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The Chart.js plugin is super, excellent, beautiful and easily customizable.
But even all this did not help me solve a few problems.
I have to create pixel perfect chart according to design shown on picture 1
I hope for your help!!
How to make those lines that without signatures be longer than those with signatures
I did the indentation from the scales to the graphs using the tickMarkLength parameter, but maybe it’s possible somehow under another, because you can see the overlap of one scale on another.
How to make the grid lines of the left and right scales coincide?
I set beforeUpdate .stepSize, but in spite of the fact that I specify that there should be 8 intervals, sometimes 8, then 9.
There is a link to my current code:
function data_generation(values_obj) {
let max_val=-900;
let min_val=0;
Object.keys(values_obj).forEach(function(key) {
chart_object={};
chart_object.label= values_obj[key].name;
chart_object.data= Object.values(values_obj[key].data);
chart_object.backgroundColor= values_obj[key].color;
if(key == 'TempOutdoor') {
chart_object.yAxisID = 'right-y-axis';
chart_object.backgroundColor= "transparent";
chart_object.pointRadius= 4;
chart_object.lineTension= 0;
chart_object.pointBackgroundColor="#FFF";
chart_object.pointBorderColor= "#60AD5E";
chart_object.borderColor= "#60AD5E";
chart_object.pointBorderWidth= 2;
chart_object.type= 'line';
} else {
chart_object.yAxisID = 'left-y-axis';
chart_object.lineTension= 0;
}
config.data.datasets.push(chart_object);
//find common min and max values
//min
if(min_val>parseFloat(values_obj[key].min)) {
min_val = parseFloat(values_obj[key].min);
}
//max
if(max_val < parseFloat(values_obj[key].max)) {
max_val = parseFloat(values_obj[key].max);
}
});
}
var config = {
drawTicks:false,
type: 'bar',
data: {
datasets: [ ],
labels: ''
},
options: {
animation: {
duration: 0
},
'legend':false,
responsive:true,
maintainAspectRatio: false,
scales: {
xAxes: [{
stacked: true,
barThickness: ($(window).width()<991.99)?14:24,
ticks: {
fontSize: ($(window).width()<991.99)?10:14,
},
gridLines : {
display : false
}
}],
yAxes: [
{
beforeUpdate: function(scale) {
//1 find max and min through all leftlabels
var left_side_list = config.data.datasets.filter(obj => {return obj.yAxisID == "left-y-axis"});
var left_side_list_data = [].concat(...Object.keys(left_side_list).map(e => left_side_list[e].data));
let max_val = Math.max.apply(Math,left_side_list_data);
let min_val = Math.min.apply(Math,left_side_list_data);
// 8 intervals - 9 lines
let left_iterval = (max_val - min_val) / 8;
//set stepsize
scale.chart.options.scales.yAxes[0].ticks.stepSize = left_iterval;
return;
},
id: 'left-y-axis',
type: 'linear',
position: 'left',
ticks: {
beginAtZero: false,
fontSize: ($(window).width()<991.99)?10:14,
callback: function(value, index, values) {
if(index % 2 == 0 || index==0) {
return ' ';
} else {
return " "+value.toFixed(0)+" ";
}
}
},
gridLines: {
drawBorder: false,
tickMarkLength: ($(window).width()<991.99)?34:84,
}
},
{
beforeUpdate: function(scale) {
//var nMaxRev = Math.max.apply(Math,scale.chart.config.data.datasets[1].data);
//get right object data
var temp_list = config.data.datasets.filter(obj => {return obj.yAxisID == "right-y-axis"});
//var temp_list = scale.chart.config.data.datasets.filter(obj => {return obj.yAxisID == "right-y-axis"});
//console.log(temp_list);
if(temp_list[0].data !== undefined || temp_list[0].data != []) {
var nMaxRev = Math.max.apply(Math, temp_list[0].data);
var nMinRev = Math.min.apply(Math, temp_list[0].data);
var nLeftTickCount = 8;
if(nMinRev<0) {
nLeftTickCount = 7;
}
var nTickInterval = (nMaxRev - nMinRev) / nLeftTickCount;
scale.chart.options.scales.yAxes[1].ticks.stepSize = nTickInterval;
