javascript - Get the current page in PDF Java Web -

i need read current page number web application. have:

 <iframe id="mypdf" src="c:\test.pdf#page=5" style="width: 650px; height: 550px;" /> 

that open pdf on page = 5, , user can navigate page. then, when user click on button/link, need current index of page in pdf.

my users use acrobat reader, , cannot use plugins aren't adobe. can use javascript/java code.

thanks tami

i found out can use itext (free software) inject javascript pdf file , js in pdf send message container in html . message contain current page , , passed container each time page changed.

i use pdfobject.js pdfobject.min.js create pdfjs object catch message .

the code in java inject js pdf :

public string maddjs() {     inputstream vbreaderfile = null;      try     {         vbreaderfile = new fileinputstream("c:\\test.pdf");         pdfreader myreader = new pdfreader( vbreaderfile ); // throws ioexception         pdfstamper mystamper = new pdfstamper( myreader, new fileoutputstream("c:\\outtest.pdf") ); // throws ioe, documentexception         // add page-open script, 1 first page, not zero0         pdfaction jsaction = pdfaction.javascript ("app.alert('think again next time!');", mystamper.getwriter());         int pagenum = myreader.getnumberofpages();         for(int i=1 ; i<pagenum ; i++ )         {              jsaction = pdfaction.javascript (                      "this.disclosed=true;" +                      "if(this.hostcontainer){" +                      "var names = new array();names[0]=" + + ";" +                      "try{this.hostcontainer.postmessage(names);}" +                      "catch(e){app.alert(e.message); }"+                      "}", mystamper.getwriter());               mystamper.setpageaction( pdfwriter.page_open, jsaction, i);           }          mystamper.close(); // write out, throws documentexception, ioe         vpath = "c:\\outtest.pdf";      //  javascriptcontext.addjavascriptcall(facescontext.getcurrentinstance(), "mchangepdf('c:\\outtest.pdf');");      }     catch (exception e) {         e.printstacktrace();     }     return null;  } 

the html page :

 <h:body >          <ice:form id="myform">           <object id="mypdfobj" type="application/pdf" data="test.pdf#page=3"              height="550px" width="650px"></object>              <br/><ice:commandbutton onclick="test();" value="test" ></ice:commandbutton>              <ice:commandbutton action="#{pdftest.maddjs}" value="java" partialsubmit="false"></ice:commandbutton>               <div id="mydivpdf">               </div>         </ice:form>  </h:body> 

the js on html:

  <script type="text/javascript">       var pdf1;      var pdf2;       window.onload = function(evt)      {          createpdf();           createmessagehandler();      } 

function createpdf(){

 pdf1 = new pdfobject({       url: "test.pdf#page=3",       id: "mypdfobj",       width: "500px",       height: "300px"     });  pdf2 = pdf1.embed("myform:mydivpdf"); 

};

function createmessagehandler() {      var pdfobject = document.getelementbyid("mypdfobj");      if(pdfobject==null)         alert('e1');     pdfobject.messagehandler = {          onmessage: function(msg) {          //  alert('app');             alert( msg[0]);             },          onerror: function(error, msg) {              alert('error.message');          }      }  }     </script>