I am using Chart.js v3.4 with Vue3. Here is my chart:
I am wondering if there is a way to remove the tick marks that go past the axis of the chart (pointing to the axis labels) so that the shape is a solid rectangle with labels.
Note: I am already using the drawBorder: false option for the y-axis.
Secondly I want to make it so there are exactly 5 grid lines on the y-axis to keep 4 rows of boxes on the chart at all times. I'm using dynamic data and ranges so the amount of boxes changes depending on the data. (You can see a new box just barely started at the bottom of the chart, I don't want that to be showing). The way I determine the min and max of the chart is by taking the min/max of the data array and subtracting/adding 2 to them.
You can make use of the drawTicks and count propertys to achieve what your want.
Live example:
var options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3]
}]
},
options: {
scales: {
y: {
ticks: {
count: 5,
padding: 10
},
grid: {
drawTicks: false
}
},
x: {
ticks: {
padding: 10
},
grid: {
drawTicks: false
}
}
}
}
}
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 using chart.js for my project. As you can see in the following code, chart.js uses different minimum and maximum values for y-axis for line and bar graphs for same data. In the given code, 1100-1700 is the value range for line graph whereas 0-2000 is the value range used for bar graph.
I like to make same minimum and maximum values for both line and bar graphs. One option is to find minimum, maximum and step-size values my own and use the properties min, max and ticks.stepSize under scales. But finding minimum, maximum and step-size for a given data data is a serious task.
For my requirement, default minimum ,maximum and stepSize used by chart.js for line graph is fine and I would like to use the same values for bar graph also.
I could first render line graph, get these values from this graph (like scales.y.min) and then use it for bar graph, which is perfectly working
Is there a way I could get the default min, max, stepSize values used by chart.js for line graph before actually drawing the graph? Any answers or pointers are really appreciated. Thanks
var chart1 = new Chart(document.getElementById('chart1'),
{
type: 'line',
data:
{
labels: ['a','b','c'],
datasets:
[
{
label: 'A',
data: [1212,1122, 1188, 1617, 1116],
borderColor: 'green',
}
]
}
});
var chart2 = new Chart(document.getElementById('chart2'),
{
type: 'bar',
data:
{
labels: ['a','b','c'],
datasets:
[
{
label: 'A',
data: [1212,1122, 1188, 1617, 1116],
backgroundColor: 'green',
}
]
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.9.1/chart.min.js"></script>
<div style="width:300px;height:200px"><canvas id="chart1"></canvas></div>
<div style="width:300px;height:200px"><canvas id="chart2"></canvas></div>
The first thing you could do is to set beginAtZero to false to Y axis of bar chart because is set to true by default:
https://github.com/chartjs/Chart.js/blob/v3.9.1/src/controllers/controller.bar.js#L636-L650
Then you can set the same scale config to both charts.
options: { // options of charts
scales: {
y: {
beginAtZero: false,
}
}
}
var chart1 = new Chart(document.getElementById('myChart1'),
{
type: 'line',
data:
{
labels: ['a','b','c'],
datasets:
[
{
label: 'A',
data: [1212,1122, 1188, 1617, 1116],
borderColor: 'green',
}
]
},
options: {
scales: {
y: {
beginAtZero: false,
}
}
}
});
var chart2 = new Chart(document.getElementById('myChart2'),
{
type: 'bar',
data:
{
labels: ['a','b','c'],
datasets:
[
{
label: 'A',
data: [1212,1122, 1188, 1617, 1116],
backgroundColor: 'green',
}
]
},
options: {
scales: {
y: {
beginAtZero: false,
}
}
}
});
.myChartDiv {
max-width: 300px;
max-height: 200px;
}
<script src="https://cdn.jsdelivr.net/npm/chart.js#3.9.1/dist/chart.min.js"></script>
<html>
<body>
<div class="myChartDiv">
<canvas id="myChart1" width="300" height="200"/>
</div>
<div class="myChartDiv">
<canvas id="myChart2" width="300" height="200"/>
</div>
</body>
</html>
In Chart.js v2, the datasetIndex property of ChartTooltipItem[] identifies which segment of a stacked bar chart was clicked. This allowed the tooltip content to be customized for each segment of the stacked bar chart.
In v3, TooltipItem[] provides the datasets but does not identify which one was clicked. There is a datasetIndex field for each TooltipItem, but it just matches the index in TooltipItem[] rather than identify the clicked segment.
