fabien7474 fabien7474 - 2 months ago 45
iOS Question

How to display PDF (Blob) on iOS sent from my angularjs app

My Angular 1.5 application connect to a Java/Tomcat/Spring backend server via REST.

One REST service generates PDF and send it to the client. It works fine on DEsktop browsers (FF, Chrome at least) but I cannot see the PDF content on iOS (ipad for instance) whatever the browser I am using (Chrome, Safari..)

Here is the Angular Code :

$http.get("/displayPdf", {responseType: 'arraybuffer', params: {id: 1}}).
success(function(data) {
var blob = new Blob([data], {type 'application/pdf'});
var objectUrl = window.URL.createObjectURL(blob);
window.open(objectUrl);
}
);


The Spring/Jax-RS code is :

@GET
@Path("displayPdf")
@Produces("application/pdf")
Response displayPdf(@QueryParam("id") Long id) {
byte[] bytes = service.generatePdf();
return javax.ws.rs.core.Response.ok().
entity(bytes).
header("Content-Type", "pdf").
header("Content-Disposition", "attachment; filename='test.pdf'").
build();
}


I have done my research here for instance(AngularJS: Display blob (.pdf) in an angular app) but could not find an appropriate solution.

So please, do you know what should I do to display the generated PDF to my iPad/iPhone end-users ?

Thanks a lot

Answer

None of the solutions proposed above did work for me.

The main issue comes from URL that wasn't retrieved correctly in iOS. The following code do the correct work :

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

Also even with this, it did not work on Chrome iOS, neither Opera iOS...so after digging the internet and inspired with the following questions :

... I finally ended up with the follwoing code (working on all iOS browsers except FF on iOS) :

if (window.navigator.msSaveOrOpenBlob) { //IE 11+
  window.navigator.msSaveOrOpenBlob(blob, "my.pdf");
} else if (userAgent.match('FxiOS')) { //FF iOS
  alert("Cannot display on FF iOS");
}
} else if (userAgent.match('CriOS')) { //Chrome iOS
  var reader = new FileReader();
  reader.onloadend = function () { $window.open(reader.result);};
  reader.readAsDataURL(blob);
} else if (userAgent.match(/iPad/i) || userAgent.match(/iPhone/i)) { //Safari & Opera iOS
  var url = $window.URL.createObjectURL(blob);
  window.location.href = url;
}