I have a bar chart using Chartjs, with a fixed y-axis max. Sometimes the data can exceed the max, but the hover tooltip is always anchored to the top of the bars so it cannot be seen. The tooltips' position option does not really work for me.
So, is there a way to display the tooltip at the bottom of the bars? Or can it follow the hovering mouse cursor like canvasjs?
var ctx = document.getElementById("chart").getContext("2d");
var barChart = new Chart(ctx, {
type: 'bar',
options: {
scales: {
yAxes: [{
display: true,
ticks: {
min: 0,
max: 120
},
}],
},
tooltips: {
// position: 'nearest',
position: 'average',
},
legend: {
display: false
}
},
data: {
labels: ["A", "B", "C", "D"],
datasets: [{
label: "Data Set 1",
backgroundColor: [
'#44b2d7',
'#44b2d7',
'#44b2d7',
'#44b2d7',
],
borderColor: [
'#44b2d7',
'#44b2d7',
'#44b2d7',
'#44b2d7'
],
borderWidth: 0,
data: [131, 65, 165, 85]
}]
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script>
<canvas id="chart" height="180"></canvas>
New modes can be defined by adding functions to the Chart.Tooltip.positioners map.
You can create your custom postitioning like in the Doc of chartjs:
Chart.Tooltip.positioners.custom = function(elements, eventPosition) {
/** #type {Chart.Tooltip} */
var tooltip = this;
/* ... */
return {
x: eventPosition.x,
y: eventPosition.y
};
}
you need to set your custom function into your options when rendering your chart:
tooltips: {
position : 'custom', //<-- important same name as your function above
callbacks: {
label: function(tooltipItem, data) {
var label = Math.floor(tooltipItem.yLabel*100)/100+" "+data.datasets[tooltipItem.datasetIndex].label;
return label;
}
}
}
Look my full Fiddle example.
Related
I am using chart.js for my project. As you can see in the following code, chart.js uses different minimum and maximum values for y-axis for line and bar graphs for same data. In the given code, 1100-1700 is the value range for line graph whereas 0-2000 is the value range used for bar graph.
I like to make same minimum and maximum values for both line and bar graphs. One option is to find minimum, maximum and step-size values my own and use the properties min, max and ticks.stepSize under scales. But finding minimum, maximum and step-size for a given data data is a serious task.
For my requirement, default minimum ,maximum and stepSize used by chart.js for line graph is fine and I would like to use the same values for bar graph also.
I could first render line graph, get these values from this graph (like scales.y.min) and then use it for bar graph, which is perfectly working
Is there a way I could get the default min, max, stepSize values used by chart.js for line graph before actually drawing the graph? Any answers or pointers are really appreciated. Thanks
var chart1 = new Chart(document.getElementById('chart1'),
{
type: 'line',
data:
{
labels: ['a','b','c'],
datasets:
[
{
label: 'A',
data: [1212,1122, 1188, 1617, 1116],
borderColor: 'green',
}
]
}
});
var chart2 = new Chart(document.getElementById('chart2'),
{
type: 'bar',
data:
{
labels: ['a','b','c'],
datasets:
[
{
label: 'A',
data: [1212,1122, 1188, 1617, 1116],
backgroundColor: 'green',
}
]
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.9.1/chart.min.js"></script>
<div style="width:300px;height:200px"><canvas id="chart1"></canvas></div>
<div style="width:300px;height:200px"><canvas id="chart2"></canvas></div>
The first thing you could do is to set beginAtZero to false to Y axis of bar chart because is set to true by default:
https://github.com/chartjs/Chart.js/blob/v3.9.1/src/controllers/controller.bar.js#L636-L650
Then you can set the same scale config to both charts.
