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174 lines
4.2 KiB
HTML
174 lines
4.2 KiB
HTML
11 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>Flot Examples: AJAX</title>
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<link href="../examples.css" rel="stylesheet" type="text/css">
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<!--[if lte IE 8]><script language="javascript" type="text/javascript" src="../../excanvas.min.js"></script><![endif]-->
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<script language="javascript" type="text/javascript" src="../../jquery.js"></script>
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<script language="javascript" type="text/javascript" src="../../jquery.flot.js"></script>
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<script type="text/javascript">
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$(function() {
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var options = {
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lines: {
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show: true
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},
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points: {
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show: true
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},
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xaxis: {
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tickDecimals: 0,
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tickSize: 1
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}
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};
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var data = [];
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$.plot("#placeholder", data, options);
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// Fetch one series, adding to what we already have
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var alreadyFetched = {};
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$("button.fetchSeries").click(function () {
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var button = $(this);
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// Find the URL in the link right next to us, then fetch the data
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var dataurl = button.siblings("a").attr("href");
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function onDataReceived(series) {
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// Extract the first coordinate pair; jQuery has parsed it, so
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// the data is now just an ordinary JavaScript object
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var firstcoordinate = "(" + series.data[0][0] + ", " + series.data[0][1] + ")";
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button.siblings("span").text("Fetched " + series.label + ", first point: " + firstcoordinate);
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// Push the new data onto our existing data array
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if (!alreadyFetched[series.label]) {
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alreadyFetched[series.label] = true;
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data.push(series);
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}
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$.plot("#placeholder", data, options);
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}
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$.ajax({
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url: dataurl,
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type: "GET",
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dataType: "json",
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success: onDataReceived
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});
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});
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// Initiate a recurring data update
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$("button.dataUpdate").click(function () {
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data = [];
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alreadyFetched = {};
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$.plot("#placeholder", data, options);
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var iteration = 0;
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function fetchData() {
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++iteration;
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function onDataReceived(series) {
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// Load all the data in one pass; if we only got partial
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// data we could merge it with what we already have.
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data = [ series ];
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$.plot("#placeholder", data, options);
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}
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// Normally we call the same URL - a script connected to a
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// database - but in this case we only have static example
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// files, so we need to modify the URL.
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$.ajax({
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url: "data-eu-gdp-growth-" + iteration + ".json",
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type: "GET",
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dataType: "json",
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success: onDataReceived
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});
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if (iteration < 5) {
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setTimeout(fetchData, 1000);
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} else {
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data = [];
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alreadyFetched = {};
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}
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}
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setTimeout(fetchData, 1000);
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});
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// Load the first series by default, so we don't have an empty plot
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$("button.fetchSeries:first").click();
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// Add the Flot version string to the footer
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$("#footer").prepend("Flot " + $.plot.version + " – ");
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});
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</script>
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</head>
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<body>
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<div id="header">
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<h2>AJAX</h2>
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</div>
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<div id="content">
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<div class="demo-container">
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<div id="placeholder" class="demo-placeholder"></div>
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</div>
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<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>
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<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>
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<p>
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<button class="fetchSeries">First dataset</button>
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[ <a href="data-eu-gdp-growth.json">see data</a> ]
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<span></span>
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</p>
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<p>
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<button class="fetchSeries">Second dataset</button>
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[ <a href="data-japan-gdp-growth.json">see data</a> ]
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<span></span>
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</p>
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<p>
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<button class="fetchSeries">Third dataset</button>
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[ <a href="data-usa-gdp-growth.json">see data</a> ]
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<span></span>
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</p>
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<p>If you combine AJAX with setTimeout, you can poll the server for new data.</p>
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<p>
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<button class="dataUpdate">Poll for data</button>
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</p>
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</div>
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<div id="footer">
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Copyright © 2007 - 2014 IOLA and Ole Laursen
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</div>
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</body>
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</html>
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