1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Flot Examples</title> <link href="layout.css" rel="stylesheet" type="text/css"></link> <!--[if IE]><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> </head> <body> <h1>Flot Examples</h1> <div id="placeholder" style="width:600px;height:300px;"></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> <input class="fetchSeries" type="button" value="First dataset"> - <a href="data-eu-gdp-growth.json">data</a> - <span></span> </p> <p> <input class="fetchSeries" type="button" value="Second dataset"> - <a href="data-japan-gdp-growth.json">data</a> - <span></span> </p> <p> <input class="fetchSeries" type="button" value="Third dataset"> - <a href="data-usa-gdp-growth.json">data</a> - <span></span> </p> <p>If you combine AJAX with setTimeout, you can poll the server for new data.</p> <p> <input class="dataUpdate" type="button" value="Poll for data"> </p> <script id="source" language="javascript" type="text/javascript"> $(function () { var options = { lines: { show: true }, points: { show: true }, xaxis: { tickDecimals: 0, tickSize: 1 } }; var data = []; var placeholder = $("#placeholder"); $.plot(placeholder, data, options); // fetch one series, adding to what we got var alreadyFetched = {}; $("input.fetchSeries").click(function () { var button = $(this); // find the URL in the link right next to us var dataurl = button.siblings('a').attr('href'); // then fetch the data with jQuery function onDataReceived(series) { // extract the first coordinate pair so you can see that // data is now an ordinary Javascript object var firstcoordinate = '(' + series.data[0][0] + ', ' + series.data[0][1] + ')'; button.siblings('span').text('Fetched ' + series.label + ', first point: ' + firstcoordinate); // let's add it to our current data if (!alreadyFetched[series.label]) { alreadyFetched[series.label] = true; data.push(series); } // and plot all we got $.plot(placeholder, data, options); } $.ajax({ url: dataurl, method: 'GET', dataType: 'json', success: onDataReceived }); }); // initiate a recurring data update $("input.dataUpdate").click(function () { // reset data data = []; alreadyFetched = {}; $.plot(placeholder, data, options); var iteration = 0; function fetchData() { ++iteration; function onDataReceived(series) { // we get all the data in one go, if we only got partial // data, we could merge it with what we already got data = [ series ]; $.plot($("#placeholder"), data, options); } $.ajax({ // usually, we'll just 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 url: "data-eu-gdp-growth-" + iteration + ".json", method: 'GET', dataType: 'json', success: onDataReceived }); if (iteration < 5) setTimeout(fetchData, 1000); else { data = []; alreadyFetched = {}; } } setTimeout(fetchData, 1000); }); }); </script> </body> </html> |