Develop Reference

Expose additional data based on xAxis element click - Highcharts.js

I'm facing some difficulties while trying to implement 'xAxis clickable' column chart. I'm trying to expose additional Pie charts below my column chart, based on user click on one of the element in xAxis.
The way the first graph is build:
function chartBuilder(data) {
if (data.length === 0) {
return null;
}
var categories = [];
var uniqData = [
{name : 'Fatal', data:[], color:'black', stack: 'fatal'},
{name : 'Critical', data:[], color:'red', stack: 'critical'},
];
_.each(data, function (item) {
categories = categories.concat(item.site);
var fatalValue = {};
fatalValue[item.site] = parseFloat(item.fatal || 0);
uniqData[0].data = uniqData[0].data.concat(fatalValue);
var criticalValue = {};
criticalValue[item.site] = parseFloat(item.critical || 0);
uniqData[1].data = uniqData[1].data.concat(criticalValue);
});
var chartConfig = util.basicConfigChart(categories, uniqData);
chartConfig.yAxis.title = {
text: 'Num Of Events'
};
chartConfig.xAxis.labels = {
formatter: function() {
var ret = this.value,
len = ret.length;
if (len > 10) {
ret = '<strong>' + ret.slice(0,ret.indexOf('_')) + '<br/>' + ret.slice(ret.indexOf('_') + 1, len) + '</strong>';
}
if (len > 25) {
ret = ret.slice(0,25) + '...';
}
return '<strong>' + ret + '</strong>';
},
useHTML: true
};
chartConfig.options.tooltip = {
formatter : function () {
return '<strong>' + this.series.name + '</strong>:' + this.point.y + '<br>Total: ' + this.point.total;
}
};
return chartConfig;
}
So basically, what I need is a way to determine which element in xAxis was clicked, and expose below pie charts with data relevant to this element.

If I understand you correctly, you want to add a click event on the xAxis columns. This can be done using a click event
events: {
click: function (event) {
alert(
'x index: ' + event.point.x + ', \n' +
'series.index: ' + event.point.series.index
);
}
}
This event can be added to a specific series, or to the plotOptions to affect all series.
The code above, will make an alert that shows the relevant indexes.
Working example: https://jsfiddle.net/ewolden/xr17pen6/6/
API on click event: https://api.highcharts.com/highcharts/series.column.events.click

Highcharts - tooltip time value does not match xAxis

I have a problem with a area chart that I have created.
The time in the tooltip does not correspond with the time on the xAxis (se image for example)
The time in the toolstip is right, the xAxis is however shifted two hours behind in time.
Settings for the chart (modified for brevity)
var chart = new Highcharts.Chart({
tooltip: {
dateTimeLabelFormats: {
day:"%A, %b %e, %Y, %H:%M"
},
formatter: function() {
var tt = '',
newDate = new Date(this.key).toLocaleString();
tt = '<b>' + newDate + ':</b> <br/>' + '<b>' + this.series.name + '</b>' + ': ' + this.y;
return tt;
}
},
xAxis: {
type: 'datetime'
}
});
This is how I draw the series:
for (var i = 0; i < newValue.length; i++) {
chart.series[0].addPoint([newValue[i].tValue, newValue[i].value], false, false);
}
newValue[i].tValue is in epoch, for example 1493097600000

In my case setting useUTC to false helped.
Highcharts.setOptions({
global: {
useUTC: false
}
});

Obtaining x-axis values in c3.js to customize the tooltip?

I'm trying to edit the tooltip in a c3 line-chart. Specifically, I need to access the current x-value within the chart.tooltip.format.value function. However, the function is not passed the x-value explicitly.
var chart = c3.generate({
tooltip: {
format: {
value: function (value, ratio, id, index) {
return value;
}
}
},
data: {
x: 'YEAR',
xFormat: '%Y',
url: myURL',
},
axis: {
x: {
type: 'timeseries',
tick: {
format: '%Y'
}
},
},
});

