File download a byte array as a file in javascript / Extjs

Question

In my Ext Js solution I am calling a service which is returning this JSON format

{\"success\":true,\"filename\":\"spreadsheet.xlsx\",\"file\":[80,75,3,4,20,         


        

Answer 1

I had to convert the file into a Uint8Array before passing it to the Blob

var arr = data.file;
var byteArray = new Uint8Array(arr);
var a = window.document.createElement('a');

a.href = window.URL.createObjectURL(new Blob([byteArray], { type: 'application/octet-stream' }));
a.download = data.filename;

// Append anchor to body.
document.body.appendChild(a)
a.click();


// Remove anchor from body
document.body.removeChild(a)

Reading this answer helped a lot https://stackoverflow.com/a/16245768/1016439