What I want to do it change the Z order of of a line on this chart based on the label attribute. For example, here I would like to make "Label2" plot on top. What I tried to do was mutate the data_all array to put the element I want on top first in the list, though I could not get that work. How can I change the plot order?
So I am creating an array of objects that I can put right into the "data part of chart js like so
data_all=[]
var s1 = {
label: 'Label1',
borderColor: '#00ffff',
fill: false,
data: [
{x: '2021-06-25 11:00:00', y:50.5401942},
{x: '2021-06-25 12:00:00', y:49.9631549},
{x: '2021-06-25 13:00:00', y:50.0555899}]
data_all.push(s1)
var s2 = {
label: 'Label2',
borderColor: '#00ffff',
fill: false,
data: [
{x: '2021-06-25 11:00:00', y:50.5401942},
{x: '2021-06-25 12:00:00', y:49.9631549},
{x: '2021-06-25 13:00:00', y:50.0555899}]
data_all.push(s2)
Then I create a chart by passing data_all in to a chart variable.
var ctx = document.getElementById('plotAll').getContext('2d');
var plotall = new Chart(ctx, {
type: 'line',
data: { datasets: data_all },
options: {
responsive: true,
zoom: {
enabled: true,
mode: 'x'
},
pan: {
enabled: true,
mode: 'xy'
},
scales: {
xAxes: [{
type: 'time'
}]
},
}
});
You can make use of the order property in the dataset, the lower this is, the sooner it will draw that dataset, see example, noramally red line would overlap blue line, now its reversed:
var options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'red',
order: 1
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderColor: 'blue',
order: 0
}
]
},
options: {}
}
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>
Related
I am trying to set min/max starting values to scale and circular grid to a radar in chartjs, but none seens to work.
const chart1 = new Chart($('#chart-area1'), {
type: 'radar',
data: {
labels: ['test1', 'test2', 'test3'],
datasets: [{
label: '1',
data: [20, 25, 55],
borderColor: setup_borderColor[0],
backgroundColor: setup_backgroundColor[0],
borderWidth: 1
},{
label: '2',
data: [25, 35, 40],
borderColor: setup_borderColor[1],
backgroundColor: setup_backgroundColor[1],
borderWidth: 1
}]
},
options: {
scale: {
min: 0,
max: 100,
},
scales: {
r: {
grid: {
circular: true
}
}
}
}
});
The radar chartjs should start at 0 with a max value at 100 and be a circular grid, but both options dont work, my result:
Result:
Chartjs version: Chart.js v2.9.3
You are mixing V2 and V3 syntax in all the wrong ways, in V2 you need to use the scale option not scales.r and the min/max have to be configured in the ticks part not in the root and grid must be gridLines:
var options = {
type: 'radar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'pink'
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderColor: 'orange'
}
]
},
options: {
scale: {
ticks: {
max: 40,
min: 0
},
gridLines: {
circular: true
}
}
}
}
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/2.9.4/Chart.js"></script>
</body>
For more info you can read the 2.9.4 documentation
I have a little experience with chartjs but I am unable to find a way to hide the default line. I'm adding this image here which I need to fix.
I need to hide the line like this one
https://i.stack.imgur.com/UXMpi.png.
I need to make it like this one
https://i.stack.imgur.com/Phsos.png
If anyone knows how to do this, please let me know. Thanks.
set display to false in the grid settings of the x axis and drawBorder to false in both axes like so:
const options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'orange'
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderColor: 'pink'
}
]
},
options: {
scales: {
x: {
grid: {
display: false,
drawBorder: false
}
},
y: {
grid: {
drawBorder: false
}
}
}
}
}
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/3.8.0/chart.js"></script>
</body>
I'm new to programming and I'm trying to make a custom legend for my chart, how can I use the "hidden" property for when I click on it, it will be stroke,
when I do "hidden: true" they all get strikethrough, not only the one I clicked
Ps: I'm using 2.9.4 version of chart.js
Here is my code
legend: {
display: true,
labels: {
generateLabels: (chart) =>
chart.data.datasets.map((dataset, i) => ({
datasetIndex: i,
text: dataset.label,
fillStyle: dataset.backgroundColor,
strokeStyle: dataset.borderColor
})),
fontSize: 10,
boxWidth: 10,
},
}
You can use the isDatasetVisible method on the chart object with the current dataset index to check if it is hidden. This returns a boolean so you can put it in there right away after inversing it.
