Chartjs - Donut Chart label for small values not visible

问题

Values for my Chart range from 10 to 70000. Since 70000 is too large, small values are not visible in the chart and I cannot view its label on hovering over it. Is it possible to show all labels, without having to hover or any better solution for this. fiddle: https://jsfiddle.net/Sanal_5/e6zdk6jt/4/

[https://jsfiddle.net/Sanal_5/e6zdk6jt/4/][1]

回答1:

You could draw the legend for the pie chart by calling generateLegend on the created chart and add an event listen to highlight the segment when hovered over in the legend

$(function() {
  var pieChartCanvas = $("#pieChart").get(0).getContext("2d");

  var PieData = [{
    value: 70000,
    color: "#f56954",
    highlight: "#f56954",
    label: "Chrome"
  }, {
    value: 6000,
    color: "#00a65a",
    highlight: "#00a65a",
    label: "IE"
  }, {
    value: 4000,
    color: "#f39c12",
    highlight: "#f39c12",
    label: "FireFox"
  }, {
    value: 4000,
    color: "#00c0ef",
    highlight: "#00c0ef",
    label: "Safari"
  }, {
    value: 3000,
    color: "#3c8dbc",
    highlight: "#3c8dbc",
    label: "Opera"
  }, {
    value: 10,
    color: "#d2d6de",
    highlight: "#d2d6de",
    label: "Navigator"
  }];
  var pieOptions = {
    segmentShowStroke: true,
    segmentStrokeColor: "#fff",
    segmentStrokeWidth: 2,
    percentageInnerCutout: 50,
    animationSteps: 100,
    animationEasing: "easeOutBounce",
    animateRotate: true,
    animateScale: false,
    responsive: true,
    maintainAspectRatio: true
  };
  var pieChart = new Chart(pieChartCanvas).Doughnut(PieData, pieOptions);

  var helpers = Chart.helpers;
  var legendHolder = document.getElementById('graph-legend');
  legendHolder.innerHTML = pieChart.generateLegend();

  // Include a html legend template after the module doughnut itself
  helpers.each(legendHolder.firstChild.childNodes, function(legendNode, index) {
    helpers.addEvent(legendNode, 'mouseover', function() {
      var activeSegment = pieChart.segments[index];
      activeSegment.save();
      pieChart.showTooltip([activeSegment]);
      activeSegment.restore();
    });
  });
  helpers.addEvent(legendHolder.firstChild, 'mouseout', function() {
    pieChart.draw();
  });

  document.getElementById('graph-legend').appendChild(legendHolder.firstChild);

});

.box-body,
#graph-legend {
  width: 50%;
  float: left
}
#graph-legend ul {
  list-style: none;
}
#graph-legend ul li {
  display: block;
  padding-left: 30px;
  position: relative;
  margin-bottom: 4px;
  border-radius: 5px;
  padding: 2px 8px 2px 28px;
  font-size: 14px;
  cursor: default;
  -webkit-transition: background-color 200ms ease-in-out;
  -moz-transition: background-color 200ms ease-in-out;
  -o-transition: background-color 200ms ease-in-out;
  transition: background-color 200ms ease-in-out;
}
#graph-legend li span {
  display: block;
  position: absolute;
  left: 0;
  top: 0;
  width: 20px;
  height: 100%;
  border-radius: 5px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.js"></script>
<div class="box-body">
  <canvas id="pieChart" width="787" height="300"></canvas>
</div>
<div id="graph-legend"></div>

来源：https://stackoverflow.com/questions/35221071/chartjs-donut-chart-label-for-small-values-not-visible

标签

label

pie-chart

chart.js