Question

111

How to disable a tooltip for a specific dataset in ChartJS

rated 0 times [ 118] [ 7] / answers: 1 / hits: 20732 / 7 Years ago, thu, march 30, 2017, 12:00:00

I displaying a chart where two types are included. Now I want to hide the toolbar for one dataset. I saw some discussion like this on GitHub, but this doesn't bring me further.

Here is an example of my Chart:

Chart.defaults.global.legend.display = false;

var ctx = document.getElementById(chart).getContext(2d);

var data = {

  labels: [Januar,Februar,März,April,Mai,Juni,Juli,August,September,Oktober,November,Dezember],

  datasets: [

     {

       label: Test,

       type: 'bar',

       backgroundColor: #F29220,

       borderColor: #F29220,

       data: [4,1,1,2,2,2,2,2,2,2,2,1]

     },

     {

       label: Test2,

       type: 'bar',

       backgroundColor: #F29220,

       borderColor: #F29220,

       data: [4,0,0,0,0,0,0,0,0,0,0,0]

     },

     {

       label: ,

       type: 'line',

       fillColor: rgba(220,220,220,0),

       pointColor: rgba(220,220,220,0),

       borderColor: #FF0000,

       tooltip: false,

       data: [100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100]

     }]

  };

  var myBarChart = new Chart(ctx, {

    type: 'bar',

    data: data,

    options: {

       scales: {

          xAxes: [{

             stacked: true,

             ticks: {

                fontColor: '#000',

             }

          }],

          yAxes: [{

             stacked: true,

             ticks: {

                beginAtZero: true,

                fontColor: '#000',

                callback: function(label, index, labels) {

                   return label + '%';

                }

             },

          }]

       },

       elements: {

          point:{

             radius: 0

          }

       },

       tooltips: {

          enabled: true,

          mode: 'single',

          callbacks: {

             label: function(tooltipItems, data) {

                 return data.datasets[tooltipItems.datasetIndex].label + ': ' + tooltipItems.yLabel + ' %';

          }

       }

    }

 }

 });

<script src=https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js></script>

<canvas id=chart width=740 height=370></canvas>

How can I hide the tooltip just for the line chart? As you can see in the code, I already tried to insert the attribute tooltip, but this doesn't work.

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ansleyk

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2 Years ago

answered 7 Years ago brodyfrancisi · Accepted Answer

As you already concluded, there isn't a way to configure chart.js out of the box to only show tooltips of specific datasets. However, you can use the plugin interface to create a plugin that can provide this functionality.

Here is a plugin that I created for your scenario that let's you configure which datasets you want the tooltip to display for.

Chart.plugins.register({

  // need to manipulate tooltip visibility before its drawn (but after update)

  beforeDraw: function(chartInstance, easing) {

    // check and see if the plugin is active (its active if the option exists)

    if (chartInstance.config.options.tooltips.onlyShowForDatasetIndex) {

      // get the plugin configuration

      var tooltipsToDisplay = chartInstance.config.options.tooltips.onlyShowForDatasetIndex;



      // get the active tooltip (if there is one)

      var active = chartInstance.tooltip._active || [];



      // only manipulate the tooltip if its just about to be drawn

      if (active.length > 0) {

        // first check if the tooltip relates to a dataset index we don't want to show

        if (tooltipsToDisplay.indexOf(active[0]._datasetIndex) === -1) {

          // we don't want to show this tooltip so set it's opacity back to 0

          // which causes the tooltip draw method to do nothing

          chartInstance.tooltip._model.opacity = 0;

        }

      }

    }

  }

});

With the new plugin in place, you can now use a new property in the tooltips config called onlyShowForDatasetIndex that accepts an array of dataset indexes that the tooltip should display for.

tooltips: {

  enabled: true,

  mode: 'single',

  // new property from our plugin

  // configure with an array of datasetIndexes that the tooltip should display for

  // to get the datasetIndex, just use it's position in the dataset [] above in the data property

  onlyShowForDatasetIndex: [0, 1],

  callbacks: {

    label: function(tooltipItems, data) {

      return data.datasets[tooltipItems.datasetIndex].label + ': ' + tooltipItems.yLabel + ' %';

    }

  }

}

Where the index value maps to the position of the dataset in the datasets property.

Take a look at this codepen to see this in action. Notice the tooltips only show on the bar charts but not the line (since we did not include this dataset in the new configuration property).