options: { // options of charts
scales: {
y: {
beginAtZero: false,
}
}
}
var chart1 = new Chart(document.getElementById('myChart1'),
{
type: 'line',
data:
{
labels: ['a','b','c'],
datasets:
[
{
label: 'A',
data: [1212,1122, 1188, 1617, 1116],
borderColor: 'green',
}
]
},
options: {
scales: {
y: {
beginAtZero: false,
}
}
}
});
var chart2 = new Chart(document.getElementById('myChart2'),
{
type: 'bar',
data:
{
labels: ['a','b','c'],
datasets:
[
{
label: 'A',
data: [1212,1122, 1188, 1617, 1116],
backgroundColor: 'green',
}
]
},
options: {
scales: {
y: {
beginAtZero: false,
}
}
}
});
.myChartDiv {
max-width: 300px;
max-height: 200px;
}
<script src="https://cdn.jsdelivr.net/npm/chart.js#3.9.1/dist/chart.min.js"></script>
<html>
<body>
<div class="myChartDiv">
<canvas id="myChart1" width="300" height="200"/>
</div>
<div class="myChartDiv">
<canvas id="myChart2" width="300" height="200"/>
</div>
</body>
</html>
I need after each value to be a percent symbol ( % ) For example: 12% instead of 12
The below code in write in laravel php for the chartpie.
<script src="{{asset('assets/admin/js/vendor/apexcharts.min.js')}}"></script>
<script src="{{asset('assets/admin/js/vendor/chart.js.2.8.0.js')}}"></script>
<script>
var ctx = document.getElementById('tokenomi');
var myChart = new Chart(ctx, {
type: 'doughnut',
data: {
labels:<?=$label?>,
datasets: [{
data:<?=$values?>,
],
borderColor: [
'rgba(231, 80, 90, 0.75)'
],
borderWidth: 0,
}]
},
options: {
aspectRatio: 1,
responsive: true,
maintainAspectRatio: true,
elements: {
line: {
tension: 0 // disables bezier curves
}
},
scales: {
xAxes: [{
display: false
}],
yAxes: [{
display: false
}]
},
legend: {
display: false,
}
}
});
</script>
Check the current chart pie below, I tried a lot but I can't find a solution.
How do I add percent sign (%) behind of all values
Thanks
You need to define a tooltips.callback.label function as shown below. For further details please consult Chart.js v. 2.8.0 documentation here.
options: {
...
tooltips: {
callbacks: {
label: (tooltipItem, data) => data.datasets[0].data[tooltipItem.index] + '%'
}
},
...
Please note that you're using a rather old version of Chart.js, the today latest stable version is 3.7.0.
I have used a Bubble Chart on Chart.js to create sliders to show comparable performance and they currently look a bit like this:
What am I trying to do
I want to add data labels just above / in my 'bubbles' with my values in. Much like the '10' you can see on each bubble here.
What have I done to achieve this
This is not standard Chart.js functionality but I found this post which was discussing a similar issue for bar / line charts.
I've installed the plugin that post suggested but the data label it shows is for the radius of the bubble and I want to it to be the x-axis of the bubble.
I've also tried to use the code from some of the answers on that post, but with absolutely no luck.
My Code
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.0/Chart.bundle.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels"></script>
<div class="container" >
<h2>Chart.js — Line Chart Demo</h2>
<div>
<canvas id="myChart"></canvas>
</div>
</div>
<script>
var ctx = document.getElementById('myChart').getContext('2d');
ctx.height = 1000;
var myChart = new Chart(ctx, {
type: 'bubble',
data: {
datasets: [
{
label: 'Your Data',
data: [
{x: 78.7, y: 0, r: 10, name: "Performance"}
],
backgroundColor: "rgba(153,255,51,0.6)"
},
{
label: 'Average',
data: [
{x: 100.7, y: 0, r: 10, name: "Performance"} // The labe needs to be X. not R.
],
backgroundColor: "rgba(255,0,128,0.6)"
}
]
},
options: {
maintainAspectRatio: false,
scales: {
yAxes: [{
id: 'first-y-axis',
type: 'linear',
ticks: {
min: 0,
max: 1,
stepSize: 1,
display: false
},
gridLines: {
display: false,
drawBorder: false
}
}],
xAxes: [{
ticks: {
min: 50, // Controls where axis starts
max: 120 // Controls where axis finishes
},
gridLines: {
display: false,
lineWidth: 3 // Width of bottom line
}
}]
}
}
});
</script>
Thanks in advance
I've managed to find the answer to this question, basically by taking apart the bubble chart example from the chartjs-plugin-datalabels plugin.
