Related
In ChartJS's pie and doughnut charts there is a legend option for every data that you can click to hide the data, this behavior changes with bar and line charts, when there is only a single legend option for the entire dataset, and when clicking it, it hides the entire dataset.
Is there any way to have a legend option for each data in bar/line charts?
Here's a example with a bar and a pie chart using the exact same configuration, you can see in the pie chart you can hide the slices individually, while in the bar chart you can only hide the entire dataset
var barCfg = {
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
}]
}
};
var pieCfg = {
type: 'pie',
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
}]
}
};
var barChart = new Chart(
document.getElementById('barChart').getContext('2d'), barCfg);
var pieChart = new Chart(
document.getElementById('pieChart').getContext('2d'), pieCfg);
JSFiddle
Looking at the ChartJS API it looks like hide(datasetIndex, dataIndex?) would be what you are looking for.
Hide is called when you click a legend (without dataIndex) to hide the dataset. When you call it with a dataIndex it behaves a little bit differently. Here is a fiddle to show what i mean: JSFiddle
chart onClick:
function chartOnClick(evt) {
let chart = evt.chart
const points = chart.getElementsAtEventForMode(evt, 'nearest', {}, true);
if (points.length) {
const firstPoint = points[0];
//var label = myChart.data.labels[firstPoint.index];
//var value = myChart.data.datasets[firstPoint.datasetIndex].data[firstPoint.index];
let datasetIndex = firstPoint.datasetIndex, index = firstPoint.index;
if (firstPoint.element.hidden != true) {
chart.hide(datasetIndex, index);
} else {
chart.show(datasetIndex, index);
}
}
}
options: { // chart options
onClick: chartOnClick
}
If that works for you, then great, but if you want it to disappear completely, then you would need to delete the data from the array like this:
chart.data.datasets[datasetIndex].data.splice(index, 1);
chart.update();
Just keep a copy of the original array with all the data. You would likely have a "restore" button somewhere, that would set the data back when you click it:
chart.data = myData;
chart.update();
Here is a fiddle with the latter behaviour: JSFiddle (lacking the restore button, but it should be very easy to add)
ChartJS's BarCharts expect your data to belong to a single category thats why you only one button to show/hide all bars.
You easily fix this by changing the structure of your data so that each value has its own label. Instead of,
datasets: [{
label: 'A',
data: [1, 2, 3]
}]
your data should look like,
datasets: [{
label: 'A',
data: [1]
},{
label: 'B',
data: [2]
},{
label: 'C',
data: [3]
}]
var barCfg = {
type: 'bar',
data: {
labels: ['Red'],
datasets: [{
label: 'Person 1',
data: [12],
backgroundColor: ['#FFC857']
}, {
label: 'Person 2',
data: [19],
backgroundColor: ['#E9724C']
},{
label: 'Person 3',
data: [3],
backgroundColor: ['#C5283D']
},{
label: 'Person 4',
data: [5],
backgroundColor: ['#481D24']
},{
label: 'Person 5',
data: [2],
backgroundColor: ['#ff1Dff']
},{
label: 'Person 6',
data: [3],
backgroundColor: ['#48ffff']
}]
}
};
var pieCfg = {
type: 'pie',
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
}]
}
};
var barChart = new Chart(
document.getElementById('barChart').getContext('2d'), barCfg);
var pieChart = new Chart(
document.getElementById('pieChart').getContext('2d'), pieCfg);
<script src="https://cdn.jsdelivr.net/npm/chart.js#3.4.1/dist/chart.min.js"></script>
<canvas id="barChart"></canvas>
<canvas id="pieChart"></canvas>
JSFiddle fork just for the record: https://jsfiddle.net/pqva7yso/
I am trying to use Chart.js in my HTML document(main.html) by calling the the javascript function form a separate javascript file (home.js).
The HTML looks as follows:
{% block head %}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<script type="text/javascript" src="/static/js/home.js"></script>
{% endblock %}
{% block body %}
<div>
<canvas id='myChart'></canvas>
</div>
<script>
Chart(data, document.getElementById('myChart'))
</script>
The js file looks as follows:
function Chart(data, ctx){
console.log("JS")
var 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: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
}
When I do that it somehow keeps executing the the function (ie. stuck in a loop, I checked that by using console.log('JS'). I did not figure out why it keeps doing that. The chart is never displayed.
