Echarts 5 动态按需引入图表
官网提供的按需引入方法为全量按需引入,在打包分离中,仍旧存在使用不到的图表被打包进去。例如:组件A使用了折线图、柱状图,组件B只用到了折线图,但是打包组件B的时候,柱状图也会被打包进去。
本文提供一种动态按需引入的思路,使得只用到折线图的组件B,打包的时候只打包折线图,不会将组件A用到的柱状图也打包进去。
目录结构:
Index.ts 如下:
// 引入 echarts 核心模块,核心模块提供了 echarts 使用必须要的接口。
import * as ECHARTS from "echarts/core";
import type { ComposeOption } from "echarts/core";
import CORE, { CORE_ECOption } from "./Core";
import { LineChart_ECOption } from "./LineChart";
import { BarChart_ECOption } from "./BarChart";
import { RadarChart_ECOption } from "./RadarChart";
// 通过 ComposeOption 来组合出一个只有必须组件和图表的 Option 类型
export type ECOption = ComposeOption<CORE_ECOption | LineChart_ECOption | BarChart_ECOption | RadarChart_ECOption>;
class Echarts {
public echarts: any;
constructor(type: string[], callback: any) {
// 注册必须的组件
ECHARTS.use([...CORE]);
const charts: any = [];
type!.map((item: any) => {
const res: any = import(/* webpackChunkName: "echarts" */ `./${item}`);
charts.push(res);
});
Promise.all(charts).then((res: any) => {
res.map((item: any) => {
ECHARTS.use(item.default);
});
callback(ECHARTS);
});
}
}
export default Echarts;
Core.ts 如下:
// 引入标题,提示框,直角坐标系,数据集,内置数据转换器组件,组件后缀都为 Component
import {
TitleComponent,
TooltipComponent,
GridComponent,
DatasetComponent,
TransformComponent,
ToolboxComponent,
LegendComponent
} from "echarts/components";
// 标签自动布局、全局过渡动画等特性
import { LabelLayout, UniversalTransition } from "echarts/features";
// 组件类型的定义后缀都为 ComponentOption
import type {
TitleComponentOption,
TooltipComponentOption,
GridComponentOption,
DatasetComponentOption,
ToolboxComponentOption,
LegendComponentOption
} from "echarts/components";
// 引入 Canvas 渲染器,注意引入 CanvasRenderer 或者 SVGRenderer 是必须的一步
import { CanvasRenderer } from "echarts/renderers";
// 通过 ComposeOption 来组合出一个只有必须组件和图表的 Option 类型
export type CORE_ECOption =
| TitleComponentOption
| TooltipComponentOption
| GridComponentOption
| DatasetComponentOption
| ToolboxComponentOption
| LegendComponentOption;
const CORE = [
TitleComponent,
TooltipComponent,
GridComponent,
DatasetComponent,
TransformComponent,
ToolboxComponent,
LegendComponent,
LabelLayout,
UniversalTransition,
CanvasRenderer
];
export default CORE;
BarChart.ts 如下:
import { BarChart } from "echarts/charts";
// 系列类型的定义后缀都为 SeriesOption
import type { BarSeriesOption } from "echarts/charts";
export type BarChart_ECOption = BarSeriesOption;
export default BarChart;
LineChart.ts 如下:
import { LineChart } from "echarts/charts";
// 系列类型的定义后缀都为 SeriesOption
import type { LineSeriesOption } from "echarts/charts";
// 通过 ComposeOption 来组合出一个只有必须组件和图表的 Option 类型
export type LineChart_ECOption = LineSeriesOption;
export default LineChart;
RadarChart.ts 如下:
import { RadarChart } from "echarts/charts";
// 系列类型的定义后缀都为 SeriesOption
import type { RadarSeriesOption } from "echarts/charts";
// 组件类型的定义后缀都为 ComponentOption
import type { RadarComponentOption } from "echarts/components";
// 通过 ComposeOption 来组合出一个只有必须组件和图表的 Option 类型
export type RadarChart_ECOption = RadarComponentOption | RadarSeriesOption;
export default RadarChart;
如果项目中还用到其他图表类型,则按照具体需要引入即可。
可以根据具体业务进行调用封装,下面是封装的示例 util.ts:
import Echarts from "/echarts/Index";
export const renderEcharts = async (type: string[], dom: string, option: any = {}, callback?: any) => {
if (!dom) return;
new Echarts(type, (echart: any) => {
const _dom: any = document.querySelector(dom);
const echarts_instance = echart.init(_dom);
echarts_instance.setOption(option);
window.addEventListener("resize", function () {
echarts_instance.resize();
echarts_instance.clear();
echarts_instance.setOption(option);
});
_dom?.addEventListener("touchend", () => {
setTimeout(() => {
echarts_instance.dispatchAction({
type: "hideTip"
});
echarts_instance.dispatchAction({
type: "updateAxisPointer"
});
}, 1000);
});
callback && callback(echarts_instance);
});
};
具体调用:
let echarts_instance = null;
const options = {// 具体的option }
renderEcharts(["LineChart", "BarChart"], "#echarts_box",options, (instance) => {
echarts_instance = instance;
});
来源:https://www.cnblogs.com/Man-Dream-Necessary/p/18371493
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