You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
173 lines
4.2 KiB
173 lines
4.2 KiB
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> |
|
<html> |
|
<head> |
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
|
<title>Flot Examples: AJAX</title> |
|
<link href="../examples.css" rel="stylesheet" type="text/css"> |
|
<!--[if lte IE 8]><script language="javascript" type="text/javascript" src="../../excanvas.min.js"></script><![endif]--> |
|
<script language="javascript" type="text/javascript" src="../../jquery.js"></script> |
|
<script language="javascript" type="text/javascript" src="../../jquery.flot.js"></script> |
|
<script type="text/javascript"> |
|
|
|
$(function() { |
|
|
|
var options = { |
|
lines: { |
|
show: true |
|
}, |
|
points: { |
|
show: true |
|
}, |
|
xaxis: { |
|
tickDecimals: 0, |
|
tickSize: 1 |
|
} |
|
}; |
|
|
|
var data = []; |
|
|
|
$.plot("#placeholder", data, options); |
|
|
|
// Fetch one series, adding to what we already have |
|
|
|
var alreadyFetched = {}; |
|
|
|
$("button.fetchSeries").click(function () { |
|
|
|
var button = $(this); |
|
|
|
// Find the URL in the link right next to us, then fetch the data |
|
|
|
var dataurl = button.siblings("a").attr("href"); |
|
|
|
function onDataReceived(series) { |
|
|
|
// Extract the first coordinate pair; jQuery has parsed it, so |
|
// the data is now just an ordinary JavaScript object |
|
|
|
var firstcoordinate = "(" + series.data[0][0] + ", " + series.data[0][1] + ")"; |
|
button.siblings("span").text("Fetched " + series.label + ", first point: " + firstcoordinate); |
|
|
|
// Push the new data onto our existing data array |
|
|
|
if (!alreadyFetched[series.label]) { |
|
alreadyFetched[series.label] = true; |
|
data.push(series); |
|
} |
|
|
|
$.plot("#placeholder", data, options); |
|
} |
|
|
|
$.ajax({ |
|
url: dataurl, |
|
type: "GET", |
|
dataType: "json", |
|
success: onDataReceived |
|
}); |
|
}); |
|
|
|
// Initiate a recurring data update |
|
|
|
$("button.dataUpdate").click(function () { |
|
|
|
data = []; |
|
alreadyFetched = {}; |
|
|
|
$.plot("#placeholder", data, options); |
|
|
|
var iteration = 0; |
|
|
|
function fetchData() { |
|
|
|
++iteration; |
|
|
|
function onDataReceived(series) { |
|
|
|
// Load all the data in one pass; if we only got partial |
|
// data we could merge it with what we already have. |
|
|
|
data = [ series ]; |
|
$.plot("#placeholder", data, options); |
|
} |
|
|
|
// Normally we call the same URL - a script connected to a |
|
// database - but in this case we only have static example |
|
// files, so we need to modify the URL. |
|
|
|
$.ajax({ |
|
url: "data-eu-gdp-growth-" + iteration + ".json", |
|
type: "GET", |
|
dataType: "json", |
|
success: onDataReceived |
|
}); |
|
|
|
if (iteration < 5) { |
|
setTimeout(fetchData, 1000); |
|
} else { |
|
data = []; |
|
alreadyFetched = {}; |
|
} |
|
} |
|
|
|
setTimeout(fetchData, 1000); |
|
}); |
|
|
|
// Load the first series by default, so we don't have an empty plot |
|
|
|
$("button.fetchSeries:first").click(); |
|
|
|
// Add the Flot version string to the footer |
|
|
|
$("#footer").prepend("Flot " + $.plot.version + " – "); |
|
}); |
|
|
|
</script> |
|
</head> |
|
<body> |
|
|
|
<div id="header"> |
|
<h2>AJAX</h2> |
|
</div> |
|
|
|
<div id="content"> |
|
|
|
<div class="demo-container"> |
|
<div id="placeholder" class="demo-placeholder"></div> |
|
</div> |
|
|
|
<p>Example of loading data dynamically with AJAX. Percentage change in GDP (source: <a href="http://epp.eurostat.ec.europa.eu/tgm/table.do?tab=table&init=1&plugin=1&language=en&pcode=tsieb020">Eurostat</a>). Click the buttons below:</p> |
|
|
|
<p>The data is fetched over HTTP, in this case directly from text files. Usually the URL would point to some web server handler (e.g. a PHP page or Java/.NET/Python/Ruby on Rails handler) that extracts it from a database and serializes it to JSON.</p> |
|
|
|
<p> |
|
<button class="fetchSeries">First dataset</button> |
|
[ <a href="data-eu-gdp-growth.json">see data</a> ] |
|
<span></span> |
|
</p> |
|
|
|
<p> |
|
<button class="fetchSeries">Second dataset</button> |
|
[ <a href="data-japan-gdp-growth.json">see data</a> ] |
|
<span></span> |
|
</p> |
|
|
|
<p> |
|
<button class="fetchSeries">Third dataset</button> |
|
[ <a href="data-usa-gdp-growth.json">see data</a> ] |
|
<span></span> |
|
</p> |
|
|
|
<p>If you combine AJAX with setTimeout, you can poll the server for new data.</p> |
|
|
|
<p> |
|
<button class="dataUpdate">Poll for data</button> |
|
</p> |
|
|
|
</div> |
|
|
|
<div id="footer"> |
|
Copyright © 2007 - 2014 IOLA and Ole Laursen |
|
</div> |
|
|
|
</body> |
|
</html>
|
|
|