I read many threads on the beginAtZero parameter in Chart.js, but none of the solutions I found actually work for me.
I have a simple line chart with dates on my x axe and integers in my y axe. I can't manage to make my y axe start with 0.
let atchoum = document.querySelector("#atchoum")
let statchoum = new Chart(atchoum, {
type: "line",
data: {
labels: {{ atchoumDate|raw }},
datasets: [{
label: "Nombre d'éternuements au support",
data: {{ atchoumNb|raw }},
borderColor: "blue",
tension: 0.3,
options: {
responsive: true,
scales: {
y: {
beginAtZero: true
}
},
animations: {
y: {
easing: 'easeInOutElastic',
from: (ctx) => {
if (ctx.type === 'data') {
if (ctx.mode === 'default' && !ctx.dropped) {
ctx.dropped = true;
return 0;
}
}
}
}
},
}
}]
}
})
You are defining your options in the dataset itself.
The options object is supposed to be on the same level as the type and data fields since the options are for the entire chart and not for a single dataset.
const options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 7, 9, 20, 8]
}]
},
options: {
scales: {
y: {
beginAtZero: true
}
}
}
}
const ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.5.1/chart.js"></script>
</body>
Related
Thanks for the help in advance.I am using doughnut graph of chartjs.In it the percentage value labels are coming on the graph.Is there any way i can hide it.
var category_doughnut_datas = [80,5,5,10];
var category_doughnut__data = {
labels: ["Safe Zone", "Level 1","Level 2","Level 3"],
};
var category_doughnut_options = {
cutoutPercentage: 60,
legend: {
display: false,
position: "top",
paddingBottom: 16,
align: "start",
labels: {
fontColor: "#555555",
fontSize: 20,
boxWidth: 0,
},
},
tooltips: {
displayColors: false,
},
responsive: true,
};
var dough_ctx = document.getElementById("overallStatus").getContext("2d");
if (dough_ctx) {
var myDoughnutChart = new Chart(dough_ctx, {
type: "doughnut",
data: category_doughnut__data,
options: category_doughnut_options,
});
}
Since you dont specify any options to draw it on the chart in your options and its not default chart.js behaviour I expect you defined it as defaults somewhere, in which case you can in your options object in the plugins section specify datalabels: false to stop it from rendering:
Chart.register(ChartDataLabels);
Chart.defaults.plugins.datalabels.color = '#fff';
Chart.defaults.plugins.datalabels.formatter = (value, ctx) => {
let sum = 0;
let dataArr = ctx.chart.data.datasets[0].data;
dataArr.map(data => {
sum += data;
});
let percentage = (value * 100 / sum).toFixed(2) + "%";
return percentage;
};
const options = {
type: 'doughnut',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"]
}]
},
options: {
plugins: {
datalabels: false // Removing this line shows the datalabels again
}
}
}
const ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.5.1/chart.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/chartjs-plugin-datalabels/2.0.0/chartjs-plugin-datalabels.js"></script>
</body>
options.plugins.datalabels: false should be mentioned.
Without it, the value is set to be true by default.
This is using charts.js. This code only makes the line graph but the title, x axis and y axis does not show. I want to add title, and the names for those 2 axis onto the graph. what is wrong and how do you fix it? I also want to make the y axis to start from 0 and up.
async function chartDisplay() {
await getData1();
await getData2();
const ctx = document.getElementById('chart').getContext('2d');
const myChart = new Chart(ctx, {
type: 'line',
data: {
labels: xLabels,
datasets: [{
data: ratingDataI,
label: "data1",
borderColor: "#3E95CD",
fill: false
},
{
data: ratingDataA,
label: "data2",
borderColor: "#3E95CD",
fill: false
}
]
},
options: {
responsive: true,
title: {
display: true,
text: 'Chart.js Line Chart'
},
tooltips: {
mode: 'label',
},
hover: {
mode: 'nearest',
intersect: true
},
scales: {
x: [{
display: true,
scaleLabel: {
display: true,
labelString: 'Dates'
}
}],
y: [{
display: true,
scaleLabel: {
display: true,
labelString: 'Value'
}
}]
}
}
});
}
the x and y should not be arrays but objects, also the scaleLabel prop is called title now. For all the changes please read the migration guide (https://www.chartjs.org/docs/master/getting-started/v3-migration.html)
Example:
var options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'pink'
}]
},
options: {
scales: {
y: {
beginAtZero: true,
title: {
display: true,
text: 'yAxis'
}
},
x: {
title: {
display: true,
text: 'xAxis'
}
}
}
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.4.1/chart.js"></script>
</body>
There is an old post with a solution that does not work. I tried
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero:true
}
}],
yAxes: [{
ticks: {
fontSize: 40,
size: 40
}
}]
}
}
but it does not change the font size of the y axis labels of my chart. My chart is a simple chart with just one X axis and one Y axis.
