I am trying to draw a chart by passing values for labels and data dynamically using char.js.
The chart.js module refuses to accept the labels when passed as a variable.
When I hardcode it, it works just fine.
The label variable prints out the values on the page and seems to be correct in format.
Very similar to the problem described in the below query, except that I am already using a proper array.
[https://stackoverflow.com/questions/60453491/chart-js-not-showing-data-when-pass-dynamic-labels][1]
mypage.html:
<script src="https://cdn.jsdelivr.net/npm/chart.js#2.9.4"></script>
{{Messages.vm_size_in_use_labels}}
{{Messages.vm_size_in_use_data}}
<canvas id="chart" width="50" height="50"></canvas>
<script lang="JavaScript">
let ctx = document.getElementById("chart").getContext("2d");
let chart = new Chart(ctx, {
type: "pie",
data: {
labels: {{Messages.vm_size_in_use_labels}},
datasets: [
{
label: "Gross volume ($)",
backgroundColor: "#79AEC8",
borderColor: "#417690",
data: {{Messages.vm_size_in_use_data}},
}
]
},
options: {
title: {
text: "Gross Volume in 2020",
display: true
}
}
});
</script>
The page shows the printed value correctly but chart doesn't display:
['Standard_B1ls', 'Standard_D2_v2', 'Standard_D4s_v3', 'Standard_B1s']
[3, 3, 1, 1]
If I change the label to hard values,
labels: ['Standard_B1ls', 'Standard_D2_v2', 'Standard_D4s_v3', 'Standard_B1s'],
this works just fine and chart is displayed.
Not sure what is missing here. the framework is django if it matters.
Related
Chart JS 3.9.1
Laravel 9.x
There are 50 thousand questions using 20 different versions and none of them, from what I have found are helpful. I have checked the version, checked the docs, and even checked the page source to see if data was in place. No Errors, No Chart, Nothing.
In a blade file I have done:
<div>
<canvas id="item-listing-data" width="400" height="400"></canvas>
</div>
#push('scripts')
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
<script>
const ctx = document.getElementById('item-listing-data').getContext('2d');
const saleDataChart = new Chart(ctx, {
type: 'line',
labels: #json($saleData['labels']),
datasets: [{
label: 'Sale Data',
data: #json($saleData['data']),
fill: false,
borderColor: 'rgb(34, 67, 156)',
tension: 0.1
}]
});
</script>
#endpush
As far as I know, from the docs this is what you do. This is how you render the chart.
If I inspect the page to see the JS that gets spit out:
const ctx = document.getElementById('item-listing-data');
const saleDataChart = new Chart(ctx, {
type: 'line',
labels: ["Mon Aug 2022 14:08:13"],
datasets: [{
label: 'Sale Data',
data: [10000],
fill: false,
borderColor: 'rgb(34, 67, 156)',
tension: 0.1
}]
});
Looks right to me.
When I investigate the page I see a div that is way too large, the canvas element - but Im sure that can be fixed with options, and no chart. Just an empty canvas.
Again, I know this question has been asked a thousand times, but I:
Followed the docs
Checked for issues in my code
Made sure I was loading the correct version of chart js
And still no chart, no errors, nothing.
Even if I replace labels and data with [1,2,3] - Nothing, no chart, no errors.
Thoughts?
AFA I can see, the issue seems to be in the chart configuration and the data node is missing.
Without it, the chart doesn't have data to show.
The code should be:
<div>
<canvas id="item-listing-data" width="400" height="400"></canvas>
</div>
#push('scripts')
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
<script>
const ctx = document.getElementById('item-listing-data').getContext('2d');
const saleDataChart = new Chart(ctx, {
type: 'line',
data: { // <--- this was missing
labels: #json($saleData['labels']),
datasets: [{
label: 'Sale Data',
data: #json($saleData['data']),
fill: false,
borderColor: 'rgb(34, 67, 156)',
tension: 0.1
}]
}
});
</script>
#endpush
I'm using Chart.JS v 2.9.3 to create a line chart
line-chart diagram to show the month-wise total of expenses of selected product
For example, if the user select XYZ product then this charts would show the monthly expenses [Jan-2021-Dec-2021]
and if that respective product expense only present Jan-2021 then it displays month on y-Axes at staring
here is jsfiddle example
Adding offset trick I had already tried xAxes : [{ offset:true }],
var config = {
type: 'line',
data: {
labels: ["jan-2021"],
datasets: [{
label: "month-year",
data: [65],
backgroundColor: "rgb(118, 101, 228)",
}],
},
scales : {
xAxes : [{
offset:true
}],
},
};
var ctx = document.getElementById("myChart").getContext("2d");
new Chart(ctx, config);
<div class="myChart">
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.bundle.js"></script>
<canvas id="myChart"></canvas>
</div>
please refer to the above image for getting an idea of what I'm trying to archive, I'm not concern about dot that on the chart
As you can see, the points are stick to the y-axis. Is there a possibility to center the line chart when only one data is present in the diagram?
