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VisualizaçõesHow to add on click event to chart js
Hello I have a question concerning js charts. I have already created one in django application and i want to generate a javascript alert by clicking a certain point in the chart.
How can the alert get the value of the point that i choose?
For example with the value 92 like what is shown in the figure below:
·
Juan Pablo Isaza
1 Respostas
Responde à pergunta0
This can be done with an onClick even handler as follows:
onClick: (event, elements, chart) => {
if (elements[0]) {
const i = elements[0].index;
alert(chart.data.labels[i] + ': ' + chart.data.datasets[0].data[i]);
}
}
Please take a look at below runnable code and see how it works.
new Chart('myChart', {
type: 'line',
data: {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: '# of Votes',
data: [65, 59, 80, 81, 56, 55, 40],
borderColor: '#a00'
}]
},
options: {
onClick: (event, elements, chart) => {
if (elements[0]) {
const i = elements[0].index;
alert(chart.data.labels[i] + ': ' + chart.data.datasets[0].data[i]);
}
}
}
});<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.7.1/chart.min.js"></script>
<canvas id="myChart" width="400" height="95"></canvas>
·
Juan Pablo Isaza
Relatório
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