Vue2 封装 ECharts5.0+ 通用组件

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2年前写了这篇关于在 Vue2 中封装 Echarts 的文章。时过境迁,技术栈已过时,现在按照在 Vue3 中封装 Echarts 的思路和流程,重新整理一下当年的水文,看看 Vue2 的 Options API 在封装上有哪些差异。

和 Vue3 中相同的步骤以及问题,这里就不再赘述,大家可以直接翻阅 Vue3 的那篇文章,链接放在最后了。

技术栈及版本号

技术栈方面选用的还是:Vue2 + Typescript + Echarts,是不是有点旧瓶装新酒的感觉,哈哈哈~

部分依赖的版本号如下:

{
    "dependencies": {
        "@types/lodash-es": "^4.17.7",
        "echarts": "^5.4.2",
        "lodash-es": "^4.17.21",
        "vue": "^2.6.14",
    },
    "devDependencies": {
        "typescript": "~4.5.5",
    }
}

按需导入的配置文件

需要哪些 ECharts 组件就按需导入哪些,可以直接 copy 我的,然后按需修改:👉 config 配置文件

当然,你也可以直接参考 按需导入在 Typescript 中按需引入

组件容器与实例化

先搭一个基本的架子:

<script lang="ts">
import Vue, { PropType } from 'vue';
import { type EChartsType } from 'echarts/core';
import echarts, { type ECOption } from './config';

export default Vue.extend({
    props: {
        option: {
            type: Object as PropType<ECOption>,
            required: true,
            default: () => ({} as ECOption),
        },
        width: {
            type: String,
            required: true,
        },
        height: {
            type: String,
            required: true,
        },
        theme: {
            type: [String, Object],
            default: null,
        },
    },
    data() {
        return {
            chartInstance: undefined as EChartsType | undefined,
        };
    },
    computed: {
        chartRef(): HTMLDivElement {
            return this.$refs.chart as HTMLDivElement;
        },
    },
    watch: {
        option() {
            this.draw();
        },
    },
    methods: {
        draw() {
            this.chartInstance?.setOption(this.option, { notMerge: true });
        },
        init() {
            if (!this.$refs.chart) return;

            // 校验 Dom 节点上是否已经挂载了 ECharts 实例,只有未挂载时才初始化
            this.chartInstance = echarts.getInstanceByDom(this.chartRef);
            if (!this.chartInstance) {
                this.chartInstance = echarts.init(this.chartRef, this.theme, {
                    renderer: 'canvas',
                });
            }

            this.draw();
        },
    },
    mounted() {
        this.init();
    },
    beforeDestroy() {
        this.chartInstance?.dispose();
    },
});
</script>

<template>
    <div ref="chart" class="chart" :style="{ width, height }" />
</template>

chartRef: 当前的 DOM 节点,即 ECharts 的容器;

chartInstance:当前 DOM 节点挂载的 ECharts 实例,可用于调用实例上的方法,注册事件,自适应等;

draw:用于绘制 ECharts 图表,本质是调用实例的 setOption 方法;

init:初始化,在此获取 DOM 节点,挂载实例,注册事件,并调用 draw 绘制图表。

接下来,我们要一步步给架子添加常用的功能。

窗口自适应防抖

data 中准备一个自适应函数:

data() {
    return {
        resize: null as EventListenerOrEventListenerObject | null,
    }
}

methods 中添加一个用以生成具有防抖优化的自适应函数的工厂函数

import { debounce } from 'lodash-es';

debounceResize() {
    return debounce(() => {
        this.chartInstance?.resize({
            animation: { duration: 300 },
        });
    }, 500);
},

请注意,这里的 debounceResize 函数本身并不具备自适应功能,它只是给 ECharts 的 resize 函数包裹了一层防抖,并将包装后的函数返回了出来。

所以我们才在 data 里准备了一个 resize 变量,并在组件 created 的时候进行接收:

created() {
    this.resize = this.debounceResize();
}

好了,这时我们再去注册 resize 事件,自适应就能生效了:

mounted() {
    // 略...
    this.resize && window.addEventListener('resize', this.resize);
},
beforeDestroy() {
    // 略...
    this.resize && window.removeEventListener('resize', this.resize);
},

绑定事件

在初始化时,添加需要绑定的事件:

init() {
    // 略......

    if (!this.chartInstance) {
        // 略......

        // 绑定 ECharts 事件
        if (typeof this.onMouseover === 'function') {
            this.chartInstance.on('mouseover', (event: Object) => {
                this.onMouseover(
                    event,
                    this.chartInstance,
                    this.option
                );
            });
        }
        
        // 需要哪些, 添加哪些
    }

    this.draw();
},

完整代码

<script lang="ts">
import Vue, { PropType } from 'vue';
import { type EChartsType } from 'echarts/core';
import { debounce } from 'lodash-es';
import echarts, { type ECOption } from './config';

export default Vue.extend({
    props: {
        option: {
            type: Object as PropType<ECOption>,
            required: true,
            default: () => ({} as ECOption),
        },
        width: {
            type: String,
            required: true,
        },
        height: {
            type: String,
            required: true,
        },
        theme: {
            type: [String, Object],
            default: null,
        },
        loading: {
            type: Boolean,
            default: false,
        },
        onMouseover: {
            type: Function as PropType<(...args: any[]) => any>,
        },
        onMouseout: {
            type: Function as PropType<(...args: any[]) => any>,
        },
    },
    data() {
        return {
            chartInstance: undefined as EChartsType | undefined,
            resize: null as EventListenerOrEventListenerObject | null,
        };
    },
    computed: {
        chartRef(): HTMLDivElement {
            return this.$refs.chart as HTMLDivElement;
        },
    },
    watch: {
        option() {
            this.draw();
        },
        loading(loading) {
            if (this.chartInstance) {
                loading
                    ? this.chartInstance.showLoading()
                    : this.chartInstance.hideLoading();
            }
        },
    },
    methods: {
        draw() {
            this.chartInstance?.setOption(this.option, { notMerge: true });
        },
        init() {
            if (!this.$refs.chart) return;

            // 校验 Dom 节点上是否已经挂载了 ECharts 实例,只有未挂载时才初始化
            this.chartInstance = echarts.getInstanceByDom(this.chartRef);
            if (!this.chartInstance) {
                this.chartInstance = echarts.init(this.chartRef, this.theme, {
                    renderer: 'canvas',
                });

                // 绑定 ECharts 事件
                if (typeof this.onMouseover === 'function') {
                    this.chartInstance.on('mouseover', (event: Object) => {
                        this.onMouseover(
                            event,
                            this.chartInstance,
                            this.option
                        );
                    });
                }
                if (typeof this.onMouseout === 'function') {
                    this.chartInstance.on('mouseout', (event: Object) => {
                        this.onMouseout(event, this.chartInstance, this.option);
                    });
                }
            }

            this.draw();
        },
        debounceResize() {
            return debounce(() => {
                this.chartInstance?.resize({
                    animation: { duration: 300 },
                });
            }, 500);
        },
        resetChart() {
            if (this.chartInstance) {
                this.chartInstance.clear();
                this.draw();
            }
        },
    },
    created() {
        this.resize = this.debounceResize();
    },
    mounted() {
        this.init();
        this.resize && window.addEventListener('resize', this.resize);
    },
    beforeDestroy() {
        this.chartInstance?.dispose();
        this.resize && window.removeEventListener('resize', this.resize);
    },
});
</script>

<template>
    <div ref="chart" class="chart" :style="{ width, height }" />
</template>

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