}
return;
},
id: 'right-y-axis',
type: 'linear',
position: 'right',
ticks: {
beginAtZero: false,
fontSize: ($(window).width()<991.99)?10:14,
callback: function(value, index, values) {
if(index % 2 == 0 || index==0) {
return '';
} else {
return " "+value.toFixed(0);
}
}
},
gridLines: {
drawBorder: false,
tickMarkLength: ($(window).width()<991.99)?34:84,
}
}
]
}
}
};
window.onload = function() {
var data_string='{"success":true,"axis":["Пн","Вт","Ср","Чт","Пт","Сб","Вс"],"data":{"TempOutdoor":{"period_start":"2021-05-10 00:00:00","period_end":"2021-05-16 23:59:59","data":{"Пн":-4.9787234042553195,"Вт":-2.9166666666666665,"Ср":-3.3125,"Чт":2.5208333333333335,"Пт":6.84375,"Сб":0,"Вс":0},"min":"-4.98","max":"6.84","avg":"-0.26","sum":"-1.84","name":"Температура на улице","color":"#60AD5E","value_type":"instant"},"MotoHW":{"period_start":"2021-05-10 00:00:00","period_end":"2021-05-16 23:59:59","data":{"Пн":11,"Вт":15,"Ср":13,"Чт":12,"Пт":9,"Сб":0,"Вс":0},"min":"0.00","max":"15.00","avg":"8.57","sum":"60.00","name":"Мотогодини: Гаряча вода","color":"#29819D","value_type":"counter"}},"closestPeriods":{"previous":{"2021-05-03 00:00:00":"03.05 - 09.05"},"current":{"2021-05-10 00:00:00":"10.05 - 16.05"},"next":null}}';
var data = JSON.parse(data_string);
config.data.labels = data.axis;
var values_obj = data.data;
data_generation(values_obj);
//console.log(JSON.stringify(config));
var ctx = document.getElementById('StatisticsChartCanvas').getContext('2d');
window.StatisticsChart = new Chart(ctx,config);
};
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="chart-wrapper" style="width:548px; height:265px;">
<canvas id="StatisticsChartCanvas"></canvas>
</div>
After a huge amount of ideas, attempts and errors, I found a solution for the full customization of the scale.
For this I
Disabled the display of gridlines and ticks using property
display:false,
Wrote a plugin that draw gridlines and ticks in accordance with the design.
That's what happened
var AikGridLinePlugin = {
beforeDraw: function(chartInstance) {
var yScaleLeft = chartInstance.scales["left-y-axis"];
var yScaleRight = chartInstance.scales["right-y-axis"];
var canvas = chartInstance.chart;
var ctx = canvas.ctx;
//left axis
var left_side_list = chartInstance.data.datasets.filter(obj => {return obj.yAxisID == "left-y-axis"});
var left_side_list_data = [].concat(...Object.keys(left_side_list).map(e => left_side_list[e].data));
let left_side_list_max = Math.max.apply(Math,left_side_list_data);
let left_side_list_min = Math.min.apply(Math,left_side_list_data);
let left_iterval = (left_side_list_max - left_side_list_min) / 8;
// right axis
var right_side_list = chartInstance.data.datasets.filter(obj => {return obj.yAxisID == "right-y-axis"});
var right_side_list_data = [].concat(...Object.keys(right_side_list).map(e => right_side_list[e].data));
let right_side_list_max = Math.max.apply(Math,right_side_list_data);
let right_side_list_min = Math.min.apply(Math,right_side_list_data);
let right_iterval = (right_side_list_max - right_side_list_min) / 8;
var current_value_left = left_side_list_min,
current_value_right = right_side_list_min,
current_value_right_text=0;
for(var i=1;i<10;i++) {
ctx.lineWidth = 1;
ctx.font = "13px Roboto";
ctx.fillStyle = "#666666";
ctx.beginPath();
if(i%2==0) {
ctx.moveTo(47, yScaleLeft.getPixelForValue(current_value_left));
ctx.lineTo((canvas.width-47), yScaleLeft.getPixelForValue(current_value_left));
ctx.fillText((current_value_left>1)?current_value_left.toFixed(0):current_value_left.toFixed(1), 5, yScaleLeft.getPixelForValue(current_value_left)+5);
current_value_right_text=(current_value_right>1 || current_value_right<-1)?current_value_right.toFixed(0):current_value_right.toFixed(1);
