堆积条形图上的Click事件-ChartJs [英] Click event on stacked bar chart - ChartJs
问题描述
我正在尝试在堆积条形图上实现点击事件.
I am trying to implement click event on Stacked Bar chart.
数据如下:
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
}]
},
}
}
用于创建点击事件和图表的方法如下:
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];
};
图表如下:
以下是我在单击单个条时所获得的值:
条1-标签= P1,值= 6
条2-标签= P2,值= 7
条3-标签= P3,值= 6等...
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...
问题:
因此,无论我在第一个条上单击什么位置,标签都为P1,因为我将整个条的索引值设置为0,将第二条的索引值设置为1,依此类推.
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.
问题:
有什么方法可以识别x坐标值?这样我就可以确定点击来自哪个堆栈.
Question:
Is there any way to identify the x coordinate value? so that i can identify the click is from which stack.
推荐答案
您可以使用以下针对图表的点击事件处理程序来完成此操作...
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];
};
ᴡᴏʀᴋɪɴɢᴇxᴀᴍᴘʟᴇstrong
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>
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