Has anyone found a field in the V3 tooltip callback to identified which segment of a stacked bar chart was clicked? Or was this functionality lost in the v3 rewrite?
It just works fine, the only thing that is different is that it seems like in v2 it defaulted to the point mode while now it is using index mode, if you change it back to point it works as expected:
var options = {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: 'red'
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
backgroundColor: 'blue'
}
]
},
options: {
plugins: {
tooltip: {
mode: 'point',
callbacks: {
beforeBody: (ttItems, x) => {
ttItems.forEach((ttItem) => {
console.log('BeforeBody: ', ttItem.datasetIndex, ttItem.dataIndex)
})
},
afterBody: (ttItems, x) => {
ttItems.forEach((ttItem) => {
console.log('AfterBody: ', ttItem.datasetIndex, ttItem.dataIndex)
})
}
}
}
},
scales: {
y: {
stacked: true
},
x: {
stacked: 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/3.4.1/chart.js"></script>
</body>
I am trying to personalize a chart.js. But I can not find how to remove (or hide) the X and Y axes.
I am also interested in not showing data on hover and I would like not to show the reference on the top. I am just starting with chart.js and I only need to do a few graphs.
Thank you :)
This is the graph I currently have
datasets: {
label: "I need help plz",
backgroundColor: gradient,
fill: true,
borderColor: "rgb(0, 50, 100)",
borderWidth: 0.001,
tension: 0.4,
radius: 0,
data: dataset,
},
For removing the references on the top this post was useful Chart.js v2 hide dataset labels
As described in the documentation (https://www.chartjs.org/docs/master/axes/#common-options-to-all-axes) you can set in the options of the scale the display to true or false or 'auto' where auto hides the scale if no dataset is visable that is linked to that axis.
For not showing data on hover you can set the tooltip to enabled: false
Example (y auto display and no x axis):
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,
backgroundColor: 'red'
}, ]
},
options: {
plugins: {
tooltip: {
enabled: false
}
},
scales: {
y: {
display: 'auto'
},
x: {
display: false
}
}
}
}
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/3.3.2/chart.js"></script>
</body>
There is a thread with many answers on this topic (Show values on top of bars in chart.js), but it's all about version 2.x
getDatasetMeta() has been deprecated:
https://www.chartjs.org/docs/3.0.2/getting-started/v3-migration.html
The "datalabels" plugin has not been ported to 3.x:
https://github.com/chartjs/chartjs-plugin-datalabels
Have you found any working solutions? How can data values be displayed on top of vertical barcharts (or next to horizontal barcharts)?
You can use the beta of the datalabels plugin.
Documentation: https://v2_0_0-rc_1--chartjs-plugin-datalabels.netlify.app/
Script tag: <script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels#2.0.0-rc/dist/chartjs-plugin-datalabels.min.js"></script>
Install command: npm i chartjs-plugin-datalabels#next
Live example:
<script src="https://cdn.jsdelivr.net/npm/chart.js#3.3.0/dist/chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels#2.0.0-rc"></script>
<canvas id="myChart" width="850" height="520"></canvas>
<script>
var ctx = document.getElementById('myChart');
Chart.register(ChartDataLabels); // first way of registering the plugin, registers them for all your charts
var myChart = new Chart(ctx, {
type: 'bar',
plugins: [ChartDataLabels], // second way of registering plugin, register plugin for only this chart
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
data: [12, 19, 3, 5, 2, 3],
label: 'Advisor Closed MTD',
backgroundColor: 'rgb(192,111,94)',
barThickness: 25,
datalabels: {
color: '#FFCE56'
}
}],
},
options: {
responsive: false,
plugins: {
datalabels: {
anchor: 'end', // remove this line to get label in middle of the bar
align: 'end',
formatter: (val) => (`${val}%`),
labels: {
value: {
color: 'blue'
}
}
}
}
}
});
</script>
Assume that we have the following line chart in Chart.js 2:
https://jsfiddle.net/742zut83/
The code is as follows:
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3]
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero:true
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.1.4/Chart.min.js"></script>
<canvas id="myChart" width="400" height="400"></canvas>
Immediately after the initial animation, I would like the tooltip for a specific point, e.g. the point labeled "Green", to appear, as if one had hovered over the point, and stay there until the end of time. The default behavior of a tooltip appearing, when one hovers over a point, should preferably be disabled for all points, leaving the chart somewhat static after the initial animation is complete and the tooltip of interest has appeared.