ctx.fillText(current_value_right_text, (canvas.width-5-ctx.measureText(current_value_right_text).width), yScaleLeft.getPixelForValue(current_value_left)+5);
} else {
ctx.moveTo(15, yScaleLeft.getPixelForValue(current_value_left));
ctx.lineTo((canvas.width-15), yScaleLeft.getPixelForValue(current_value_left));
}
ctx.strokeStyle = "#91979F";
ctx.stroke();
current_value_left = current_value_left+left_iterval;
current_value_right = current_value_right+right_iterval;
}
return;
}
};
Chart.pluginService.register(AikGridLinePlugin);
function data_generation(values_obj) {
let max_val=-900;
let min_val=0;
Object.keys(values_obj).forEach(function(key) {
chart_object={};
chart_object.label= values_obj[key].name;
chart_object.data= Object.values(values_obj[key].data);
chart_object.backgroundColor= values_obj[key].color;
if(key == 'TempOutdoor') {
chart_object.yAxisID = 'right-y-axis';
chart_object.backgroundColor= "transparent";
chart_object.pointRadius= 4;
chart_object.lineTension= 0;
chart_object.pointBackgroundColor="#FFF";
chart_object.pointBorderColor= "#60AD5E";
chart_object.borderColor= "#60AD5E";
chart_object.pointBorderWidth= 2;
chart_object.type= 'line';
} else {
chart_object.yAxisID = 'left-y-axis';
chart_object.lineTension= 0;
}
config.data.datasets.push(chart_object);
//find common min and max values
//min
if(min_val>parseFloat(values_obj[key].min)) {
min_val = parseFloat(values_obj[key].min);
}
//max
if(max_val < parseFloat(values_obj[key].max)) {
max_val = parseFloat(values_obj[key].max);
}
});
}
var config = {
drawTicks:false,
type: 'bar',
data: {
datasets: [ ],
labels: ''
},
options: {
animation: {
duration: 0
},
'legend':false,
responsive:true,
maintainAspectRatio: false,
scales: {
xAxes: [{
id: 'x-axis',
stacked: true,
barThickness: ($(window).width()<991.99)?14:24,
ticks: {
fontSize: ($(window).width()<991.99)?10:14,
},
gridLines : {
display : false
}
}],
yAxes: [
{
id: 'left-y-axis',
type: 'linear',
position: 'left',
ticks: {
display:false,
},
gridLines: {
display : false,
drawBorder: false,
tickMarkLength: ($(window).width()<991.99)?34:84,
}
},
{
id: 'right-y-axis',
type: 'linear',
position: 'right',
ticks: {
display : false,
beginAtZero: false,
fontSize: ($(window).width()<991.99)?10:14,
},
gridLines: {
display : false,
drawBorder: false,
tickMarkLength: ($(window).width()<991.99)?34:84,
}
}
]
}
}
};
window.onload = function() {
var data_string='{"success":true,"axis":["Пн","Вт","Ср","Чт","Пт","Сб","Вс"],"data":{"TempOutdoor":{"period_start":"2021-05-10 00:00:00","period_end":"2021-05-16 23:59:59","data":{"Пн":-4.9787234042553195,"Вт":-2.9166666666666665,"Ср":-3.3125,"Чт":2.5208333333333335,"Пт":6.84375,"Сб":0,"Вс":0},"min":"-4.98","max":"6.84","avg":"-0.26","sum":"-1.84","name":"Температура на улице","color":"#60AD5E","value_type":"instant"},"MotoHW":{"period_start":"2021-05-10 00:00:00","period_end":"2021-05-16 23:59:59","data":{"Пн":11,"Вт":15,"Ср":13,"Чт":12,"Пт":9,"Сб":0,"Вс":0},"min":"0.00","max":"15.00","avg":"8.57","sum":"60.00","name":"Мотогодини: Гаряча вода","color":"#29819D","value_type":"counter"}},"closestPeriods":{"previous":{"2021-05-03 00:00:00":"03.05 - 09.05"},"current":{"2021-05-10 00:00:00":"10.05 - 16.05"},"next":null}}';
var data = JSON.parse(data_string);
config.data.labels = data.axis;
var values_obj = data.data;
data_generation(values_obj);
//console.log(JSON.stringify(config));
var ctx = document.getElementById('StatisticsChartCanvas').getContext('2d');
window.StatisticsChart = new Chart(ctx,config);
};
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="chart-wrapper" style="width:548px; height:265px;">
<canvas id="StatisticsChartCanvas"></canvas>
</div>
I am trying to hide data labels generated by the data labels plugin for small screens.
