download.js
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//download.js v3.0, by dandavis; 2008-2014. [CCBY2] 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
// data can be a string, Blob, File, or dataURL
function download(data, strFileName, strMimeType) {
var self = window, // this script is only for browsers anyway...
u = "application/octet-stream", // this default mime also triggers iframe downloads
m = strMimeType || u,
x = data,
D = document,
a = D.createElement("a"),
z = function(a){return String(a);},
B = self.Blob || self.MozBlob || self.WebKitBlob || z,
BB = self.MSBlobBuilder || self.WebKitBlobBuilder || self.BlobBuilder,
fn = strFileName || "download",
blob,
b,
ua,
fr;
//if(typeof B.bind === 'function' ){ B=B.bind(self); }
if(String(this)==="true"){ //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
x=[x, m];
m=x[0];
x=x[1];
}
//go ahead and download dataURLs right away
if(String(x).match(/^data\:[\w+\-]+\/[\w+\-]+[,;]/)){
return navigator.msSaveBlob ? // IE10 can't do a[download], only Blobs:
navigator.msSaveBlob(d2b(x), fn) :
saver(x) ; // everyone else can save dataURLs un-processed
}//end if dataURL passed?
try{
blob = x instanceof B ?
x :
new B([x], {type: m}) ;
}catch(y){
if(BB){
b = new BB();
b.append([x]);
blob = b.getBlob(m); // the blob
}
}
function d2b(u) {
var p= u.split(/[:;,]/),
t= p[1],
dec= p[2] == "base64" ? atob : decodeURIComponent,
bin= dec(p.pop()),
mx= bin.length,
i= 0,
uia= new Uint8Array(mx);
for(i;i<mx;++i) uia[i]= bin.charCodeAt(i);
return new B([uia], {type: t});
}
function saver(url, winMode){
if ('download' in a) { //html5 A[download]
a.href = url;
a.setAttribute("download", fn);
a.innerHTML = "downloading...";
D.body.appendChild(a);
setTimeout(function() {
a.click();
D.body.removeChild(a);
if(winMode===true){setTimeout(function(){ self.URL.revokeObjectURL(a.href);}, 250 );}
}, 66);
return true;
}
//do iframe dataURL download (old ch+FF):
var f = D.createElement("iframe");
D.body.appendChild(f);
if(!winMode){ // force a mime that will download:
url="data:"+url.replace(/^data:([\w\/\-\+]+)/, u);
}
f.src = url;
setTimeout(function(){ D.body.removeChild(f); }, 333);
}//end saver
if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
return navigator.msSaveBlob(blob, fn);
}
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===z ){
try{
return saver( "data:" + m + ";base64," + self.btoa(blob) );
}catch(y){
return saver( "data:" + m + "," + encodeURIComponent(blob) );
}
}
// Blob but not URL:
fr=new FileReader();
fr.onload=function(e){
saver(this.result);
};
fr.readAsDataURL(blob);
}
return true;
} /* end download() */