echarts环状饼图默认选中且图例可点击选择二次封装

刺骨的言语ヽ痛彻心扉 2022-12-27 06:28 778阅读 0赞

## 核心库 ##

*  echarts
 *  lodash
 *  ResizeListener

## 代码 ##

<template>
        <div class="charts" ref="charts"></div>
    </template>
    
    <script>
    import echarts from 'echarts';
    import {  merge, cloneDeep } from 'lodash';
    import ResizeListener from 'element-resize-detector';
    
    export default { 
        name: 'ChartBar',
        props: { 
            extraOption: {  // 其他配置项
                type: Object,
                default: () => ({ })
            }
        },
        watch: { 
            extraOption: { 
                immediate: true,
                deep: true,
                handler () { 
                    this.updateChartView();
                }
            },
        },
        data () { 
            return { 
                myChart: null, // 图表对象
                option: {  // 配置项
                    avoidLabelOverlap: true,
                    legend: { 
                        itemHeight: 14,
                        itemWidth: 14,
                        icon: "circle",
                        orient: 'vertical',
                        zlevel: 999,
                        z: 999,
                        left: '62%',
                        top: '20%',
                        data: [],
                        formatter: (name) => { 
                            const arr = [
                                '{aa|' + name + '}'
                            ]
                            return arr.join('')
                        },
                        textStyle: { 
                            rich: { 
                                aa: { 
                                    fontSize: 14,
                                    color: '#666666',
                                    fontWeight: 'normal',
                                    padding: [-2, 0, 0, 5],
                                    lineHeight: 18
                                },
                            }
                        },
                        selectedMode: true, // 图例是否可点击
                    },
                    tooltip: { 
                        confine: true, // 将图表限制在区域内
                    },
                    series: [
                        { 
                            legendHoverLink: false, // 是否启用图例 hover 时的联动高亮
                            type: 'pie',
                            radius: ['0', '66%'],
                            center: ['30%', '52%'],
                            avoidLabelOverlap: true, // 是否启用防止标签重叠策略
                            hoverAnimation: true, // 鼠标移入的动画效果
                            hoverOffset: 4,
                            data: [],
                        }
                    ],
                    color: ['#1fa776', '#f6b239', '#1fb8f1', '#ff9f7f', '#fb7293', '#67e0e3', '#fb7293', '#e062ae', '#e690d1', '#e7bcf3', '#9d96f5', '#8378ea', '#96bfff', '#859e41', '#9e7341', '#78419e', '#9e416d', '#414c9e'],
                },
                index: 0
            }
        },
        methods: { 
    
            updateChartView () {  // 更新视图
                if (!this.myChart) return;
                const fullOption = this.mergeDataToOption();
                this.myChart.setOption(fullOption, true);
                // 设置饼图默认选中一个
                this.selectedOnePie();
            },
    
            mergeDataToOption () {  // 合并并将数据加入到配置项
                return merge(
                    { },
                    this.option,
                    this.extraOption
                )
            },
    
            selectedOnePie () {  // 默认选中一个饼图项
                this.myChart.dispatchAction({  type: 'highlight', dataIndex: this.index }); // dataIndex属性为data传入的索引值
                this.myChart.on('mouseover', (e) => {  // 当鼠标移入的时候 使默认的索引值去除默认选中
                    if (e.dataIndex !== this.index) { 
                        this.myChart.dispatchAction({  type: 'downplay', dataIndex: this.index });
                    }
                });
                this.myChart.on('mouseout', (e) => {  // 当鼠标移出的时候，默认选中一项
                    this.myChart.dispatchAction({  type: 'highlight', dataIndex: this.index });
                });
            },
    
            addChartResizeListener () {  // 监听元素变化
                // 创建实例带参
                const instance = ResizeListener({ 
                    strategy: 'scroll',
                    callOnAdd: true
                });
    