I thought that I could use the onResize property of chartjs and set display to false when the width got small. This is much like the hide labels solution found here.
Unfortunately, I've not been able to get this to work. I have the following CodePen that doesn't work.
var moneyFormat = wNumb({
decimals: 0,
thousand: ',',
prefix: '$',
negativeBefore: '-'
});
var percentFormat = wNumb({
decimals: 0,
suffix: '%',
negativeBefore: '-'
});
/*
* Unregister chartjs-plugins-datalabels - not really necessary for this use case
*/
Chart.plugins.unregister(ChartDataLabels);
var doughnutdata = {
labels: ['Housing',
'Food',
'Transportation',
'Clothing',
'Healthcare',
'Childcare',
'Misc'],
datasets: [
{
backgroundColor: [
'#9B2A00',
'#5B5C90',
'#6B8294',
'#1A6300',
'#BE0000',
'#B8A853',
'#64A856'
],
borderColor: [
'#FFFFFF',
'#FFFFFF',
'#FFFFFF',
'#FFFFFF',
'#FFFFFF',
'#FFFFFF',
'#FFFFFF'
],
data: [88480, 57680, 40050, 18430, 23860, 25840, 17490]
}
]
};
var chartOptions = {
responsive: true,
maintainAspectRatio: true,
legend: {
labels: {
boxWidth: 20
}
},
tooltips: {
callbacks: {
label: function (tooltipItem, data) {
var index = tooltipItem.index;
return data.labels[index] + ': ' + moneyFormat.to(data.datasets[0].data[index]) + '';
}
}
},
plugins: {
datalabels: {
anchor: 'end',
backgroundColor: function (context) {
return context.dataset.backgroundColor;
},
borderColor: 'white',
borderRadius: 25,
borderWidth: 1,
color: 'white',
font: {
size: 10
},
formatter: function (value, pieID) {
var sum = 0;
var dataArr = pieID.chart.data.datasets[0].data;
dataArr.map(function (data) {
sum += data;
});
var percentage = percentFormat.to((value * 100 / sum));
return percentage;
}
}
}
};
var doughnutID = document.getElementById('doughnutchart').getContext('2d');
var pieChart = new Chart(doughnutID, {
plugins: [ChartDataLabels],
type: 'doughnut',
data: doughnutdata,
options: chartOptions,
onResize: function(chart, size) {
var showLabels = (size.width < 500) ? false : true;
chart.options = {
plugins: {
datalabels: {
display: showLabels
}
}
};
}
});
Any ideas concerning what I'm doing wrong (and fixes) would be greatly appreciated.
Responsiveness can be implemented using scriptable options and in your case, you would use a function for the display option that returns false if the chart is smaller than a specific size. (Example):
options: {
plugins: {
datalabels: {
display: function(context) {
return context.chart.width > 500;
}
}
}
}
As usual, as soon as I post a question I come up with an answer. One solution using inline plugin definitions is given at the following CodePen. If you put a browser into developer mode and shrink the window to less than 540 px, the data labels will vanish.