Chart.js does not support this kind of use case since it gives a distorted image of your chart since point and label don't align anymore. If you really want this you can check beforehand in your code if there is only 1 data point there. If this is the case add an empty string in your labels array in the front and back and add zero at the front of back of your data array (or a slightly lower value as your single datapoint so that the scales don't get big steps) like so:
var config = {
type: 'line',
data: {
labels: ["", "January-2021", ""],
datasets: [{
label: "month-year",
data: [0, 134335066, 0],
backgroundColor: "rgb(118, 101, 228)",
}],
},
scales: {},
};
var ctx = document.getElementById("myChart").getContext("2d");
new Chart(ctx, config);
<div class="myChart">
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.bundle.js"></script>
<canvas id="myChart"></canvas>
</div>
You can use align option:
var mybarChart = new Chart(ctx, {
type: 'bar',
responsive: true,
data: data,
options: {
legend: {
display: false,
position: 'bottom',
align: 'center'
},
var config = {
type: 'line',
data: {
labels: ["", "January-2021", ""],
datasets: [{
label: "month-year",
data: [0, 134335066, 0],
backgroundColor: "rgb(118, 101, 228)",
}],
options: {
legend: {
display: false,
position: 'bottom',
align: 'center'
},
},
scales: {},
};
refer to this
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);
I'm using CanvasJs for the first time for my charts but I noticed that everytime a value is zero the graph doesn't display this. I'm using a chart which combines a line chart and a bar chart so this is important to show if there has been zero change between the two values. The piece of code for the line graph is as follows:
{
type: "line",
name: "Cumulatief",
showInLegend: true,
yValueFormatString: "€#",
dataPoints: [
{ x: new Date(dateValue1) , y: 0 }
]
}
I hope that someone can help me so that I can display the value zero on the line chart.
Y-value 0 is being rendered irrespective of chart-type is line or column and seems to be working fine.
However value 0 is not being displayed in toolTip as you are setting yValueFormatString to '€#'. Changing it to '€0' will work fine in this case. Check the working code below:
var chart = new CanvasJS.Chart("chartContainer", {
data: [{
type: "line",
name: "Cumulatief",
showInLegend: true,
yValueFormatString: "€0",
dataPoints: [
{ x: new Date(2018,03,19) , y: 0 }
]
}]
});
chart.render();
<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<div id="chartContainer" style="height: 260px; width: 100%;"></div>
I'm using chart.js from http://www.chartjs.org/.
I want to draw a pie chart, but nothing is displaying. I managed to draw line chart, so the Javascript is loaded.
HTML
<!-- Chart -->
<script type="text/javascript" src="_javascripts/chart/Chart.min.js"></script>
<!-- //Chart-->
<canvas id="browsersChart" width="400" height="100"></canvas>
<script>
var ctx = document.getElementById("browsersChart");
var myChart = new Chart(ctx, {
type: 'pie',
data: {
datasets: [{
label: 'Browsers',
data: [14, 2, 2, 2, 1],
backgroundColor: [
window.chartColors.red,
window.chartColors.orange,
window.chartColors.yellow,
window.chartColors.green,
window.chartColors.blue,
],
}],
labels: [
"Chrome"
"Firefox"
""
"MSIE"
"Mobile Safari"
]
},
options: {
responsive: true
}
};
</script>
You have some typos in your code.
In the labels section, you need a comma after each label:
labels: [
"Chrome", // These commas at the end need added.
"Firefox",
"",
"MSIE",
"Mobile Safari"
]
You also need to add a ) at the very end of the Chart declaration:
options: {
responsive: true
}
}); // The rounded bracket here needs added
In the future, you should use the dev tools in your browser. The Console tab will tell you about errors like these. It explained exactly what line had errors.
After fixing these typos, I got a pie chart just as expected.