点击图例时，条形图会隐藏起来，但数据值不会隐藏在charts.js中

Question

我可以在图例点击时隐藏条形图，但charts.js中的条形图值不隐藏我无法在点击图例时隐藏数据值，只有条形图是隐藏的

我在下面分享了js fiddle代码链接

这是js小提琴https://jsfiddle.net/npyvw1L8/

var ctx = document.getElementById("canvas").getContext("2d");
var nomi = [2017, 2018, 2019];
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: nomi,
datasets: [{
label: 'PP PERVENUTI',
data: [50, 30, 45],
backgroundColor: "#8A0808",
fill: false,
borderColor: "#8A0808",
borderWidth: 3
},
{
label: 'PP EVASI',
data: [60, 45, 12],
backgroundColor: "#0B610B",
fill: false,
borderColor: "#0B610B",
borderWidth: 3
},
{
label: 'PI PERVENUTI',
data: [20, 25, 35],
backgroundColor: "#8A0886",
fill: false,
borderColor: "#8A0886",
borderWidth: 3
},
{
label: 'PI EVASI',
data: [10, 20, 30],
backgroundColor: "#0404B4",
fill: false,
borderColor: "#0404B4",
borderWidth: 3
}
]
},
options: {
legend: {
display: true,
position: "bottom"
},
hover: {
animationDuration: 0
},
animation: {
onComplete: function() {

var ctx = this.chart.ctx;
ctx.font = Chart.helpers.fontString(Chart.defaults.global.defaultFontFamily, 'normal', Chart.defaults.global.defaultFontFamily);
ctx.fillStyle = "black";
ctx.textAlign = 'center';
ctx.textBaseline = 'bottom';
debugger
this.data.datasets.forEach(function(dataset) {

for (var i = 0; i < dataset.data.length; i++) {
for (var key in dataset._meta) {
var model = dataset._meta[key].data[i]._model;
ctx.fillText(dataset.data[i], model.x, model.y - 5);
}
}

});
}
}
}
});

我正在Vue上工作，并且已经实现了这个图表，任何帮助都将受到的感谢

Answer 1

您可以获取该数据集的元信息，并检查其是否隐藏，如果是，请跳过渲染循环：

var ctx = document.getElementById("canvas").getContext("2d");
var nomi = [2017, 2018, 2019];
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: nomi,
datasets: [{
label: 'PP PERVENUTI',
data: [50, 30, 45],
backgroundColor: "#8A0808",
fill: false,
borderColor: "#8A0808",
borderWidth: 3
},
{
label: 'PP EVASI',
data: [60, 45, 12],
backgroundColor: "#0B610B",
fill: false,
borderColor: "#0B610B",
borderWidth: 3
},
{
label: 'PI PERVENUTI',
data: [20, 25, 35],
backgroundColor: "#8A0886",
fill: false,
borderColor: "#8A0886",
borderWidth: 3
},
{
label: 'PI EVASI',
data: [10, 20, 30],
backgroundColor: "#0404B4",
fill: false,
borderColor: "#0404B4",
borderWidth: 3
}
]
},
options: {
legend: {
display: true,
position: "bottom"
},
hover: {
animationDuration: 0
},
animation: {
onComplete: function() {
var ctx = this.chart.ctx;
const chart = this.chart;
ctx.font = Chart.helpers.fontString(Chart.defaults.global.defaultFontFamily, 'normal', Chart.defaults.global.defaultFontFamily);
ctx.fillStyle = "black";
ctx.textAlign = 'center';
ctx.textBaseline = 'bottom';
this.data.datasets.forEach(function(dataset, i) {
if (chart.getDatasetMeta(i).hidden) {
return;
}
for (var i = 0; i < dataset.data.length; i++) {
for (var key in dataset._meta) {
var model = dataset._meta[key].data[i]._model;
ctx.fillText(dataset.data[i], model.x, model.y - 5);
}
}
});
}
}
}
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js"></script>
<canvas id="canvas"></canvas>