How can I move text around on a pie chart in ChartJS? - javascript

Wondering how I can move the text more to the left and create a new line between the labels. As you can see the "label" and "percentage" are on top of each other.
I'm using ChartJS v2.8.0 and ChartJS Plugin Labels 1.1.0
Current Look:
Desired Look:
Current code:
var chart = new Chart(ctx, {
type: 'pie',
data: {
labels: ['T-Shirts', 'Sweaters'],
datasets: [{
backgroundColor: [$('#chart-color-1').val(), $('#chart-color-2').val()],
data: [$('#attire_1_percent').val(), $('#attire_2_percent').val()],
borderWidth: 0
}]
},
options: {
maintainAspectRatio: false,
legend: {
display: false
},
plugins: {
labels: [{
render: "label",
fontColor: '#fff',
},
{
render: 'percentage',
fontColor: '#fff',
}
],
},
tooltips: {
callbacks: {
label: function(tooltipItem, data) {
return data.labels[tooltipItem.index] + ": " + data.datasets[0].data[tooltipItem.index] + "%"
}
},
},
}
});

Related

Chart JS Tooltip Currency Problem - Stacked Bar Chart

I use ChatJS and i want to add an € Symbol after every number in the Tooltip.
On my most charts it works perfectly but the Stacked Bar Chart makes me problems.
Here is an example Code like mine (Just a basic Example)
var barChart = new Chart(ctx_barChart, {
type: 'bar',
data: {
labels: ["Fruits"],
datasets: [{
label: [
["Apple"]
],
data: [12],
backgroundColor: 'blue',
barThickness: 80,
},
{
label: ["Banana"],
data: [15],
backgroundColor: 'red',
barThickness: 80,
},
]
},
options: {
maintainAspectRatio: false,
indexAxis: 'y',
responsive: true,
scales: {
x: {
stacked: true,
display: false,
},
y: {
stacked: true,
display: false,
mirror: true,
}
},
plugins: {
tooltip: {
callbacks: {
label: function(context) {
let label = context.dataset.label || '';
if (label) {
label += ': ';
}
if (context.parsed.y !== null) {
label += new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'EUR'
}).format(context.parsed.y);
}
return label;
}
}
},
legend: {
display: false
},
title: {
display: false,
},
},
},
});
The tooltips both show 0,00$, but not my Values 12 and 15. Anyone have an suggestiont?
You should use context.parsed.x instead of context.parsed.y since it's a horizontal bar chart.
Please take a look at your amended code and see how it works.
new Chart('barChart', {
type: 'bar',
data: {
labels: ["Fruits"],
datasets: [{
label: "Apple",
data: [12],
backgroundColor: 'blue',
barThickness: 80,
},
{
label: "Banana",
data: [15],
backgroundColor: 'red',
barThickness: 80,
},
]
},
options: {
maintainAspectRatio: false,
indexAxis: 'y',
responsive: true,
scales: {
x: {
stacked: true,
display: false,
},
y: {
stacked: true,
display: false,
mirror: true,
}
},
plugins: {
tooltip: {
callbacks: {
label: ctx => ctx.dataset.label + ': ' + new Intl.NumberFormat('de-DE', { style: 'currency', currency: 'EUR' }).format(ctx.parsed.x)
}
},
legend: {
display: false
},
title: {
display: false,
},
},
},
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.7.1/chart.min.js"></script>
<canvas id="barChart" height="100"></canvas>

