interactive-vis-course/Week8/bar_updates_no_key.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 {
        position: absolute;
        left: 600px;
        top: 400px;
    }
    .data2 {
        position: absolute;
        left: 600px;
        top: 420px;
    }

    </style>
 </head>
 <body>

     <h2>Bar Updates with No Key Value</h2>
    <p> An illustration of how index is used for data without a key function. DON'T DO THIS.
    (Based on <a href="http://bl.ocks.org/enjalot/1429426">an example from enjalot</a>.) THIS IS AN ILLUSTRATION OF HOW YOUR VIS COULD GO WRONG.  See instead <a href="bar_updates_key.html">bar_updates_key.html</a>.

        <div id="buttons">
        <button id="data1">Set Data to data 1</button>
        <button id="data2">Set Data to data 2</button>
        <br>
        <button id="random">Random Data of Size:</button>
        <input id="num" value=10 size=2></input>
        </div>

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

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


<script type="text/javascript">


    var data1 = [
        5,
        20,
        55,
        60,
        90
    ];

    var data2 = [
        35,
        80,
        35,
        80,
        20,
        15,
        10
    ];

    function random(n) {
        // created an array of n random numbers.
        vals = [];
        for(i = 0; i < n; i++) {
            vals.push(Math.random() * 100);
        }
        return vals;
    }


    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.selectAll("button").classed("selected", false);
            d3.select(this).classed("selected", true);
            redraw(data1);
        });
    d3.select("#data2")
        .on("click", function(d,i) {
            d3.selectAll("button").classed("selected", false);
            d3.select(this).classed("selected", true);
            redraw(data2);
        });
    d3.select("#random")
        .on("click", function(d,i) {
            d3.selectAll("button").classed("selected", false);
            d3.select(this).classed("selected", true);
            var num = document.getElementById("num").value;
            redraw(random(num));
        });

    // set up the data listing on the right side

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

    //make the bars for the first data set.
    d3.select("#data1").classed("selected", true);
    redraw(data1);

    function redraw(data) {

        var max = d3.max(data);

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

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

        // THIS IS WHAT NOT TO DO:
        var bars = vis.selectAll("rect.bar")
            .data(data); // this data is unstructured, so no keys. just index order.

        //update -- existing bars get green when we "redraw".
        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 i + ":" + d; }); // this is the original i, d pair.


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

        // transition -- moves bars to new width and new position, based on index.
        bars
            .transition()
            .duration(300)
            //.ease("quad")
                .attr("width", xScale) // same as calling this on d in a function
                .attr("height", yScale.rangeBand())
                .attr("transform", function(d,i) {
                    return "translate(0," + yScale(i) + ")";
                });

        } // end of draw function

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