D3ScatterplotAddTooltip

by stefano franco

HTML

<script src="http://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
<script type="application/json" id="points">
    [{
        "name": "ape man",
            "physicalstrength": 20,
            "fearfactor": 7,
            "killingpower": 12,
            "horrorrating": 4,
            "cluster": "green"

    }, {
        "name": "godzilla",
            "physicalstrength": 3,
            "fearfactor": 5,
            "killingpower": 4,
            "horrorrating": 8,
            "cluster": "blue"

    }, {
        "name": "the ghoul",
            "physicalstrength": 7,
            "fearfactor": 12,
            "killingpower": 2,
            "horrorrating": 7,
            "cluster": "blue"

    }, {
        "name": "the freak",
            "physicalstrength": 9,
            "fearfactor": 2,
            "killingpower": 1,
            "horrorrating": 17,
            "cluster": "blue"

    }, {
        "name": "dracula",
            "physicalstrength": 4,
            "fearfactor": 17,
            "killingpower": 5,
            "horrorrating": 16,
            "cluster": "blue"

    }, {
        "name": "the hangman",
            "physicalstrength": 2,
            "fearfactor": 4,
            "killingpower": 13,
            "horrorrating": 8,
            "cluster": "red"

    }, {
        "name": "incredible melting man",
            "physicalstrength": 3,
            "fearfactor": 8,
            "killingpower": 15,
            "horrorrating": 6,
            "cluster": "red"

    }, {
        "name": "the thing",
            "physicalstrength": 19,
            "fearfactor": 4,
            "killingpower": 11,
            "horrorrating": 7,
            "cluster": "green"

    }]
</script>
<body>
    <div id="container" style="width:800px">
        <div id="header">
             <h2>Interactive Scatterplot</h1>
        </div>
        <div id="menu">
X-axis:
<select id="xAxisVar" onchange="reDraw()" >
  <option></option>
  <option value="physicalstrength"...

CSS

body {
    font: .625em/1.2"Trebuchet MS", "Lucida Sans Unicode", "Lucida Grande", "Lucida Sans", Arial, sans-serif!important;
    background-color:#0f7fa8;
    color: white;
}
h2 {
    color:white;
}
#header {
    width:800px;
    height: 50px;
}
#menu {
    height:400px;
    width:150px;
    float:left;
}
#content {
    background-color:#ffffff;
    height:400px;
    width:650px;
    float:left;
}
#footer {
    clear:both;
    text-align:center;
}
.axis path, .axis line {
    fill: none;
    stroke: black;
    shape-rendering: crispEdges;
}
.axis text {
    font-family: sans-serif;
    font-size: 11px;
}

circle:hover {
    fill: pink;
}
.d3-tip {
    line-height: 1;
    font-weight: bold;
    padding: 1px;
    background: white;
    color: #000;
    border-radius: 2px;
}

JavaScript

//Parse JSON

var unparsed = document.getElementById('points').innerHTML;
dataset = JSON.parse(unparsed);


//Set constants

var w = 420,
    h = 400,
    padding = 30;


//Create adaptable scales

var xScale = d3.scale.linear()
    .domain([0, d3.max(dataset, function (d) {
    return d3.max([d.physicalstrength, d.fearfactor, d.killingpower, d.horrorrating]);
})])
    .range([padding, w - padding]);

var yScale = d3.scale.linear()
    .domain([0, d3.max(dataset, function (d) {
    return d3.max([d.physicalstrength, d.fearfactor, d.killingpower, d.horrorrating]);
})])
    .range([h - padding, padding]);

//Define the tooltip

var tip = d3.tip()
    .attr('class', 'd3-tip')
    .offset([-10, 0])
    .html(function (d) {
    return "<br><strong>name:</strong> <span style='color:red'>" + d.name + "</span></br>" +
           `"<br><strong>Physical Strength: </strong> <span style='color:red'>" + d.physicalstrength + "</span></br>"
            ;
});



//Set up the svg

var svg = d3.select("#content")
    .append("svg")
    .attr("width", w)
    .attr("height", h);

svg.call(tip);

//Add in circles for each data point

svg.selectAll("circle")
    .data(dataset)
    .enter()
    .append("circle")
    .attr("cx", function (d) {
    return xScale(d.physicalstrength);
})
    .attr("cy", function (d) {
    return yScale(d.fearfactor);
})
    .attr("fill", function (d) {
    return d.cluster;
})
    .attr("r", 5)
    .on('mouseover', tip.show)
    .on('mouseout', tip.hide);


//Set up the axes

var xAxis = d3.svg.axis()
    .scale(xScale)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(yScale)
    .orient("left");

svg.append("g")
    .attr("class", "axis")
    .attr("transform", "translate(0," + (h - padding) + ")")
    .call(xAxis);

svg.append("g")
    .attr("class", "axis")
    .attr("transform", "translate(" + padding + ",0)")
    .call(yAxis);

function reDraw() {

    xVar = document.getElementById('xAxisVar').value;
    yVar =...