I'm using Chart.js for my pie/bar charts and on the line and the bar chart all of the 'x' axis labels are not all showing for some reason, however in the pie chart they are:
Code below has been used and the 'type' has just been altered for the type of graph I wished to use:
var ctx = document.getElementById("my3Chart");
var mylineChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["Time Management", "Career Coach", "Stress & Wellbeing", "Note Taking", "Exam Prep", "Presentations"],
datasets: [{
label: 'Module Tracker',
data: [6, 4, 2, 0, 3, 1],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255,99,132,1)'
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero:true
}
}]
}
}
});
I've tested your code in a fiddle with Chart.js 2.0 for both bar/line and it looks fine. Chart takes in x-axis labels with:
labels: ["Time Management", "Career Coach", "Stress & Wellbeing", "Note Taking", "Exam Prep", "Presentations"]
The reason you can't see all your x-axis labels is that the width's are too thin. You can fix this by either expanding your width, or rotating your labels to be vertical instead.
400px width example: https://jsfiddle.net/swcy2opv/
Rotated labels example: https://jsfiddle.net/swcy2opv/1/
Related
I'm creating a line diagram using chart.js, and my X axis is of type category (which, in my case, makes absolute sense). Now, chart.js creates all categories with the same width, which I guess is a reasonable default.
However, I would like to have categories of different width, e.g.: The first category should be 3 times as wide as the second one, and the third one should be 2 times as wide as the second one, essentially rendering something such as:
| | | |
| | | |
| | | |
A B C
Is this possible? If so, how?
Have you tried using: dataset.barPercentage?
I used scale 1.0 to represent 3.0 and made the other ones relative to that scale.
var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ['Red', 'Blue', 'Yellow'],
datasets: [{
label: '# of Votes',
data: [3, 4, 2],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)'
],
borderWidth: 1,
barPercentage: [
1.0,
0.333,
0.667
]
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.css" rel="stylesheet" />
<canvas id="myChart" width="400" height="200"></canvas>
My json array looks like this
[{"count":2,"DepartementNom":"Finance"},{"count":1,"DepartementNom":"Technique"}]
How can I populate a chart.js pie chart using that dataset?
I've tried this code but there seems to be a problem with it somewhere.
var d = {!! json_encode($json_deco) !!};
new Chart(document.getElementById("pie-chart"), {
type: 'pie',
data: d,
options: {
title: {
display: true,
text: "Nombre demployés par departement"
}
}
});
You can not do it that way. Here in the documentation there are some examples
One of the simple ways to set the data for a chart can be done that way:
data: {
labels: ['Finance', 'Technique'],
datasets: [{
data: [1, 2],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)'
],
borderWidth: 1
}]
},
Working fiddle example
I have two charts, First chart shows the breakup of Shirt sales.
Second is the comparison of Blue Shirt vs Blue Trouser sales.
I want to import the Blue Shirt value from the first Chart to Second chart.
Here is the Code with two charts:
var ctx = document.getElementById("myChart1").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: 'Shirts',
data: [10, 10, 15, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255,99,132,1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero:true
}
}]
},
}
});
var ctx = document.getElementById("myChart2").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["Blue Shirts", "Blue Trousers"],
datasets: [{
label: 'Sales',
data: [10, 8],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
],
borderColor: [
'rgba(255,99,132,1)',
'rgba(54, 162, 235, 1)',
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero:true
}
}]
},
}
});
Here is the JSFiddle (https://jsfiddle.net/kingBethal/L8x790fn/15/).
I found this thread describing getting data from click events: Click events on Pie Charts in Chart.js
I made also made a new fiddle here where it logs a chart object containing the chart data on chart click: https://jsfiddle.net/btnL9d2a/16/
myChart1Canvas.onclick = function(evt) {
var activePoints = myChart.getElementsAtEvent(evt);
if (activePoints[0]) {
var chartData = activePoints[0]['_chart'].config.data;
// `chartData` will be an object in the format {'Labels' : Array, 'datasets' : Array}.
console.log(chartData);
}
};
chartData.datasets[0].data is an array of the clicked-on chart's data.
I'm using ChartJS to create a simple, static bar graph. As you can see in the picture, there is a small gap between the first x-value (January) and the y-axis. Is there a way to remove that gap and have the first x-axis value start/hug at the y-axis (point: 0,0)? I've looked all over the ChartJS docs and everything I've tried just doesn't work. From my research it seems you should be able to implement this via the options object but I'm at a loss. Any and all help is greatly appreciated!
Thanks!
Set the below option for chart. It will work
var myBarChart = new Chart(ctx, {
type: 'bar',
data: data,
options: {
scales : {
xAxes : [{
barPercentage : 1,
categoryPercentage : 1
}]
}
}
});
[Sample-Code]
var ctx = document.getElementById("myChart1");
var data = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255,99,132,1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1,
data: [65, 59, 80, 81, 56, 55, 40],
}
]
};
var myBarChart = new Chart(ctx, {
type: 'bar',
data: data,
options: {
scales : {
xAxes : [{
barPercentage : 1,
categoryPercentage : 1
}]
}
}
});
I have the following script of drawing bar chart and I wanna add horizontal line on particular y dot. I was trying following example link and I just substituted Chart.types.Line.extend with Chart.types.Bar.extend
but as a result I'm getting can not read property extend of undefined
So can someone help to implement above example which in the link properly or suggest another decision
my source code without horizontal line
var ctx = document.getElementById("myChart");
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],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255,99,132,1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero:true
},
}]
},
}
});
You can use Chart.js plugins to do that. Plugins let you handle specific events such as beforeUpdate or afterDraw and are also easy to implement :
Chart.pluginService.register({
afterDraw: function(chart) {
// Code here will be triggered ... after the drawing
}
});
An easy way to do it is to simply draw a line like you would you on a simple canvas element, after everything is drawn in your chart, using the lineTo method.
Here is a small example (and its related code) of how it would look like :
With the answer from #tektiv, your yAxis always starts at 0.
This is a working example without the use of yAxe.min, so
you can use it (for example, with beginAtZero:false) and the yAxe scales automatically with your data.
Line plugin:
var canvas = document.getElementById("barCanvas");
var ctx = canvas.getContext('2d');
Chart.pluginService.register({
afterDraw: function(chart) {
if (typeof chart.config.options.lineAt != 'undefined') {
var lineAt = chart.config.options.lineAt;
var ctxPlugin = chart.chart.ctx;
var xAxe = chart.scales[chart.config.options.scales.xAxes[0].id];
var yAxe = chart.scales[chart.config.options.scales.yAxes[0].id];
ctxPlugin.strokeStyle = "red";
ctxPlugin.beginPath();
lineAt = yAxe.getPixelForValue(lineAt);
ctxPlugin.moveTo(xAxe.left, lineAt);
ctxPlugin.lineTo(xAxe.right, lineAt);
ctxPlugin.stroke();
}
}
});
Chart:
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],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255,99,132,1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
lineAt: 14,
scales: {
yAxes: [{
ticks: {
beginAtZero:false
}
}]
},
}
});