The code is shown below:
"use strict";
/* global Chart */
/* global wNumb */
/* global ChartDataLabels */
/*
* Unregister chartjs-plugins-datalabels - not really necessary for this use case
*/
Chart.plugins.unregister(ChartDataLabels);
var moneyFormat = wNumb({
decimals: 0,
thousand: ",",
prefix: "$",
negativeBefore: "-"
});
var percentFormat = wNumb({
decimals: 0,
suffix: "%",
negativeBefore: "-"
});
var doughnutdata = {
labels: [
"Housing",
"Food",
"Transportation",
"Clothing",
"Healthcare",
"Childcare",
"Misc"
],
datasets: [
{
backgroundColor: [
"#9B2A00",
"#5B5C90",
"#6B8294",
"#1A6300",
"#BE0000",
"#B8A853",
"#64A856"
],
borderColor: [
"#FFFFFF",
"#FFFFFF",
"#FFFFFF",
"#FFFFFF",
"#FFFFFF",
"#FFFFFF",
"#FFFFFF"
],
data: [88480, 57680, 40050, 18430, 23860, 25840, 17490]
}
]
};
var chartOptions = {
responsive: true,
maintainAspectRatio: true,
legend: {
labels: {
boxWidth: 20
}
},
tooltips: {
callbacks: {
label: function(tooltipItem, data) {
var index = tooltipItem.index;
return (
data.labels[index] +
": " +
moneyFormat.to(data.datasets[0].data[index]) +
""
);
}
}
},
plugins: {
datalabels: {
anchor: "end",
backgroundColor: function(context) {
return context.dataset.backgroundColor;
},
borderColor: "white",
borderRadius: 25,
borderWidth: 1,
color: "white",
font: {
size: 10
},
formatter: function(value, pieID) {
var sum = 0;
var dataArr = pieID.chart.data.datasets[0].data;
dataArr.map(function(data) {
sum += data;
});
var percentage = percentFormat.to(value * 100 / sum);
return percentage;
}
}
}
};
var doughnutID = document.getElementById("doughnutchart").getContext("2d");
var pieChart = new Chart(doughnutID, {
plugins: [
ChartDataLabels,
{
beforeLayout: function(chart) {
var showLabels = (chart.width) > 500 ? true : false;
chart.options.plugins.datalabels.display = showLabels;
}
},
{
onresize: function(chart) {
var showLabels = (chart.width) > 500 ? true : false;
chart.options.plugins.datalabels.display = showLabels;
}
}
],
type: "doughnut",
data: doughnutdata,
options: chartOptions
});
I hope that this is useful.
is there any way to change style of hover as well as the tooltip with chartjs or ng2-charts? I want to hide the hover points and only display them whenever I hover on them along with the indicator as the line. Here is the exact chart model I want to build:
https://interactive-bitcoin-price-chart-foxkmkynmg.now.sh/
Thank you in advance for your tips.
