topical media & game development

topical media & game development

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

mobile-data-circle-12.htm / htm


  <script src="http://d3js.org/d3.v3.min.js"></script>
  <link rel="stylesheet" type="text/css" href="mobile-data-circle-style-d3.css">
  <script type="text/javascript">

data


    var data = [32, 57, 112],
        dataEnter = data.concat(293),
        dataExit = data.slice(0, 2),
        w = 360,
        h = 180,
        x = d3.scale.ordinal().domain([57, 32, 112]).rangePoints([0, w], 1),
        y = d3.scale.ordinal().domain(data).rangePoints([0, h], 2);

</script> <p>All that’s left to do, then, is to remove the exiting elements:</p> <div class="chart" id="chart-12"> <pre class="code">circle.exit().remove(); </pre> <button>run</button>  </div> <script type="text/javascript">

script


  (function() {
    var svg = d3.select("#chart-12").append("svg")
        .attr("width", w)
        .attr("height", h);

select


    var g = svg.selectAll(".data")
        .data(data)
      .enter().append("g")
        .attr("class", "data")
        .attr("transform", function(d) { return "translate(" + x(d) + "," + y(d) + ")"; });

append


    g.append("circle")
        .attr("class", "little")
        .attr("r", 12);
  
    g.append("text")
        .attr("dy", ".35em")
        .attr("text-anchor", "middle")
        .text(String);

filter


    g = g.filter(function(d, i) { return i == 2; });
  
    g.select("circle")
        .style("fill", "lightcoral")
        .style("stroke", "red");

button


    d3.select("#chart-12 button").on("click", function() {
      g.select("circle").attr("r", 12);
      g.select("text").style("opacity", 1);
      var t = g.transition().duration(750);
      t.select("circle").attr("r", 1e-6);
      t.select("text").style("opacity", 1e-6);
    });
  })();

</script> <p>The enter, update and exit selections are computed by the <a href="https://github.com/mbostock/d3/wiki/Selections#data">data</a> operator, and don’t change when you append or remove elementst least until you call <a href="https://github.com/mbostock/d3/wiki/Selections#selectAll">selectAll</a> again. So, if you keep variables around that point to selections (such as <code>circle</code>, above), you’ll probably want to reselect after adding or removing elements.</p>

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