I am working on a project using chart.js for work and I need to know if there is a way to add some space between datasets of a pie chart.
What I have so far is in the chart depicted below, and I want there to be some padding between the inner and outer datasets.
I have tried setting one of the charts to a doughnut type or adding a thicker outer border on the inner chart, and neither of those are what I needed.
You can obtain the desired result by adding an empty dataset between the two existing ones and defining a weight property on the empty and the inner dataset.
const colors = ["#FF6384", "#36A2EB", "#FFCE56"];
var pieChart = new Chart("myChart", {
type: 'pie',
data: {
labels: ["Red", "Blue", "Yellow"],
datasets: [{
data: [8, 5, 6],
backgroundColor: colors,
},
{
weight: 0.2
},
{
data: [5, 7, 4],
backgroundColor: colors,
weight: 1.2
}]
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="myChart"></canvas>
Related
I'm trying to create a mix chart, a bar chart with a line chart. Below is a picture of a standard example.
I need to change the x-axis as shown in the picture below, how can I do that?
In other words, I want to remove the dependence of x-axis labels on the number of bars and their points and make the x-axis arbitrary, which sets the maximum and minimum values and its step
Change the labels as shown in this example:
const data = {
// Put whatever you want
labels: [0, 5, 10, 15, 20],
datasets: [
{
/* ........ */
},
]
};
I found a solution, we need to add a new dataset and bind it to a custom X axis.
datasets: [{
type: chartTypes.Line,
xAxisID: 'custom-X-axis',
},
/*...*/]
Then we need to add this custom axis and hide the default one
scales: {
xAxes: [
{
display: false,
}, {
id: 'custom-X-axis',
type: 'linear',
ticks: {
min: 0,
max: 20,
}
}
],
}
I've got a horizontal stacked bar chart rendered in Chart.js, and the legend corresponds to the different classes. Here's a bit of it (working on a dummy dataset, disregard the nonsense names):
The labels on the left are users, the labels in the legend (which correspond to the classes in the bar chart, i.e. the different datasets) are mailing lists. The chart, basically, shows how many users are members of specific mailing lists; the length of the bar is how many mailing lists a given user is a member of.
What I'd like to do is set it up so hovering over an entry in the legend will highlight (ideally with a border or something) the portions of the bar chart corresponding to that dataset. So if I hovered over the first dataset entry, the blue block at the left end of all those bars (except "anionic") would get a highlight.
Using the onHover and onLeave events for the legend, I'm successfully console.log'ing the currently-hovered dataset index. But I can't figure out how to make the bar elements belonging to that dataset highlight.
With the new upcomming release of version 3 you can do this with the setActive elements.
Documentation: https://www.chartjs.org/docs/master/developers/api/#setactiveelementsactiveelements
var options = {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderWidth: 1,
hoverBackgroundColor: 'green',
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderWidth: 1,
hoverBackgroundColor: 'red',
}
]
},
options: {
scales: {}
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
const chart = new Chart(ctx, options);
chart.setActiveElements([{
datasetIndex: 0,
index: 1,
}, {
datasetIndex: 1,
index: 1,
}]);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.0.0-beta.10/chart.js" integrity="sha512-7igYTuENB1pHNsZ/SyzMYrcJAmRCk084yVOsxNNCQAdX1wSYvCeBOgSOMC6wUdKMO76kCJNOpW4jY3UW5CoBnA==" crossorigin="anonymous"></script>
</body>
Using ChartJS 3 setActiveElements API, you can highlight an entire dataset on legend hover using the following code in options.plugins.legend
onHover: function (event, legendItem) {
const datasetIndex = legendItem.datasetIndex;
let elementList = [];
for (let i = 0; i < this.chart.getDatasetMeta(datasetIndex).data.length; i++) {
elementList.push({
'datasetIndex': datasetIndex,
'index': i,
});
}
this.chart.setActiveElements(elementList);
this.chart.update();
}
I have two bootstrap columns side by side in which I want to show two related Chart.js doughnut charts. I want to include the legends, so one can easily see the meaning without interactively hovering with the mouse.
