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<!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 - 2013 IOLA and Ole Laursen </div> </body> </html>