使用ElementUI下拉实现echarts图例控制
<template>
<div class="block">
<div ref="main" style="width: 800px; height: 400px"></div>
<div>
<el-dropdown
placement=" bottom-start"
trigger="click"
:hide-on-click="false"
>
<span class="el-dropdown-link">
图例控制<i class="el-icon-arrow-down el-icon--right"></i>
</span>
<el-dropdown-menu slot="dropdown">
<el-dropdown-item v-for="item in options" :key="item.name"
><el-checkbox v-model="item.ischeck" @change="test(item)">{{
item.label
}}</el-checkbox></el-dropdown-item
>
</el-dropdown-menu>
</el-dropdown>
</div>
</div>
</template>
<script>
const cityOptions = ["上海", "北京", "广州", "深圳"];
import * as echarts from "echarts";
export default {
name: "time-demo",
data() {
return {
checkAll: false,
checkedCities: ["上海", "北京"],
cities: cityOptions,
isIndeterminate: true,
myChartInstance: {},
options: [
{
ischeck: true,
label: "all",
},
{
ischeck: true,
label: "2015",
},
{
ischeck: true,
label: "2016",
},
{
ischeck: true,
label: "2017",
},
],
};
},
mounted() {
this.buildCharts();
},
methods: {
test(d) {
var testd = this.myChartInstance;
if (d.label === "all" && d.ischeck) {
this.options.forEach(function (item) {
item.ischeck = true;
});
testd.dispatchAction({
type: "legendAllSelect",
});
} else if (d.label === "all" && !d.ischeck) {
testd.dispatchAction({
type: "legendAllSelect",
});
testd.dispatchAction({
type: "legendInverseSelect",
});
this.options.forEach(function (item) {
item.ischeck = false;
});
} else {
testd.dispatchAction({
type: "legendToggleSelect",
name: d.label,
});
var array = this.options;
console.log(d);
var count1 = 0;
var count2 = 0;
for (let index = 1; index < array.length; index++) {
const element = array[index];
if (element.ischeck) {
count1++;
} else {
count2++;
}
}
if (count1 == array.length - 1) {
this.options[0].ischeck = true;
}
if (count2 == array.length - 1) {
this.options[0].ischeck = false;
}
}
},
buildCharts() {
console.log(this.$refs.main);
var myChart = echarts.init(this.$refs.main);
this.myChartInstance = myChart;
// 绘制图表
myChart.setOption({
legend: {},
tooltip: {},
dataset: {
source: [
["product", "2015", "2016", "2017"],
["Matcha Latte", 43.3, 85.8, 93.7],
["Milk Tea", 83.1, 73.4, 55.1],
["Cheese Cocoa", 86.4, 65.2, 82.5],
["Walnut Brownie", 72.4, 53.9, 39.1],
],
},
xAxis: { type: "category" },
yAxis: {},
// Declare several bar series, each will be mapped
// to a column of dataset.source by default.
series: [{ type: "bar" }, { type: "bar" }, { type: "bar" }],
});
},
},
};
</script>
<style>
#app {
font-family: Avenir, Helvetica, Arial, sans-serif;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
text-align: center;
color: #2c3e50;
margin-top: 60px;
}
</style>

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