You can use the tooltip's contents property to create a custom tooltip, and in there you can access the X value via: d[0].x.
Edit: use d[0].x.getFullYear() to retrieve only the year part of the date (it's a time series so C3 internally stores the supplied year as a javascript date object)
Here's code I've taken from this discussion https://github.com/c3js/c3/issues/444, and modified:
function tooltip_contents(d, defaultTitleFormat, defaultValueFormat, color) {
var $$ = this, config = $$.config, CLASS = $$.CLASS,
titleFormat = config.tooltip_format_title || defaultTitleFormat,
nameFormat = config.tooltip_format_name || function (name) { return name; },
valueFormat = config.tooltip_format_value || defaultValueFormat,
text, i, title, value, name, bgcolor;
// You can access all of data like this:
//console.log($$.data.targets);
for (i = 0; i < d.length; i++) {
if (! (d[i] && (d[i].value || d[i].value === 0))) { continue; }
// to exclude
//if (d[i].name === 'data2') { continue; }
if (! text) {
title = 'MY TOOLTIP # ' + d[0].x.getFullYear(); // SHOW X-VALUE, year only (given it is a time series)
text = "<table class='" + CLASS.tooltip + "'>" + (title || title === 0 ? "<tr><th colspan='2'>" + title + "</th></tr>" : "");
}
name = nameFormat(d[i].name);
value = valueFormat(d[i].value, d[i].ratio, d[i].id, d[i].index);
bgcolor = $$.levelColor ? $$.levelColor(d[i].value) : color(d[i].id);
text += "<tr class='" + CLASS.tooltipName + "-" + d[i].id + "'>";
text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>" + name + "</td>";
text += "<td class='value'>" + value + "</td>";
text += "</tr>";
}
return text + "</table>";
}
var chart = c3.generate({
data: {
x: 'year',
xFormat: '%Y',
columns: [
['year', '1970', '1975', '1980', '1985', '1990'],
['data1', 100, 200, 150, 300, 200],
['data2', 400, 500, 250, 700, 300],
]
},
axis: {
x: {
type: 'timeseries',
tick: {
format: '%Y'
}
},
},
tooltip: {
contents: tooltip_contents
}
});
My fiddle, showing the current x-value: http://jsfiddle.net/w7h385h3/5/

Highcharts legend hiding wrong data

The legend in my highcharts is not functioning correctly. I have 2 series, each named differently. When I click on 'series1' on the legend, the data for 'series1' is hidden leaving 'series2' behind. However, when I click on 'series2' first, all the data is hidden instead of only 'series2'. What are some common mistakes that could lead to this? Here is a snippet of the involved code:
EDIT: Here is a jsFiddle reproduction of my bug. You can see when you click on "Pool" in the legend both series are removed. Clicking on client, however, works as expected. https://jsfiddle.net/LLExL/5616/
EDIT2: I found the solution. Apparently if the first index of a given series of data is empty, the error occurs. It also appears that it must have the same number of elements equal to the index with the least amount of data points. So in my case, I check if the first element in clientChartData or poolChartData is empty, if so I append 5 pairs of quotes to that array.
$('#all-cpus').highcharts({
chart: {
type: 'boxplot',
inverted: true
},
title: {
text: 'All CPUs'
},
xAxis: {
title: { text: 'Hybrids' }
},
yAxis: {
title: { text: 'Yield' }
},
legend: { enabled: true },
credits: { enabled: false },
tooltip: {},
plotOptions: {
boxplot: {
fillColor: '#6c3a38',
lineWidth: 3,
medianWidth: 3,
stemColor: '#DF5353',
stemDashStyle: 'dot',
stemWidth: 1,
whiskerColor: '#AAEEEE',
whiskerLength: '20%',
whiskerWidth: 3
}
},
series: [
{ name: 'Client' },
{ name: 'Pool' }
]
});
Here is where I set the chart data. Assume organizedClientData as all the data I need.
//Set the data to be displayed on the chart
clientChartData = organizedClientData;
$chart.highcharts().series[0].setData(clientChartData, false);
$chart.highcharts().series[0].update({name: this.clientData.name}, false);
$chart.highcharts().series[1].setData(poolChartData, false);
$chart.highcharts().series[1].update({name: this.poolData.name}, false);
//Set tooltip info to reflect dynamic data and to include acres
$chart.highcharts().tooltip.options.formatter = function() {
var index = this.point.x;
var numAcresPool = poolAcres[ index ];
var numAcresClient = clientAcres[ index ];
var tooltipString = this.point.category + '<br>' +
this.point.series.name + '<br>' +
'Max: ' + this.point.high + '<br>' +
'Upper Quartile: ' + this.point.q3 + '<br>' +
'Median: ' + this.point.median + '<br>' +
'Lower Quartile: ' + this.point.q1 + '<br>' +
'Min: ' + this.point.low + '<br>';
//Handle client vs. pool acreage display, and check if on the 'All Cpus' tab
if(this.point.series.name == 'Pool') {
tooltipString = tooltipString + 'Acres: ' + numAcresPool;
}
else if(this.point.series.name == 'All Farms' /*&& $chart.selector != '#all-cpus'*/) {
tooltipString = tooltipString + 'Acres: ' + numAcresClient;
}
return tooltipString;
};
var xaxis = $chart.highcharts().xAxis[0];
var title = { text: this.getProfileData().cropId == 1 ? 'Hybrids' : 'Varieties' };
xaxis.setCategories(categories, true);
xaxis.setTitle(title, true);
$chart.highcharts().setSize( $chart.parent().width() - 15, $chart.highcharts().xAxis[0].categories.length * 50 + 150 );
$chart.highcharts().redraw();

