There are multiple charts on one page. Each chart line is mon. I want to display a legend that is mon to multiple charts like the figure.It shows and hides all chart lines with OnClick like the default legend. THIS PICT IS FAKE
Is that possible? how?
I had tried Chart.js sync legend toggle on multiple charts, One legend, multiple charts Chart JS and etc. But, those solutions have one chart with legend, and that legend affects other charts.
Should I hide the chart and show only the legend? Should I draw a chart with no data?
I would be grad if you could tell me
HTML
<script src=".js/v1.0.2/Chart.min.js"></script>
<script src=".js/2.0.0-beta/Chart.js"></script>
<div>
<canvas id="myChartA"></canvas>
</div>
<div>
<canvas id="myChartB"></canvas>
</div>
JS
var ctxA = document.getElementById("myChartA").getContext("2d");
var ctxB = document.getElementById("myChartB").getContext("2d");
let data_A1 = [{
x: "2019-01-01 00:01:38",
y: "13.0"
},
{
x: "2019-01-01 01:01:39",
y: "11.0"
},
{
x: "2019-01-01 02:01:40",
y: "16.0"
},
{
x: "2019-01-01 03:01:41",
y: "15.0"
},
{
x: "2019-01-01 04:01:42",
y: "14.0"
}
];
var data_A2 = [{
x: "2019-01-01 00:01:42",
y: 14.671
}, {
x: "2019-01-01 01:01:42",
y: 13.691
}, {
x: "2019-01-01 02:01:42",
y: 16.691
}, {
x: "2019-01-01 03:01:42",
y: 17.691
}, {
x: "2019-01-01 04:01:42",
y: 18.691
}];
let data_B1 = [{
x: "2019-01-02 00:01:38",
y: "12.0"
},
{
x: "2019-01-02 01:01:39",
y: "11.0"
},
{
x: "2019-01-02 02:01:40",
y: "13.0"
},
{
x: "2019-01-02 03:01:41",
y: "14.0"
},
{
x: "2019-01-02 04:01:42",
y: "16.0"
}
];
var data_B2 = [{
x: "2019-01-02 00:00:00",
y: 14.671
}, {
x: "2019-01-02 01:01:42",
y: 13.691
}, {
x: "2019-01-02 02:01:42",
y: 16.691
}, {
x: "2019-01-02 03:01:42",
y: 15.691
}, {
x: "2019-01-02 04:01:42",
y: 14.691
}];
var myChartA = new Chart(ctxA, {
type: 'line',
data: {
datasets: [{
label: '1st Data',
data: data_A1,
borderColor: '#0f0',
showLine: true
}, {
label: '2nd Data',
data: data_A2,
borderColor: '#f00',
showLine: true
}]
},
options: {
scales: {
xAxes: [{
type: 'time',
time: {
displayFormat: 'h:mm',
}
}]
}
}
});
var myChartB = new Chart(ctxB, {
type: 'line',
data: {
datasets: [{
label: '1st Data',
data: data_B1,
borderColor: '#0f0',
showLine: true
}, {
label: '2nd Data',
data: data_B2,
borderColor: '#f00',
showLine: true
}]
},
options: {
scales: {
xAxes: [{
type: 'time',
time: {
displayFormat: 'h:mm',
}
}]
}
}
});
There are multiple charts on one page. Each chart line is mon. I want to display a legend that is mon to multiple charts like the figure.It shows and hides all chart lines with OnClick like the default legend. THIS PICT IS FAKE
Is that possible? how?
I had tried Chart.js sync legend toggle on multiple charts, One legend, multiple charts Chart JS and etc. But, those solutions have one chart with legend, and that legend affects other charts.
Should I hide the chart and show only the legend? Should I draw a chart with no data?
