score:141

Accepted answer

Update: please see an updated answer from @DreamTeK that shows how this can now be done as part of the chartjs api https://stackoverflow.com/a/54006487/2737978

in chartjs 2.x you can pass an option for a userCallback to the yaxis tick field. In this you can check if the label is a whole number

here is an example 

 options = {
     scales: {
         yAxes: [{
             ticks: {
                 beginAtZero: true,
                 userCallback: function(label, index, labels) {
                     // when the floored value is the same as the value we have a whole number
                     if (Math.floor(label) === label) {
                         return label;
                     }

                 },
             }
         }],
     },
 }

fiddle example

score:0

if your chartjs version above 2.8 you can easily use precision: 0

study the below example

      responsive: true,
      maintainAspectRatio: false,
      title: {
        display: true,
        position: 'top',
        text: 'Monthly Establish Documents Value',
        fontSize: 25
      },
      scales: {
        xAxes: [
          {
            stacked: true,
            scaleLabel: {
              display: true,
              labelString: 'Months'
            }
          }
        ],

        yAxes: [
          {
            stacked: true,
            beginAtZero: true,
            id: 'A',
            scaleLabel: {
              display: true,
              labelString: '$AUD'
            }
          },
          {
            stacked: false,
            beginAtZero: true,
            id: 'B',
            gridLines: {
              display: false
            },
            scaleLabel: {
              display: true,
              labelString: '#Clients '
            },
            position: 'right',
            ticks: {
              min: 0,
              precision: 0
            }
          }
        ]
      }
    } ```

score:0

Chart.js v3 (2022+)

The most reliable way with Chart.js v3 is not to use ticks.precision, but instead provide your own formatter with ticks.callback.

Example on how to format y axis labels:

scales: {
  y: {
    ticks: {
      callback: (yValue) => {
        return Math.floor(yValue); // format to your liking
      },
    },
  },
}

Documentation: https://www.chartjs.org/docs/latest/samples/scale-options/ticks.html

score:1

You can yaxis optopn;

decimalsInFloat: Number

Number of fractions to display when there are floating values in y-axis. Note: If you have defined a custom formatter function in yaxis.labels.formatter, this won’t have any effect.

score:1

I use this:

yAxes: [
        {
            ticks: {
                    callback: function(val) {
                    return Number.isInteger(val) ? val : null;
                }
            }
        }
    ]

Note: use the callback function for better granular control. We check if val is an integer instead of a floating-point decimal. If it is, we return the value. If not, we return null.

score:4

The easiest and most straight forward solution is to add these configurations to your options object:

    scales: {
  yAxes: [
    {
      ticks: {
        precision: 0,
        beginAtZero: true,
      },
    },
  ],
},

and define the Axes (In my case it is the yAxes) depending on your axes with fractions

score:22

You can adding stepSize and beginAtZero option like this:

scales: {
  yAxes: [{
    ticks: {
      stepSize: 1,
      beginAtZero: true,
    },
  }],
},

score:32

Another alternative is to use the fixedStepSize option as follows:

options = {
    scales: {
        yAxes: [{
            ticks: {
                fixedStepSize: 1
            }
        }],
    },
};

score:87

2019 Update

This can now easily be achieved using the precision option:

ticks: {
  precision:0
}

As per the documentation.

If defined and stepSize is not specified, the step size will be rounded to this many decimal places.

EXAMPLE

options: {
  scale: {
    ticks: {
      precision: 0
    }
  }
}

OR (Single Axis)

options: {
  scales: {
    xAxes: [{
      ticks: {
        precision: 0
      }
    }]
  }
}

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