If I add the function directly in the html in a tag it works flawlessly, but I'd rather want the js separate from the html.
I use flask as web framework and that is where the variable 'data' is coming from. Any tips or ideas?
Thanks and regards
PS: I don't use 'data' at the moment because I don't even get the chart running (it will be the result of db query later.
First, two problems unrelated to your infinite loop problem:
In main.html, the data param you are sending to Chart.js is undefined. Presumably you will fix that in your actual code.
In the selector you send to Chart.js, you are sending the canvas – document.getElementById('myChart') – when you should be sending the canvas context – document.getElementById('myChart').getContext('2d')
Once those are fixed, you could potentially be rendering a chart, but you get an infinite loop because you have called your own function Chart when that's also the name of the Chart.js function (where it says var myChart = new Chart(ctx, ...). Just change your function name to something else.
Here's an example where I just put in an empty array for data and changed your function name to drawChart.
function drawChart(data, ctx){
var 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: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
}
drawChart([], document.getElementById('myChart').getContext('2d'))
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id='myChart'></canvas>
NB: The script error that shows up in the console log is because of cross-origin scripting on StackOverflow and is something you can fix on your own site.
I have an object that has a 10 keys (names of US states) and a value attached. I want to know how to make the key the label and the value the data in Chart.js but I can't seem to find anything on this.
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: KEYS IN OBJECT GOES HERE,
datasets: [{
label: '# of Votes',
data: VALUE OF KEYS GO HERE,
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: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
below is my object
var stateGraphOne = {
"Oklahoma": 229,
"Oregon": 107,
"Pennsylvania": 165,
"South Carolina": 15,
"South Dakota": 96,
"Tennessee": 460,
"Texas": 2682,
"Utah": 372,
"Vermont": 13,
"Virginia": 33
};
I'm going to have multiple graphs and I have multiple objects to do the same thing with. If this would be easier using d3.js I am open to using that too. Thanks in advance.
You can get the object keys and values like so:
labels: Object.keys(stateGraphOne),
datasets: [{
label: '# of Votes',
data: Object.values(stateGraphOne),
...
A quick search and... another answer
I am want to use data and level dynamic by ajax, so i am using as below but not working.
My ajax return data in json_encode of php.
My code is:
success: function (result) {
result = JSON.parse(result);
var labels = result['labels'];
var data = result['data'];
//console.log(data);
var ctx = document.getElementById("chartbtc");
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: [labels],
datasets: [{
label: 'Market Price (USD)',
data: [data],
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: {
responsive: true,
maintainAspectRatio: false,
scales: {
yAxes: [{
ticks: {
beginAtZero: false
}
}]
}
}
});
}
But chart is not generating:
Ajax result is:
{"labels":"13-Nov-2017, 14-Nov-2017, 15-Nov-2017, 16-Nov-2017, 17-Nov-2017, 18-Nov-2017, 19-Nov-2017, 20-Nov-2017, 21-Nov-2017, 22-Nov-2017, 23-Nov-2017, 24-Nov-2017, 25-Nov-2017, 26-Nov-2017, 27-Nov-2017, 28-Nov-2017, 29-Nov-2017, 30-Nov-2017, 01-Dec-2017, 02-Dec-2017, 03-Dec-2017, 04-Dec-2017, 05-Dec-2017, 06-Dec-2017, 07-Dec-2017, 08-Dec-2017, 09-Dec-2017, 10-Dec-2017, 11-Dec-2017, 12-Dec-2017","data":"6550.22, 6635.41, 7301.42, 7815.03, 7786.88, 7817.14, 8007.65, 8255.59, 8059.8, 8268.03, 8148.94, 8250.97, 8707.4, 9284.14, 9718.29, 9952.5, 9879.32, 10147.37, 10883.91, 11071.36, 11332.62, 11584.82, 11878.43, 13540.98, 16501.97, 16007.43, 15142.83, 14869.8, 16762.11, 17276.39"}
Since you have provided your ajax result, this will not work with the chart generation. In your case result["labels"] is a string and you are just making a list with 1 element which is the whole string(which is not valid for the labels property and will not work). What you should do is split the string, format it correctly and then supply it as a list to the labels property. Easiest way would be to use the split() function, and in your case you could split by ", ". Although I would recommend to implement a better response if its possible (have it something like so: {"labels": ["13-Nov-2017", "14-Nov-2017", ...]}).