I would be grad if you could tell me
HTML
<script src="https://rawgit./nnnick/Chart.js/v1.0.2/Chart.min.js"></script>
<script src="https://cdnjs.cloudflare./ajax/libs/Chart.js/2.0.0-beta/Chart.js"></script>
<div>
<canvas id="myChartA"></canvas>
</div>
<div>
<canvas id="myChartB"></canvas>
</div>
JS
var ctxA = document.getElementById("myChartA").getContext("2d");
var ctxB = document.getElementById("myChartB").getContext("2d");
let data_A1 = [{
x: "2019-01-01 00:01:38",
y: "13.0"
},
{
x: "2019-01-01 01:01:39",
y: "11.0"
},
{
x: "2019-01-01 02:01:40",
y: "16.0"
},
{
x: "2019-01-01 03:01:41",
y: "15.0"
},
{
x: "2019-01-01 04:01:42",
y: "14.0"
}
];
var data_A2 = [{
x: "2019-01-01 00:01:42",
y: 14.671
}, {
x: "2019-01-01 01:01:42",
y: 13.691
}, {
x: "2019-01-01 02:01:42",
y: 16.691
}, {
x: "2019-01-01 03:01:42",
y: 17.691
}, {
x: "2019-01-01 04:01:42",
y: 18.691
}];
let data_B1 = [{
x: "2019-01-02 00:01:38",
y: "12.0"
},
{
x: "2019-01-02 01:01:39",
y: "11.0"
},
{
x: "2019-01-02 02:01:40",
y: "13.0"
},
{
x: "2019-01-02 03:01:41",
y: "14.0"
},
{
x: "2019-01-02 04:01:42",
y: "16.0"
}
];
var data_B2 = [{
x: "2019-01-02 00:00:00",
y: 14.671
}, {
x: "2019-01-02 01:01:42",
y: 13.691
}, {
x: "2019-01-02 02:01:42",
y: 16.691
}, {
x: "2019-01-02 03:01:42",
y: 15.691
}, {
x: "2019-01-02 04:01:42",
y: 14.691
}];
var myChartA = new Chart(ctxA, {
type: 'line',
data: {
datasets: [{
label: '1st Data',
data: data_A1,
borderColor: '#0f0',
showLine: true
}, {
label: '2nd Data',
data: data_A2,
borderColor: '#f00',
showLine: true
}]
},
options: {
scales: {
xAxes: [{
type: 'time',
time: {
displayFormat: 'h:mm',
}
}]
}
}
});
var myChartB = new Chart(ctxB, {
type: 'line',
data: {
datasets: [{
label: '1st Data',
data: data_B1,
borderColor: '#0f0',
showLine: true
}, {
label: '2nd Data',
data: data_B2,
borderColor: '#f00',
showLine: true
}]
},
options: {
scales: {
xAxes: [{
type: 'time',
time: {
displayFormat: 'h:mm',
}
}]
}
}
});
- Is there any reason why you are using the beta version? – karthick Commented Aug 16, 2019 at 19:03
2 Answers
Reset to default 7You can create a mon legend and through generateLegend api, if both the datasets are similar.
First disable the default legends though the options
legend: {
display: false
}
Then use generateLegend() api to get the data labels and set it to a mon element.
<ul class="legend">
</ul>
Then add event listeners to the generated elements and target all the charts
document.querySelector('.legend').innerHTML = myChartA.generateLegend();
var legendItems = document.querySelector('.legend').getElementsByTagName('li');
for (var i = 0; i < legendItems.length; i++) {
legendItems[i].addEventListener("click", legendClickCallback.bind(this,i), false);
}
function legendClickCallback(legendItemIndex){
document.querySelectorAll('.myChart').forEach((chartItem,index)=>{
var chart = Chart.instances[index];
var dataItem = chart.data.datasets[legendItemIndex]
if(dataItem.hidden == true || dataItem.hidden == null){
dataItem.hidden = false;
} else {
dataItem.hidden = true;
}
chart.update();
})
}
A sample pen is present here https://codepen.io/srajagop/pen/yLBJOOo
Note I am using chartjs 2.8
If anyone using React version of Chartjs particularly react-chartjs-2, I have done it using React Hooks with react-chartjs-2, see the sandbox demo