332 lines
11 KiB
Markdown
332 lines
11 KiB
Markdown
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# echarts 图表 <span style="font-size:16px;">👑👑👑👑👑 <span style="background:#ff9d00;padding:2px 4px;color:#fff;font-size:10px;border-radius: 3px;">全端</span></span>
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> 一个基于 JavaScript 的开源可视化图表库 [查看更多 站点1](https://limeui.qcoon.cn/#/echart) | [查看更多 站点2](http://liangei.gitee.io/limeui/#/echart) <br>
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> 基于 echarts 做了兼容处理，更多示例请访问 [uni示例 站点1](https://limeui.qcoon.cn/#/echart-example) | [uni示例 站点2](http://liangei.gitee.io/limeui/#/echart-example) | [官方示例](https://echarts.apache.org/examples/zh/index.html) <br>
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> Q群：1046793420 <br>
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## 平台兼容
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| H5 | 微信小程序 | 支付宝小程序 | 百度小程序 | 头条小程序 | QQ 小程序 | App |
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| --- | ---------- | ------------ | ---------- | ---------- | --------- | ---- |
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| √ | √ | √ | √ | √ | √ | √ |
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## 安装
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- 第一步、在uniapp 插件市场 找到 [百度图表](https://ext.dcloud.net.cn/plugin?id=4899) 导入
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- 第二步、安装 echarts 或者直接使用插件内的echarts.min文件
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```cmd
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pnpm add echarts
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-or-
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npm install echarts
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```
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**注意**
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* 🔔 必须使用hbuilderx 3.4.8-alpha及以上
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* 🔔 echarts 5.3.0及以上
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* 🔔 如果是 `cli` 项目需要主动 `import` 插件
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```js
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import LEchart from '@/uni_modules/lime-echart/components/l-echart/l-echart.vue';
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export default {
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components: {LEchart}
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}
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```
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## 代码演示
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### 基础用法
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```html
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<view><l-echart ref="chart" @finished="init"></l-echart></view>
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```
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```js
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// 方式一：自定义包
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// 使用插件内提供的echarts.min
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// 或在官网自定义包：https://echarts.apache.org/zh/builder.html
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// 注意 插件内的包是umd格式的，如果你是vue3请使用esm格式的包 https://github.com/apache/echarts/tree/master/dist
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import * as echarts from '@/uni_modules/lime-echart/static/echarts.min'
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// 方式二：全量包
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// 如果你使用 npm 安装了 echarts
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import * as echarts from 'echarts'
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// 方式三：按需引入
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// 按需引入 开始
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import * as echarts from 'echarts/core';
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import {LineChart, BarChart} from 'echarts/charts';
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import {TitleComponent,TooltipComponent,GridComponent, DatasetComponent, TransformComponent, LegendComponent } from 'echarts/components';
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// 标签自动布局，全局过渡动画等特性
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import {LabelLayout,UniversalTransition} from 'echarts/features';
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// 引入 Canvas 渲染器，注意引入 CanvasRenderer 是必须的一步
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import {CanvasRenderer} from 'echarts/renderers';
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// 按需引入 注册必须的组件
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echarts.use([
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LegendComponent,
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TitleComponent,
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TooltipComponent,
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GridComponent,
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DatasetComponent,
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TransformComponent,
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LineChart,
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BarChart,
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LabelLayout,
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UniversalTransition,
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CanvasRenderer
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]);
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//-------------按需引入结束------------------------
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export default {
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data() {
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return {
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option: {
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tooltip: {
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trigger: 'axis',
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axisPointer: {
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type: 'shadow'
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},
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confine: true
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},
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legend: {
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data: ['热度', '正面', '负面']
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},
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grid: {
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left: 20,
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right: 20,
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bottom: 15,
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top: 40,
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containLabel: true
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},
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xAxis: [
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{
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type: 'value',
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axisLine: {
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lineStyle: {
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color: '#999999'
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}
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},
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axisLabel: {
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color: '#666666'
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}
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}
