Properly Create and Serve PDF Blob via HTML5 File and URL APIs

Ok, Let's say I have document data stored somewhere, let's arbitrarily take this pdf.

Issue #1. What I want to do is make an AJAX call to this URL (because I need to pass some authentication headers and it is cross domain). Then take the returned data, create a blob url for it, append an iFrame to the DOM, and direct the src to the blob url.

Currently my code looks like this:

   var file = new Blob([data], {type:'application/pdf'}),
       url = URL.createObjectURL(file),
       _iFrame = document.createElement('iframe');
      _iFrame.setAttribute('src', url);
      _iFrame.setAttribute('style', 'visibility:hidden;');

Unfortunately, I am getting a 'Failed to Render PDF' in the iFrame.

Issue #2. I'd like this to result in a file download prompt. Not sure how to guarantee this given that PDF's will naturally just display in the iFrame.



jQuery.ajax does not currently support blobs, see this bug report #7248 which is closed as wontfix.

However it's easy to do XHR for blobs without jQuery:

var xhr = new XMLHttpRequest();'GET', '', true);
xhr.responseType = 'blob';

xhr.onload = function(e) {
  if (this.status == 200) {
    // Note: .response instead of .responseText
    var blob = new Blob([this.response], {type: 'application/pdf'}),
        url = URL.createObjectURL(blob),
        _iFrame = document.createElement('iframe');

    _iFrame.setAttribute('src', url);
    _iFrame.setAttribute('style', 'visibility:hidden;');


Shamelessly copied from HTML5rocks.

If jQuery did support the Blob type, it could be as simple as:


I have used @Ciantic answer to adapt my answer. I have avoided using iframe obj and the user can download the file directly from the page.

var link = '';
$("body").addClass("loading"); // adding the loading spinner class

var xhr = new XMLHttpRequest();'GET',link,true);
xhr.responseType = 'blob';

        xhr.onload = function(e){
                 if (this.status == 200) {
                    var a = document.createElement('a');
                    var url = window.URL.createObjectURL(new Blob([this.response], {type: 'application/pdf'}));
                    a.href = url;
           = 'report.pdf';
                    $('body').removeClass("loading"); //removing the loading spinner class
                      $('body').removeClass("loading") //removing the loading spinner class
                      alert('Download failed...!  Please Try again!!!');
var src_url = your url here;
var contentDisposition = 'AlwaysInline';
var src_new = src_url.replace(/(ContentDisposition=).*?(&)/, '$1' + contentDisposition + '$2');

By doing this you will be able to view pdf instead of downloading it,

Header ContentDisposition should be 'AlwaysInline' then only it displays your file instead of downloading it.


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