Echarts图例点击事件自定义Echarts图例legend点击事件(已解决)
Posted 拄杖盲学轻声码
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目录
**【写在前面】**这下我又不得不说了,还是客户现场使用时想查询一周的数据,查询时候发现页面居然要等20多秒,这是个人都得崩溃吧,然后就开始排查这块业务代码模块,主要体现在两个方面:
A.接口请求时间过长(约8秒),有优化的空间
B.前端一次性调用了四次接口,分别查询了四组数据(需要优化)
正因为有上述B的需求,所以特意针对点击echarts图例点击触发接口调用。
涉及知识点:legendselectchanged、Echarts的legend属性、Echarts图例、legend点击事件、echarts多线共存。
先睹为快(效果)
【版权声明】因个人创作经常被爬取到其他网站,特此声明,本人暂时只在CSDN平台创作,博主名为:《拄杖盲学轻声码》
1、实现Echarts多条曲线
先实现一个最简单的echarts,多条线一起的曲线图,如下图所示四条线同属一个维度。
具体实现代码如下:
var resultData1 =
status: 200,
data:
data_current: [
"value": 143,
"record_time": "2022-03-04 12:00:00"
,
"value": 153,
"record_time": "2022-03-04 13:00:00"
,
"value": 133,
"record_time": "2022-03-04 18:00:00"
],
data_pevone: [
"value": 123,
"record_time": "2022-03-04 12:00:00"
,
"value": 103,
"record_time": "2022-03-04 13:00:00"
,
"value": 113,
"record_time": "2022-03-04 18:00:00"
],
data_pevthree: [
"value": 123,
"record_time": "2022-03-04 12:00:00"
,
"value": 123,
"record_time": "2022-03-04 13:00:00"
,
"value": 223,
"record_time": "2022-03-04 14:00:00"
,
"value": 113,
"record_time": "2022-03-04 15:00:00"
,
"value": 113,
"record_time": "2022-03-04 18:00:00"
],
data_pevweek: [
"value": 43,
"record_time": "2022-03-04 11:00:00"
,
"value": 63,
"record_time": "2022-03-04 13:00:00"
,
"value": 66,
"record_time": "2022-03-04 14:00:00"
,
"value": 59,
"record_time": "2022-03-04 15:00:00"
,
"value": 43,
"record_time": "2022-03-04 18:00:00"
],
data_pevself: []
,
message: ""
;
var lineChartBaseInfo =
data_current:
modulename: '当前值',
color: '136, 0, 21',
rangDay: 0,
,
data_pevone:
modulename: '上个工作日',
color: '233, 128, 45',
rangDay: 1,
,
data_pevthree:
modulename: '前三个工作日',
color: '54, 93, 251',
rangDay: 3,
,
data_pevweek:
modulename: '前一周',
color: '191, 24, 109',
rangDay: 7,
,
data_pevself:
modulename: '自选时间',
color: '161, 24, 169',
rangDay: 0,
,
var lineCharts = echarts.init(document.getElementById('lineCharts'));
var _iconPath = "path://M234.666667 490.666667h-153.6a25.6 25.6 0 1 0 0 51.2h153.6a25.6 25.6 0 1 0 0-51.2zM473.6 490.666667h-153.6a25.6 25.6 0 1 0 0 51.2h153.6a25.6 25.6 0 1 0 0-51.2zM934.4 490.666667h-136.533333a25.6 25.6 0 1 0 0 51.2h136.533333a25.6 25.6 0 1 0 0-51.2zM712.533333 490.666667h-153.6a25.6 25.6 0 1 0 0 51.2h153.6a25.6 25.6 0 1 0 0-51.2z";
// var _iconPath = "path://M512 139.81262864a286.42534744 286.42534744 0 1 0 286.42534744 286.42534744 286.42534744 286.42534744 0 0 0-286.42534744-286.42534744z m0 477.3755789a190.95023144 190.95023144 0 1 1 190.95023144-190.95023146 190.95023144 190.95023144 0 0 1-190.95023144 190.95023146z";
var _icon = 'roundRect';
var legendData = [], seriesData = []; //定义变量
var newDataList =
data_current: resultData1.data.data_current,
data_pevone: resultData1.data.data_pevone,
data_pevthree: resultData1.data.data_pevthree,
data_pevweek: resultData1.data.data_pevweek,
data_pevself: resultData1.data.data_pevself,
;
//赋值操作
$.each(newDataList, function (indexInArray, valueOfElement)
legendData.push(
name: lineChartBaseInfo[indexInArray]['modulename'],
icon: _iconPath
);
if (valueOfElement != null)
var _data = $.map(valueOfElement, function (val, idx)
return
name: new Date(val.record_time).toString(),
value: [val.record_time, val.value]
);
seriesData.push(
name: lineChartBaseInfo[indexInArray]['modulename'],
data: _data,
type: "line",
smooth: true,
// smoothMonotone: "x",
cursor: "pointer",
// showSymbol: false,
itemStyle: normal: label: show: true ,
showSymbol: true,
lineStyle:
shadowColor: "rgba(18,61,172,0.5)",
shadowBlur: 10
)
);
var option =
color: ['#80FFA5', '#00DDFF', '#37A2FF', '#FF0087', '#FFBF00'],
backgroundColor: '#fff',
title:
text: '健康总分(100001)_指标历史曲线',
textStyle:
