[Chartjs]-Chart.js Chart Never Generated

by

2👍

✅

Couple of Issues :

  • You are not defining the chart types correctly. First dataset­‘s type should be outside of the dataset itself.
  • You are assigning datasets array independently, while it belongs to data object (same goes for the labels array).
  • Since, values and values1 are already an array, they should not be wrapped with array notation.

­Here is the revised version of your code :

var labelsarr = ['Jan', 'Feb', 'Mar'];
var values = [1, 2, 3];
var values1 = [1, 2, 3];

// above variables are explicitly defined, since no ajax is being used

var ctx = document.getElementById('canvas').getContext('2d');
var chart = new Chart(ctx, {
   type: 'bar',
   data: {
      labels: labelsarr,
      datasets: [{
         label: 'Red Team',
         backgroundColor: 'rgba(0, 129, 214, 0.8)',
         data: values
      }, {
         type: 'line',
         label: 'Green Team',
         backgroundColor: 'rgba(0,129, 218, 0.3)',
         data: values1
      }]
   },
   options: {
      tooltips: {
         callbacks: {
            label: function(t, d) {
               var xLabel = d.datasets[t.datasetIndex].label;
               var yLabel = t.yLabel >= 1000 ? '$' + t.yLabel.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",") : '$' + t.yLabel;
               return xLabel + ': ' + yLabel;
            }
         }
      },
      legend: {
         display: false,
         position: 'top',
      },
      scales: {
         yAxes: [{
            ticks: {
               beginAtZero: true,
               callback: function(value, index, values) {
                  if (parseInt(value) >= 1000) {
                     return '$' + value.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
                  } else {
                     return '$' + value;
                  }
               }
            }
         }]
      }
   },
   plugins: [{
      beforeDraw: function(chart) {
         var labels = chart.data.labels;
      }
   }]
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id="canvas"></canvas>

0👍

Refering to Doc here http://www.chartjs.org/docs/latest/

1 chart can be either line or Bar you have specified both

It should look something like this just rearrage your code and try should work fine 

var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
    type: 'bar',
    data: {
        labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
        datasets: [{
            label: '# of Votes',
            data: [12, 19, 3, 5, 2, 3],
            backgroundColor: [
                'rgba(255, 99, 132, 0.2)',
                'rgba(54, 162, 235, 0.2)',
                'rgba(255, 206, 86, 0.2)',
                'rgba(75, 192, 192, 0.2)',
                'rgba(153, 102, 255, 0.2)',
                'rgba(255, 159, 64, 0.2)'
            ],
            borderColor: [
                'rgba(255,99,132,1)',
                'rgba(54, 162, 235, 1)',
                'rgba(255, 206, 86, 1)',
                'rgba(75, 192, 192, 1)',
                'rgba(153, 102, 255, 1)',
                'rgba(255, 159, 64, 1)'
            ],
            borderWidth: 1
        }]
    },
    options: {
        scales: {
            yAxes: [{
                ticks: {
                    beginAtZero:true
                }
            }]
        }
    }
});

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