CODEWITHSUNDEEP
chart.jshiddenpie-chart
Lavandysh
Lavandysh

Reputation: 571

How to hide section in a Chart.js Pie Chart

In Chart.js you can hide a section of a chart by clicking on the label on top.
enter image description here
picture of a pie chart with hidden section

I want a section of the chart to be hidden on startup. With another type of chart I would use the dataset hidden property, but pie chart sections do not correspond with the datasets. So if you do the same the entire dataset is hidden, not just the needed section.

(Extra information: I use a pie chart with multiple datasets)

The closest I have come to a solution is this code:

for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
  meta = chart.getDatasetMeta(i);
  meta.data[index].hidden = !meta.data[index].hidden;
}

chart.update();

Or I could overwrite the generateLabels function.

Can anyone help me find a better solution?

Thank you

Upvotes: 5

Views: 12906

Answers (5)

robinElli
robinElli

Reputation: 31

In V3 of chartjs you can use the API they provide to toggle the visibility of an item.

chart.toggleDataVisibility(2); // toggles the item in all datasets, at index 2
chart.update(); // chart now renders with item hidden

Note: Only doughnut / pie, polar area, and bar use this.

Upvotes: 3

MangaD
MangaD

Reputation: 325

None of the answers provided here have worked for Chart.js version 3.2.1 (what I am using). Here is what I came up with (and it works):

let ctx = document.getElementById('myChart').getContext('2d');

window.chart = new Chart(ctx, {
  type: 'pie',
  data: {
    labels: ['Red', 'Orange', 'Yellow', 'Green', 'Blue'],
    datasets: [{
      data: [100, 100, 200, 300, 140],
      backgroundColor: ['rgb(255, 99, 132)', 'rgb(255, 159, 64)', 'rgb(255, 205, 86)', 'rgb(75, 192, 192)', 'rgb(54, 162, 235)'],
      hoverOffset: 6,
    }]
  },
  options: {
    layout: { padding: 10 },
    responsive: true,
    maintainAspectRatio: true,
    plugins: {
      title: {
        display: true,
        text: 'Colors - Sample Pie Chart'
      }
    }
  }
});

toggleData('red');

window.chart.render();

function toggleData(txt) {

    let ci = window.chart;
    let legendItems = ci.legend.legendItems;
    let index;
    for (index = 0; index < legendItems.length; ++index) {
        let legendItem = legendItems[index];
        if (legendItem.text.toLowerCase() === txt.toLowerCase()) {
            // let visible = chart.getDataVisibility(index);
            ci.toggleDataVisibility(index);
            ci.update();
            return;
        }
    }
}
/*
Note: Do not style the canvas element. See:
https://github.com/chartjs/Chart.js/issues/9089
*/
#myChartContainer {
  width:400px;
  height:400px;
}
<div id="myChartContainer">
  <canvas id="myChart"></canvas>
</div>

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/chart.min.js"
        integrity="sha256-uVEHWRIr846/vAdLJeybWxjPNStREzOlqLMXjW/Saeo=" crossorigin="anonymous"></script>

References:

Upvotes: 4

uminder
uminder

Reputation: 26150

After creating the chart, you can retrieve its metadata through .getDatasetMeta(index), change the hidden attribute of the desired slice and update the chart as shown in the following code snippet. When the user clicks on the label of the hidden slice, it will become visible again.

const chart = new Chart(document.getElementById('myChart'), {
  type: 'pie',
  data: {
    labels: ['Red', 'Orange', 'Yellow', 'Green', 'Blue'],
    datasets: [{
      data: [100, 100, 200, 300, 140],
      backgroundColor: ['rgb(255, 99, 132)', 'rgb(255, 159, 64)', 'rgb(255, 205, 86)', 'rgb(75, 192, 192)', 'rgb(54, 162, 235)']
    }]
  },
  options: {
    responsive: true,
    maintainAspectRatio: true,
    title: {
      display: true,
      text: 'Colors - Sample Pie Chart'
    }
  }
});

chart.getDatasetMeta(0).data[4].hidden = true;    
chart.update();
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="myChart" height="150"> </canvas>

Upvotes: 4

Irfandy J.
Irfandy J.

Reputation: 1454

Update - 17/Nov/2019

Don't do this, at the time I wrote this I was new to ChartJS and Web Development as well and it seems that the solution above already outdated, so I tried to answer with things that works for me. Maybe it's already outdated too, I haven't used ChartJS much since then. I moved to Echarts.

