在chartjsv3中光标指针改变悬停不起作用

Question

当我们在使用chartjs(v3)库创建的条形图上悬停时，我试图将光标更改为指针。但是我不能用下面的代码做到这一点:

<script src="https://cdn.jsdelivr.net/npm/chart.js@3.0.0/dist/chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels@2.0.0"></script>
<div style="width:600px">
<canvas id="myChart"></canvas>
</div>
<script>
var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
plugins: [ChartDataLabels],
options: {
scales: {
y: {
beginAtZero: true
}
},
hover: {
onHover: function(e) {
//$("#canvas1").css("cursor", e[0] ? "pointer" : "default");
var el = document.getElementById("myChart");
el.style.cursor = e[0] ? "pointer" : "default";
}
},
legend: {
display: false,
onHover: function (e) {
e.target.style.cursor = 'pointer'
},
onLeave: function (e) {
e.target.style.cursor = 'default'
}
},
}
});
</script>

如何解决这个问题?

Answer 1

几件事不对，onHover不属于hover子选项部分，甚至不认为有一个悬停子选项部分。此外，事件不是一个数组，而是一个对象，您希望第二个参数包含所有活动元素。

还需要在plugins部分配置图例。禁用图例并使用onHover和onLeave回调也没有意义

<script src="https://cdn.jsdelivr.net/npm/chart.js@3.0.0/dist/chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels@2.0.0"></script>
<div style="width:600px">
<canvas id="myChart"></canvas>
</div>
<script>
var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
plugins: [ChartDataLabels],
options: {
scales: {
y: {
beginAtZero: true
}
},
onHover: function(e, activeEls) {
//$("#canvas1").css("cursor", e[0] ? "pointer" : "default");
var el = document.getElementById("myChart");
el.style.cursor = activeEls[0] ? "pointer" : "default";
},
plugins: {legend: {
display: false,
onHover: function(e) {
e.target.style.cursor = 'pointer'
},
onLeave: function(e) {
e.target.style.cursor = 'default'
}
},}
}
});
</script>