CODEWITHSUNDEEP
javascriptfirefoxdownloadblob
Johncl
Johncl

Reputation: 1231

Blob createObjectURL download not working in Firefox (but works when debugging)

I have an odd problem, the function below is one I created based on what i found on the net about creating a Blob in the client on the fly with some binary data in (passed as an array) and being able to download that. This works brilliantly in Chrome, but doesn't do anything in Firefox - UNLESS I debug and step through the code. Yes, oddly, if I create a break point inside the function and step through it, the a.click() will bring up the download window!

function downloadFile(filename, data) {

    var a = document.createElement('a');
    a.style = "display: none";  
    var blob = new Blob(data, {type: "application/octet-stream"});
    var url = window.URL.createObjectURL(blob);
    a.href = url;
    a.download = filename;
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    window.URL.revokeObjectURL(url);    
}

Can anyone help me? This was tested using Firefox 38.0.5.

Upvotes: 62

Views: 73106

Answers (3)

Tomek
Tomek

Reputation: 558

The above didn't solve the issue for me. But this one did instead:
Programmatical click on <a>-tag not working in Firefox
It was a problem with the triggering click event, not premature removal of the resource.

Upvotes: 12

Azad
Azad

Reputation: 5264

this solution works for me in bot chrome and firefox for existing anchor element to download binary file

window.URL = window.URL || window.webkitURL;

var blob = new Blob([new Uint8Array(binStream)], {type: "octet/stream"});

var link = document.getElementById("link");
link.href = window.URL.createObjectURL(blob);

Upvotes: 4

Musa
Musa

Reputation: 97672

You're probably removing the resource too soon, try delaying it

    ...
    a.click();
    setTimeout(function(){
        document.body.removeChild(a);
        window.URL.revokeObjectURL(url);  
    }, 100);  
}

Upvotes: 92

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