Develop Reference

Styling problems with Chart.Js

How can I add these styles to my graph? I'm having trouble finding it in the documentation for it, and the other forums aren't very helpful. I am using Flask for the backend, so that's why the data values look like that.
Labels on top of bars
Change font size on both axis
Set y scale as a fixed value (0,8)
<script>
var ctx = document.getElementById('myChart').getContext('2d');
var options = {
scales: {
yAxes: [{
ticks: {
fontSize: 40
}
}]
}
}
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ['Lithium Battery', 'Other Mfg', 'Delivery', 'Tailpipe', 'Fuel Cycle', 'Disposal', 'Total'],
datasets: [{
label: 'ICEV CAR (MTCO2e/Year)',
labels: [
"{{data['battery_icev_car']}}",
"{{data['other_mfg_icev_car']}}",
"{{data['delivery_icev_car']}}",
"{{data['tailpipe_icev_car']}}",
"{{data['fuel_cycle_icev_car']}}",
"{{data['disposal_icev_car']}}",
"{{data['total_icev_car']}}"
],
data: [ /* errors are normal, fixes when server ru
[0, {{data['y1_icev']}}],
[{{data['y1_icev']}}, {{data['y2_icev']}}],
[{{data['y2_icev']}}, {{data['y3_icev']}}],
[{{data['y3_icev']}}, {{data['y4_icev']}}],
[{{data['y4_icev']}}, {{data['y5_icev']}}],
[{{data['y5_icev']}}, {{data['y6_icev']}}],
[0, {{data['y6_icev']}}]
],
backgroundColor: [
'rgba(0,0,0,0.9)'
],
borderColor: [
'rgba(0,0,0,1)'
],
borderWidth: 1,
borderSkipped: false
}]
},
options: {
responsive: true,
plugins: {
legend: {
labels: {
// This doesn't work on axis
font: {
size: 20
}
}
}
},
y: {
beginAtZero: true
}
}
});
</script> </script>

Since your config is not working I assume you are using V3, in which case the solution is as followed:
For point one you need to use an external plugin, you can write your own or use the datalabels plugin
For your second problem you need to style it as a font object as told in the documentation like so:
options: {
scales: {
y:{
ticks:{
font:{
size: 50
}
}
}
}
}
For your last part you can set the stepSize to 0.8

How to hide label for chart.js

I have chart which show 3 types of label
I want to keep two of them and want to hide one Invoice Income Report. How can I hide that one label? I am using chart.js v2
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: labels,
datasets: [{
label: 'Invoice Income Report',
data: bar_chart_data,
backgroundColor: colors,
borderWidth: 1
}, {
label: 'Below Average',
backgroundColor: ['rgba(255, 99, 132, 1)']
}, {
label: 'Above Average',
backgroundColor: ['rgba(11, 156, 49, 1)']
}]
},
options: {
scales: {
y: {
beginAtZero: true
}
},
}
});

You can simply make display false.
const options = {
responsive: true,
plugins: {
legend: {
position: 'top' as const,
display: false,
},
title: {
display: false,
text: 'Chart.js Line Chart',
},
},
};

To hide the labels on version 4.2.1 of chart.js use this:
// Example chart.
const chart = new Chart(id, {
type: 'bar', // Chart type.
data: data, // Your data.
options: {
// Add plugins to options.
plugins: {
legend: {
display: false // This hides all text in the legend and also the labels.
}
}
// add your scales or other options.
}
});
For more info use the doc: https://www.chartjs.org/docs/latest/configuration/legend.html

In chart.js, You can hide the labels using legend attribute. Add the following code in options of chart.js
legend: {
display: false
}
According to your code, after adding legend the options will be .....
options: {
scales: {
y: {
beginAtZero: true
}
},
legend: {
display: false
}
}

Add legend option to options configuration, set display to false:
, options: {
scales: {
y: {
beginAtZero: true
}
},
legend: {
display: false
}
}
docs3:https://www.chartjs.org/docs/latest/configuration/legend.html
docs2:https://www.chartjs.org/docs/2.6.0/configuration/legend.html