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
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderWidth: 1
}
]
},
options: {
legend: {
labels: {
generateLabels: (chart) =>
chart.data.datasets.map((dataset, i) => ({
datasetIndex: i,
text: dataset.label,
fillStyle: dataset.backgroundColor,
strokeStyle: dataset.borderColor,
hidden: !chart.isDatasetVisible(i),
})),
}
}
}
}
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/2.9.4/Chart.js"></script>
</body>
I have a chartjs line chart that has multiple lines like that;
I have been trying to add a date-time selector but I am not able to update my chart because I don't get how to reach the datas of my chart. Here is my chart decleration;
var ctx = document.getElementById('canvas');
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: time1, time2,
datasets: [
{
label: 'Temperature - 1',
data: temp1,
backgroundColor: 'transparent',
borderColor: 'red',
borderWidth: 3
},
{
label: 'Temperature - 2',
data: temp2,
backgroundColor: 'transparent',
borderColor: 'purple',
borderWidth: 3
},
{
label: 'Humidity - 1',
data: hum1,
backgroundColor: 'transparent',
borderColor: 'green',
borderWidth: 3
},
{
label: 'Humidity - 2',
data: hum2,
backgroundColor: 'transparent',
borderColor: 'yellow',
borderWidth: 3
}]
},
options: {
elements: {
line: {
tension: 0
}
},
scales: {
y: {
title: "Temperature/Humidity",
beginAtZero: true,
min: 10,
max: 60
}
}
}
});
time1, time2, temp1, temp2, hum1, hum2 are all array. When I want to update the chart using chart.update() function that I read at its own documentation, as I said I don't get it how to reach to data arrays like temp1, temp2.
Something like myChart.data.datasets.data would not work, making them like json;
{first_data:{
label: 'Temperature - 1',
data: temp1,
backgroundColor: 'transparent',
borderColor: 'red',
borderWidth: 3
}},
Doesn't work also, how can I reach to temp1 for example?
SOLUTION:
Because of my carelessness I had asked a nonsense question. Because of myChart.data.datasets is an object, I am able to reach to temp1 like myChart.data.datasets[0].data, sorry everyone
You will need to target the specific dataset you want to get the data from so to get the data of the Temperature - 1 dataset you will need to target it like this: myChart.data.datasets[0].data
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: 'orange'
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderColor: 'pink'
}
]
},
options: {}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
const myChart = new Chart(ctx, options);
console.log(myChart.data.datasets[0].label)
console.log(myChart.data.datasets[0].data)
<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>
I have the below chart using chart.js 3.x.
https://jsfiddle.net/7oxmesnj/1/
I have below chart configuration:
var options = {
type: 'scatter',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [
{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderWidth: 0,
showLine: true,
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderWidth: 0,
showLine: true,
}
]
},
options: {
scales: {
y:{
type: 'linear',
min: 0,
max: 500,
ticks: {
stepSize: 100,
reverse: false
}
},
x:{
type: 'linear',
min: 0,
max: 500,
ticks: {
stepSize: 100,
reverse: false
}
}
}
}
}
I am not able to plot the data on the scatter chart.
I have followed the migration guild, but still no data on chart.
https://www.chartjs.org/docs/master/getting-started/v3-migration
You should change datasets to have pairs of numbers (x, y). See documentation.
var options = {
type: 'scatter',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [{x:12,y:7}, {x:19,y:11}, {x:3,y:5}, {x:5,y:8}, {x:2,y:3}, {x:3,y:7}],
borderWidth: 1,
showLine: true,
pointBackgroundColor: 'red',
borderColor: 'blue',
backgroundColor: 'blue',
}]
},
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
canvas {
background-color: #eee;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.0.0-beta/chart.min.js"></script>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
The main problem in your code is the definition of the x-axis. The x-axis represents the labels, which are strings. Therefore, you cannot define numeric min, max and ticks.stepSize options.
In order to obtain a scatter chart with given data, you could change its type to 'line' and define showLine: false on each dataset.
Please take a look at your amended code below. I changed y
var options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
fill: false,
showLine: false
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
fill: false,
showLine: false
}
]
},
options: {
scales: {
y: {
min: 0,
max: 50,
ticks: {
stepSize: 10
}
}
}
}
};
new Chart('chartJSContainer', options);
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.0.0-beta/chart.min.js"></script>
<canvas id="chartJSContainer"></canvas>