Chart.js: how to order the tool tips in the graph

I generate a graph where I have 3 groups of data:
bottom
middle
top
Each bar has the top values at the top of the bar, then the middle value and then the bottom value.
When Chart.js displays the tooltip, I have first the bottom value, then the middle and the the top. So, it is the opposite of the order in the bar.
To display the values I added this code
var stackedBarChartOptions = {
responsive: true,
maintainAspectRatio: false,
tooltips: {
mode: 'label',
callbacks: {
label: function (tooltipItem, data) {
return data.datasets[tooltipItem.datasetIndex].label + ": " +
tooltipItem.yLabel;
}
}
}
}
Is it possible to order the list of tool tips?
in the tooltip label callback, we can choose any index to display.
in your callback, you're displaying the index passed to the callback.
tooltipItem.datasetIndex
instead, let's display the reverse order...
data.datasets.length - 1 - tooltipItem.datasetIndex
but we will also have to add the callback for labelColor,
to display the correct color box for the specific label.
see following working snippet...
var chart_canvas = document.getElementById('myChart');
var stackedLine = new Chart(chart_canvas, {
type: 'bar',
data: {
labels: ['A'],
fill: true,
datasets: [
{
label: 'Low',
data: [67.8],
backgroundColor: '#D6E9C6'
},
{
label: 'Moderate',
data: [20.7],
backgroundColor: '#FAEBCC'
},
{
label: 'High',
data: [11.4],
backgroundColor: '#EBCCD1'
}
]
},
options: {
responsive: true,
maintainAspectRatio: false,
tooltips: {
mode: 'label',
callbacks: {
labelColor: function (tooltipItem, data) {
return {backgroundColor: data.data.datasets[data.data.datasets.length - 1 - tooltipItem.datasetIndex].backgroundColor};
},
label: function (tooltipItem, data) {
return data.datasets[data.datasets.length - 1 - tooltipItem.datasetIndex].label + ": " + data.datasets[data.datasets.length - 1 - tooltipItem.datasetIndex].data[tooltipItem.index];
}
}
},
scales: {
xAxes: [{
stacked: true
}],
yAxes: [{
stacked: true
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.bundle.min.js"></script>
<canvas id="myChart"></canvas>

Data Labels wrongly positioned on bar chart - chartjs

I'm using chartjs-plugin-datalabels to show values on chart, but the labels are not centered.
The main part is in the datasets.datalabels where I can override default settings, which sets to center anyway, but wanted to show where its done.
I have tried positione it to the right, but as the value getting bigger, the datalabel is less centered.
Chart.register(ChartDataLabels);
const data_tafkidim_cat_count = {
labels: window.TafkidimCatCount.map((el) => el.TafkidCat.split(' ')).slice(0, pagination['tafkidim_cat_count'].show),
datasets: [
{
data: window.TafkidimCatCount.map((el) => el.Total),
backgroundColor: Setcolors(),
borderColor: Setcolors(1),
borderWidth: 1,
datalabels: {
anchor: 'center',
align: 'center',
},
},
],
};
const config_tafkidim_cat_count = {
type: 'bar',
data: data_tafkidim_cat_count,
options: {
scales: {
x: {
grid: {
borderColor: '#829AB1',
},
ticks: {
color: '#627D98',
},
reverse: true,
},
y: {
grid: {
borderColor: '#829AB1',
},
beginAtZero: true,
ticks: {
color: '#627D98',
},
},
},
plugins: {
title: {
text: TL['tafkidim_cat_count'],
padding: {
bottom: 20,
},
},
legend: {
display: false,
},
tooltip: {
callbacks: {
title: (context) => {
return context[0].label.replaceAll(',', ' ');
},
},
},
},
},
};
const tafkidim_cat_count = new Chart('#tafkidim-cat-count'.Element().getContext('2d'), config_tafkidim_cat_count);
solved it with
textAlign = "center"
apparently the default is "start".

Legends in Chart.js, shows only one label

Just a warning: I am new to chart.js!
I have a couple of horizontal bar charts and it works fine except one issue that I cannot shake off. I have 5 labels in y-axis but the legend on top of the graph only shows one small rectangle in the color of the first (topmost) bar and even that does not display the label itself, followed by list of labels. I thought it would display each label next to small bar same color as in chart.
Unfortunately, this is an intranet app and I cannot provide a link but here is what I have (data is passed to this function from an ajax call):
function drawRespChart(chartLabels, chartData) {
var ctx = $("#rtChart");
console.log("Labels Array: " + chartLabels);
console.log("Data Array: " + chartData);
if (chartRespTime)
chartRespTime.destroy();
var chart = {
labels: chartLabels,
datasets: [
{
label: chartLabels,
backgroundColor: ["#c45850", "#e8c3b9", "#3cba9f", "#8e5ea2", "#3e95cd"],
data: chartData
}
]
};
chartRespTime = new Chart(ctx, {
type: 'horizontalBar',
data: chart,
datalabels: {
anchor: 'end',
align: 'start',
},
options: {
title: {
display: true,
text: 'IDC Database Response Time (mili-seconds)'
},
legend: {
display: true,
labels: {
fontColor: 'rgb(255, 99, 132)'
}
},
scales: {
xAxes: [{
display: true,
scaleLabel: {
display: true,
labelString: 'Count'
},
ticks: {
major: {
fontStyle: 'bold',
fontColor: '#FF0000'
}
}
}],
yAxes: [{
display: true,
scaleLabel: {
display: true,
labelString: 'Response Time (ms)'
}
}]
},
plugins: {
datalabels: {
color: 'white',
display: function (context) {
return context.dataset.data[context.dataIndex] > 15;
},
font: {
weight: 'bold'
},
formatter: Math.round
}
},
maintainAspectRatio: true,
responsive: true,
showInlineValues: true,
centeredInllineValues: true,
tooltipCaretSize: 0
}
});
}
This is what I see in console window:
Labels Array: 0-350,350-700,700-1000,1000-1500
Data Array: 5065,32,27,3
What I see as legend is one rectangle, same color as first bar, followed by list of labels.
It seems that charts.js labels only works when you split the datasets.
Leaving an example.
https://jsfiddle.net/code4mk/1j62ey38/
datasets: [ {
label: 'Result',
fill:false,
data: aDatasets1,
backgroundColor: '#E91E63',
},
{
label: 'Result2',
fill:false,
data: aDatasets2,
backgroundColor: '#E91E93',
}];

