[Chartjs]-Chart JS – Use time for xAxes

22👍

✅

Since you wish to use time for x-axis, your labels array should be an array of date/time string (labels array is correspondent to x-axis).

You would also need to set the parser property (to parse the date/time correctly), and x-axis’ ticks source to data (to properly generate x-axis ticks).

UPDATE

If you only have a min and max date then, you can create a nice little plugin to populate the labels (date) array dynamically, as such :

plugins: [{
   beforeInit: function(chart) {
      var time = chart.options.scales.xAxes[0].time, // 'time' object reference
         // difference (in days) between min and max date
         timeDiff = moment(time.max).diff(moment(time.min), 'd');
      // populate 'labels' array
      // (create a date string for each date between min and max, inclusive)
      for (i = 0; i <= timeDiff; i++) {
         var _label = moment(time.min).add(i, 'd').format('YYYY-MM-DD HH:mm:ss');
         chart.data.labels.push(_label);
      }
   }
}]

^{note: moment.js is used to make calculations easier.}

ᴡᴏʀᴋɪɴɢ ᴇxᴀᴍᴘʟᴇ ⧩
^{( for demonstration purposes, I’ve changed the time unit to day )}

$(document).ready(function() {

   new Chart(document.getElementById("chartBox"), {
      type: 'line',
      data: {
         datasets: [{
            data: [12, 19, 3, 5, 2, 3, 32, 15],
            label: "",
            borderWidth: 2,
            borderColor: "#3e95cd",
            fill: false,
            pointRadius: 0
         }]
      },
      options: {
         scales: {
            xAxes: [{
               type: 'time',
               time: {
                  parser: 'YYYY-MM-DD HH:mm:ss',
                  unit: 'day',
                  displayFormats: {
                     day: 'ddd'
                  },
                  min: '2017-10-02 18:43:53',
                  max: '2017-10-09 18:43:53'
               },
               ticks: {
                  source: 'data'
               }
            }]
         },
         legend: {
            display: false
         },
         animation: {
            duration: 0,
         },
         hover: {
            animationDuration: 0,
         },
         responsiveAnimationDuration: 0
      },
      plugins: [{
         beforeInit: function(chart) {
            var time = chart.options.scales.xAxes[0].time, // 'time' object reference
               timeDiff = moment(time.max).diff(moment(time.min), 'd'); // difference (in days) between min and max date
            // populate 'labels' array
            // (create a date string for each date between min and max, inclusive)
            for (i = 0; i <= timeDiff; i++) {
               var _label = moment(time.min).add(i, 'd').format('YYYY-MM-DD HH:mm:ss');
               chart.data.labels.push(_label);
            }
         }
      }]
   });

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/moment@latest/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.0/Chart.min.js"></script>

<canvas id="chartBox"></canvas>

[Chartjs]-How do I place a new line in a label with Chart.js?

7👍

The dataset should be an array of objects with properties x for time and y for value.

$(document).ready(function() {
  var data = [{
      x: new moment().add(-10, "months"),
      y: Math.random() * 100
    },
    {
      x: new moment().add(-8, "months"),
      y: Math.random() * 100
    },
    {
      x: new moment().add(-6, "months"),
      y: Math.random() * 100
    },
    {
      x: new moment().add(-4, "months"),
      y: Math.random() * 100
    },
    {
      x: new moment().add(-2, "months"),
      y: Math.random() * 100
    },
    {
      x: new moment().add(-0, "months"),
      y: Math.random() * 100
    },
  ];

  new Chart(document.getElementById("chartBox"), {
    type: 'line',
    data: {
      datasets: [{
        data: data,
        borderColor: "#3e95cd",
        fill: false
      }]
    },
    options: {
      scales: {
        xAxes: [{
          type: 'time'
        }]
      },
      legend: false
    }
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.0/Chart.bundle.min.js"></script>

<canvas id="chartBox"></canvas>

Fiddle

[Chartjs]-How do I place a new line in a label with Chart.js?

3👍

If the xAxis label is in date format use this code

time: 
     {
         format: 'MM',
         unit: 'month',
         displayFormats: { month: 'MM' },
         max: '2017-10-09 18:43:53',
         min: '2017-10-02 18:43:53'
     }

If the xAxis label is as what u used numerals use

 time:
      {
         format: 'MM',
         unit: 'month',
         parser:'MM',
         displayFormats: { month: 'MM' },
         max: '2017-10-09 18:43:53',
         min: '2017-00-02 18:43:53'
      }