I am trying to create a visitors bar chart with included values, for example:
I want to show a bar chart of total daily visitors, and that bar should contain info of total visitors and first time visitors.
so data for a bar should look like:
data: {
labels: getDataAttributes(data, 'data-date'),
// an array holding the date of each bar (custom function)
// for example purposes lets say its just 3 bars
datasets: [{
label: ['Number of visitors', 'Number of new visitors'],
data: [[20,15], [25,10], [30, 15]],
// Here if we would use a simple stacked bar chart the height would be the sum of 2 values
// e.g.(20+15=35), but I wish that the bar height would be the number of total visitors 20
// the tooltip should contain values of total visitors and new visitors respectively 20 and 15
}]
}
I looked in the chartjs documentation, but found only examples with stacked values and that solution is not applied in my desired design, can someone please reference documentation/articles/tutorials or personal experience or perhaps I should switch to d3js? Thanks.
You could define two datasets, the first one would contain the values of new visitors, the second one the values of all visitors.
Then you would define the x-axis as being stacked:
options: {
scales: {
xAxes: [{
stacked: true
}],
Please take a look at below runnable code snippet to see how it works:
const baseData = [[20,15], [25,10], [30, 15]];
new Chart('chart', {
type: 'bar',
data: {
labels: ['25.10.2020', '26.10.2020', '27.10.2020'],
datasets: [{
label: 'Number of new visitors',
data: baseData.map(v => v[1]),
backgroundColor: 'green'
},
{
label: 'Number of visitors',
data: baseData.map(v => v[0]),
backgroundColor: 'blue'
}]
},
options: {
scales: {
xAxes: [{
stacked: true
}],
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.min.js"></script>
<canvas id="chart" height="100"></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 would like to make a chart with labels on xAxes and the same labels in the legend. I was trying different solutions, but the best I got is the snippet below. I don't understand, why all bars are connected with my first label. Could you please help me to fix it?
I found a solution with would be almost perfect here, but unfortunately, it doesn't work as expected: after clicking on the label in legend all charts are hiding, not only one corresponding to the label I clicked.
var canvas2 = document.getElementById("wykres_kategorie");
var ctxD2 = canvas2.getContext('2d');
var myLineChart = new Chart(ctxD2, {
type: 'bar',
data: {
labels: [
'a','b','c'
],
datasets: [
{
label: 'a',
data: [ 60 ],
backgroundColor: [ 'red' ],
},
{
label: 'b',
data: [ 80 ],
backgroundColor: [ 'blue' ],
},
{
label: 'c',
data: [ 50 ],
backgroundColor: [ 'yellow' ],
},
]
},
options: {
legend: {
position: 'bottom'
},
responsive: true,
scales: { xAxes: [{
ticks: {
autoSkip: false
} }],
yAxes:[{ ticks: {beginAtZero: true}}]}
}
});
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.20.0/js/mdb.min.js"></script>
<canvas class='col-12 mx-auto' id="wykres_kategorie"></canvas>
The data.labels defines the ticks for a category axis. Following your configuration, the chart is expecting to have 3 data items for dataset, (first at tick 'a', second at tick 'b', third at tick 'c').
Instead, the dataset.label are used in the legend.
In your config, all datasets have got only 1 value and all values are related to the first data.labels, 'a'.
I am trying to create a series of line chart dynamically and then update them once the data has been updated for a particular user in real-time.
I am running into difficulty because I can only get the most recent one to render.
I think this is because when the following code runs it overwrites the ctx variable and I lose the earlier charts.
I tried the following technique with dynamic variables so no two ctx variables would be the same, but it doesn't work.
Thanks in advance for your help.
window['ctx_'+userid] = document.getElementById("forceCurveGraph_"+userid).getContext("2d");
window['myLineChart'+userid] = new Chart(window['ctx_'+userid], {
type: 'line', data: {
datasets: [{
label: "Force Curve",
data: forcecurvedata, backgroundColor: ['rgba(57,118,251, 0.8)']
}],
labels: labels
}, options: {
backgroundColor: ['rgba(40, 84, 141, 0.3)'],
scales: {
yAxes: [{
ticks: {
beginAtZero: true,
max: graphMax
}
}],
xAxes: [{
ticks: {
display: false
}
}]
}
}
})
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 trying to plot a bar chart with multiple datasets on a time series, however some of the data gets lost along the way.
for simplicity I have removed the ajax call and plotted some data:-
var config = {
type: 'bar',
data: {
datasets: [{
label: "Dataset 1",
data: [{
x: new Date('2017-03-01'),
y: 1
}, {
x: new Date('2017-03-02'),
y: 2
}, {
x: new Date('2017-03-03'),
y: 3
}, {
x: new Date('2017-03-04'),
y: 4
}],
backgroundColor: "red"
}, {
label: "Dataset 2",
data: [{
x: new Date('2017-03-01'),
y: 1
}, {
x: new Date('2017-03-02'),
y: 2
}, {
x: new Date('2017-03-03'),
y: 3
}, {
x: new Date('2017-03-04'),
y: 4
}],
backgroundColor: "blue"
}]
},
options: {
scales: {
xAxes: [{
type: "time",
time: {
unit: 'day',
round: 'day',
displayFormats: {
day: 'MMM D'
}
}
}],
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
}
var ctx = document.getElementById("canvas").getContext("2d");
window.myLine = new Chart(ctx, config);
using the above configuration dataset 1 point 1 and dataset 2 point 4 (so basically the first and last points) do not get drawn.
Any ideas where I am going wrong here?
Also I am using this time series version because I was hoping to have "gaps" in the chart, for example dataset 1 might have a series for 2017-03-01 and dataset 2 might not, in this case dataset 2's next date will bunch up to dataset 1's making it look like it does belong to that date.
Any help would be appreciated
I had the exact same issue when displaying a bar chart with time as the X axes.
Inside your xAxes you need to add an additional configuration option:
xAxes: [{
offset: true
}]
Description from the ChartJS documentation:
If true, extra space is added to the both edges and the axis is scaled to fit into the chart area. This is set to true in the bar chart by default.
ChartJS Documentation Cartesian