The way scales options and font options are defined have been changed in chart.js v3 along with some other breaking changes, please read the migration guide: https://www.chartjs.org/docs/master/getting-started/v3-migration.html
To change the font size of the ticks you have to define a font opbject in the ticks with a different way of defining the scale.
Live example:
var options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderWidth: 1
}]
},
options: {
scales: {
y: {
ticks: {
font: {
size: 20
}
}
},
x: {
ticks: {
font: {
size: 20
}
}
}
}
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.4.0/chart.js"></script>
</body>
You can use like this
scales: {
yAxes: [{
ticks: {
beginAtZero:true,
fontSize: 40
}
}]
}
Here is the code which can help you.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.2.1/Chart.min.js"></script>
<div class="container
<div class="row">
<div class="col-md-1"></div>
<div class="col-md-10">
<canvas id="myChart"></canvas>
</div>
<div class="col-md-1"></div>
</div>
</div>
<script type="text/javascript">
var canvas = document.getElementById("myChart");
var ctx = canvas.getContext('2d');
Chart.defaults.global.defaultFontColor = 'dodgerblue';
Chart.defaults.global.defaultFontSize = 16;
var data = {
labels: ["Vanilla", "Chocolate", "Strawberry"],
datasets: [
{
label: "Ice Cream Sales ",
fill: true,
backgroundColor: [
'moccasin',
'saddlebrown',
'lightpink'],
data: [11, 9, 4]
}
]
};
var options = {
title: {
display: true,
text: 'Ice Cream Truck Report',
position: 'bottom'
},
scales: {
yAxes: [{
ticks: {
beginAtZero:true,
fontSize: 40
}
}]
}
};
var myBarChart = new Chart(ctx, {
type: 'bar',
data: data,
options: options
});
</script>
I'm creating an stack bar chart using chart.js. I need to hide the labels which don't have data on the current chart. As an example I want to only show "Prediction Success" label as data related to other labels are not there for the current date range. How can we do that?
You can use the legend filter like this:
var options = {
type: 'bar',
data: {
labels: ["Red", "Yellow", "Blue", "Yellow", "Green", "Purple", "Orange", "Green"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 0, 5, 6],
borderWidth: 1,
backgroundColor: 'red'
},
{
label: '# of NonVotes',
data: [],
borderWidth: 1,
backgroundColor: 'blue'
}
]
},
options: {
plugins: {
legend: {
labels: {
filter: (legendItem, chartData) => (legendItem, chartData, chartData.datasets[legendItem.datasetIndex].data.length > 0)
}
}
}
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.1.0/chart.js" integrity="sha512-LlFvdZpYhQdASf4aZfSpmyHD6+waYVfJRwfJrBgki7/Uh+TXMLFYcKMRim65+o3lFsfk20vrK9sJDute7BUAUw==" crossorigin="anonymous"></script>
</body>
i am using chartjs lastest version (2.6.0). I just have a simple question that I want to get each bar width but i can not find the answer anywhere. Could someone please help me. Thanks alot. Here is simple bar chart.
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3]
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas class="canvasChart" id="myChart"></canvas>
You can get each bar's width (basically the same) in ChartJS, using .getDatasetMeta() method.
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3]
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
function getWidth() {
var barWidth = myChart.getDatasetMeta(0).data[0]._view.width;
alert(barWidth);
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<button onclick="getWidth()">Get Bar Width</button>
<canvas class="canvasChart" id="myChart"></canvas>