在堆叠的条形图上单击事件- ChartJs。

I am trying to implement click event on Stacked Bar chart.

我正在尝试在堆栈条形图上实现单击事件。

The data looks like below:

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
            }]
        },

    }
}

The method for click event and chart creation looks like below:

单击事件和图表创建的方法如下:

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];
};

And the chart looks like below :

图表如下:

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...

下面是我在点击单杠时得到的值:bar 1 - label = P1, value = 6 bar 2 - label = P2, value = 7 bar 3 - label = P3, value = 6等等…

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:当我点击第一栏时标签是P1，因为我得到了整个栏的索引值为0，第二栏为1，以此类推。

Question:
Is there any way to identify the x coordinate value? so that i can identify the click is from which stack.

问:有什么方法可以识别x坐标值吗?所以我能识别出点击是从哪个堆栈。

1 个解决方案

#1

You could accomplish this using the following on-click event handler for your chart ...

您可以使用以下单击事件处理程序来完成此任务。

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 ⧩

ᴡᴏʀᴋɪɴɢᴇxᴀᴍᴘʟᴇ⧩

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>

#1