Disable PDF download and print in ZK Framework

Question

I do not know how to disable PDF download and print in ZUML(ZK User Interface Markup Language). Do I need to embed a customized PDF viewer as I can only open PDF file by using Iframe tag in ZK and it uses browser pdf viewer.Therefore, it makes the task of disabling print and download pdf even harder.

score 0 · Answer 1 · answered Sep 02 '15 at 14:34

There are two other solution:

Convert the file to HTML, image, or any other format that can be directly viewed in the browser. This conversion can be on-the-fly using a server-side (written in Java in this case), or you can just pre-convert all files to a readable one.
The other approach, which is the best, is to use a Flash-based PDF viewer (such as http://flexpaper.devaldi.com/). This is easy, flexible and doesn't require writing server-side code. This approach is used by many Document-sharing sites (e.g. http://www.scribd.com/, http://www.slideshare.net/, http://www.docstoc.com/)

(For reference only, If you don't want disable download pdf file, there are few solutions: http://zkfiddle.org/sample/1dnhepc/11-PDF-viewer
http://zkfiddle.org/sample/3ojd4og/1-PDF-Viewer-in-ZK-using-Iframe#source-2 )

score 0 · Answer 2 · edited May 23 '17 at 11:51

After this question I discovered the existence of PDFObject, a simple javascript plugin to embed PDF documents inside a page. I've made a fiddle so you can see it in action.

index.zul

<?script type="text/javascript" src="http://pdfobject.com/scripts/pdfobject.js"?>
<zk>
  <script type='text/javascript'>
  function embedPDF(_url){
    var myPDF = new PDFObject({ 
      url: _url
    }).embed('pdfContainer');  
  }
</script>

  <vlayout apply="org.zkoss.bind.BindComposer" viewModel="@id('vm') @init('pkg$.TestVM')" xmlns:w="http://www.zkoss.org/2005/zk/client">
    <listbox model="@load(vm.pdfUrls)">
      <template name="model" var="url">
        <listitem>
          <listcell label="@load(url)" />
          <listcell>
            <button label="load" onClick="@command('loadPdf', url=url)" />
          </listcell>
        </listitem>
      </template>
    </listbox>
    <vlayout xmlns:n="native">
      <n:object id="pdfContainer"></n:object>
    </vlayout>
  </vlayout>
</zk>

TestVM.java

import org.zkoss.bind.annotation.AfterCompose;
import org.zkoss.bind.annotation.Command;
import org.zkoss.bind.annotation.BindingParam;
import java.util.List;
import java.util.ArrayList;
import org.zkoss.zk.ui.util.Clients;

public class TestVM {

    List<String> pdfUrls;

    @AfterCompose
    public void afterCompose() {
      pdfUrls = new ArrayList<String>();
      pdfUrls.add("http://www.pdf995.com/samples/pdf.pdf");
      pdfUrls.add("https://partners.adobe.com/public/developer/en/xml/AdobeXMLFormsSamples.pdf");
      pdfUrls.add("https://www.iscp.ie/sites/default/files/pdf-sample.pdf");
    }

  @Command
    public void loadPdf(@BindingParam("url")String url) {
      Clients.evalJavaScript("embedPDF('"+ url +"')");
    }

  public List<String> getPdfUrls() {
    return pdfUrls;
  }

}

Cheers, Alex

Disable PDF download and print in ZK Framework

2 Answers2