Chart.js Y axis label, reverse tooltip order, shorten X axis labels - Javascript Chart.js

Javascript examples for Chart.js:Chart Tooltip

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Description

Chart.js Y axis label, reverse tooltip order, shorten X axis labels

Demo Code

ResultView the demo in separate window 

<html>
   <head> 
      <title>Chart js line example</title> 
      <meta name="viewport" content="width=device-width, initial-scale=1"> 
      <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.2.1/Chart.js"></script> 
      <script type="text/javascript">
    window.onload=function(){//from w  w  w  .  j  a va 2 s .  c  o m
var chartColors = {
  red: 'rgb(255, 99, 132)',
  orange: 'rgb(255, 159, 64)',
  yellow: 'rgb(255, 205, 86)',
  green: 'rgb(75, 192, 192)',
  blue: 'rgb(54, 162, 235)',
  purple: 'rgb(153, 102, 255)',
  grey: 'rgb(231,233,237)'
};
var randomScalingFactor = function() {
  return (Math.random() > 0.5 ? 1.0 : -1.0) * Math.round(Math.random() * 100);
}
var MONTHS = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
var config = {
  type: 'line',
  data: {
    labels: ["January", "February", "March", "April", "May", "June", "July"],
    datasets: [{
      label: "My First dataset",
      backgroundColor: chartColors.red,
      borderColor: chartColors.red,
      data: [
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor()
      ],
      fill: false,
    }, {
      label: "My Second dataset",
      fill: false,
      backgroundColor: chartColors.blue,
      borderColor: chartColors.blue,
      data: [
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor(),
        randomScalingFactor()
      ],
    }]
  },
  options: {
    responsive: true,
    title: {
      display: true,
      text: 'Chart.js Line Chart'
    },
    tooltips: {
      mode: 'label',
    },
    hover: {
      mode: 'nearest',
      intersect: true
    },
    scales: {
      xAxes: [{
        display: true,
        ticks: {
          userCallback: function(label, index, labels) {
            if(typeof label === "string")
          {
             return label.substring(0,1)
          }
            return label
          },
        },
        scaleLabel: {
          display: true,
          labelString: 'Month'
        }
      }],
      yAxes: [{
        display: true,
        scaleLabel: {
          display: true,
          labelString: 'Value'
        }
      }]
    }
  }
};
var ctx = document.getElementById("canvas").getContext("2d");
window.myLine = new Chart(ctx, config);
    }

      </script> 
   </head> 
   <body> 
      <div style="width:75%;"> 
         <canvas id="canvas"></canvas> 
      </div>  
   </body>
</html>

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