//download.js v4.0, by dandavis; 2008-2015. [CCBY2] see http://danml.com/download.html for tests/usage
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// v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime
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// v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs
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// 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.
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// v4 adds AMD/UMD, commonJS, and plain browser support
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// https://github.com/rndme/download
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(function (root, factory) {
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if (typeof define === 'function' && define.amd) {
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// AMD. Register as an anonymous module.
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define([], factory);
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} else if (typeof exports === 'object') {
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// Node. Does not work with strict CommonJS, but
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// only CommonJS-like environments that support module.exports,
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// like Node.
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module.exports = factory();
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} else {
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// Browser globals (root is window)
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root.download = factory();
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}
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}(this, function () {
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return function download(data, strFileName, strMimeType) {
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var self = window, // this script is only for browsers anyway...
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u = "application/octet-stream", // this default mime also triggers iframe downloads
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m = strMimeType || u,
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x = data,
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D = document,
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a = D.createElement("a"),
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z = function(a){return String(a);},
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B = (self.Blob || self.MozBlob || self.WebKitBlob || z);
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B=B.call ? B.bind(self) : Blob ;
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var fn = strFileName || "download",
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blob,
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fr;
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if(String(this)==="true"){ //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
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x=[x, m];
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m=x[0];
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x=x[1];
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}
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//go ahead and download dataURLs right away
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if(String(x).match(/^data\:[\w+\-]+\/[\w+\-]+[,;]/)){
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return navigator.msSaveBlob ? // IE10 can't do a[download], only Blobs:
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navigator.msSaveBlob(d2b(x), fn) :
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saver(x) ; // everyone else can save dataURLs un-processed
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}//end if dataURL passed?
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blob = x instanceof B ?
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x :
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new B([x], {type: m}) ;
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function d2b(u) {
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var p= u.split(/[:;,]/),
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t= p[1],
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dec= p[2] == "base64" ? atob : decodeURIComponent,
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bin= dec(p.pop()),
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mx= bin.length,
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i= 0,
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uia= new Uint8Array(mx);
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for(i;i<mx;++i) uia[i]= bin.charCodeAt(i);
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return new B([uia], {type: t});
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}
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function saver(url, winMode){
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if ('download' in a) { //html5 A[download]
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//change base64 to blob, to aviod chrome crash with large file
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if(String(url).match(/^data\:[\w+\-]+\/[\w+\-]+[,;]/)){
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// atob to base64_decode the data-URI
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var image_data = atob(url.split(',')[1]);
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// Use typed arrays to convert the binary data to a Blob
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var arraybuffer = new ArrayBuffer(image_data.length);
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var view = new Uint8Array(arraybuffer);
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for (var i=0; i<image_data.length; i++) {
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view[i] = image_data.charCodeAt(i) & 0xff;
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}
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try {
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// This is the recommended method:
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var blob = new Blob([arraybuffer], {type: 'application/octet-stream'});
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} catch (e) {
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// The BlobBuilder API has been deprecated in favour of Blob, but older
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// browsers don't know about the Blob constructor
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// IE10 also supports BlobBuilder, but since the `Blob` constructor
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// also works, there's no need to add `MSBlobBuilder`.
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var bb = new (window.WebKitBlobBuilder || window.MozBlobBuilder);
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bb.append(arraybuffer);
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var blob = bb.getBlob('application/octet-stream'); // <-- Here's the Blob
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}
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// Use the URL object to create a temporary URL
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url = (window.webkitURL || window.URL).createObjectURL(blob);
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}
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a.href = url;
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a.setAttribute("download", fn);
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a.innerHTML = "downloading...";
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D.body.appendChild(a);
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setTimeout(function() {
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a.click();
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D.body.removeChild(a);
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if(winMode===true){setTimeout(function(){ self.URL.revokeObjectURL(a.href);}, 250 );}
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}, 66);
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return true;
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}
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if(typeof safari !=="undefined" ){ // handle non-a[download] safari as best we can:
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url="data:"+url.replace(/^data:([\w\/\-\+]+)/, u);
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if(!window.open(url)){ // popup blocked, offer direct download:
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if(confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")){ location.href=url; }
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}
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return true;
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}
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//do iframe dataURL download (old ch+FF):
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var f = D.createElement("iframe");
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D.body.appendChild(f);
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if(!winMode){ // force a mime that will download:
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url="data:"+url.replace(/^data:([\w\/\-\+]+)/, u);
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}
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f.src=url;
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setTimeout(function(){ D.body.removeChild(f); }, 333);
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}//end saver
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if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
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return navigator.msSaveBlob(blob, fn);
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}
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if(self.URL){ // simple fast and modern way using Blob and URL:
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saver(self.URL.createObjectURL(blob), true);
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}else{
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// handle non-Blob()+non-URL browsers:
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if(typeof blob === "string" || blob.constructor===z ){
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try{
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return saver( "data:" + m + ";base64," + self.btoa(blob) );
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}catch(y){
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return saver( "data:" + m + "," + encodeURIComponent(blob) );
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}
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}
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// Blob but not URL:
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fr=new FileReader();
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fr.onload=function(e){
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saver(this.result);
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};
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fr.readAsDataURL(blob);
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}
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return true;
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}; /* end download() */
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}));
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