Below is a working example. Pay attention to the section in options that says 'plugin'.
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.0/Chart.bundle.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels"></script>
<div class="container" >
<h2>Chart.js — Line Chart Demo</h2>
<div>
<canvas id="myChart"></canvas>
</div>
</div>
<script>
var ctx = document.getElementById('myChart').getContext('2d');
ctx.height = 1000;
var myChart = new Chart(ctx, {
type: 'bubble',
data: {
datasets: [
{
label: 'Your Data',
data: [
{x: 78.7, y: 0, r: 10, name: "Performance"}
],
backgroundColor: "rgba(153,255,51,0.6)"
},
{
label: 'Average',
data: [
{x: 100.7, y: 0, r: 10, name: "Performance"} // The labe needs to be
],
backgroundColor: "rgba(255,0,128,0.6)"
}
]
},
options: {
plugins: { // Look at this bit
datalabels: {
anchor: function(context) {
var value = context.dataset.data[context.dataIndex];
return value.x < 50 ? 'end' : 'center';
},
align: function(context) {
var value = context.dataset.data[context.dataIndex];
return value.x < 50 ? 'end' : 'center';
},
color: function(context) {
var value = context.dataset.data[context.dataIndex];
return value.x < 50 ? context.dataset.backgroundColor : 'white';
},
font: {
weight: 'bold'
},
formatter: function(value) {
return Math.round(value.x);
},
offset: 2,
padding: 0
}
},
maintainAspectRatio: false,
scales: {
yAxes: [{
id: 'first-y-axis',
type: 'linear',
ticks: {
min: 0,
max: 1,
stepSize: 1,
display: false
},
gridLines: {
display: false,
drawBorder: false
}
}],
xAxes: [{
ticks: {
min: 50, // Controls where axis starts
max: 120 // Controls where axis finishes
},
gridLines: {
display: false,
lineWidth: 3 // Width of bottom line
}
}]
}
}
});
</script>
If all you want to do is changing the label, there is an easier solution. From the docs of chartjs-plugin-datalabels:
Data values are converted to string ('' + value). If value is an object, the following rules apply first:
value = value.label if defined and not null
else value = value.r if defined and not null
else value = 'key[0]: value[key[0]], key[1]: value[key[1]], ...'
Therefore, it is sufficient to specify a label in your data points:
data: [{ x: 78.7, y: 0, r: 10, name: "Performance", label: `${Math.round(x)}` }],
Just wondering if there is any way to set the horizontal bar labels for y-axis using chart.js. Here is how I set up the chart:
<div class="box-body">
<canvas id="chart" style="position: relative; height: 300px;"></canvas>
</div>
Javascript:
var ctx = document.getElementById('chart').getContext("2d");
var options = {
layout: {
padding: {
top: 5,
}
},
responsive: true,
animation: {
animateScale: true,
animateRotate: true
},
};
var opt = {
type: "horizontalBar",
data: {
labels: label,
datasets: [{
data: price,
}]
},
options: options
};
if (chart) chart.destroy();
chart= new Chart(ctx, opt);
chart.update();
As you all can see, the first and third labels are too long and cut off. Is there a way to make the label multi-line?
If you want to have full control over how long labels are broken down across lines you can specify the breaking point by providing labels in a nested array. For example:
var chart = new Chart(ctx, {
...
data: {
labels: [["Label1 Line1:","Label1 Line2"],["Label2 Line1","Label2 Line2"]],
datasets: [{
...
});
You can use the following chart plugin :
plugins: [{
beforeInit: function(chart) {
chart.data.labels.forEach(function(e, i, a) {
if (/\n/.test(e)) {
a[i] = e.split(/\n/);
}
});
}
}]
add this followed by your chart options
ᴜꜱᴀɢᴇ :
add a new line character (\n) to your label, wherever you wish to add a line break.
