How to modify chartjs tooltip so i can add customized strings in tooltips

Question

How do i edit chartjs tooltip to add customized strings in tooltips

For Example: I want to change the Tooltip like "January: 28 Files" or just "28 Files"

Answer 1

Validated answer doesn't work anymore. For Chart.js V2,

Chart.defaults.global.tooltipTemplate

is deprecated.

Instead you can use callbacks to modify the displayed tooltips. There is a sample for the usage the possible callbacks in the documentation under Chart.defaults.global.tooltips.

In your case I would do the following:

window.myLine = new Chart(chart, {
    type: 'bar',
    data: barChartData,
    options: {
            tooltips: {
                enabled: true,
                mode: 'single',
                callbacks: {
                    label: function(tooltipItems, data) { 
                        return tooltipItems.yLabel + ' : ' + tooltipItems.xLabel + " Files";
                    }
                }
            },
     }       
  });

Don't forget to set the HTML meta tag:

<meta charset="UTF-8">

This answer was copy from this question.