EDIT: I followed instructions of GRUNT to apply this chart option into my Angular app, the full chart is shown with tooltip whenever I hover, but the line-trace indicator is not. Here are my codes:
plugin-hoverline.ts:
export class PluginHoverline {
posX: null;
isMouseOut:boolean = false;
drawLine(chart, posX) {
const ctx = chart.ctx,
x_axis = chart.scales['x-axis-0'],
y_axis = chart.scales['y-axis-0'],
x = posX,
topY = y_axis.top,
bottomY = y_axis.bottom;
if (posX < x_axis.left || posX > x_axis.right) return;
// draw line
ctx.save();
ctx.beginPath();
ctx.moveTo(x, topY);
ctx.lineTo(x, bottomY);
ctx.lineWidth = chart.options.lineOnHover.lineWidth;
ctx.strokeStyle = chart.options.lineOnHover.lineColor;
ctx.stroke();
ctx.restore();
};
beforeInit(chart) {
chart.options.events.push('mouseover');
};
afterEvent(chart, event) {
if (!chart.options.lineOnHover || !chart.options.lineOnHover.enabled) return;
if (event.type !== 'mousemove' && event.type !== 'mouseover') {
if (event.type === 'mouseout') this.isMouseOut = true;
chart.clear();
chart.draw();
return;
}
this.posX = event.x;
this.isMouseOut = false;
chart.clear();
chart.draw();
this.drawLine(chart, this.posX);
var metaData = chart.getDatasetMeta(0).data,
radius = chart.data.datasets[0].pointHoverRadius,
posX = metaData.map(e => e._model.x);
posX.forEach(function(pos, posIndex) {
if (this.posX < pos + radius && this.posX > pos - radius) {
chart.updateHoverStyle([metaData[posIndex]], null, true);
chart.tooltip._active = [metaData[posIndex]];
} else chart.updateHoverStyle([metaData[posIndex]], null, false);
}.bind(this));
chart.tooltip.update();
};
afterDatasetsDraw(chart, ease) {
if (!this.posX) return;
if (!this.isMouseOut) this.drawLine(chart, this.posX);
};
}
banner.component.ts: (chart component)
import { Component, OnInit } from '#angular/core';
import { HistoricalBpiService } from '../../services/historical-bpi.service';
import { PluginHoverline } from './plugin-hoverline';
#Component({
selector: 'app-banner',
templateUrl: './banner.component.html',
styleUrls: ['./banner.component.scss']
})
export class BannerComponent implements OnInit {
private dataUrl: string = 'historical/close.json';
constructor(
private historicalBpiService:HistoricalBpiService
) {}
// lineChart
public lineChartData:any = [
{ data:[], label: 'Bitcoin price' }
];
public lineChartLabels:Array<any> = [];
public lineChartOptions:any = {
responsive: true,
maintainAspectRatio: false,
layout: {
padding: 0
},
lineOnHover: {
enabled: true,
lineColor: '#bbb',
lineWidth: 1
},
scales: {
yAxes: [{
display: true,
scaleLabel: {
display: false,
labelString: 'USD'
},
ticks: {
display: false
},
gridLines: {
display: true,
tickMarkLength: 0
}
}],
xAxes: [{
ticks: {
display: false
},
gridLines: {
display: false,
tickMarkLength: 0
}
}]
},
elements: {
point: {
radius: 3
},
line: {
tension: 0.4, // 0 disables bezier curves
}
},
hover: {
mode: 'nearest',
intersect: false
},
tooltips: {
mode: 'nearest',
intersect: false,
backgroundColor: 'rgb(95,22,21)',
callbacks: {
label: function (tooltipItems, data) {
return data.datasets[tooltipItems.datasetIndex].label + ' : ' + '$' + tooltipItems.yLabel.toLocaleString();
},
labelColor: function(tooltipItem, chart) {
var dataset = chart.config.data.datasets[tooltipItem.datasetIndex];
return {
backgroundColor : dataset.backgroundColor
}
}
}
}
};
public lineChartColors:Array<any> = [
{
backgroundColor: 'rgba(199,32,48,0.8',
borderColor: 'rgb(95,22,21);',
pointBackgroundColor: 'rgba(218,208,163,0.8)',
pointHoverBackgroundColor: 'rgba(218,208,163,0.8)',
pointHoverBorderColor: 'rgb(218,208,163)',
pointHoverRadius: 6,
steppedLine: false
}
];
public lineChartLegend:boolean = false;
public lineChartType:string = 'line';
// events
public chartClicked(e:any):void {
console.log(e);
}
public chartHovered(e:any):void {
console.log(e);
}
ngOnInit(){
this.historicalBpiService.getBpiData(this.dataUrl)
.subscribe(
res => {
//this.lineChartData = Object.keys(res.bpi).map(function (key) { return res.bpi[key];});
this.lineChartData[0].data = Object.values(res.bpi);
this.lineChartLabels = Object.keys(res.bpi);
//console.log(this.lineChartData,this.lineChartLabels);
}
)
}
}
template:
<div class="chart">
<canvas baseChart height="360px"
[datasets]="lineChartData"
[labels]="lineChartLabels"
[options]="lineChartOptions"
[colors]="lineChartColors"
[legend]="lineChartLegend"
[chartType]="lineChartType"
(chartHover)="chartHovered($event)"
(chartClick)="chartClicked($event)"></canvas>
</div>
Unfortunately there is no built-in functionality for this yet. However you can use this chart plugin (once created for my own purpose) to achieve your goal.
