CODEWITHSUNDEEP
javascriptchart.js
Umair Qazi
Umair Qazi

Reputation: 385

How to remove some points in chartjs

I have to hide / remove all data points except the second last point as shown in this image I have searched everywhere but couldn't find the proper solution to achieve this. 

myChart.datasets[0].points[0].display = false;
legStretchtCtx.update();

Above snippet is for Chart.js Version 1.0 but I'm using Chart.js Version: 2.7.1 . I have used this snippet but its giving an error:

Cannot read property '0' of undefined

var legStretchtCtx = document.getElementById("leg-stretch-chart");
          // var legStretch =
          var myChart = new Chart(legStretchtCtx, {
              type: 'line',
              data: {
                  labels: ["Day 1", "Day 2", "Day 3", "Day 4", "Day 5", "Day 6","Day 7"],
                  datasets: [{
                      label: 'Leg Stretch',
                      data: [3, 4, 5, 4, 3, 3.5, 3.5],
              				backgroundColor:"#70d6db",
                      borderColor: ["#70d6db"],
                      borderWidth: 4,
                      pointBackgroundColor: "#fff",
                      pointRadius: 8,
                      pointHoverRadius: 8,
      				        pointHoverBackgroundColor: "#0ba8b0",
                      pointHoverBorderColor: "#26c1c9",
      				        pointBorderColor:"#26c1c9"

                  }]
              },
              options: {
                  legend: {
                      display: false,
                      labels: {
                          display: true
                      }
                  },
      			responsive:true,
                  scales: {
                      xAxes: [{
                          gridLines: {
                              display: false,
                              drawBorder:false,

                          },
                          ticks: {
                              display: false,
                              fontFamily: "Montserrat",
                              fontColor: "#2c405a",
      						fontSize: 12
                          }
                      }],
                      yAxes: [{
                          gridLines: {
                              display: false,
                              drawBorder:false,

                          },
                          ticks: {
      						display: false,
      						fontFamily: "Montserrat",
                              fontColor: "#2c405a",
                             	fontSize: 12,
      						stepSize:1,
                              min: 0,
                              max: 10,
      					}

                      }]
                  }
              }
          });
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.1/Chart.bundle.js"></script>
<div class="chart-container">
  <div class="leg-stretch-chart-inner">
    <canvas id="leg-stretch-chart" width="100%" height=""></canvas>
  </div>
</div>

Upvotes: 3

Views: 6122

Answers (3)

G0Ra
G0Ra

Reputation: 1

works on version 4.2.1 The code displays events as dots if the checkbox is pressed, otherwise, the graph is without dots.

labels - dates. datasets - the number of vacancies

const v = checkbox.value // getting the value from the checkbox
// where there are no events, we put 0, and where there are 10. 
// that is, we make either visible or invisible points
const points = labels.map(date => (date.events ? 10 : 0)) 
// if the checkbox is pressed, then we show points, otherwise we do not show any points
chart.data.datasets[0].pointRadius = v ? points : [] 
chart.update()

Upvotes: 0

Umair Qazi
Umair Qazi

Reputation: 385

 $( document ).ready(function() {
      //My Chart 1
      myChart1.data.datasets[0].pointRadius = [0, 0, 0, 0, 0, 8, 0];
        myChart1.update();
      //My Chart 2
      myChart2.data.datasets[0].pointRadius = [0, 0, 0, 0, 0, 8, 0];
        myChart2.update();         
    });

Upvotes: 0

Gustavo F
Gustavo F

Reputation: 2206

First, change pointRadius to array:

pointRadius: [8, 8, 8, 8, 8, 8, 8]

Then, you have to rewrite this array with specific values for each point (in our case, the second last pont) and update:

$("#btnRemovePoints").click(function()
{
    //change the radius of every point except one
    myChart.data.datasets[0].pointRadius = [0, 0, 0, 0, 0, 8, 0];
    myChart.update();
});

More details in this fiddle: https://jsfiddle.net/s7m1961t/

Upvotes: 5

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