This looks like a bug, I reported that to our developers here: https://github.com/highcharts/highcharts/issues/4939

How to change tooltip content in c3js

I'm working on a timeline display and I have data that I want to show on the tooltip. currently it only shows the value at each time. and I cannot find a way to change it. the example below shows how to change the value's format but not what values are displayed
var chart = c3.generate({
data: {
columns: [
['data1', 30000, 20000, 10000, 40000, 15000, 250000],
['data2', 100, 200, 100, 40, 150, 250]
],
axes: {
data2: 'y2'
}
},
axis : {
y : {
tick: {
format: d3.format("s")
}
},
y2: {
show: true,
tick: {
format: d3.format("$")
}
}
},
tooltip: {
format: {
title: function (d) { return 'Data ' + d; },
value: function (value, ratio, id) {
var format = id === 'data1' ? d3.format(',') : d3.format('$');
return format(value);
}
//value: d3.format(',') // apply this format to both y and y2
}
}
});
it's taken from http://c3js.org/samples/tooltip_format.html
they do admit that there isn't an example for content editing but I couldn't find anything in the reference or forums, but a suggestion to change the code (it's here: https://github.com/masayuki0812/c3/blob/master/c3.js in line 300) and below:
__tooltip_contents = getConfig(['tooltip', 'contents'], function (d, defaultTitleFormat, defaultValueFormat, color) {
var titleFormat = __tooltip_format_title ? __tooltip_format_title : defaultTitleFormat,
nameFormat = __tooltip_format_name ? __tooltip_format_name : function (name) { return name; },
valueFormat = __tooltip_format_value ? __tooltip_format_value : defaultValueFormat,
text, i, title, value, name, bgcolor;
for (i = 0; i < d.length; i++) {
if (! (d[i] && (d[i].value || d[i].value === 0))) { continue; }
if (! text) {
title = titleFormat ? titleFormat(d[i].x) : d[i].x;
text = "<table class='" + CLASS.tooltip + "'>" + (title || title === 0 ? "<tr><th colspan='2'>" + title + "</th></tr>" : "");
}
name = nameFormat(d[i].name);
value = valueFormat(d[i].value, d[i].ratio, d[i].id, d[i].index);
bgcolor = levelColor ? levelColor(d[i].value) : color(d[i].id);
text += "<tr class='" + CLASS.tooltipName + "-" + d[i].id + "'>";
text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>" + name + "</td>";
text += "<td class='value'>" + value + "</td>";
text += "</tr>";
}
return text + "</table>";
})
did anyone attempted to do so? developed some function to facilitate the process? have any tips on how to do so correctly? I do not know how to change their code in a way I could use more data or data different than the d value the function gets.