color: '#666',
fontSize: 16,
,
top: '10px',
left: '10px',
,
legend:
data: legendData,
top: '10px',
right: '20px',
itemWidth: 10,
itemHeight: 10,
itemGap: 10,
textStyle:
color: "#898989",
lineHeight: 15
,
selected: //在这里设置默认展示就ok了
'当前值': true,
'上个工作日': false,
'前三个工作日': false,
'前一周': false,
'自选时间': false
,
type: "scroll",
,
dataZoom: [
type: 'inside',
show: true,
xAxisIndex: [0],
],
tooltip:
backgroundColor: "#fff",
trigger: "axis",
axisPointer:
type: "line"
,
textStyle:
color: "#565656",
lineHeight: 28
,
confine: true,
padding: 12,
formatter: function (params)
,
grid:
left: 20,
right: 60,
top: 60,
bottom: 20,
containLabel: true
,
xAxis:
name: "时间",
type: "time",
boundaryGap: true,
axisLabel:
color: "#a0a9bc",
,
splitLine:
lineStyle:
type: "dashed"
,
axisLine:
show: false
,
axisTick:
show: false
,
,
yAxis:
name: "值",
nameTextStyle:
color: "gray"
,
type: "value",
axisLabel:
color: "#a0a9bc",
inside: true,
margin: 0,
verticalAlign: "bottom"
,
splitLine:
lineStyle:
type: "dashed"
,
axisLine:
show: false
,
axisTick:
show: false
,
series: seriesData
;
lineCharts.clear();
lineCharts.setOption(option);
这个是在所有数据返回速度很快的情况下可以直接拿到的,但是如果数据量过于庞大,那么对页面来说直接拿4条数据的过程无疑是个漫长的等待。
2、点击echarts触发接口请求
2.1 先默认隐藏部分数据
设置legend的selected属性,将当天的设置为true,其他的设置为false即可,设置完后如下所示:
selected:
//在这里设置默认展示就ok了
'当前值': true,
'上个工作日': false,
'前三个工作日': false,
'前一周': false,
'自选时间': false
,
2.2 自定义legend图例点击事件
首先说一下这边用到的图例点击事件为legendselectchanged,但是在触发前记得加上off,主要目的就是为了防止二次触发,和click事件一样。如下所示应用:
lineCharts.off(‘legendselectchanged’).on(‘legendselectchanged’, function (params)
//触发后执行的内容
);
也就是在这个执行内容里面我们可以调用接口,从而实现echarts点击图例触发接口调用的目的。
具体实现效果如下:
具体实现代码如下:
lineCharts.off('legendselectchanged').on('legendselectchanged', function (params)
//调用接口调整源数据
debugger;
var _pevType = 0;
if (params.selected[params.name])
//表示true
if (params.name.indexOf("上个工作") > -1)
layer.msg("长得帅的黄大大点击了:" + params.name);
//此处可以调用接口查询数据
else if (params.name.indexOf("当前") > -1)
layer.msg("长得帅的黄大大点击了:" + params.name);
//此处可以调用接口查询数据
else if (params.name.indexOf("周") > -1)
layer.msg("长得帅的黄大大点击了:" + params.name);
//此处可以调用接口查询数据
else if (params.name.indexOf("三") > -1)
layer.msg("长得帅的黄大大点击了:" + params.name);
//此处可以调用接口查询数据
else
//表示false,隐藏
console.log('点击了', params.name);
// do something
);
3、源码下载地址(解压即用)
百度网盘提取地址:
链接:https://pan.baidu.com/s/1bm50Dbq-AqZkuqgIgrUlgw
提取码:hdd6
123网盘提取地址(不限速)
链接:https://www.123pan.com/s/ZxkUVv-dFJ4.html
提取码:hdd6
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echarts重写图例点击事件
echarts version: 3.1.2
修改图例点击事件样例代码:
- 当第一次点击图例时,只显示点击的图例。
- 当还剩一个图例被
取消选中
后,自动全选中所有图例。
var triggerAction = function(action, selected)
legend = [];
for ( name in selected)
if (selected.hasOwnProperty(name))
legend.push(name: name);
myChart.dispatchAction(
type: action,
batch: legend
);
;
var isFirstUnSelect = function(selected)
var unSelectedCount = 0;
for ( name in selected)
if (!selected.hasOwnProperty(name))
continue;
if (selected[name] == false)
++unSelectedCount;
return unSelectedCount==1;
;
var isAllUnSelected = function(selected)
var selectedCount = 0;
for ( name in selected)
if (!selected.hasOwnProperty(name))
continue;
// 所有 selected Object 里面 true 代表 selected, false 代表 unselected
if (selected[name] == true)
++selectedCount;
return selectedCount==0;
;
myChart.on(‘legendselectchanged‘, function(obj)
var selected = obj.selected;
var legend = obj.name;
// 使用 legendToggleSelect Action 会重新触发 legendselectchanged Event,导致本函数重复运行
// 使得 无 selected 对象
if (selected != undefined)
if (isFirstUnSelect(selected))
triggerAction(‘legendToggleSelect‘, selected);
else if (isAllUnSelected(selected))
triggerAction(‘legendSelect‘, selected);
);
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