How do I create a legend for a bar chart?

How do I create legends like the following:
So far I have the following:
I can't figure out how to specify labels for the legend. They don't provide examples either.
https://www.chartjs.org/docs/latest/configuration/legend.html
So far I have the following code:
var topClickSourcesChart = new Chart('dashboard-click-source-chart', {
type: 'bar',
data: {
labels: ["Facebook","Google","NONE",],
datasets: [{
data: [10,5,3,],
backgroundColor: ['#4D90C3', '#866DB2', '#EA6F98', '#61BDF6', '#768BB7'],
}],
},
options: {
scales: {
xAxes: [{
display: false,
}]
},
legend: {
position: 'right',
labels: {
boxWidth: 10,
}
}
}
});
To show a legend you need to set the label property of a dataset, so the type of output you are expecting can be built by creating a chart from the code as shown below. Fiddle -> https://jsfiddle.net/6nkcx8sq/
var topClickSourcesChart = new Chart('dashboard-click-source-chart', {
type: 'bar',
data: {
labels: ["Number of users"],
datasets: [{
label: 'Facebook',
data: [10],
backgroundColor: '#4D90C3',
},
{
label: 'Instagram',
data: [15],
backgroundColor: '#866DB2',
},
{
label: 'Twitter',
data: [7],
backgroundColor: '#EA6F98',
}],
},
options: {
scales: {
xAxes: [{
display: false,
}],
yAxes: [{
ticks: {
beginAtZero: true
}
}]
},
legend: {
position: 'right',
labels: {
boxWidth: 10,
}
}
}
});
I was able to get it with the following, but it was a pain in the ass for loops due to the backgroundColor having to be inside the dataset.
var topClickSourceChart = new Chart('dashboard-click-source-chart', {
type: 'bar',
data: {
labels: ["Facebook","Google","NONE",],
datasets: [
{label: "Facebook", data: [10]},{label: "Google", data: [5]},{label: "NONE", data: [3]},
]
},
options: {
scales: {
xAxes: [{
display: false,
}],
yAxes: [{
ticks: {
beginAtZero: true,
}
}]
},
legend: {
position: 'right',
labels: {
boxWidth: 10,
}
}
}
});
if (topClickSourceChart.data.datasets.length > 0) topClickSourceChart.data.datasets[0].backgroundColor = '#4D90C3';
if (topClickSourceChart.data.datasets.length > 1) topClickSourceChart.data.datasets[1].backgroundColor = '#866DB2';
if (topClickSourceChart.data.datasets.length > 2) topClickSourceChart.data.datasets[2].backgroundColor = '#EA6F98';
if (topClickSourceChart.data.datasets.length > 3) topClickSourceChart.data.datasets[3].backgroundColor = '#61BDF6';
if (topClickSourceChart.data.datasets.length > 4) topClickSourceChart.data.datasets[4].backgroundColor = '#768BB7';
Here is the JSP/JSTL loop:
data: {
labels: [<c:forEach items="${clickSources}" var="cs">"${cs.key}",</c:forEach>],
datasets: [
<c:forEach items="${clickSources}" var="cs">{label: "${cs.key}", data: [${cs.value}]},</c:forEach>
]
},
I still could not find a way to make the top of the bars rounded.

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