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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/
For this example we load the required scripts directly from their examples page.
Production web pages should download their copy and serve them locally.
-->
<html>
<script type="text/javascript" src="../lib/binaryXHR.js"></script>
<script type="text/javascript" src="../lib/rrdFile.js"></script>
<!-- Using jFlot example URL... never do this on production pages -->
<script type="text/javascript" src="http://people.iola.dk/olau/flot/jquery.js"></script>
<script type="text/javascript" src="http://people.iola.dk/olau/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 border=0>
<tr>
<td>DS: <select id="select_ds"></select></td>
<td>RRA: <select id="select_rra"></select></td>
<td><button id="dsrra_button" onclick="element_update()" disabled=1>Update</button></td>
</tr>
</table>
<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>
<tr>
<td><b>DS</b></td><td id="ds_el">None</td>
<td><b>RRA</b></td><td id="rra_el">None</td>
<td><b>Step</b></td><td id="step_el">N/A</td>
</tr>
</table>
<div id="placeholder" style="width:600px;height:300px;"></div>
<div id="overview" style="margin-left:50px;margin-top:20px;width:400px;height:50px"></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()
// But first cleanup anything that may be there from before
document.getElementById("ds_el").firstChild.data="None";
var oSelect=document.getElementById("select_ds");
while (oSelect.options.length>=1) {
oSelect.remove(0);
}
for (var i=0; i<nrDSs; i++) {
var ds_name=rrd_data.getDS(i).getName();
oSelect.options.add(new Option(ds_name,i,false,false));
}
// Update RRA info
var nrRRAs=rrd_data.getNrRRAs()
// But first cleanup anything that may be there from before
document.getElementById("step_el").firstChild.data="N/A";
document.getElementById("rra_el").firstChild.data="None";
var oSelect=document.getElementById("select_rra");
while (oSelect.options.length>=1) {
oSelect.remove(0);
}
for (var i=0; i<nrRRAs; i++) {
oSelect.options.add(new Option(i,i,false,false));
}
// cleanup
$.plot($("#placeholder"), [[]],{});
$.plot($("#overview"),[[]],{});
// Finally, update the file name and enable the update button
document.getElementById("fname").firstChild.data=fname;
document.getElementById("dsrra_button").disabled=0;
}
// This function updates the Web Page with the data from the RRD archive
function element_update() {
oSelDS=document.getElementById("select_ds");
ds_idx=Math.round(oSelDS.options[oSelDS.selectedIndex].value);
oSelRRA=document.getElementById("select_rra");
rra_idx=oSelRRA.options[oSelRRA.selectedIndex].value;
// Generic header info
document.getElementById("ds_el").firstChild.data=rrd_data.getDS(ds_idx).getName();;
document.getElementById("rra_el").firstChild.data=rra_idx;
// get RRA info
var rra=rrd_data.getRRA(rra_idx);
var rows=rra.getNrRows();
var last_update=rrd_data.getLastUpdate();
var step=rra.getStep();
document.getElementById("step_el").firstChild.data=step;
var rra_pairs=[]
for (var i=0; i<rows;i++) {
var el=rra.getElFast(i,ds_idx);
if (el!=undefined) {
rra_pairs[i]=([(last_update+(i-rows+1)*step)*1000.0,el]);
} else {
rra_pairs[i]=null;
}
}
// Plot
var options = {
lines: { show: true },
xaxis: { mode: "time" },
selection: { mode: "x" },
};
var plot = $.plot($("#placeholder"), [rra_pairs], options);
var overview = $.plot($("#overview"), [rra_pairs], options);
// now connect the two
$("#placeholder").bind("plotselected", function (event, ranges) {
// do the zooming
plot = $.plot($("#placeholder"), [rra_pairs],
$.extend(true, {}, options, {
xaxis: { min: ranges.xaxis.from, max: ranges.xaxis.to }
}));
// don't fire event on the overview to prevent eternal loop
overview.setSelection(ranges, true);
});
$("#overview").bind("plotselected", function (event, ranges) {
plot.setSelection(ranges);
});
}
// 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);
}
}
// Uncomment this part if you want the Web page to load the
// default RRD file at load time
//
//try {
// FetchBinaryURLAsync(fname,update_fname_handler);
//} catch (err) {
// alert("Failed loading "+fname+"\n"+err);
//}
</script>
</body>
</html>
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