JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://people.iola.dk/olau/flot/jquery.flot.js"></script>
<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 id="hoverdata">Mouse hovers at
    (<span id="x">0</span>, <span id="y">0</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><input id="enableTooltip" type="checkbox" checked>Enable tooltip</p>

JavaScript

$(function() {
    var clickedItems = [];
    var d = [{
        label: "Fake!",
        data: [[1290802154, 0.3], [1292502155, 0.1]]}];
    var options = {
        xaxis: {
            mode: "time"
        },
        series: {
            lines: {
                show: true
            },
            points: {
                show: true
            }
        },
        grid: {
            hoverable: true,
            clickable: true
        }
    };
    $.plot($("#placeholder"), d, options);

    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),
                    //set default content for tooltip
                    content = item.series.label + " of " + x + " = " + y;
                
                // if there is a cached item object at this index use it instead
                if(clickedItems[item.dataIndex])
                    content = clickedItems[item.dataIndex].alternateText;
                //now show tooltip
                showTooltip(item.pageX, item.pageY, content);
            }
        }
        else {
            $("#tooltip").remove();
            previousPoint = null;
        }

    });

    $("#placeholder").bind("plotclick", function(event, pos, item) {
        if...