If you use the function getTooltipContent from https://github.com/masayuki0812/c3/blob/master/src/tooltip.js#L27 and add it in the chart declaration, in tooltip.contents, you'll have the same tooltip content that the default one.
You can make changes on this code and customize it as you like. One detail, as CLASS is not defined in the current scope, but it's part chart object, I substituted CLASS for $$.CLASS, maybe you don't even need this Object in your code.
var chart = c3.generate({
/*...*/
tooltip: {
format: {
/*...*/
},
contents: function (d, defaultTitleFormat, defaultValueFormat, color) {
var $$ = this, config = $$.config,
titleFormat = config.tooltip_format_title || defaultTitleFormat,
nameFormat = config.tooltip_format_name || function (name) { return name; },
valueFormat = config.tooltip_format_value || defaultValueFormat,
text, i, title, value, name, bgcolor;
for (i = 0; i < d.length; i++) {
if (! (d[i] && (d[i].value || d[i].value === 0))) { continue; }
if (! text) {
title = titleFormat ? titleFormat(d[i].x) : d[i].x;
text = "<table class='" + $$.CLASS.tooltip + "'>" + (title || title === 0 ? "<tr><th colspan='2'>" + title + "</th></tr>" : "");
}
name = nameFormat(d[i].name);
value = valueFormat(d[i].value, d[i].ratio, d[i].id, d[i].index);
bgcolor = $$.levelColor ? $$.levelColor(d[i].value) : color(d[i].id);
text += "<tr class='" + $$.CLASS.tooltipName + "-" + d[i].id + "'>";
text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>" + name + "</td>";
text += "<td class='value'>" + value + "</td>";
text += "</tr>";
}
return text + "</table>";
}
}
});

If you want to control tooltip render and use default rendering depending on data value you can use something like this:
tooltip: {
contents: function (d, defaultTitleFormat, defaultValueFormat, color) {
if (d[1].value > 0) {
// Use default rendering
return this.getTooltipContent(d, defaultTitleFormat, defaultValueFormat, color);
} else {
return '<div>Show what you want</div>';
}
},
format: {
/**/
}
}

In my case i had to add the day for the date value(x axis) in tool tip. Finally i came came up with the below solution
References for js and css
https://code.jquery.com/jquery-3.2.1.js
https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js
https://cdnjs.cloudflare.com/ajax/libs/c3/0.4.10/c3.min.js
https://cdnjs.cloudflare.com/ajax/libs/c3/0.4.10/c3.min.css
function toDate(dateStr)
{
var numbers = dateStr.match(/\d+/g);
return new Date(numbers[0], numbers[1]-1, numbers[2]);
}
function GetMonthFromString(month)
{
var months = {'Jan' : '01','Feb' : '02','Mar':'03','Apr':'04',
'May':'05','Jun':'06','Jul':'07','Aug':'08','Sep':'09',
'Oct':'10','Nov':'11','Dec':'12'};
return months[month];
}
function GetFullDayName(formatteddate)
{
var weekday = new Array(7);
weekday[0] = "Sunday";
weekday[1] = "Monday";
weekday[2] = "Tuesday";
weekday[3] = "Wednesday";
weekday[4] = "Thursday";
weekday[5] = "Friday";
weekday[6] = "Saturday";
var dayofdate = weekday[formatteddate.getDay()];
return dayofdate;
}
//Chart Data for x-axis, OnHours and AvgHours
function CollectChartData()
{
var xData = new Array();
var onHoursData = new Array();
var averageHoursData = new Array();
var instanceOccuringDatesArray = ["2017-04-20","2017-04-21","2017-04-22","2017-04-23","2017-04-24","2017-04-25","2017-04-26","2017-04-27","2017-04-28","2017-04-29","2017-04-30","2017-05-01","2017-05-02","2017-05-03","2017-05-04","2017-05-05","2017-05-06","2017-05-07","2017-05-08","2017-05-09","2017-05-10","2017-05-11","2017-05-12","2017-05-13","2017-05-14","2017-05-15","2017-05-16","2017-05-17","2017-05-18","2017-05-19","2017-05-20"];
var engineOnHoursArray = ["4.01","14.38","0.10","0.12","0.01","0.24","0.03","6.56","0.15","0.00","1.15","0.00","1.21","2.06","8.55","1.41","0.03","1.42","0.00","3.35","0.02","3.44","0.05","5.41","4.06","0.02","0.04","7.26","1.02","5.09","0.00"];
var avgUtilizationArray = ["2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29","2.29"];
xData.push('x');
onHoursData.push('OnHours');
averageHoursData.push('Project Average');
for(var index=0;index<instanceOccuringDatesArray.length;index++)
{
xData.push(instanceOccuringDatesArray[index]);
}
for(var index=0;index<engineOnHoursArray.length;index++)
{
onHoursData.push(engineOnHoursArray[index]);
}
for(var index=0;index<avgUtilizationArray.length;index++)
{
averageHoursData.push(avgUtilizationArray[index]);
}
var Data = [xData, onHoursData, averageHoursData];
return Data;
}
function tooltip_contents(d, defaultTitleFormat, defaultValueFormat, color) {
var $$ = this, config = $$.config, CLASS = $$.CLASS,
titleFormat = config.tooltip_format_title || defaultTitleFormat,
nameFormat = config.tooltip_format_name || function (name) { return name; },
valueFormat = config.tooltip_format_value || defaultValueFormat,
text, i, title, value, name, bgcolor;
// You can access all of data like this:
//$$.data.targets;
for (i = 0; i < d.length; i++) {
if (! text) {
title = titleFormat ? titleFormat(d[i].x) : d[i].x;
var arr = title.split(" ");
var datestr = new Date().getFullYear().toString() + "-"+ GetMonthFromString(arr[1]) + "-"+ arr[0];
var formatteddate = toDate(datestr);
var dayname = GetFullDayName(formatteddate);
title = title + " (" + dayname + ")";
text = "<table class='" + $$.CLASS.tooltip + "'>" + (title || title === 0 ? "<tr><th colspan='2'>" + title + "</th></tr>" : "");
}
name = nameFormat(d[i].name);
var initialvalue = valueFormat(d[i].value, d[i].ratio, d[i].id, d[i].index);
if (initialvalue.toString().indexOf('.') > -1)
{
var arrval = initialvalue.toString().split(".");
value = arrval[0] + "h " + arrval[1] + "m";
}
else
{
value = initialvalue + "h " + "00m";
}
bgcolor = $$.levelColor ? $$.levelColor(d[i].value) : color(d[i].id);
text += "<tr class='" + CLASS.tooltipName + "-" + d[i].id + "'>";
text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>" + name + "</td>";
text += "<td class='value'>" + value + "</td>";
text += "</tr>";
}
return text + "</table>";
}
$(document).ready(function () {
var Data = CollectChartData();
var chart = c3.generate({
data: {
x: 'x',
columns: Data
},
axis: {
x: {
type: 'timeseries',
tick: {
rotate: 75,
//format: '%d-%m-%Y'
format: '%d %b'
}
},
y : {
tick : {
format: function (y) {
if (y < 0) {
}
return y;
}
},
min : 0,
padding : {
bottom : 0
}
}
},
tooltip: {
contents: tooltip_contents
}
});
});
<script src="https://code.jquery.com/jquery-3.2.1.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/c3/0.4.10/c3.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/c3/0.4.10/c3.min.css" rel="stylesheet" />
<div id="chart"></div>

