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When i use charts.js -plugins-datalabels in my page with 2 Charts , Only the first charts show up and the second one is disappeared from the page'
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/chart.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels#2.1.0/dist/chartjs-plugin- datalabels.min.js"></script>
First Chart
<div class="row">
<div class="col-md-4 text-center"> {{ccmonth}}
<canvas id="myChart7" height ="400"></canvas>
<script>
// setup
const data = {
labels: ['Central', 'Eastern', 'Western', 'Kingdom'],
datasets: [{
label: 'Sales',
data: [{{ordordc_month}}, {{ordorde_month}}, {{ordordw_month}},{{ordord_month}}],
backgroundColor: [
'rgba(54, 162, 235, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(54, 162, 235, 0.2)'
],
borderColor: [
'rgba(255, 26, 104, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(0, 0, 0, 1)'
],
borderWidth: 1
},{
label: 'Target',
data: [50000, 50000, 50000, 40000,],
backgroundColor:'rgba(255, 26, 104, 0.2)',
borderColor: 'rgba(255, 26, 104, 1)',
borderWidth: 1
}]
};
// config
const config1 = {
type: 'bar',
data,
options: {
scales: {
x: {
stacked: true
},
y: {
beginAtZero: true,
stacked: true
}
}
},
plugins: [ChartDataLabels],
};
// render init block
const myChart7 = new Chart(
document.getElementById('myChart7'),
config1
);
</script>
</div>
</div>
Second chart (not shown up)
<div class="row">
<div class="col-md-4 text-center"> Week {{lweek}} Achievment
<canvas id="myChart6" height ="400"></canvas>
<script>
// setup
const data = {
labels: ['Central', 'Eastern', 'Western', 'Kingdom'],
datasets: [{
label: 'Sales',
data: [{{ordordc}}, {{ordorde}}, {{ordordw}},{{ordord}}],
backgroundColor: [
'rgba(54, 162, 235, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(54, 162, 235, 0.2)'
],
borderColor: [
'rgba(255, 26, 104, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(0, 0, 0, 1)'
],
borderWidth: 1
},{
label: 'Target',
data: [50000, 50000, 50000, 40000,],
backgroundColor:'rgba(255, 26, 104, 0.2)',
borderColor: 'rgba(255, 26, 104, 1)',
borderWidth: 1
}]
};
// config
const config = {
type: 'bar',
data,
options: {
scales: {
x: {
stacked: true
},
y: {
beginAtZero: true,
stacked: true
}
}
},
plugins: [ChartDataLabels],
};
// render init block
const myChart6 = new Chart(
document.getElementById('myChart6'),
config
);
</script>
</div>
</div>
I tried to search in your awesome , and read the docommentation of the plugins-datalabels.
I expect a solution by one of your greatest users
I'm new to Vue3 and Chart.js and I couldn't figure out how to solve this issue. I'm keep getting the same error over and over. Can someone please help me?
TypeError: Cannot read properties of null (reading 'getContext')
Here is my template:
<template>
<div class="border border-dark rounded container m-2">
<canvas id="myChart" width="400" height="400"></canvas>
</div>
</template>
and my script:
import Chart from 'chart.js/auto'
export default {
mounted() {
const ctx = document.getElementById("myChart").getContext('2d');
const 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: {
y: {
beginAtZero: true
}
}
}
});
console.log('mounted')
}
And I have one more question, when I run this code I get null. Is this normal?
console.log(document.getElementById("myChart"))
I have a chart.js line chart where the x axis labels are plain old numbers, e.g. [2,4,15,45,90], which represent days on this chart. I don't want the x-axis ticks to mirror the data labels, i want the ticks to be at interval of 20. How can I achieve this?
This in my options does nothing:
xAxes: [ {
display: true,
position: 'bottom',
ticks: {
stepSize: 20,
min: 0,
max: 140
}
],
example here: jsfiddle
...the only (awful) way i found is to turn the numbers into dates and in the ticks callback, calculate the number of days difference. as seen here
You could use a scatter chart that accepts the data as individual points, objects with properties x and y. To turn a scatter chart back to a line chart, simply define showLine: true on each dataset.
To product data as individual points, you can defined labels outside of the chart and convert both value arrays using Array.map() as follows.