Hope this helps!
For the first time you can fill the chart with your own value, but when it is coming for dynamically appending data then you should remove the canvas element and regenerate it. So that your data will get appended dynamically on chart.
You can try something like this.
<canvas id="chartbtc" class="canvasChart"></canvas>
<script>
dynamicDataAppendOnChart(labels, data); // On page loading you will be having your own data so you can pass them, or if you want that to be happen with ajax when page loading itself you can trigger the click event.
$('#btnClick').trigger('click');
// You will be calling the function with click event...
$('#btnClick').on('click', function () {
var data = '', labels = '';
$.ajax({
url: url,
type: "POST",
data: data,
async: isAsync,
success: function (result) {
result = JSON.parse(result);
labels = result['labels'];
data = result['data'];
}
});
dynamicDataAppendOnChart(labels, data); // Now you can call the function by passing labels and data
});
function dynamicDataAppendOnChart() {
$('#chartbtc').remove();
$('#appendTheCanvasElement').append('<canvas id="chartbtc" class="canvasChart"><canvas>'); // This would create new canvas element every time and removes the older one.
var ctx = document.getElementById("chartbtc");
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: [labels],
datasets: [{
label: 'Market Price (USD)',
data: [data],
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: {
responsive: true,
maintainAspectRatio: false,
scales: {
yAxes: [{
ticks: {
beginAtZero: false
}
}]
}
}
});
}
</script>
Try This.
Declare label and data as
var labels = result['labels'].split(","); // Return Array of Strings Of labels
var data = JSON.parse("[" + result['data'] + "]");// return array of data
Chage
labels: [labels],
data: [data],
to
labels: labels,
data: data,
Because it already in array
This is my first time working with Chart Js and I managed to get it displaying on my page but the keys 'label', 'backgroundColor', 'borderColor', and 'borderWidth' won't display. The keys 'labels' and 'data' work just fine as I can see the labels and the bars in the chart. I tried assigning the non-displaying keys to variables just like 'labels' and 'data' to see if it would work that way but no luck. I also tried passing hex colors and regular color names like red, blue, etc. but that didn't work either. If anyone could provide some assistance it would be greatly appreciated, thanks!
'use strict';
import React, { Component } from 'react';
var Chart = require("react-chartjs").Bar;
class BarChart extends Component {
capitalize(name) {
return name.charAt(0).toUpperCase() + name.slice(1);
}
render() {
var pokeLabels = this.props.stats.map((label) => {
return this.capitalize(label.stat.name)
})
var pokeDataSet = this.props.stats.map((set) => {
return set.base_stat
})
console.log(this.props.stats);
var data = {
labels: pokeLabels,
datasets: [
{
label: 'Pokemon Stats',
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,
data: pokeDataSet
}
]
}
return (
<div className='row'>
<div className='col-xs-12 col-sm-offset-3 col-xs-offset-0'>
<Chart data={data} width="600" height="250" redraw />
</div>
</div>
);
}
}
export default BarChart;
So I was able to get the colors working by doing this:
datasets: [
{
label: "My First dataset",
fillColor: ["rgba(0,10,220,0.5)","rgba(220,0,10,0.5)","rgba(220,0,0,0.5)","rgba(120,250,120,0.5)" ],
strokeColor: "rgba(220,220,220,0.8)",
highlightFill: "rgba(220,220,220,0.75)",
highlightStroke: "rgba(220,220,220,1)",
data: pokeDataSet
}
Hope this can help someone who has a similar issue!
The background color will change the color of the bars.
So, you can give different colors to different bar.
datasets: [
{
label: 'My First dataset',
backgroundColor: ['rgba(0,10,220,0.5)', 'rgba(220,0,10,0.5)'],
borderColor: 'rgba(0,0,0,1)',
data: pokeDataSet,
},
],