ᴅᴇᴍᴏ
var chart = new Chart(ctx, {
type: 'horizontalBar',
data: {
labels: ['Jan\n2017', 'Feb', 'Mar', 'Apr'],
datasets: [{
label: 'BAR',
data: [1, 2, 3, 4],
backgroundColor: 'rgba(0, 119, 290, 0.7)'
}]
},
options: {
scales: {
xAxes: [{
ticks: {
beginAtZero: true
}
}]
}
},
plugins: [{
beforeInit: function(chart) {
chart.data.labels.forEach(function(e, i, a) {
if (/\n/.test(e)) {
a[i] = e.split(/\n/);
}
});
}
}]
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id="ctx"></canvas>
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I want to paint a horizontal bar with Chart.js, but i want a default background color (Which is the max value) and paint the current value with another color. Just like the image below. How can i do this?
There is no easy way to do this in Chart.js (such as a specific "100% stacked bar" type). What you need is two stacked horizontal bars.
First, define your chart-type as a horizontalBar
// html
<canvas id="chart" height="20"></canvas>
// javascript
var ctx = document.getElementById('chart');
var bar_chart = new Chart(ctx, {
type: 'horizontalBar' // this will give you a horizontal bar.
// ...
};
In order to have a single bar instead of two, they need to be stacked. You also need to hide the scales. Optionally, you can hide the legend and the tooltip. This is all configured in the options:
var bar_chart = new Chart(ctx, {
// ...
options: {
legend: {
display: false // hides the legend
},
tooltips: {
enabled: false // hides the tooltip.
}
scales: {
xAxes: [{
display: false, // hides the horizontal scale
stacked: true // stacks the bars on the x axis
}],
yAxes: [{
display: false, // hides the vertical scale
stacked: true // stacks the bars on the y axis
}]
}
}
};
As stacked bars are placed on top of each other, your first dataset contains your value (57.866), and the second dataset corresponds to max - value. Here's an example considering value = 57866 and max = 80000:
var value = 57866; // your value
var max = 80000; // the max
var bar_chart = new Chart(ctx, {
// ...
datasets: [{
data: [value],
backgroundColor: "rgba(51,230,125,1)"
}, {
data: [max - value],
backgroundColor: "lightgrey"
}]
};
Here's the jsfiddle with the full code.
In addition to #Tarek's answer,
If you need to get the percentage value in the bar,
https://jsfiddle.net/akshaykarajgikar/bk04frdn/53/
Dependensies:
https://www.chartjs.org/
https://chartjs-plugin-datalabels.netlify.app/
var bar_ctx = document.getElementById('bar-chart');
var bar_chart = new Chart(bar_ctx, {
type: 'horizontalBar',
data: {
labels: [],
datasets: [{
data: [57.866],
backgroundColor: "#00BC43",
datalabels: {
color: 'white' //Color for percentage value
}
}, {
data: [100 - 57.866],
backgroundColor: "lightgrey",
hoverBackgroundColor: "lightgrey",
datalabels: {
color: 'lightgray' // Make the color of the second bar percentage value same as the color of the bar
}
}, ]
},
options: {
legend: {
display: false
},
tooltips: {
enabled: false
},
scales: {
xAxes: [{
display: false,
stacked: true
}],
yAxes: [{
display: false,
stacked: true
}],
}, // scales
plugins: { // PROVIDE PLUGINS where you can specify custom style
datalabels: {
align: "start",
anchor: "end",
backgroundColor: null,
borderColor: null,
borderRadius: 4,
borderWidth: 1,
font: {
size: 20,
weight: "bold", //Provide Font family for fancier look
},
offset: 10,
formatter: function(value, context) {
return context.chart.data.labels[context.dataIndex]; //Provide value of the percentage manually or through data
},
},
},
}, // options
});
<script src="https://cdn.jsdelivr.net/npm/chart.js#2.8.0"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels#0.7.0"></script>
<canvas id="bar-chart" height="20"></canvas>