valueArray.map((v, i) => ({ x: labels[i], y: v }))
The last thing to do is defining xAxis.ticks as follows:
ticks: {
stepSize: 1,
autoSkip: false,
callback: value => value % 20 == 0 ? value : null,
min: labels[0],
max: labels[labels.length - 1],
maxRotation: 0
},
Please have a look at your amended code below:
const labels = [7, 14, 21, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105, 119, 126];
var myChart = new Chart('myChart', {
type: 'scatter',
data: {
datasets: [{
label: 'IC',
data: [9432.13209267, 1899.132847, 851.2122668, 3964.48968367, 9433, 8087.04121533, 1268.34642367, 825.29800317, 4271.00722867, 1157.57453933, 4928.214994, 783.88204033, 1846.623016, 4001.84214867, 709.70201067, 3917.61792167, 688.1571182].map((v, i) => ({ x: labels[i], y: v })),
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)'
],
showLine: true,
borderWidth: 1
},
{
label: 'Mtb',
data: [14241.41334667, 48348.08833, 5055.28134533, 7614.80689233, 14240, 24536.66203, 1083.99264, 144.72451603, 15968.94539333, 160.150183, 5127.77524033, 953.9963646, 0, 2989.36556, 21.32920023, 27.03159138, 60310.22952333].map((v, i) => ({ x: labels[i], y: v })),
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)'
],
showLine: true,
borderWidth: 1
}
]
},
options: {
scales: {
xAxes: [{
display: true,
position: 'bottom',
ticks: {
stepSize: 1,
autoSkip: false,
callback: value => value % 20 == 0 ? value : null,
min: labels[0],
max: labels[labels.length - 1],
maxRotation: 0
},
// afterBuildTicks: (axis, ticks) => [0, 20, 40, 60, 80, 100, 120],
scaleLabel: {
display: true,
labelString: 'Days from initial test',
fontSize: 16
}
}],
yAxes: [{
display: true,
position: 'left',
ticks: {
beginAtZero: true,
stepSize: 10000,
min: 0,
max: 70000
},
scaleLabel: {
display: true,
fontSize: 16
}
},
{
display: true,
position: 'right',
ticks: {
beginAtZero: true,
stepSize: 10000,
min: 0,
max: 70000
},
scaleLabel: {
display: true,
fontSize: 16
}
},
]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="myChart" height="100"></canvas>
I have script for chart.js like this:
<script>
var ctx = document.getElementById("chart0");
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: [2018-03-28,2018-03-29,2018-03-30,2018-03-31,2018-04-01,2018-04-02,2018-04-03,2018-04-04,2018-04-05,2018-04-06,2018-04-07,2018-04-08,2018-04-09,2018-04-10,2018-04-11,2018-04-12,2018-04-13,2018-04-14,2018-04-15,2018-04-16,2018-04-17,2018-04-18,2018-04-19,2018-04-20,2018-04-21,2018-04-22,2018-04-23,2018-04-24,2018-04-25,2018-04-26,2018-04-27],
datasets: [{
label: 'Impressions',
data: [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,19,0],
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: {
xAxes: [{
ticks: {
min: '2018-03-28',
max: '2018-04-27'
}
}]
}
}
});
</script>
But the display chart showing wrong xasis like this image:
chart display wrong date time
Please help me to fix this. This is the first time I working with chart.js
Thanks in the best!
Modify the dataset like this:
datasets: [{
label: 'Impressions',
data: [
{
x: new Date('2018-03-28'),
y: 0
}, {
x: new Date('2018-03-29'),
y: 0
},
{
x: new Date('2018-03-30'),
y: 0
}
...
And the 'options' should be:
options: {
scales: {
xAxes: [{
type: 'time'
}]
}
}
I need to get a chart like this:
I find this example but it uses old version of ChartJs. I try it using v2.0 but I don't get it.
Can someone post a example?
With v2.1.x, you can achieve this using the stacked option
...
options: {
scales:{
xAxes: [{
stacked: true
}],
yAxes: [{
stacked: true
}]
}
}
...
Stack Snippet
var config = {
type: 'bar',
data: {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
type: 'line',
label: 'Dataset 2',
data: [-65, -10, -80, -81, -56, -85, 40],
borderColor: 'black',
fill: false
}, {
type: 'bar',
label: 'Dataset 1',
backgroundColor: "red",
data: [65, 0, 80, 81, 56, 85, 40],
}, {
type: 'bar',
label: 'Dataset 3',
backgroundColor: "blue",
data: [-65, 0, -80, -81, -56, -85, -40]
}]
},
options: {
scales: {
xAxes: [{
stacked: true
}],
yAxes: [{
stacked: true
}]
}
}
};
var ctx = document.getElementById("myChart").getContext("2d");
new Chart(ctx, config);
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.1.0/Chart.bundle.min.js"></script>
<canvas id="myChart"></canvas>
After fiddling forever, I finally got it to work, here's a sample. Somebody please update the docs!
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes 1',
data: [10, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(255, 99, 132, 0.2)',
'rgba(255, 99, 132, 0.2)',
'rgba(255, 99, 132, 0.2)',
'rgba(255, 99, 132, 0.2)',
'rgba(255, 99, 132, 0.2)'
],
borderColor: [
'rgba(255,99,132,1)',
'rgba(255,99,132,1)',
'rgba(255,99,132,1)',
'rgba(255,99,132,1)',
'rgba(255,99,132,1)',
'rgba(255,99,132,1)'
],
borderWidth: 2
},
{
label: '# of Votes 2',
data: [15, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 159, 64, 0.2)',
'rgba(255, 159, 64, 0.2)',
'rgba(255, 159, 64, 0.2)',
'rgba(255, 159, 64, 0.2)',
'rgba(255, 159, 64, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255, 159, 64, 1)',
'rgba(255, 159, 64, 1)',
'rgba(255, 159, 64, 1)',
'rgba(255, 159, 64, 1)',
'rgba(255, 159, 64, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 2
}
]
},
options: {
scales: {
yAxes: [{
stacked: true,
ticks: {
beginAtZero: true
}
}],
xAxes: [{
stacked: true,
ticks: {
beginAtZero: true
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id="myChart" width="400" height="400"></canvas>
Just make sure that you provide an array of object(s), not just one object for xAxis and yAxis.
"options": {
"scales": {
"xAxes": [
{
"stacked": true
}
],
"yAxes": [
{
"stacked": true
}
]
}
}