                // 监听元素大小的变化
                instance.listenTo(this.$refs.charts, () => { 
                    if (!this.myChart) return;
                    this.myChart.resize();
                });
            },
    
            handleClick () {  // 点击图表触发
                this.myChart.on('click', (event) => { 
                    this.$emit('chart_click', event);
                });
    
                // 此处处理图例可点击且选中对应项问题
                this.myChart.on('legendselectchanged', (event) => { 
                    const arr = cloneDeep(event.selected);
                    const newArr = []; // 将图例的对象的key和值重新组合一个数组，以便于后期逻辑处理
                    for (const key in arr) { 
                        newArr.push({ 
                            key: key,
                            value: arr[key]
                        })
                    }
                    this.myChart.dispatchAction({  type: 'downplay', dataIndex: this.index });
                    newArr.forEach((item, index) => { 
                        if (item.key === event.name) { 
                            if (item.value) {  // 当前图例为true状态时，让当前项选中
                                this.myChart.dispatchAction({  type: 'highlight', dataIndex: index });
                                this.index = index;
                            } else { 
                                // 如果当前点击图例为false的时候，默认让它的下一项选中，否则，再整个图例中查找选中的项目
                                if (newArr[index + 1] && newArr[index + 1].value) { 
                                    this.myChart.dispatchAction({  type: 'highlight', dataIndex: index + 1 });
                                    this.index = index + 1;
                                } else { 
                                    let findIndex;
                                    newArr.find((item, index) => { 
                                        if (item && item.value) { 
                                            findIndex = index;
                                        }
                                    })
                                    this.myChart.dispatchAction({  type: 'highlight', dataIndex: findIndex });
                                    this.index = findIndex;
                                }
                            }
                        }
                    })
                });
            }
        },
        mounted () { 
            if (!this.myChart) { 
                // 初始化图表
                this.myChart = echarts.init(this.$refs.charts);
    
                // 绘制图表
                this.updateChartView();
    
                // 设置饼图默认选中一个
                this.selectedOnePie();
    
                // 监听元素大小变化
                this.addChartResizeListener();
    
                // 绑定点击事件
                this.handleClick();
            }
        },
    }
    </script>
    
    <style lang="less" scoped>
        .charts { 
            width: 100%;
            height: 100%;
        }
    </style>

## 使用 ##

<template>
        <div>
            
            <ChartPie :extraOption="extraOption" v-if="extraOption.series[0].data && extraOption.series[0].data.length > 0"></ChartPie>
            <noDataChartsImg v-else></noDataChartsImg>
            <div class="unit">单位：只</div>
        </div>
    </template>
    
    <script>
    import lodash from 'lodash';
    import dateFormat from "dateformat";
    import {  getCauseStatistics } from '@/api/assetsAnalysisKanban/assetsDivestitureAnalysisQuery';
    import ChartPie from '@/view/streamline/assetsAnalysisKanban/common/charts/ChartPie';
    import noDataChartsImg from '../../common/chartsImg';
    
