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path: root/src/examples/rrdMatrixFlot.html
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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>

    <!-- rrdFlotMatrix class needs the following four include files !-->
    <script type="text/javascript" src="../lib/rrdFlotSupport.js"></script>
    <script type="text/javascript" src="../lib/rrdFlotMatrix.js"></script>
    <script type="text/javascript" src="../../flot//jquery.js"></script>
    <script type="text/javascript" src="../../flot//jquery.flot.js"></script>
  <head>
    <title>Graph multiple RRDs with Flot</title>
  </head>

  <body>
     <h1 id="title">Graph multiple RRDs with Flot</h1>

     RRD group: <select id="input_fname" onchange="fname_update()"></select>
     <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);

      {
        var form_el=document.getElementById('input_fname');
        form_el.appendChild(new Option("example4","example4"));
       }
    
      // fname_group and rrd_data are the global variable used by all the functions below
      fname_group=null;
      rrd_data=[];

      // This function updates the Web Page with the data from the RRD archive header
      // when a new file is selected
      function update_fname() {
        // Finally, update the file name and enable the update button
        document.getElementById("fname").firstChild.data="Group "+fname_group;

        // the rrdFlot object creates and handles the graph
        var f=new rrdFlotMatrix("mygraph",[['s1',rrd_data[0]],['s2',rrd_data[1]],['s3',rrd_data[2]]],null,{legend:{position:'ne'}},{'s2':{checked:false},'s1':{title:'First rrd'}});
      }

      // 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,idx) {
          var i_rrd_data=undefined;
          try {
            var i_rrd_data=new RRDFile(bf);            
          } catch(err) {
            alert("File at idx "+idx+" is not a valid RRD archive!");
          }
          if (i_rrd_data!=undefined) {
            rrd_data[idx]=i_rrd_data;
          }
          if ((rrd_data[0]!=undefined) && (rrd_data[1]!=undefined) && (rrd_data[2]!=undefined)) {
            update_fname()
          }
      }

      // this function is invoked when the RRD file name changes
      function fname_update() {
        var base_el=document.getElementById("mygraph");
        // First clean up anything in the element
        while (base_el.lastChild!=null) base_el.removeChild(base_el.lastChild);

        rrd_data[0]=rrd_data[1]=rrd_data[2]=undefined;
    
        fname_group=document.getElementById("input_fname").value;

        fname1=fname_group+"_s1.rrd";
        fname2=fname_group+"_s2.rrd";
        fname3=fname_group+"_s3.rrd";

        document.getElementById("fname").firstChild.data="Loading group "+fname_group;
        try {
          FetchBinaryURLAsync(fname1,update_fname_handler,0);
        } catch (err) {
           alert("Failed loading "+fname1+"\n"+err);
        }
        try {
          FetchBinaryURLAsync(fname2,update_fname_handler,1);
        } catch (err) {
           alert("Failed loading "+fname2+"\n"+err);
        }
        try {
          FetchBinaryURLAsync(fname3,update_fname_handler,2);
        } catch (err) {
           alert("Failed loading "+fname3+"\n"+err);
        }
      }
    </script>
  </body>
</html>