Get PDF from URL, create Object URL, then download/open in a browser window

do_the_things_v1.js

(function() {

  return {

    events: {
      'app.activated':'init'
    },

    init: function() {
      var self = this;
      this.switchTo('main');
      var req = new XMLHttpRequest();
      var pdf_url = this.assetURL("test2.pdf");
      req.open("GET", pdf_url, true);
      req.responseType = "blob";
      console.log(req);

      req.onload = function (event) {
        console.log("loaded");
        var blob = req.response;
        var link = document.createElement('a');
        link.href = URL.createObjectURL(blob);
        link.download = "name_of_file.pdf";
        link.text = "Get PDF";
        link.target = "_blank";
        self.$("#appwrap").append(link);
        self.$("#appwrap a").click();
      };

      req.send();
    }
  };

}());