When we have a stacked bar chart and we would like to show "Total" in the tooltip (but not in the chart as a bar/stack) this can come handy.
C3 charts use a array to store the data for tooltips and before the tooltips are displayed we are adding totals (or anyother data as per our requirement). By doing this though the totals is not available as a stack it is shown in the tooltip.
function key_for_sum(arr) {
return arr.value; //value is the key
};
function sum(prev, next) {
return prev + next;
}
var totals_object = {};
totals_object.x = d[0]['x'];
totals_object.value = d.map(key_for_sum).reduce(sum);
totals_object.name = 'total';
totals_object.index = d[0]['index'];
totals_object.id = 'total';
d.push(totals_object);
Above code has been added to ensure that total is available in
C3.js Stacked Bar chart's tooltip
var chart = c3.generate({
/*...*/
tooltip: {
format: {
/*...*/
},
contents: function (d, defaultTitleFormat, defaultValueFormat, color) {
function key_for_sum(arr) {
return arr.value; //value is the key
}
function sum(prev, next) {
return prev + next;
}
var totals_object = {};
totals_object.x = d[0]['x'];
totals_object.value = d.map(key_for_sum).reduce(sum);// sum func
totals_object.name = 'total';//total will be shown in tooltip
totals_object.index = d[0]['index'];
totals_object.id = 'total';//c3 will use this
d.push(totals_object);
var $$ = this,
config = $$.config,
titleFormat = config.tooltip_format_title || defaultTitleFormat,
nameFormat = config.tooltip_format_name || function (name) {
return name;
},
valueFormat = config.tooltip_format_value || defaultValueFormat,
text, i, title, value, name, bgcolor;
for (i = 0; i < d.length; i++) {
if (!(d[i] && (d[i].value || d[i].value === 0))) {
continue;
}
if (!text) {
title = titleFormat ? titleFormat(d[i].x) : d[i].x;
text = "<table class='" + $$.CLASS.tooltip + "'>" + (title || title === 0 ? "<tr><th colspan='2'>" + title + "</th></tr>" : "");
}
name = nameFormat(d[i].name);
value = valueFormat(d[i].value, d[i].ratio, d[i].id, d[i].index);
bgcolor = $$.levelColor ? $$.levelColor(d[i].value) : color(d[i].id);
text += "<tr class='" + $$.CLASS.tooltipName + "-" + d[i].id + "'>";
text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>" + name + "</td>";
text += "<td class='value'>" + value + "</td>";
text += "</tr>";
}
return text + "</table>";
}
}