Since @xnakos answer is already outdated, I just wanted to share the same thing can be done easier in the current ChartJS version (2.7.3). Simply set the values to undefined, setting it to other values such as null will leave the legends being seen (or not crossed).

var ctx = document.getElementById("myDoughnut").getContext("2d");
var myChart = new Chart(ctx, {
  type: 'doughnut',
  data: {
    labels: ["Red", "Green", "Blue"],
    datasets: [{
      label: '# of Votes',
      data: [12, 19, undefined],
      // Set this value to undefined
      backgroundColor: [
        '#f87979',
        '#79f879',
        '#7979f8'
      ],
      borderWidth: 5
    }]
  },
  options: {
    tooltips: {
      mode: null
    },
    plugins: {
      datalabels: {
        borderWidth: 5,
        borderColor: "white",
        borderRadius: 8,
        // color: 0,
        font: {
          weight: "bold"
        },
        backgroundColor: "lightgray"
      }
    }
  }
});
<div id="app">
  <div width="400">
    <canvas id="myDoughnut"></canvas>
  </div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/chartjs-plugin-datalabels.js"></script>

<!-- Made in 21 Nov 2018 -->
<!-- with ChartJS 2.7.3 -->

Here's a link to JSFiddle, for you to play around. http://jsfiddle.net/irfandyjip89/fokbgnvz/5/

However, must be noted, if you're using datasets on Pie/Doughnut, it's better to set it into null. Because one undefined value in any of the dataset will cross the legends.

But if you do set one undefined values on any of the dataset, it will result in the legends being crossed (or strikethrough). EVEN WHEN THERE'S A VALUE ON THE NEXT DATASET.

This means that if you only use one dataset, and you don't want the data being shown in the chart and getting the legends crossed you want to set the values to undefined. Whereas, null values will get you same result without the legends being crossed.

However it's preference on how the Chart should appear, but personally I would want to use undefined values if I would like to cross the legends (usually on one dataset chart)and hide the data, and will use null values if I would like to just hide the data without getting the legends crossed (usually on multiple dataset chart).

If you want to check how it went when playing with multiple datasets, you can check this fiddle http://jsfiddle.net/irfandyjip89/fokbgnvz/19/

P.S. If you're wondering how did I put a label value on the center, it's using a plugin called chartjs-plugin-datalabels

Upvotes: 2

xnakos
xnakos

Reputation: 10196

You may see an implementation as a plugin here and below.

// A plugin that hides slices, given their indices, across all datasets.
var hideSlicesPlugin = {
  afterInit: function(chartInstance) {
    // If `hiddenSlices` has been set.
    if (chartInstance.config.data.hiddenSlices !== undefined) {
      // Iterate all datasets.
      for (var i = 0; i < chartInstance.data.datasets.length; ++i) {
        // Iterate all indices of slices to be hidden.
        chartInstance.config.data.hiddenSlices.forEach(function(index) {
          // Hide this slice for this dataset.
          chartInstance.getDatasetMeta(i).data[index].hidden = true;
        });
      }
      chartInstance.update();
    }
  }
};

Chart.pluginService.register(hideSlicesPlugin);

var ctx = document.getElementById("myChart");

var myChart = new Chart(ctx, {
  type: 'pie',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
      data: [15, 1, 1, 1, 45, 1],
      backgroundColor: [
        'rgba(255, 99, 132, 0.2)',
        'rgba(54, 162, 235, 0.2)',
        'rgba(255, 206, 86, 0.2)',
        'rgba(75, 192, 192, 0.2)',
        'rgba(153, 102, 255, 0.2)',
        'rgba(255, 159, 64, 0.2)'
      ],
      borderColor: [
        'rgba(255,99,132,1)',
        'rgba(54, 162, 235, 1)',
        'rgba(255, 206, 86, 1)',
        'rgba(75, 192, 192, 1)',
        'rgba(153, 102, 255, 1)',
        'rgba(255, 159, 64, 1)'
      ],
      borderWidth: 1
    }, {
      data: [5, 1, 25, 10, 5, 1],
      backgroundColor: [
        'rgba(255, 99, 132, 0.2)',
        'rgba(54, 162, 235, 0.2)',
        'rgba(255, 206, 86, 0.2)',
        'rgba(75, 192, 192, 0.2)',
        'rgba(153, 102, 255, 0.2)',
        'rgba(255, 159, 64, 0.2)'
      ],
      borderColor: [
        'rgba(255,99,132,1)',
        'rgba(54, 162, 235, 1)',
        'rgba(255, 206, 86, 1)',
        'rgba(75, 192, 192, 1)',
        'rgba(153, 102, 255, 1)',
        'rgba(255, 159, 64, 1)'
      ],
      borderWidth: 1
    }],
    // Hide the second (index = 1) and the fourth (index = 3) slice.
    hiddenSlices: [1, 3]
  }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js"></script>
<canvas id="myChart" width="400" height="400"></canvas>

The slices to be hidden are provided using the hiddenSlices attribute, which should be an array of indices corresponding to existing slices. The slices are hidden across all datasets using the hideSlicesPlugin, if hiddenSlices has been set.

Upvotes: 6

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