interacting.html

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    <title>Flot Examples</title>
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    <body>
    <h1>Flot Examples</h1>

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

    <p>One of the goals of Flot is to support user interactions. Try
    pointing and clicking on the points.</p>

    <p>
      <label><input id="enablePosition" type="checkbox">Show mouse position</label>
      <span id="hoverdata"></span>
      <span id="clickdata"></span>
    </p>

    <p>A tooltip is easy to build with a bit of jQuery code and the
    data returned from the plot.</p>

    <p><label><input id="enableTooltip" type="checkbox">Enable tooltip</label></p>

<script type="text/javascript">
$(function () {
    var sin = [], cos = [];
    for (var i = 0; i < 14; i += 0.5) {
        sin.push([i, Math.sin(i)]);
        cos.push([i, Math.cos(i)]);
    }

    var plot = $.plot($("#placeholder"),
           [ { data: sin, label: "sin(x)"}, { data: cos, label: "cos(x)" } ], {
               series: {
                   lines: { show: true },
                   points: { show: true }
               },
               grid: { hoverable: true, clickable: true },
               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;
    $("#placeholder").bind("plothover", function (event, pos, item) {
        if ($("#enablePosition:checked").length > 0) {
            var str = "(" + pos.x.toFixed(2) + ", " + pos.y.toFixed(2) + ")";
            $("#hoverdata").text(str);
        }

        if ($("#enableTooltip:checked").length > 0) {
            if (item) {
                if (previousPoint != item.dataIndex) {
                    previousPoint = item.dataIndex;
                    
                    $("#tooltip").remove();
                    var x = item.datapoint[0].toFixed(2),
                        y = item.datapoint[1].toFixed(2);
                    
                    showTooltip(item.pageX, item.pageY,
                                item.series.label + " of " + x + " = " + y);
                }
            }
            else {
                $("#tooltip").remove();
                previousPoint = null;            
            }
        }
    });

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

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