Chart.js v2.0：仅针对一个数据集的工具提示(Chart.js v2.0: Tooltip only for one dataset)

我有这3个数据集的图表：

this.myChart = new Chart(this.ctx, {
  type: 'bar',
  data: {
    labels: labels,
    datasets: [
      { type: 'line', data: data3 },
      { type: 'bar', data: data1, backgroundColor: "#3EAFD5" },
      { type: 'bar', data: data2, backgroundColor: "#D24B47" }
    ]
  }
}
 
 如何仅为第一个数据集显示工具提示（类型：'line'）？ 
I have graph whit this 3 datasets:
 
this.myChart = new Chart(this.ctx, {
  type: 'bar',
  data: {
    labels: labels,
    datasets: [
      { type: 'line', data: data3 },
      { type: 'bar', data: data1, backgroundColor: "#3EAFD5" },
      { type: 'bar', data: data2, backgroundColor: "#D24B47" }
    ]
  }
}
 
How can I do to show tooltip only for first dataset (type: 'line')?
                
最满意答案
                
                    
                        
 您可以覆盖图表对象的getElementAtEvent方法 
 
var originalGetElementAtEvent = myChart.getElementAtEvent;
myChart.getElementAtEvent = function () {
    return originalGetElementAtEvent.apply(this, arguments).filter(function (e) {
        return e._datasetIndex == 0;
    });
}
 
 其中myChart是您的图表对象。 
 
 
 小提琴 - http://jsfiddle.net/x4shhvbk/ 
You can just override the getElementAtEvent method of the chart object
 
var originalGetElementAtEvent = myChart.getElementAtEvent;
myChart.getElementAtEvent = function () {
    return originalGetElementAtEvent.apply(this, arguments).filter(function (e) {
        return e._datasetIndex == 0;
    });
}
 
where myChart is your chart object.
 
 
Fiddle - http://jsfiddle.net/x4shhvbk/