interactive-vis-course/Week8/bar_updates_key_sorted.html at gh-pages · arnicas/interactive-vis-course · GitHub

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<!DOCTYPE html>
<!-- Modified example from enjalot: http://bl.ocks.org/enjalot/1429426 -->
<html>
 <head>
    <title>Bar Transition Example</title>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script>

    <style type="text/css">
    body {
        padding: 50px;
        font-family: sans-serif;
        font-size: 12pt;
    }
    button {
        margin: 5px;
        font-size: 15pt;
        padding: 3px;
        cursor: pointer;
        background: white;
    }

    .selected {
        background: pink;
    }

    input {
        margin: 5px;
        font-size: 15pt;
        padding: 3px;
    }
    p {
        width: 500px;
    }
    .data1 {
        width: 200px;
        position: absolute;
        left: 600px;
        top: 300px;
    }
    .data2 {
        width: 200px;
        position: absolute;
        left: 600px;
        top: 450px;
    }

    </style>
 </head>
 <body>
    <h2> Using Keys to Retain Bar Identity </h2>
    <p> An illustration of the use of the key function, to retain object consistency between updates. Bars that existed already will stay and labels (mouseover titles) will be correct.
    (Based on <a href="http://bl.ocks.org/enjalot/1429426">an example from enjalot</a>.)
        <div id="buttons">
        <button id="data1">Set Data to data 1</button>
        <button id="data2">Set Data to data 2</button>
        </div>

        <div id="chart">
        </div>

        <div class="data1"></div>
        <div class="data2"></div>

<script type="text/javascript">


    var data1 = [
        {country: "Belgium", value: 5}, // in data set 2
        {country: "USA", value: 20}, // in data set 2
        {country: "China", value: 55}, // in data set 2
        {country: "Russia", value: 15},
        {country: "France", value: 60}, // in data set 2
        {country: "Chile", value: 89}
    ];

    var data2 = [
        {country: "Belgium", value: 5}, // in data set 1
        {country: "USA", value: 20}, // in data set 1
        {country: "Spain", value: 35},
        {country: "China", value: 55}, // in data set 1
        {country: "UK", value: 90},
        {country: "Brazil", value: 40},
        {country: "France", value: 60}, // in data set 1
        {country: "Canada", value: 39},
        {country: "Argentina", value: 99}
    ];


    var fullwidth = 400;
    var fullheight = 400;

    var margin = {top: 10, right: 10, bottom: 10, left: 20};

    var width = fullwidth - margin.left - margin.right;
    var height = fullheight - margin.top - margin.bottom;

    //setup the svg

    var vis = d3.select("#chart").append("svg");
    var svg = vis
        .attr("width", fullwidth)
        .attr("height", fullheight)
        .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

    //setup our ui buttons:
    d3.select("#data1")
        .on("click", function(d,i) {
            d3.select(this).classed("selected", true);
            d3.select("#data2").classed("selected", false);
            redraw(data1);
        });
    d3.select("#data2")
        .on("click", function(d,i) {
            d3.select(this).classed("selected", true);
            d3.select("#data1").classed("selected", false);
            redraw(data2);
        });

    d3.select("div.data1").text("Data 1: " +JSON.stringify(data1));
    d3.select("div.data2").text("Data 2: " +JSON.stringify(data2));


    //make the bars for the first data set.  They will be red at first.

    d3.select("#data1").classed("selected", true);
    // Call the draw function for the first data set view, data1. This is initial view.
    redraw(data1);


    // This function is used to draw and update the data. It takes different data each time.

    function redraw(data) {

        var max = d3.max(data, function(d) {return d.value;});

        data.sort(function(a,b) {
            return d3.descending(a.value, b.value);
        });

        xScale = d3.scale.linear()
            .domain([0, max]) // calculated above
            .range([0, width]);

        yScale = d3.scale.ordinal()
            .domain(d3.range(data.length))
            .rangeBands([0, height], .2);

            // data  join:
        var bars = vis.selectAll("rect.bar")
            .data(data, function (d) { return d.country;}); // key function!
            //.data(data);

        //update -- existing bars get green when we "redraw". We don't change labels.
        bars
            .attr("fill", "green");

        //enter - new bars get set to red when we "redraw."
        bars.enter()
            .append("rect")
            .attr("class", "bar")
            .attr("fill", "red")
            .append("title")
            .text(function (d, i) { return d.country + ":" + d.value; });


        //exit -- remove ones that aren't in the index set
        bars.exit()
            .transition()
            .duration(300)
            .attr("width", 0)
            .remove();

        // update transition on all existing ones now -- move the bars to proper widths and location
        bars
            .transition()
            .duration(1000)
            .attr("width", function(d) {
                return xScale(d.value);
            })
            .attr("height", yScale.rangeBand())
            .attr("fill", "green") // -- turns them all to green at the end.
            .attr("transform", function(d,i) {
                return "translate(0," + yScale(i) + ")";
            });

        } // end of draw function

</script>
 </body>
</html>