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<title>Flot Examples</title>
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<h1>Flot Examples</h1>
<div id="placeholder" style="width:600px;height:300px;"></div>
<p>You can update a chart periodically to get a real-time effect
by using a timer to insert the new data in the plot and redraw it.</p>
<p>Time between updates: <input id="updateInterval" type="text" value="" style="text-align: right; width:5em"> milliseconds</p>
<script type="text/javascript">
$(function () {
// we use an inline data source in the example, usually data would
// be fetched from a server
var data = [], totalPoints = 300;
function getRandomData() {
if (data.length > 0)
data = data.slice(1);
// do a random walk
while (data.length < totalPoints) {
var prev = data.length > 0 ? data[data.length - 1] : 50;
var y = prev + Math.random() * 10 - 5;
if (y < 0)
y = 0;
if (y > 100)
y = 100;
data.push(y);
}
// zip the generated y values with the x values
var res = [];
for (var i = 0; i < data.length; ++i)
res.push([i, data[i]])
return res;
}
// setup control widget
var updateInterval = 30;
$("#updateInterval").val(updateInterval).change(function () {
var v = $(this).val();
if (v && !isNaN(+v)) {
updateInterval = +v;
if (updateInterval < 1)
updateInterval = 1;
if (updateInterval > 2000)
updateInterval = 2000;
$(this).val("" + updateInterval);
}
});
// setup plot
var options = {
series: { shadowSize: 0 }, // drawing is faster without shadows
yaxis: { min: 0, max: 100 },
xaxis: { show: false }
};
var plot = $.plot($("#placeholder"), [ getRandomData() ], options);
function update() {
plot.setData([ getRandomData() ]);
// since the axes don't change, we don't need to call plot.setupGrid()
plot.draw();
setTimeout(update, updateInterval);
}
update();
});
</script>
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