Adding additional content or non-numerical data into the chart tooltips can be done.
This builds on #supita's excellent answer http://stackoverflow.com/a/25750639/1003746.
Its possible to insert additional metadata about each line into the classes parameter when generating/updating the chart. These can then be added as rows to the tooltip.
This doesn't seem to affect the chart - unless you are using the data.classes feature.
data: {
classes: {
data1: [{prop1: 10, prop2: 20}, {prop1: 30, prop2: 40}],
data2: [{prop1: 50, prop2: 60}'{prop1: 70, prop2: 80}]
}
}
To pick up the metadata in the config.
tooltip: {
contents: function (d, defaultTitleFormat, defaultValueFormat, color) {
const $$ = this;
const config = $$.config;
const meta = config.data_classes;
...
for (i = 0; i < d.length; i++) {
if (! (d[i] && (d[i].value || d[i].value === 0))) { continue; }
if (! text) {
...
}
const line = d[0].id;
const properties = meta.classes[line];
const property = properties? properties[i] : null;
Then add the following rows to the table to show the new properties.
if (property ) {
text += "<tr class='" + $$.CLASS.tooltipName + "-" + d[i].id + "'>";
text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>PROP1</td>";
text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>" + property.prop1 + "</td>";
text += "</tr>";
text += "<tr class='" + $$.CLASS.tooltipName + "-" + d[i].id + "'>";
text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>PROP2</td>";
text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>" +
property.prop2+ " cm/s</td>";

If anybody cares, here is a ClojureScript version of the above algorithm (e.g. supita's answer), slightly simplified (without support for config). (This is probably nothing the OP asked for, but as of now there are so few resources on the net on this topic that most people might wind up here.)
:tooltip {
:contents
(fn [d default-title-format default-value-format color]
(this-as this
(let [this-CLASS (js->clj (.-CLASS this) :keywordize-keys true)
tooltip-name-class (:tooltipName this-CLASS)
rows (js->clj d :keywordize-keys true)
title-row (->> (first rows) (#(str "<table class='" (:tooltip this-CLASS)
"'><tr><th colspan='2'>"
(default-title-format (:x %)) "</th></tr>")))
data-rows (->> rows
(map #(str "<tr class='" tooltip-name-class "--" (:id %) "'>"
"<td class='name'><span style='background-color:"
(color (:id %)) "'></span>" (:name %) "</td>"
"<td class='value'>" (default-value-format (:value %)) "</td>"
"</tr>")))]
(str title-row (string/join data-rows) "</table>"))))}

Your question is about changing the content of the tooltip in c3js.
The tooltip has 3 variables
+----------------+
| title |
+----------------+
| name | value |
+----------------+
Plus, you want to add 'name' from an additional variable, other than those used in 'column'.
tooltip: {
format: {
title(x, index) { return ''; },
name(name, ratio, id, index) { return lst[index + 1]; },
value(value, ratio, id, index) { return value; }
}
},
this worked for me, feel free to play around with the arguments, to get what you need.

I faced a problem which is related tooltip position and style for c3 before. in order to arrange tooltip in c3 freely, my suggestion is manipulating tooltip with d3.
// internal = chart.internal()
const mousePos = d3.mouse(internal.svg.node()); // find mouse position
const clientX = mousePos[0]; //for x
const clientY = mousePos[1]; //for y
const tooltip = d3.select("#tooltip"); //select tooltip div (apply your style)
tooltip.style("display", "initial"); //show tooltip
tooltip.style("left", clientX - mouseOffSet.X + "px"); // set position
tooltip.style("top", clientY - mouseOffSet.Y + "px"); // set position
tooltip.html("<span>" + content + "</span>");
// you can arrange all content and style whatever you want
<div
id="tooltip"
className="your-style"
style={{ display: "none", position: "absolute" }}
/>
Good luck!!