CODEWITHSUNDEEP
chart.jsvue-chartjs
claudios
claudios

Reputation: 6656

Set fix values on y-axis vue-chartjs

I use vue-chartjs as a wrapper for chartjs. I had a simple line chart with random data but stuck on how to set fix value to be displayed on the chart's y-axis. Currently I have random data from 0-100. Now, what I want to achieve is just display 0, 50, 100 on the y-axis no matter what the random value is starts from 0-100.

Sample Script

putData: function () {
    this.datacollection = {
        labels: ['JAN', 'FEB', 'MAR', 'APR', 'MAY', 'JUN', 'JUL', 'AUG', 'SEP', 'OCT', 'NOV', 'DEC'],
        datasets: [{
            lineTension: 0,
            borderWidth: 1,
            borderColor: '#F2A727',
            pointBackgroundColor:[ '#fff', '#fff', '#fff', '#fff', '#fff', '#F2A727'],
            backgroundColor: 'transparent',
            data: [this.getRandomInt(), this.getRandomInt(), this.getRandomInt(), this.getRandomInt(), this.getRandomInt(), this.getRandomInt()]
        }]
    }
},

getRandomInt: function () {
    return Math.floor(Math.random() * (95)) + 5
}

Any help would be much appreciated.

Upvotes: 1

Views: 5579

Answers (2)

Jürgen Fink
Jürgen Fink

Reputation: 3545

Above answer is correct. For those intereseted, I post code for latest version of Chart.js

Updated to Chart.js v3.2.0 (not backwards-compatible with v2.xx)

In order to avoid automatic scaling if your random data values are all in the middle range close to 50, do the following:

Add min: 0 and max: 100 , so you force chart to show exactly those 3 ticks including the 0, hence maxTicksLimit: 3:

100

50

0

<script>
   // ...

options: {
   scales: {
      y: {
         min: 0,
         max: 150,
         ticks: {
            stepSize: 50,
            maxTicksLimit: 3
         }
      }
   }
};

   // ...
</script>

Source: https://www.chartjs.org/docs/latest/axes/#tick-configuration

(Be aware that in new versions v3.xx min: 0 and max: 100 are now located outside the ticks-object, whereas in v2.xx it used to be inside the ticks-object).

Upvotes: 2

ɢʀᴜɴᴛ
ɢʀᴜɴᴛ

Reputation: 32889

To achieve that, you need to set stepSize: 50 and maxTicksLimit: 3 for y-axis ticks, in your chart options :

scales: {
   yAxes: [{
      ticks: {
         stepSize: 50,
         maxTicksLimit: 3
      }
   }]
}

Upvotes: 5

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