Having legends inside the Chart.js canvas on mouse hover - Javascript Chart.js

Javascript examples for Chart.js:Legend

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Description

Having legends inside the Chart.js canvas on mouse hover

Demo Code

ResultView the demo in separate window 

<html>
   <head> 
      <meta name="viewport" content="width=device-width, initial-scale=1"> 
      <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js"></script> 
      <script type="text/javascript">
    window.onload=function(){//w  ww .  j  a v a2 s .co  m
var radarChartData = {
  labels: ["Eating", "Drinking", "Sleeping", "Designing", "Coding", "Cycling", "Running"],
  datasets: [{
    label: "My First dataset",
    fillColor: "rgba(220,220,220,0.2)",
    strokeColor: "rgba(220,220,220,1)",
    pointColor: "rgba(220,220,220,1)",
    pointStrokeColor: "#fff",
    pointHighlightFill: "#fff",
    pointHighlightStroke: "rgba(220,220,220,1)",
    data: [65, 59, 90, 81, 56, 55, 40]
  }, {
    label: "My Second dataset",
    fillColor: "rgba(151,187,205,0.2)",
    strokeColor: "rgba(151,187,205,1)",
    pointColor: "rgba(151,187,205,1)",
    pointStrokeColor: "#fff",
    pointHighlightFill: "#fff",
    pointHighlightStroke: "rgba(151,187,205,1)",
    data: [28, 48, 40, 19, 96, 27, 100]
  }]
};
// legend for Chart
var legend = "<ul style=\"list-style-type:none;\">";
radarChartData.datasets.forEach(function(dataset){
  legend += "<li><div style=\"background-color:" + dataset.strokeColor + ";height:0.5em;width:0.5em;float:left;margin-top:0.5em;margin-right:0.5em;\"></div><span style='font-family:Verdana;font-size: 12px;'>";
  if (dataset.label) {
    legend += dataset.label
  }
  legend += "</span></li>";
})
legend += "</ul>";
var data = '<svg xmlns="http://www.w3.org/2000/svg">' +
  '<foreignObject width="100%" height="100%">' +
  '<div xmlns="http://www.w3.org/1999/xhtml" style="font-size:20px">' +
  legend +
  '</div>' +
  '</foreignObject>' +
  '</svg>';
var DOMURL = window.URL || window.webkitURL || window;
var img = new Image();
var svg = new Blob([data], {
  type: 'image/svg+xml;charset=utf-8'
});
var url = DOMURL.createObjectURL(svg);
img.onload = function() {
  DOMURL.revokeObjectURL(url);
  Chart.types.Radar.extend({
    name: "RadarAlt",
    draw: function() {
      this.scale.yCenter = this.chart.width / 2;
      Chart.types.Radar.prototype.draw.apply(this, arguments);
      this.chart.ctx.drawImage(img, 0, this.chart.width);
    }
  });
  // create chart
  var ctx = document.getElementById("radaranalytics").getContext('2d');
  var radar = new Chart(ctx).RadarAlt(radarChartData, {
    responsive: true
  });
}
img.src = url;
    }

      </script> 
   </head> 
   <body> 
      <canvas id="radaranalytics" height="350" width="300"></canvas>  
   </body>
</html>

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