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<title>Flot Examples: Interacting with axes</title>
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$(function() {

        function generate(start, end, fn) {
                var res = [];
                for (var i = 0; i <= 100; ++i) {
                        var x = start + i / 100 * (end - start);
                        res.push([x, fn(x)]);
                }
                return res;
        }

        var data = [
                { data: generate(0, 10, function (x) { return Math.sqrt(x);}), xaxis: 1, yaxis:1 },
                { data: generate(0, 10, function (x) { return Math.sin(x);}), xaxis: 1, yaxis:2 },
                { data: generate(0, 10, function (x) { return Math.cos(x);}), xaxis: 1, yaxis:3 },
                { data: generate(2, 10, function (x) { return Math.tan(x);}), xaxis: 2, yaxis: 4 }
        ];

        var plot = $.plot("#placeholder", data, {
                xaxes: [
                        { position: 'bottom' },
                        { position: 'top'}
                ],
                yaxes: [
                        { position: 'left' },
                        { position: 'left' },
                        { position: 'right' },
                        { position: 'left' }
                ]
        });

        // Create a div for each axis

        $.each(plot.getAxes(), function (i, axis) {
                if (!axis.show)
                        return;

                var box = axis.box;

                $("<div class='axisTarget' style='position:absolute; left:" + box.left + "px; top:" + box.top + "px; width:" + box.width +  "px; height:" + box.height + "px'></div>")
                        .data("axis.direction", axis.direction)
                        .data("axis.n", axis.n)
                        .css({ backgroundColor: "#f00", opacity: 0, cursor: "pointer" })
                        .appendTo(plot.getPlaceholder())
                        .hover(
                                function () { $(this).css({ opacity: 0.10 }) },
                                function () { $(this).css({ opacity: 0 }) }
                        )
                        .click(function () {
                                $("#click").text("You clicked the " + axis.direction + axis.n + "axis!")
                        });
        });

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        $("#footer").prepend("Flot " + $.plot.version + " &ndash; ");
});

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<div id="header">
        <h2>Interacting with axes</h2>
</div>

<div id="content">

        <div class="demo-container">
                <div id="placeholder" class="demo-placeholder"></div>
        </div>

        <p>With multiple axes, you sometimes need to interact with them. A simple way to do this is to draw the plot, deduce the axis placements and insert a couple of divs on top to catch events.</p>

        <p>Try clicking an axis.</p>

        <p id="click"></p>

</div>

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        Copyright &copy; 2007 - 2014 IOLA and Ole Laursen
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