Download base64 data using javascript | IE11 [duplicate]

Answer 1

Follow these steps to download a Word document from .NET Web API to ajax.

1. Convert a file to base64 format (this is just 2 lines of code in C#)
2. Return base64 string to front end.

3. Convert base64 string to blob using below function.

   base64toBlob = function (base64Data, contentType) {
       contentType = contentType || '';
       var sliceSize = 1024;
       var byteCharacters = atob(base64Data);
       //var byteCharacters = decodeURIComponent(escape(window.atob(base64Data)))
       var bytesLength = byteCharacters.length;
       var slicesCount = Math.ceil(bytesLength / sliceSize);
       var byteArrays = new Array(slicesCount);
   
       for (var sliceIndex = 0; sliceIndex < slicesCount; ++sliceIndex) {
           var begin = sliceIndex * sliceSize;
           var end = Math.min(begin + sliceSize, bytesLength);
   
           var bytes = new Array(end - begin);
           for (var offset = begin, i = 0 ; offset < end; ++i, ++offset) {
               bytes[i] = byteCharacters[offset].charCodeAt(0);
           }
           byteArrays[sliceIndex] = new Uint8Array(bytes);
       }
       return new Blob(byteArrays, { type: contentType });
   }
   

4. Render blob as a file. This has to be handled slightly differently in Chrome vs IE. For Chrome, we need to use link download option.

Please refer to this link for IE 11:
https://msdn.microsoft.com/en-us/library/hh779016(v=vs.85).aspx