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],
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yAxis: [
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{
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type: 'category',
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axisTick: { show: false },
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data: ['汽车之家', '今日头条', '百度贴吧', '一点资讯', '微信', '微博', '知乎'],
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axisLine: {
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lineStyle: {
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color: '#999999'
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}
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},
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axisLabel: {
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color: '#666666'
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}
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}
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],
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series: [
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{
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name: '热度',
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type: 'bar',
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label: {
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normal: {
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show: true,
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position: 'inside'
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}
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},
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data: [300, 270, 340, 344, 300, 320, 310],
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},
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{
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name: '正面',
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type: 'bar',
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stack: '总量',
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label: {
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normal: {
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show: true
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}
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},
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data: [120, 102, 141, 174, 190, 250, 220]
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},
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{
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name: '负面',
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type: 'bar',
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stack: '总量',
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label: {
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normal: {
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show: true,
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position: 'left'
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}
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},
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data: [-20, -32, -21, -34, -90, -130, -110]
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}
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]
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},
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};
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},
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// 组件能被调用必须是组件的节点已经被渲染到页面上
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// 1、在页面mounted里调用，有时候mounted 组件也未必渲染完成
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mounted() {
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// init(echarts, theme?:string, opts?:{}, chart => {})
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// echarts 必填， 非nvue必填，nvue不用填
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// theme 可选，应用的主题，目前只支持名称，如：'dark'
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// opts = { // 可选
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// locale?: string // 从 `5.0.0` 开始支持
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// }
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// chart => {} ， callback 返回图表实例
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this.$refs.chart.init(echarts, chart => {
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chart.setOption(this.option);
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});
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},
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// 2、或者使用组件的finished事件里调用
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methods: {
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async init() {
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// chart 图表实例不能存在data里
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const chart = await this.$refs.chart.init(echarts);
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chart.setOption(this.option)
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}
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}
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}
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```
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## 数据更新
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- 使用 `ref` 可获取`setOption`设置更新
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```js
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this.$refs.chart.setOption(data)
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```
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## 图表大小
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- 在有些场景下，我们希望当容器大小改变时，图表的大小也相应地改变。
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```js
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// 默认获取容器尺寸
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this.$refs.chart.resize()
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// 指定尺寸
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this.$refs.chart.resize({width: 375, height: 375})
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```
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## 自定义Tooltips
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- nvue 不支持
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由于除H5之外都不存在dom，但又有tooltips个性化的需求，代码就不贴了，看示例吧
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```
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代码位于/uni_modules/lime-echart/component/lime-echart
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```
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## 插件标签
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- 默认 l-echart 为 component
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- 默认 lime-echart 为 demo
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```html
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// 在任意地方使用可查看domo, 代码位于/uni_modules/lime-echart/component/lime-echart
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<lime-echart></lime-echart>
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```
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## 常见问题
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- 钉钉小程序 由于没有`measureText`,模拟的`measureText`又无法得到当前字体的`fontWeight`,故可能存在估计不精细的问题
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- 微信小程序 `2d` 只支持 真机调试2.0
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- 微信开发工具会出现 `canvas` 不跟随页面的情况，真机不影响
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- 微信开发工具会出现 `canvas` 层级过高的问题，真机一般不受影响，可以先测只有两个元素的页面看是否会有层级问题。