The thing is, when Chart.js plots the two doughnut charts, the sizes of the actual charts differ, because the legend in one chart takes up more space comparatively.
What I'd like is to have two doughnut charts side by side, that scale responsively, and where I am certain the actual doughnut is the same size.
Link to jsfiddle here: https://jsfiddle.net/emc86oux/1/
var chart = new Chart('plot1', {
type: 'doughnut',
data: {
datasets: [{
data: [3,6,10,6,1],
}],
labels: ["Lorem","ipsum","dolor","sit","amet"]
},
options: {
legend: {
align: "end",
position: "bottom"
},
responsive: true,
aspectRatio: 1
}
});
var chart = new Chart('plot2', {
type: 'doughnut',
data: {
datasets: [{
data: [6, 5, 9, 7, 8, 4, 1, 2, 3, 10, 5],
}],
labels: ["On", "the", "other", "hand", "we", "denounce", "with", "righteous", "indignation", "and", "dislike"]
},
options: {
legend: {
align: "end",
position: "bottom"
},
responsive: true,
aspectRatio: 1
}
});
I ended up using the approach described here, where HTML legends are added in separate div's. I modified the approach for doughnut charts, which set up the chart data slightly differently than bar charts.
I already have a graph using chartJS as shown below and the code for that is :
r_chart_data = [[-0.001, 2.052],[-2.385, 2.052]];
dr_chart_data = [[-0.01, 1.83],[1.05, 2.83],[1.05, 2.83]];
myChart = new Chart(ctx, {
type: 'horizontalBar',
data: {
labels: label,
datasets: [{
label : 'DataSet1',
data: r_chart_data,
backgroundColor: 'rgb(255, 99, 132)'
},
{
label : 'DataSet2',
data: dr_chart_data,
backgroundColor: 'lightblue'
}
]
},
options: {
lineAtIndex : level,
scales: {
xAxes: [{
ticks: {
min: -5,
max: 5,
stepSize: 0.5,
}
}]
}
}
});
But what if my
r_chart_data[0] i.e. [-0.001,2.052]
is not a continuos range and instead its value is something like
[[-0.001,1.023],[1.5,2.052]]
then how should I plot the graph. Modified r_chart_data:
r_chart_data = [[[-0.001,1.023],[1.5,2.052]],[-2.385, 2.052]];
Similarly if I have a range of data sets that I need to plot in the form of a horizontal bar graph using ChartJS. The data set which are in the form of:
dataset1: [[-10,-4],[-2,2],[4,6]] // should be plotted in a single bar graph
dataset2: [[-2,1],[1.5,3.5],[5.2,8.9]] //should be plotted in a second bar
dataset3: [[2,4],[5,7]] //third bar
.. and so on
Moreover, each dataset need not have three range items. It can have one, two or any number of range items.
I am using chart.js line chart. I can use the chart correctly but if I have only one plot point then the chart doesn't create a line from start to that point. I want to draw a line from the start of the chart to that single plot point without placing a plot point on that first day as we don't have data in the database for it.
Current chart behaviour:
Need a line like drawn here from the start of the chart:
Is this possible to draw a line on the chart from start to that point? Maybe some start point property or a hidden x-axis attribute on the chart to achieve this?
Also, any possible way to remove that space from top before that "Extreme" point on Y-Axis?
I have done hard research on it, have read the docs multiple times but unable to achieve them.
Have you tried Area charts with fill set to false? Check out the samples here https://www.chartjs.org/samples/latest/charts/area/line-boundaries.html
It's kind of a hack but you can append the data with an extra point and update its styles to keep it hidden, Refer to our fiddle https://jsfiddle.net/hpdr5jf1/
Relative code
var options = {
type: 'line',
data: {
labels: ["", "Actual Data"],
datasets: [
{
label: 'Data Point',
data: [12, 12],
pointRadius: [0],
pointHitRadius: [0],
borderWidth: 1,
fill: false,
borderColor: 'red'
}
]
},
options: {
scales: {
yAxes: [{
ticks: {
reverse: false
}
}]
}
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
var myChart = new Chart(ctx, options);