root / hci / trunk / eneraptor-web-app / web-app / js / flot / examples / ajax.html @ 11
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.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</title> |
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<link href="layout.css" rel="stylesheet" type="text/css"></link> |
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<!--[if IE]><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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</head>
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<body>
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<h1>Flot Examples</h1> |
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<div id="placeholder" style="width:600px;height:300px;"></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
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files. Usually the URL would point to some web server handler |
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(e.g. a PHP page or Java/.NET/Python/Ruby on Rails handler) that |
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extracts it from a database and serializes it to JSON.</p>
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<p>
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<input class="fetchSeries" type="button" value="First dataset"> - |
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<a href="data-eu-gdp-growth.json">data</a> - |
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<span></span> |
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</p>
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<p>
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<input class="fetchSeries" type="button" value="Second dataset"> - |
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<a href="data-japan-gdp-growth.json">data</a> - |
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<span></span> |
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</p>
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<p>
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<input class="fetchSeries" type="button" value="Third dataset"> - |
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<a href="data-usa-gdp-growth.json">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
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for new data.</p>
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<p>
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<input class="dataUpdate" type="button" value="Poll for data"> |
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</p>
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<script id="source" language="javascript" type="text/javascript"> |
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$(function () {
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var options = {
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lines: { show: true },
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points: { show: true },
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xaxis: { tickDecimals: 0, tickSize: 1 }
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};
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var data = [];
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var placeholder = $("#placeholder");
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$.plot(placeholder, data, options);
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// fetch one series, adding to what we got
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var alreadyFetched = {};
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$("input.fetchSeries").click(function () {
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var button = $(this);
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// find the URL in the link right next to us
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var dataurl = button.siblings('a').attr('href');
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// then fetch the data with jQuery
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function onDataReceived(series) {
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// extract the first coordinate pair so you can see that
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// data is now an ordinary Javascript object
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var firstcoordinate = '(' + series.data[0][0] + ', ' + series.data[0][1] + ')';
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button.siblings('span').text('Fetched ' + series.label + ', first point: ' + firstcoordinate);
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// let's add it to our current data
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if (!alreadyFetched[series.label]) {
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alreadyFetched[series.label] = true;
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data.push(series);
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}
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// and plot all we got
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$.plot(placeholder, data, options);
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}
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$.ajax({
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url: dataurl,
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method: 'GET',
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dataType: 'json',
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success: onDataReceived
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});
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});
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// initiate a recurring data update
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$("input.dataUpdate").click(function () {
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// reset data
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data = [];
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alreadyFetched = {};
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$.plot(placeholder, data, options);
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var iteration = 0;
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function fetchData() {
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++iteration;
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function onDataReceived(series) {
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// we get all the data in one go, if we only got partial
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// data, we could merge it with what we already got
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data = [ series ];
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$.plot($("#placeholder"), data, options);
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}
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$.ajax({
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// usually, we'll just call the same URL, a script
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// connected to a database, but in this case we only
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// have static example files so we need to modify the
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// URL
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url: "data-eu-gdp-growth-" + iteration + ".json",
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method: '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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});
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</script>
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</body>
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</html>
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