    export default { 
        components: { 
            ChartPie,
            noDataChartsImg
        },
        props: { 
            paramsGroup: { 
                type: Object,
                default: () => { }
            },
        },
        watch: { 
            paramsGroup: { 
                handler (val) { 
                    if (!lodash.isEmpty(val)) { 
                        this.getChartData();
                    }
                },
                deep: true
            }
        },
        data () { 
            return { 
                extraOption: { 
                    avoidLabelOverlap: true,
                    legend: { 
                        data: [],
                        top: 'middle',
                        height: 190,
                        left: '56%',
                        type: 'scroll',
                        pageIconColor: '#2f4554', // 翻页按钮的颜色
                        pageIconInactiveColor: '#aaa', // 翻页按钮不激活时（即翻页到头时）的颜色
                        pageIconSize: 10, // 翻页按钮大小
                        pageFormatter: ({ current, total}) => { 
                            return `${ current}/${ total}`;
                        }, // 隐藏翻页的数字
                        pageButtonGap: 10, // 图例控制块和图例项之间的间隔
                        pageButtonPosition: 'end', // 'end' 'start
                        pageButtonItemGap: 6, // 翻页按钮的两个之间的间距
                        bottom: '12%',
                        formatter: (name, index) => { 
                            let num = 0;
                            let text = '';
                            this.extraOption.series[0].data.forEach((item, index) => { 
                                if (item.name === name) { 
                                    num = item.value
                                    text = name.length > 3 ? name.substring(0, 3) + '...' : name;
                                }
                            })
                            const arr = [
                                '{aa|' + text + '}',
                                '{bb|' + num + '只}'
                            ]
                            return arr.join('')
                        },
                        textStyle: { 
                            rich: { 
                                aa: { 
                                    fontSize: 14,
                                    color: 'rgba(102, 102, 102, 1)',
                                    fontWeight: 'normal',
                                    padding: [-2, 0, 0, 5],
                                    lineHeight: 18,
                                    width: 50
                                },
                                bb: { 
                                    fontSize: 14,
                                    color: 'rgba(51, 51, 51, 1)',
                                    fontWeight: 'normal',
                                    padding: [-2, 0, 0, 5],
                                    lineHeight: 18
                                },
                            }
                        },
                    },
                    tooltip: { 
                        trigger: 'item',
                        confine: true, // 将图表限制在区域内
                        formatter: function (params) {  // 提示内容太多隔行显示内容
                            const str = `${ params.marker} ${ params.name} : ${ params.value}只`
                            return str
                        },
                    },
                    series: [
                        { 
                            radius: ['36%', '48%'],
                            center: ['27%', '50%'],
                            label: { 
                                normal: { 
                                    show: false,
                                    position: 'center',
                                    formatter: (item) => { 
                                        const arr = [
                                            '{a|' + item.percent + '}',
                                            '{b|' + '%}\n',
                                            '{c|' + (item.name.length > 8 ? item.name.substring(0, 8) + '...' : item.name) + '}'
                                        ]
                                        return arr.join('')
                                    },
                                    rich: { 
                                        a: { 
                                            color: '#64879f',
                                            fontSize: '24'
                                        },
                                        b: { 
                                            color: '#64879f',
                                            fontSize: '24',
                                            verticalAlign: 'middle'
                                        },
                                        c: { 
                                            color: '#666666',
                                            fontSize: '13',
                                            verticalAlign: 'middle',
                                            padding: [0, 0, 5, 0],
                                        }
                                    }
                                },
                                emphasis: {  // 高亮的图形样式和标签样式
                                    show: true
                                },
                            },
                            data: [],
                        }
                    ],
                }
            }
        },
        methods: { 
            getChartData () {  // 获取图表数据
                const params = { 
                    orgNo: this.paramsGroup.deptCode,
                    statisDateStart: dateFormat(this.paramsGroup.statisDateStart, "yyyy-mm"),
                    statisDateEnd: dateFormat(this.paramsGroup.statisDateEnd, "yyyy-mm"),
                }
                getCauseStatistics(params).then((res) => { 
                    const jsonData = res.data;
                    if (jsonData.status === 1 && jsonData.code === 200 && !lodash.isEmpty(jsonData.data)) { 
                        const chartsData = jsonData.data.chartsData;
                        this.extraOption.series[0].data = [];
                        this.$nextTick(() => { 
                            this.extraOption.legend.data = chartsData.legendData;
                            this.extraOption.series[0].data = chartsData.seriesData;
                        })
                    }
                })
            },
        }
    }
    </script>

## 效果图 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l3MDB5dw_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l3MDB5dw_size_16_color_FFFFFF_t_70 1]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l3MDB5dw_size_16_color_FFFFFF_t_70]: /images/20221120/10a6af3906914926bb29a8151c4a2602.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l3MDB5dw_size_16_color_FFFFFF_t_70 1]: /images/20221120/024e608e4a9f44e6aa8cbc6cf4af6c48.png