need:
There is a requirement scenario. When using Echarts, you want to customize the click event of legend, but do not want the default click event of legend --- the click will hide and display the corresponding pie chart. As shown below:
After consulting the documentation and manual, I found that there is no method that can be used directly
. Then change the way of thinking, and then select the unselected legend after the default event is triggered.
Ideas:
Rely on the following configurations:
- legendselectchanged
Listen to the event of legend click change, you can implement custom events (but you can't override the default selected and unselected events)
myChart.on('legendselectchanged', function (params) {
// ...
});
- selected
You can set the initial selected item, which will not be used directly here
option = {
tooltip: {
selected: {
// ...
},
// ...
},
//...
}
- setOption
Dynamically change the configuration, it is very clear here, set the unselected legend in legendselectchanged back dynamically
myChart.setOption({
legend:{
selected:{
//...
}
})
- animation
If there is no requirement for animation, turn off the animation, the effect will be better
option = {
animation: false,
//...
}
Full code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>ECharts 实例</title>
<script src="https://cdn.staticfile.org/echarts/4.3.0/echarts.min.js"></script>
</head>
<body>
<div id="main" style="width: 600px;height:400px;"></div>
<script type="text/javascript">
var myChart = echarts.init(document.getElementById('main'));
option = {
animation: false, // 取消动画
tooltip: {
trigger: 'item',
formatter: '{a} <br/>{b}: {c} ({d}%)'
},
legend: {
orient: 'vertical',
left: 10,
data: ['直接访问', '邮件营销', '联盟广告', '视频广告', '搜索引擎']
},
series: [
{
name: '访问来源',
type: 'pie',
radius: ['50%', '70%'],
avoidLabelOverlap: false,
label: {
show: false,
position: 'center'
},
emphasis: {
label: {
show: true,
fontSize: '30',
fontWeight: 'bold'
}
},
labelLine: {
show: false
},
data: [
{
value: 335, name: '直接访问'},
{
value: 310, name: '邮件营销'},
{
value: 234, name: '联盟广告'},
{
value: 135, name: '视频广告'},
{
value: 1548, name: '搜索引擎'}
]
}
]
};
myChart.setOption(option);
// 关键代码
myChart.on('legendselectchanged', function (params) {
myChart.setOption({
legend:{
selected:{
[params.name]: true}}
})
console.log('点击了', params.name);
// do something
});
</script>
</body>
</html>