away
- if (/^data:([\w+-]+\/[\w+.-]+)?[,;]/.test(payload)) {
- if (payload.length > (1024 * 1024 * 1.999) && myBlob !== toString) {
- payload = dataUrlToBlob(payload);
- mimeType = payload.type || defaultMime;
- } else {
- return navigator.msSaveBlob ? // IE10 can't do a[download], only Blobs:
- navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :
- saver(payload); // everyone else can save dataURLs un-processed
- }
- } else { //not data url, is it a string with special needs?
- if (/([\x80-\xff])/.test(payload)) {
- let i = 0,
- tempUiArr = new Uint8Array(payload.length),
- mx = tempUiArr.length;
- for (i; i < mx; ++i) tempUiArr[i] = payload.charCodeAt(i);
- payload = new myBlob([tempUiArr], { type: mimeType });
- }
- }
- blob = payload instanceof myBlob ?
- payload :
- new myBlob([payload], { type: mimeType });
- function dataUrlToBlob(strUrl) {
- let parts = strUrl.split(/[:;,]/),
- type = parts[1],
- decoder = parts[2] == "base64" ? atob : decodeURIComponent,
- binData = decoder(parts.pop()),
- mx = binData.length,
- i = 0,
- uiArr = new Uint8Array(mx);
- for (i; i < mx; ++i) uiArr[i] = binData.charCodeAt(i);
- return new myBlob([uiArr], { type: type });
- }
- function saver(url, winMode) {
- if ('download' in anchor) { //html5 A[download]
- anchor.href = url;
- anchor.setAttribute("download", fileName);
- anchor.className = "download-js-link";
- anchor.innerHTML = "downloading...";
- anchor.style.display = "none";
- document.body.appendChild(anchor);
- setTimeout(function() {
- anchor.click();
- document.body.removeChild(anchor);
- if (winMode === true) { setTimeout(function() { self.URL.revokeObjectURL(anchor.href); }, 250); }
- }, 66);
- return true;
- }
- // handle non-a[download] safari as best we can:
- if (/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {
- if (/^data:/.test(url)) url = "data:" + url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
- if (!window.open(url)) { // popup blocked, offer direct download:
- if (confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")) { location.href = url; }
- }
- return true;
- }
- //do iframe dataURL download (old ch+FF):
- let f = document.createElement("iframe");
- document.body.appendChild(f);
- if (!winMode && /^data:/.test(url)) { // force a mime that will download:
- url = "data:" + url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
- }
- f.src = url;
- setTimeout(function() { document.body.removeChild(f); }, 333);
- } //end saver
- if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
- return navigator.msSaveBlob(blob, fileName);
- }
- if (self.URL) { // simple fast and modern way using Blob and URL:
- saver(self.URL.createObjectURL(blob), true);
- } else {
- // handle non-Blob()+non-URL browsers:
- if (typeof blob === "string" || blob.constructor === toString) {
- try {
- return saver("data:" + mimeType + ";base64," + self.btoa(blob));
- } catch (y) {
- return saver("data:" + mimeType + "," + encodeURIComponent(blob));
- }
- }
- // Blob but not URL support:
- reader = new FileReader();
- reader.onload = function(e) {
- saver(this.result);
- };
- reader.readAsDataURL(blob);
- }
- return true;
- }; /* end download() */
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