To utilize the plugin, set the following option in your chart's options config :
lineOnHover: {
enabled: true,
lineColor: '#bbb',
lineWidth: 1
}
also, make sure to set the following properties for your dataset :
pointRadius: 0,
pointHoverRadius: 5,
pointHoverBackgroundColor: 'white'
see - live demo
This answer is to build on top of GRUNT's answer above to be able to display if its a multiline graph:
Just change the following (in the code snippet he provide here):
posX.forEach(function(pos, posIndex) {
if (this.posX < pos + radius && this.posX > pos - radius) {
chart.updateHoverStyle([metaData[posIndex]], null, true);
chart.tooltip._active = [metaData[posIndex]];
} else chart.updateHoverStyle([metaData[posIndex]], null, false);
}.bind(this));
to:
posX.forEach(function(pos, posIndex) {
var metaDatum = []
if (this.posX < pos + radius && this.posX > pos - radius) {
chart.data.datasets.forEach((dataset, ind) => {
metaDatum.push(chart.getDatasetMeta(ind).data[posIndex]);
})
chart.updateHoverStyle(metaDatum, null, true);
chart.tooltip._active = metaDatum;
} else {
metaDatum.push(metaData[posIndex]);
chart.updateHoverStyle(metaDatum, null, false);
}
}.bind(this));
How can I remove this square from tooltip?
I would prefer if I could manage to just have it one line like this: February - 2
var data = {
labels: ['January', 'February', 'March'],
datasets: [
{
data: [1,2,3]
}
]
};
var myLineChart = new Chart(document.getElementById('chart'), {
type: 'line',
data: data,
options: {
legend: {
display: false
}
}
});
Add this in your options object
tooltips: {
displayColors: false
}
Update for version 3 or greater (from #hanumanDev below):
Remove 's' from tooltips
tooltip: {
displayColors: false
}
here you go:
jsfiddle: http://jsfiddle.net/1v9fy5mz/
code:
html
<canvas id="canvas"></canvas>
js:
var ctx = document.getElementById("canvas").getContext("2d");
var data = {
labels: ['January', 'February', 'March'],
datasets: [{
data: [1, 2, 3]
}]
};
var myLineChart = new Chart(ctx, {
type: 'line',
data: data,
options: {
showAllTooltips: true,
tooltips: {
custom: function(tooltip) {
if (!tooltip) return;
// disable displaying the color box;
tooltip.displayColors = false;
},
callbacks: {
// use label callback to return the desired label
label: function(tooltipItem, data) {
return tooltipItem.xLabel + " :" + tooltipItem.yLabel;
},
// remove title
title: function(tooltipItem, data) {
return;
}
}
}
}
});
tooltips: {
displayColors: false,
callbacks: {
// use label callback to return the desired label
label: function(tooltipItem, data) {
return tooltipItem.xLabel + " :" + tooltipItem.yLabel;
},
// remove title
title: function(tooltipItem, data) {
return;
}
}
}
In version 3.8.0 of the chart.js plugin the tooltip config needs to go in the plugins config object, like this:
options: {
plugins: {
tooltip: {
displayColors: false
}
}
}
In Chart.js V1.0, I would add tooltipTemplate: "<%if (label){%><%=label %>: <%}%><%= '€' + value %>" to add a euro symbol as prefix to the tooltip label. However, this no longer works in V2. Does anybody know the new way to do accomplish this? I can't seem to find it.
Many thanks!