Chart data isnt showing in the canvas but console.log shows the expected values

So its my first time using chartjs. Im trying to use stacked horizontal charts. I have 2 values which I calculate using some sort function. I do console.logs to check if values are correct and they are both as expected. But when i try to update the chart only the first value shows in the canvas, and the 2nd value shows 0 but my chart gridlines adjusts correctly. Im not too sure what is happening.
Here is where I declare my chart data
var eventDays1 = 0;
var eventDays2 = 0;
var barChartData = {
labels: ['Events'],
datasets: [{
label: eventName1,
backgroundColor: "#E5C1BD",
data:[eventDays1]
}, {
label: eventName2,
backgroundColor: "#D2D0BA",
data:[eventDays2]
}
]};
Here is the actual chart
myBarChart = new Chart(ctx, {
type: 'horizontalBar',
data: barChartData,
options: {
legend: {
display: true,
labels: {
fontColor: 'black',
fontSize:20,
}
},
responsive: true,
scales: {
xAxes: [{ stacked: false,
ticks:{
fontColor:"black"
},
scaleLabel: {
display: true,
labelString: 'Days',
fontColor:"black"
}
}],
yAxes: [{
ticks: {
beginAtZero:true,
max:365,
fontColor:"black"
},
stacked: true,
}]
}
},
});
Here is my updateChart function that I call. Note that the console.logs
are values that I expect already.
function updateChart(newList){
eventDays1 = newList[0];
if(newList.length == 2){
eventDays2 = newList[1];
}
myBarChart.data.datasets[0].data[0] = eventDays1;
myBarChart.data.datasets[0].data[1] = eventDays2;
console.log("data 1 "+eventDays1);
console.log("data 2 "+eventDays2);
myBarChart.update();
}

How to remove the coloured rectangle(dataset label) in chartJS

I have used the chartjs 2.8 and drew a Bar chart using the same. There is one rectangle coming above the chart with filled color (https://imgur.com/a/fj8q0Tl). I have tried multiple ways to remove that but fails.
I have tried the below code but no luck.
legend: {
display: false,
}
Here is my current code
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: chartData1,
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
Could you anyone please tell me how to remove that?

It should be this, if it doesnt work you aren't on version 2 or something else is wrong.
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: chartData1,
options: {
legend: {
display: false,
},
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});

Chart.js - Hide line using label string after load

Using chart.js, I have a line chart that is displaying datasets compiled in a .net web app.
Is it possible to set a line as hidden/disabled once the data is loaded, based on the label name?
There is a hidden flag in chart.js that enables a dataset to be hidden on load, but this is set when initially defining the dataset. As the data has already been defined within the view, I cannot use this flag. E.g.
var viewsByMonthChartCtx = new Chart(viewsByMonthChartCtx, {
type: 'line',
data: {
labels: ['February 2017','March 2017'],
datasets:
[ { label: 'Home', data: [100,120 ] }, // I want to set 'hidden: true' to the Home dataset post initialization
{ label: 'Search', data: [200,240 ] } ]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
},
}
});

If you want to hide a dataset after the chart has been initialized (and rendered), then you still use the dataset hidden: true property. You simply just have to access the dataset from your chart instance and set the property to true.
Here is an example where a dataset matching a label is hidden 5 seconds after the page loads.
// the dataset label we want to hide after chart is initialized
var hiddenLabel = 'My Second Dataset';
var timerDuration = 5;
// hide a dataset after X seconds
setTimeout(function() {
var indexToHide = -1;
// find which dataset matches the label we want to hide
myLine.config.data.datasets.forEach(function(e, i) {
if (e.label === hiddenLabel) {
indexToHide = i;
}
});
// get the dataset meta object so we can hide it
var meta = myLine.getDatasetMeta(indexToHide);
// hide the dataset and re-render the chart
meta.hidden = true;
myLine.update();
}, timerDuration * 1000);
As you can see, you can just iterate over the datasets to find the index of the dataset with the matching label, then you simply set the hidden property to true and update the chart.
Here is a codepen that demonstrates a full working example.
With that said, it's not clear why you would want to do this after the chart is hidden. If you already know which dataset you want hidden at page load time, then you could just assemble your data and options chart config dynamically and set the hidden flag to true programmatically. Here is an example.
// the dataset label we want to hide
var hiddenLabel = 'My Second Dataset';
// build our data and options config (if needed you could build the datasets dynamically from dynamic data (this example is static)
var config = {
type: 'line',
data: {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: "My First Dataset",
backgroundColor: chartColors.red,
borderColor: chartColors.red,
data: [5, 10, 25, 15, 10, 20, 30],
fill: false,
}, {
label: "My Second Dataset",
fill: false,
backgroundColor: chartColors.blue,
borderColor: chartColors.blue,
data: [5, 0, 12, 5, 25, 35, 15],
}]
},
options: {
responsive: true,
title: {
display: true,
text: 'Chart.js Hide Dataset Matching "My Seconds Dataset" After 3 Seconds'
},
tooltips: {
mode: 'index',
intersect: false,
},
hover: {
mode: 'nearest',
intersect: true
},
scales: {
xAxes: [{
display: true,
scaleLabel: {
display: true,
labelString: 'Month'
}
}],
}
}
};
// iterate over our datasets to find the one we want to hide
config.data.datasets.forEach(function(e) {
if (e.label === hiddenLabel) {
e.hidden = true;
}
});
// instantiate the chart
var myLine = new Chart($('#canvas'), config);