Show JS Chart HTML in Tooltip

Question

I struggled with the Chart JS documentation, trying to figure out how to change the contents of a tooltip of a line chart tool when I hover over a specific point.

Basically, I want to display values ​​on the same vertical axis whenever one point freezes. I tried something like this:

tooltips: {
    callbacks: {
        label: function(tooltipItem, data){
            console.log(data);
            var html = "";
            for(var dataset in data.datasets){
                html += "<label>" + data.datasets[dataset].label + ": " + data.datasets[dataset].data[tooltipItem.index] + "%</label><br/>";
            }
            return html;
        }
    },
},

This works with the degree of cyclization of each dataset and the addition <label>Example: 0%<br/></label>for each dataset, but when I return this HTML, a tooltip literally displays a line:

<label>Example1: 1%</label><br/><label>Example2: 5%</label><br/> ...

Instead of displaying the correct HTML:

Example1: 1%
Example2: 5%
...

, Chart JS 1.0 tooltipTemplate, , HTML tooltips.callbacks.label. , , , , .

Answer 1

2.4, , , HTML. .

samples chart-js ( , ).

https://github.com/chartjs/Chart.js/tree/v2.4.0/samples/tooltips

, , .

, :

Chart.defaults.global.pointHitDetectionRadius = 1;
var customTooltips = function(tooltip) {
    // Tooltip Element
    var tooltipEl = document.getElementById('chartjs-tooltip');
    if (!tooltipEl) {
        tooltipEl = document.createElement('div');
        tooltipEl.id = 'chartjs-tooltip';
        tooltipEl.innerHTML = "<table></table>"
        document.body.appendChild(tooltipEl);
    }
    // Hide if no tooltip
    if (tooltip.opacity === 0) {
        tooltipEl.style.opacity = 0;
        return;
    }
    // Set caret Position
    tooltipEl.classList.remove('above', 'below', 'no-transform');
    if (tooltip.yAlign) {
        tooltipEl.classList.add(tooltip.yAlign);
    } else {
        tooltipEl.classList.add('no-transform');
    }
    function getBody(bodyItem) {
        return bodyItem.lines;
    }
    // Set Text
    if (tooltip.body) {
        var titleLines = tooltip.title || [];
        var bodyLines = tooltip.body.map(getBody);
        //PUT CUSTOM HTML TOOLTIP CONTENT HERE (innerHTML)
        var innerHtml = '<thead>';
        titleLines.forEach(function(title) {
            innerHtml += '<tr><th>' + title + '</th></tr>';
        });
        innerHtml += '</thead><tbody>';
        bodyLines.forEach(function(body, i) {
            var colors = tooltip.labelColors[i];
            var style = 'background:' + colors.backgroundColor;
            style += '; border-color:' + colors.borderColor;
            style += '; border-width: 2px'; 
            var span = '<span class="chartjs-tooltip-key" style="' + style + '"></span>';
            innerHtml += '<tr><td>' + span + body + '</td></tr>';
        });
        innerHtml += '</tbody>';
        var tableRoot = tooltipEl.querySelector('table');
        tableRoot.innerHTML = innerHtml;
    }
    var position = this._chart.canvas.getBoundingClientRect();
    // Display, position, and set styles for font
    tooltipEl.style.opacity = 1;
    tooltipEl.style.left = position.left + tooltip.caretX + 'px';
    tooltipEl.style.top = position.top + tooltip.caretY + 'px';
    tooltipEl.style.fontFamily = tooltip._fontFamily;
    tooltipEl.style.fontSize = tooltip.fontSize;
    tooltipEl.style.fontStyle = tooltip._fontStyle;
    tooltipEl.style.padding = tooltip.yPadding + 'px ' + tooltip.xPadding + 'px';
};

:

window.myLine = new Chart(chartEl, {
    type: 'line',
    data: lineChartData,
    options: {
        title:{
            display:true,
            text:'Chart.js Line Chart - Custom Tooltips'
        },
        tooltips: {
            enabled: false,
            mode: 'index',
            position: 'nearest',
            //Set the name of the custom function here
            custom: customTooltips
        }
    }
});

EDIT: , , . , , HTML ( ), . , , .