Download blobs locally using Safari

问题:

I'm trying to find a cross browser way to store data locally in HTML5. I have generated a chunk of data in a Blob (see MDN). Now I want to move this Blob to the actual filesystem and save it locally. I've found the following ways to achieve this;

• Use the <a download> attribute. This works only in Chrome currently.
• Microsoft introduces a saveAs function in IE 10 which will achieve this.
• Open the Blob URL in the browser and save it that way.

None of these seems to work in Safari though. While (1) works in Chrome, (2) in IE and (3) in Firefox no one works in Safari 6. The download attribute is not yet implemented and when trying to open a blob using the URL Safari complains that URLs starting with blob: are not valid URLs.

There is a good script that encapsulates (1) and (3) called FileSaver.js but that does not work using the latest Safari version.

Is there a way to save Blobs locally in a cross browser fashion?

回答1:

FileSaver.js has beed updated recently and it works on IE10, Safari5+ etc.

See: https://github.com/eligrey/FileSaver.js/#supported-browsers

回答2:

The file name sucks, but this works for me in Safari 8:

        window.open('data:attachment/csv;charset=utf-8,' + encodeURI(csvString));

UPDATE: No longer working in Safari 9.x

回答3:

The only solution that I have come up with is making a data: url instead. For me this looks like:

window.open("data:image/svg+xml," + encodeURIComponent(currentSVGString));

回答4:

Have you read this article? http://updates.html5rocks.com/2012/06/Don-t-Build-Blobs-Construct-Them

Relating to http://caniuse.com/#search=blob, blobs are possible to use in safari.

You should consturct a servlet which delivers the blob via standard http:// url, so you can avoid using blob: url. Just make a request to that url and build your blob.

Afterwards you can save it in your filesystem or local storage.

回答5:

Here data is the array buffer data coming from response while making http rest call in js. This works in safari, however there might me some issue in filename as it comes to be untitled.

                                        var binary = '';
                                        var bytes = new Uint8Array( data );
                                        var len = bytes.byteLength;
                                        for (var i = 0; i < len; i++) {
                                            binary += String.fromCharCode( bytes[ i ] );
                                    }

                                    var base64 = "data:"+contentType+";base64,"+window.btoa( binary );
                                    var uri = encodeURI(base64);
                                    var anchor = document.createElement('a');
                                    document.body.appendChild(anchor);
                                    anchor.href = uri;
                                    anchor.download = fileName;
                                    anchor.click();
                                    document.body.removeChild(anchor);