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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<!--
 Example HTML/javascript file that display the
 content of a RRD archive file in a graph
 using the Flot libraries
 Part of the javascriptRRD package
 Copyright (c) 2009 Frank Wuerthwein, fkw@ucsd.edu

 Original repository: http://javascriptrrd.sourceforge.net/
 
 MIT License [http://www.opensource.org/licenses/mit-license.php]

-->

<!--
 This page requires Flot.

 Repository: http://code.google.com/p/flot/

-->

<html>
  
    <script type="text/javascript" src="../lib/binaryXHR.js"></script>
    <script type="text/javascript" src="../lib/rrdFile.js"></script>
    <script type="text/javascript" src="../lib/rrdFlotSupport.js"></script>
    <script type="text/javascript" src="../lib/rrdFlot.js"></script>

    <script type="text/javascript" src="../../flot/jquery.js"></script>
    <script type="text/javascript" src="../../flot/jquery.flot.js"></script>
  <head>
    <title>RRD Graphs with Flot</title>
  </head>

  <body>
    <h1 id="title">RRD Graphs with Flot</h1>

    RRD URL:
    <input type="text" id="input_fname" value="example1.rrd"
           onchange="fname_update()">
     <button onclick="fname_update()">Update</button>
    <hr>

    <table id="infotable" border=1>
        <tr><td colspan="21"><b>Javascript needed for this page to work</b></td></tr>
	<tr><td><b>RRD file</b></td><td id="fname" colspan="5">None</td></tr>
    </table>

    <div id="mygraph"></div>

    <script type="text/javascript">

      // Remove the Javascript warning
      document.getElementById("infotable").deleteRow(0);

      // fname and rrd_data are the global variable used by all the functions below
      fname=document.getElementById("input_fname").value;
      rrd_data=undefined;

      // This function updates the Web Page with the data from the RRD archive header
      // when a new file is selected
      function update_fname() {
        // Update DS info
        var nrDSs=rrd_data.getNrDSs()

        // Finally, update the file name and enable the update button
        document.getElementById("fname").firstChild.data=fname;

        // the rrdFlot object creates and handles the graph
        var f=new rrdFlot("mygraph",rrd_data,null);
      }

      // This is the callback function that,
      // given a binary file object,
      // verifies that it is a valid RRD archive
      // and performs the update of the Web page
      function update_fname_handler(bf) {
          var i_rrd_data=undefined;
          try {
            var i_rrd_data=new RRDFile(bf);            
          } catch(err) {
            alert("File "+fname+" is not a valid RRD archive!");
          }
          if (i_rrd_data!=undefined) {
            rrd_data=i_rrd_data;
            update_fname()
          }
      }

      // this function is invoked when the RRD file name changes
      function fname_update() {
        fname=document.getElementById("input_fname").value;
        try {
          FetchBinaryURLAsync(fname,update_fname_handler);
        } catch (err) {
           alert("Failed loading "+fname+"\n"+err);
        }
      }

    </script>
  </body>
</html>