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      1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
      2 <html>
      3 <head>
      4 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
      5 	<title>Flot Examples: AJAX</title>
      6 	<link href="../examples.css" rel="stylesheet" type="text/css">
      7 	<!--[if lte IE 8]><script language="javascript" type="text/javascript" src="../../excanvas.min.js"></script><![endif]-->
      8 	<script language="javascript" type="text/javascript" src="../../jquery.js"></script>
      9 	<script language="javascript" type="text/javascript" src="../../jquery.flot.js"></script>
     10 	<script type="text/javascript">
     11 
     12 	$(function() {
     13 
     14 		var options = {
     15 			lines: {
     16 				show: true
     17 			},
     18 			points: {
     19 				show: true
     20 			},
     21 			xaxis: {
     22 				tickDecimals: 0,
     23 				tickSize: 1
     24 			}
     25 		};
     26 
     27 		var data = [];
     28 
     29 		$.plot("#placeholder", data, options);
     30 
     31 		// Fetch one series, adding to what we already have
     32 
     33 		var alreadyFetched = {};
     34 
     35 		$("button.fetchSeries").click(function () {
     36 
     37 			var button = $(this);
     38 
     39 			// Find the URL in the link right next to us, then fetch the data
     40 
     41 			var dataurl = button.siblings("a").attr("href");
     42 
     43 			function onDataReceived(series) {
     44 
     45 				// Extract the first coordinate pair; jQuery has parsed it, so
     46 				// the data is now just an ordinary JavaScript object
     47 
     48 				var firstcoordinate = "(" + series.data[0][0] + ", " + series.data[0][1] + ")";
     49 				button.siblings("span").text("Fetched " + series.label + ", first point: " + firstcoordinate);
     50 
     51 				// Push the new data onto our existing data array
     52 
     53 				if (!alreadyFetched[series.label]) {
     54 					alreadyFetched[series.label] = true;
     55 					data.push(series);
     56 				}
     57 
     58 				$.plot("#placeholder", data, options);
     59 			}
     60 
     61 			$.ajax({
     62 				url: dataurl,
     63 				type: "GET",
     64 				dataType: "json",
     65 				success: onDataReceived
     66 			});
     67 		});
     68 
     69 		// Initiate a recurring data update
     70 
     71 		$("button.dataUpdate").click(function () {
     72 
     73 			data = [];
     74 			alreadyFetched = {};
     75 
     76 			$.plot("#placeholder", data, options);
     77 
     78 			var iteration = 0;
     79 
     80 			function fetchData() {
     81 
     82 				++iteration;
     83 
     84 				function onDataReceived(series) {
     85 
     86 					// Load all the data in one pass; if we only got partial
     87 					// data we could merge it with what we already have.
     88 
     89 					data = [ series ];
     90 					$.plot("#placeholder", data, options);
     91 				}
     92 
     93 				// Normally we call the same URL - a script connected to a
     94 				// database - but in this case we only have static example
     95 				// files, so we need to modify the URL.
     96 
     97 				$.ajax({
     98 					url: "data-eu-gdp-growth-" + iteration + ".json",
     99 					type: "GET",
    100 					dataType: "json",
    101 					success: onDataReceived
    102 				});
    103 
    104 				if (iteration < 5) {
    105 					setTimeout(fetchData, 1000);
    106 				} else {
    107 					data = [];
    108 					alreadyFetched = {};
    109 				}
    110 			}
    111 
    112 			setTimeout(fetchData, 1000);
    113 		});
    114 
    115 		// Load the first series by default, so we don't have an empty plot
    116 
    117 		$("button.fetchSeries:first").click();
    118 
    119 		// Add the Flot version string to the footer
    120 
    121 		$("#footer").prepend("Flot " + $.plot.version + " &ndash; ");
    122 	});
    123 
    124 	</script>
    125 </head>
    126 <body>
    127 
    128 	<div id="header">
    129 		<h2>AJAX</h2>
    130 	</div>
    131 
    132 	<div id="content">
    133 
    134 		<div class="demo-container">
    135 			<div id="placeholder" class="demo-placeholder"></div>
    136 		</div>
    137 
    138 		<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>
    139 
    140 		<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>
    141 
    142 		<p>
    143 			<button class="fetchSeries">First dataset</button>
    144 			[ <a href="data-eu-gdp-growth.json">see data</a> ]
    145 			<span></span>
    146 		</p>
    147 
    148 		<p>
    149 			<button class="fetchSeries">Second dataset</button>
    150 			[ <a href="data-japan-gdp-growth.json">see data</a> ]
    151 			<span></span>
    152 		</p>
    153 
    154 		<p>
    155 			<button class="fetchSeries">Third dataset</button>
    156 			[ <a href="data-usa-gdp-growth.json">see data</a> ]
    157 			<span></span>
    158 		</p>
    159 
    160 		<p>If you combine AJAX with setTimeout, you can poll the server for new data.</p>
    161 
    162 		<p>
    163 			<button class="dataUpdate">Poll for data</button>
    164 		</p>
    165 
    166 	</div>
    167 
    168 	<div id="footer">
    169 		Copyright &copy; 2007 - 2013 IOLA and Ole Laursen
    170 	</div>
    171 
    172 </body>
    173 </html>