In the V2.0 the tooltipTemplate option is deprecated. Instead you can use callbacks to modify the displayed tooltips. There is a sample for the usage of callbacks here and you can find 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: 'line',
data: lineChartData,
options: {
tooltips: {
enabled: true,
mode: 'single',
callbacks: {
label: function(tooltipItems, data) {
return tooltipItems.yLabel + ' €';
}
}
},
}
});
Don't forget to set the HTML meta tag:
<meta charset="UTF-8">
In addition to iecs' answer, if you want to return the exact default text and add some more (like a € sign in your case), use following syntax :
var ctx = $(chartCanvas);
window.chartObject = new Chart(ctx, {
type: 'bar',
data: chartData,
options: {
tooltips: {
callbacks: {
label: function(tooltipItems, data) {
return data.datasets[tooltipItems.datasetIndex].label +': ' + tooltipItems.yLabel + ' €';
}
}
}
}
});
See if it helps:
var config = {
options: {
tooltips: {
callbacks: {
title: function (tooltipItem, data) { return data.labels[tooltipItem[0].index]; },
label: function (tooltipItem, data) {
var amount = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
var total = eval(data.datasets[tooltipItem.datasetIndex].data.join("+"));
return amount + ' / ' + total + ' ( ' + parseFloat(amount * 100 / total).toFixed(2) + '% )';
},
//footer: function(tooltipItem, data) { return 'Total: 100 planos.'; }
}
},
}
};
This set "label + value + €"
options: {
legend: {
display: false
},
tooltips: {
callbacks: {
label: function(tooltipItem, data) {
return data.labels[tooltipItem.index] + ': ' + data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index] + '€';
}
}
}
}
If you have a stacked bar chart (and I assume a stacked line chart) and you want to format all the data points included in a single bar with a currency symbol, you can do something like this:
tooltips: {
mode: 'label',
callbacks: {
label: function (tooltipItems, data) {
return '$' + tooltipItems.yLabel;
}
}
},
Note the value of mode.
If you want to have finer control of the tool tip, for example include the labels as they appear the chart's legend, you can do something like this:
tooltips: {
mode: 'single', // this is the Chart.js default, no need to set
callbacks: {
label: function (tooltipItems, data) {
var i, label = [], l = data.datasets.length;
for (i = 0; i < l; i += 1) {
label[i] = data.datasets[i].label + ' : ' + '$' + data.datasets[i].data[tooltipItems.index];
}
return label;
}
}
},
Just updating #Luc Lérot's answer.
I had the same problem and his code helped me out but not fixed it, I had to modify it to work for me.
Using Chart.js version 2.6.0
var ctx = $(chartCanvas);
window.chartObject = new Chart(ctx, {
type: 'bar',
data: chartData,
options: {
tooltips: {
callbacks: {
label: function (tooltipItems, data) {
return data.datasets[tooltipItems.datasetIndex].label + ': ' + data.datasets[tooltipItems.datasetIndex].data[tooltipItems.index] + ' €';
}
}
}
}
});
To generalize code, let's use unitPrefix and unitSuffix for the datasets, for example:
datasets: [
{
label: 'Loss Rate',
data: [],
unitSuffix: "%",
},
{
label: 'Price',
data: [],
unitPrefix: "$",
},
Then we could have this code:
options: {
tooltips: {
callbacks: {
label: function (tooltipItem, data) {
let dataset = data.datasets[tooltipItem.datasetIndex];
let blocks = [];
if (dataset.label) {
blocks.push(${dataset.label} + ':');
}
if (dataset.unitPrefix) {
blocks.push(dataset.unitPrefix);
}
blocks.push(dataset.data[tooltipItem.index])
if (dataset.unitSuffix) {
blocks.push(dataset.unitSuffix);
}
return blocks.join(' ');
},
},
},
},
As we continue our way along the release chain, the answer once again changes in Chart.js v3.X with the updated options API.
An example of adding temperature units is as follows:
const options = {
plugins: {
tooltip: {
callbacks: {
label: (item) =>
`${item.dataset.label}: ${item.formattedValue} °C`,
},
},
},
}
Chart.js version 3.9.1
const options: ChartOptions = {
plugins: {
tooltip: {
callbacks: {
label: ({ label, formattedValue }) => `${label}:${formattedValue}g`
}
}
}
}