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- toolbox 不支持 `saveImage`
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- echarts 5.3.0 的 lines 不支持 trailLength，故需设置为 `0`
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- dataZoom H5不要设置 `showDetail`
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- 如果微信小程序的`tooltip`文字有阴影，可能是微信的锅，临时解决方法是`tooltip.shadowBlur = 0`
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- 如果钉钉小程序上传时报安全问题`Uint8Clamped`,可以向钉钉反馈是安全代码扫描把Uint8Clamped数组错误识别了，也可以在 echarts 文件修改`Uint8Clamped`
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```js
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// 找到这段代码把代码中`Uint8Clamped`改成`Uint8_Clamped`，再把下划线去掉，不过直接去掉`Uint8Clamped`也是可行的
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// ["Int8","Uint8","Uint8Clamped","Int16","Uint16","Int32","Uint32","Float32","Float64"],(function(t,e){return t["[object "+e+"Array]"]
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// 改成如下
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["Int8","Uint8","Uint8_Clamped","Int16","Uint16","Int32","Uint32","Float32","Float64"],(function(t,e){return t["[object "+e.replace('_','')+"Array]"]
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```
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### vue3
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如果您是使用 **vite + vue3** 非微信小程序可能会遇到`echarts`文件缺少`wx`判断导致无法使用或缺少`tooltip`<br>
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方式一：可以在`echarts.min.js`文件开头增加以下内容，参考插件内的echart.min.js的做法
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```js
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var prefix = () => {
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var UNDEFINED = 'undefined'
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if(typeof wx !== UNDEFINED) return wx // 微信
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if(typeof tt !== UNDEFINED) return tt // 字节 飞书
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if(typeof swan !== UNDEFINED) return swan // 百度
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if(typeof my !== UNDEFINED) return my // 支付宝
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if(typeof dd !== UNDEFINED) return dd // 钉钉
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if(typeof ks !== UNDEFINED) return ks // 快手
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if(typeof jd !== UNDEFINED) return jd // 京东
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if(typeof qa !== UNDEFINED) return qa // 快应用
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if(typeof qq !== UNDEFINED) return qq // qq
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if(typeof qh !== UNDEFINED) return qh // 360
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if(typeof uni !== UNDEFINED) return uni
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return null
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}
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//在 !function(t,e){"object"==typeof 下面加入 可能是第36行
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var wx = prefix();
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/*! *****************************************************************************
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Copyright (c) Microsoft Corporation.
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```
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方式二：在`vite.config.js`的`define`设置环境
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```js
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// 或者在`vite.config.js`的`define`设置环境
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import { defineConfig } from 'vite';
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import uni from '@dcloudio/vite-plugin-uni';
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const UNI_PLATFORM = {
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"app": "uni",
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"web": "uni",
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"mp-weixin": "wx",
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"mp-baidu": "swan",
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"mp-alipay": "my",
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"mp-toutiao": "tt",
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"mp-lark": "tt",
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"mp-qq": "qq",
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"mp-kuaishou": "ks",
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"mp-jd": "jd",
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"mp-360": "qh",
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"quickapp-webview-union": "qa",
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"quickapp-webview-huawei": "qa",
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"quickapp-webview": "qa",
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}
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export default defineConfig({
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plugins: [uni()],
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define: {
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global: UNI_PLATFORM[process.env.UNI_PLATFORM],
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wx: UNI_PLATFORM[process.env.UNI_PLATFORM]
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}
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});
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```
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## Props
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| 参数 | 说明 | 类型 | 默认值 | 版本 |
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| --------------- | -------- | ------- | ------------ | ----- |
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| custom-style | 自定义样式 | `string` | - | - |
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| type | 指定 canvas 类型 | `string` | `2d` | |
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| is-disable-scroll | 触摸图表时是否禁止页面滚动 | `boolean` | `false` | |
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| beforeDelay | 延迟初始化 (毫秒) | `number` | `30` | |
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| enableHover | PC端使用鼠标悬浮 | `boolean` | `false` | |
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## 事件
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| 参数 | 说明 |
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| --------------- | --------------- |
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| init(echarts, chart => {}) | 初始化调用函数,第一个参数是传入`echarts`,第二个参数是回调函数，回调函数的参数是 `chart` 实例 |
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| setChart(chart => {}) | 已经初始化后，请使用这个方法，是个回调函数，参数是 `chart` 实例 |
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| setOption(data) | [图表配置项](https://echarts.apache.org/zh/option.html#title)，用于更新 ，传递是数据 `option` |
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| clear() | 清空当前实例，会移除实例中所有的组件和图表。 |
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| dispose() | 销毁实例 |
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| showLoading() | 显示加载 |
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| hideLoading() | 隐藏加载 |
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| [canvasToTempFilePath](https://uniapp.dcloud.io/api/canvas/canvasToTempFilePath.html#canvastotempfilepath)(opt) | 用于生成图片,与官方使用方法一致，但不需要传`canvasId` |
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## 打赏
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如果你觉得本插件，解决了你的问题，赠人玫瑰，手留余香。
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