I am trying to implement click event on Stacked Bar chart.
The data looks like below:
var chartData = {
type: 'horizontalBar',
data: {
labels: ['A0224', 'A3681', 'A3984', 'A4101', 'A4150', 'B0682', 'Others'],
datasets: [
{
label: "P1",
backgroundColor: '#cc3399',
data: [6, 7, 6, 8, 6, 10, 3]
},
{
label: "P2",
backgroundColor: '#0099ff',
data: [8, 9, 5, 8, 6, 10, 3]
},
{
label: "P3",
backgroundColor: '#0022ff',
data: [6, 7, 6, 8, 6, 10, 3]
}
]
},
options: {
legend: { display: false },
scales: {
yAxes: [{
stacked: true
}],
xAxes: [{
stacked: true
}]
},
}
}
The method for click event and chart creation looks like below:
var myChart = new
Chart(document.getElementById("createCurrYearHccGapChart"),
chartData);
var canvas = document.getElementById('createCurrYearHccGapChart');
canvas.onclick = function (evt) {
var activePoints = myChart.getElementsAtEvent(evt);
var cdata = activePoints[0]['_chart'].config.data;
var idx = activePoints[0]['_index'];
var label = cdata.datasets[idx].label;
var value = cdata.datasets[0].data[idx];
};
And the chart looks like below :
Below are the values i am getting wherever i click on single bar:
Bar 1 - label = P1, value = 6
Bar 2 - label = P2, value = 7
Bar 3 - label = P3, value = 6 and etc...
Problem:
So wherever i click on the 1st bar the label is P1 its because i am getting the index value as 0 for the entire bar and 1 for bar 2 and so on.
Question:
Is there any way to identify the x coordinate value? so that i can identify the click is from which stack.
You could accomplish this using the following on-click event handler for your chart ...
canvas.onclick = function(evt) {
var activePoint = myChart.getElementAtEvent(evt)[0];
var data = activePoint._chart.data;
var datasetIndex = activePoint._datasetIndex;
var label = data.datasets[datasetIndex].label;
var value = data.datasets[datasetIndex].data[activePoint._index];
};
ᴡᴏʀᴋɪɴɢ ᴇxᴀᴍᴘʟᴇ ⧩
var chartData = {
type: 'horizontalBar',
data: {
labels: ['A0224', 'A3681', 'A3984', 'A4101', 'A4150', 'B0682', 'Others'],
datasets: [{
label: "P1",
backgroundColor: '#cc3399',
data: [6, 7, 6, 8, 6, 10, 3]
}, {
label: "P2",
backgroundColor: '#0099ff',
data: [8, 9, 5, 8, 6, 10, 3]
}, {
label: "P3",
backgroundColor: '#0022ff',
data: [6, 7, 6, 8, 6, 10, 3]
}]
},
options: {
responsive: false,
legend: {
display: false
},
scales: {
yAxes: [{
stacked: true
}],
xAxes: [{
stacked: true
}]
},
}
}
var canvas = document.getElementById('createCurrYearHccGapChart');
var myChart = new Chart(canvas, chartData);
canvas.onclick = function(evt) {
var activePoint = myChart.getElementAtEvent(evt)[0];
var data = activePoint._chart.data;
var datasetIndex = activePoint._datasetIndex;
var label = data.datasets[datasetIndex].label;
var value = data.datasets[datasetIndex].data[activePoint._index];
console.log(label, value);
};
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id="createCurrYearHccGapChart" height="170"></canvas>