How do I build a pdf file/blob from byte[] via a AJAX / REST call [Answered]RSS

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  EddieFlo

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  How do I build a pdf file/blob from byte[] via a AJAX / REST call

  Mar 01, 2016 08:51 PM|EddieFlo|LINK

  Question: I have WebMethod as illustrated below that should return a byte[]. The byte[] then needs to be retrieved by AJAX call and display the pdf file.
  [WebMethod]
  public static byte[] GeneratePDF()
  {
      var pdfPath = Path.Combine(System.Web.Hosting.HostingEnvironment.MapPath("~/PDFTemplates/W9.pdf"));
      PdfReader pdfReader = new PdfReader(pdfPath);
      MemoryStream stream = new MemoryStream();
      PdfStamper stamper = new PdfStamper(pdfReader, stream);
   
      pdfReader.Close();
      stamper.Close();
      stream.Flush();
      stream.Close();
      
      byte[] bytes = System.IO.File.ReadAllBytes(pdfPath);
      
      return bytes;            
  }
  Note: for AJAX call, I have following AngularJS code
  function GeneratePDF() {
  	$http.post('/Default.aspx/GeneratePDF', '', { responseType: 'arraybuffer' }).then(function (response) {
  
  		var blob = new Blob([new Uint8Array(response.data)], { type: 'application/pdf' });
  		$scope.url = (window.URL || window.webkitURL).createObjectURL(blob);
  		window.open($scope.url);		
  	});
  }
  And html anchor below for downloading pdf file

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  sw-ing

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  194 Posts

  Re: How do I build a pdf file/blob from byte[] via a AJAX / REST call

  Mar 02, 2016 06:03 AM|sw-ing|LINK

  hi,

  i'd like to know if ajax post request could be sent to call web method. besides, you could refer to this link to download and save files.

  http://www.html5rocks.com/en/tutorials/file/xhr2/

• • Reply
  Weibo Zhang

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  Re: How do I build a pdf file/blob from byte[] via a AJAX / REST call

  Apr 01, 2016 08:05 AM|Weibo Zhang|LINK

  Hi EddieFlo,

  According to your above description, I think you want to download a PDF file through the ajax and web service. The following link provides a demo about using Iframe to achieve it that you could have a look.

  http://stackoverflow.com/questions/12601180/how-to-download-file-via-jquery-ajax-and-c-sharp

  In link provides a demo about first build the contents of PDF through ajax calling web service during page loading and then use Server button to download the PDF, maybe you could have a look.

  http://www.aspforums.net/Threads/482057/Export-GridView-populated-using-jQuery-AJAX-to-PDF-using-iTextSharp-in-ASPNet/

  Besides, the following article shows a demo about using Ajax and a generic handler to do it and you could have a try if you need.

  http://growingtech.blogspot.jp/2012/11/export-pdf-using-jquery-and-generic.html

  Best Regards,

  Albert Zhang