133 lines
3.4 KiB
JavaScript
133 lines
3.4 KiB
JavaScript
//download.js v3.0, by dandavis; 2008-2014. [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
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// data can be a string, Blob, File, or dataURL
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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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BB = self.MSBlobBuilder || self.WebKitBlobBuilder || self.BlobBuilder,
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fn = strFileName || "download",
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blob,
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b,
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ua,
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fr;
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//if(typeof B.bind === 'function' ){ B=B.bind(self); }
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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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try{
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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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}catch(y){
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if(BB){
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b = new BB();
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b.append([x]);
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blob = b.getBlob(m); // the blob
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}
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}
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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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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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//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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