下面的代码使用隐藏的数据label: "Target"
生成上面的图表:
var data = [{
labels: ["India", "US", "China", "Canada"],
data: [55, 60, 75, 50],
label: "Target",
hidden: true
}, {
labels: ["India", "US", "China", "Canada"],
data: [30, 32, 38, 45],
backgroundColor: [
"#4b77a9",
"#5f255f",
"#d21243",
"#B27200"
],
borderColor: "#fff",
label: "Achieved"
}, {
labels: ["Arrivals", "Departure"],
data: [8, 13],
backgroundColor: [
"#92d400",
"#bbb"
],
borderColor: "#fff"
}];
我正在用以下代码显示工具提示:
tooltips: {
callbacks: {
label: function (tooltipItem, data) {
var label = data.datasets[tooltipItem.datasetIndex].labels[tooltipItem.index];
var values = data.datasets[tooltipItem.datasetIndex].data;
var value = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
var total = 0;
for (var i in values) {
total += values[i];
}
var percentage = Math.round((value / total) * 100);
var totally = total.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
if (tooltipItem.datasetIndex !== data.datasets.length - 1) {
return [label + " : " + value.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",") + ' (' + percentage + '%)', "Total : " + totally];
} else {
return [label + " : " + value.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",") + ' (' + percentage + '%)', "Total : " + totally];
}
}
}
}
使用上面的工具提示代码,我可以显示每个值占总饼图总数的百分比。 但是,我想实现两件事:
1)在第一环中,显示目标label: "Target",hidden: true
对已实现label: "Achieved"
的百分比。工具提示中的百分比值为[印度:54.54%,美国:53.33%,中国:50.66%,加拿大:90%]
2)在第二个环中,也不要显示任何百分比和总计。
这是JSFiddle(https://jsfiddle.net/kingBethal/9hj024wy/7/)