Flot example

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JavaScript jQuery CSS HTML Web

Flot is an open source javascript charting tool. I need to plot an interest rate curve in a web page, so the x-axis is date.

Here is an example modified from the file interacting.html in the flot example package

<!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>
	<script language="javascript" type="text/javascript" src="flotjs/excanvas.min.js"></script>
    <script language="javascript" type="text/javascript" src="flotjs/jquery.js"></script>
    <script language="javascript" type="text/javascript" src="flotjs/jquery.flot.js"></script>
 </head>
    <body>
    <h1>Flot Examples</h1>

    <div id="placeholder" style="width:600px;height:300px"></div>   

    <p id="hoverdata">Mouse hovers at
    (<span id="x">0</span>, <span id="y">0</span>). <span id="clickdata"></span></p>

<script id="source" language="javascript" type="text/javascript">
$(function () {
    var sin = [], cos = [];
    for (var i = 0; i < 50; i += 1) {
	    var date1 = new Date(); 
		date1 = date1.setDate(i+1);
        sin.push([date1, Math.sin(i)]);
    }

    var plot = $.plot($("#placeholder"),
           [ { data: sin, label: "sin(x)"} ], {
               series: {
                   lines: { show: true },
                   points: { show: true }
               },
               grid: { hoverable: true, clickable: true },
			   xaxis: { mode: 'time', timeformat: "%m/%d", ticks: 10},
               yaxis: { min: -1.2, max: 1.2 }
             });

    function showTooltip(x, y, contents) {
        $('<div id="tooltip">' + contents + '</div>').css( {
            position: 'absolute',
            display: 'none',
            top: y + 5,
            left: x + 5,
            border: '1px solid #fdd',
            padding: '2px',
            'background-color': '#fee',
            opacity: 0.80
        }).appendTo("body").fadeIn(200);
    }

    var previousPoint = null;
    $("#placeholder").bind("plothover", function (event, pos, item) {
        $("#x").text(pos.x.toFixed(2));
        $("#y").text(pos.y.toFixed(2));
        
		if (item) {
			if (previousPoint != item.datapoint) {
				previousPoint = item.datapoint;
				
				$("#tooltip").remove();
				var x = item.datapoint[0].toFixed(2),
					y = item.datapoint[1].toFixed(2);
				
				var ddd = new Date();
				ddd.setTime(x);
				var mmm = ddd.getMonth() + 1;
				var mdd = ddd.getDate() ;
				showTooltip(item.pageX, item.pageY,
							"(" + mmm + "/" + mdd + ", " + y + ")");
			}
		}
		else {
			$("#tooltip").remove();
			previousPoint = null;            
		}
        
    });

    $("#placeholder").bind("plotclick", function (event, pos, item) {
        if (item) {
            $("#clickdata").text("You clicked point " + item.dataIndex + " in " + item.series.label + ".");
            plot.highlight(item.series, item.datapoint);
        }
    });
});
</script>

 </body>
</html>

The result is like this: