[Chartjs]-Chart.js – Hover labels to display data for all data points on x-axis

For Chart.js 3.3.2, you can use @baburao’s approach with a few changes. You can check the documentation. Put tooltip in plugins. Example:

...
options: {
    plugins: {
        tooltip: {
            mode: 'nearest',
            intersect: false
        }
    }
}
...

I know this is an old post, but in a time I needed to divide a bar on multiple datasets, but the labels to be keeped as original values:

eg:

dataset 1: Totals: 10 15 10 
dataset 2: Red: 4 5 9 
dataset 3: Blue: 4 2 1

In my chart I want to show the "Totals" bar and to collor a part of it in red/blue or "the rest" (which is Totals color). I’ll don’t write the code to modify the datasets, but I’ll complete @busterroni answer for chartjs v3+

plugins: {
   tooltip: {
     mode: 'index',
     intersect: false,
     callbacks: {
       label: (item) => item.dataset.label + ': ' + 
          this.originalValues[item.datasetIndex].data[item.dataIndex]
     }
   }
}

You can achieve this after plotting the data like this:
Html

<div class="container">
  <h2>Chart.js — Line Chart Demo</h2>
  <div>
    <canvas id="myChart"></canvas>
  </div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.1.4/Chart.min.js"> 
</script>

CSS

.container {
  width: 80%;
  margin: 15px auto;
}

Javascript

var ctx = document.getElementById('myChart').getContext('2d');
function convert(str) {
  var date = new Date(str),
    mnth = ("0" + (date.getMonth() + 1)).slice(-2),
    day = ("0" + date.getDate()).slice(-2);
  return [date.getFullYear(), mnth, day].join("-");
}
var date = ["Tue Jun 25 2019 00:00:00 GMT+0530 (India Standard Time)"];
 var y1 = [12];
 var y2 = [32];
 var y3 = [7];
var dataPoints1 = [], dataPoints2 = [], dataPoints3 = [], datep=[];
console.log(date.length)
if(date.length=="1"){
var myChart = new Chart(ctx, {
  type: 'line',
  data: {
    labels: ["",convert(date[0]),""],
    datasets: [{
      label:"Tweets",
      backgroundColor: "rgba(153,255,51,0.4)",
      fill:false,
      borderColor:"rgba(153,255,51,0.4)",
      data: [null,y1[0],null]
    }, {
      label:"Retweets",
      backgroundColor: "rgba(255,153,0,0.4)",
      fill:false,
      borderColor:"rgba(255,153,0,0.4)",
      data: [null,y2[0],null]
    },{
      label:"Favourites",
      backgroundColor: "rgba(197, 239, 247, 1)",
      fill:false,
      borderColor:"rgba(197, 239, 247, 1)",
      data:[null,y3[0],null]
      }
      ]
  },
  options: {
         scales: {
            xAxes: [{
               gridLines: {
                  display: false
               }
            }],
            yAxes: [{
               ticks: {
                  display: true
               },
               gridLines: {
                  display: false,
               // drawBorder: false //maybe set this as well
               }
            }]
         },
        }
});}
else{
for (var i = 0; i < date.length; i++) {
  datep.push(convert(date[i]))
  dataPoints1.push(y1[i]); 
  dataPoints2.push(y2[i]); 
  dataPoints3.push(y3[i]); 
}
console.log(datep)
var myChart = new Chart(ctx, {
  type: 'line',
  data: {
    labels: datep,
    datasets: [{
      label:"Tweets",
      backgroundColor: "rgba(153,255,51,0.4)",
      fill:false,
      borderColor:"rgba(153,255,51,0.4)",
      data: dataPoints1
    }, {
      label:"Retweets",
      backgroundColor: "rgba(255,153,0,0.4)",
      fill:false,
      borderColor:"rgba(255,153,0,0.4)",
      data: dataPoints2
    },{
      label:"Favourites",
      backgroundColor: "rgba(197, 239, 247, 1)",
      fill:false,
      borderColor:"rgba(197, 239, 247, 1)",
      data:dataPoints3
      }
      ]
  },
  options: {
         scales: {
            xAxes: [{
               gridLines: {
                  display: false
               }
            }],
            yAxes: [{
               ticks: {
                  display: true
               },
               gridLines: {
                  display: false,
               // drawBorder: false //maybe set this as well
               }
            }]
         },
        }
});
}

or chk this fiddle https://jsfiddle.net/gqozfb4L/

I use "chart.js": "^4.2.1"
and this works for me:

...
options: {
    plugins: {
        tooltip: {
            mode: 'x',
            intersect: false
        }
    }
}
...

mode: ‘nearest’
will not work because it will show only the nearset point and not all the points for the specific x-axis

You could try using JavaScript to track the users mouse and based on the position, return the data at that vertice.

document.querySelector('.button').onmousemove = (e) => {
  const x = e.pageX - e.target.offsetLeft
  const y = e.pageY - e.target.offsetTop
  e.target.style.setProperty('--x', `${ x }px`)
  e.target.style.setProperty('--y', `${ y }px`)
 
}