[Chartjs]-Chart.js beginAtZero doesn't work

It looks like you are using Chart.js v1 instead of v2.

First, update your the Chart.js code to v2, preferably the latest version.

Then, change the following code:

var barGraph = new Chart(ctx, {
    type: 'bar',
    data: chartdata
    options: options
});

to:

var barGraph = Chart.Bar(ctx, {
  data: chartdata,
  options: options
});

beginAtZero: true should then work as expected.

Working JSFiddle: https://jsfiddle.net/ko54hp6n/

For an alternative to beginAtZero: true, you can also use the min: 0 ticks configuration option to start the bar axis at zero:

var options = {
  scales: {
    yAxes: [{
      ticks: {
        min: 0
      }
    }]
  }
}

Working JSFiddle: https://jsfiddle.net/ko54hp6n/1/