写在前面

业务场景x轴的文字太多，会出现遮挡问题，想到文字倾斜展示，页面不美观，于是想到使用滚动条优化趋势图。

<template>
  <div id="storeDown" style="height: 400px;width:100%"/>
</template>

<script>
// 引入 ECharts 主模块

// var echarts = require('echarts/lib/echarts')
// 引入柱状图
import { round } from 'echarts/src/util/number'

require('echarts/lib/chart/bar')
// 引入折线图
require('echarts/lib/chart/line')
// 引入提示框和标题组件
require('echarts/lib/component/tooltip')
// require('echarts/lib/component/title');
require('echarts/lib/component/toolbox')
require('echarts/lib/component/legend')
export default {
  name: 'StoreGoDownEcharts',
  props: {
    itemList: {
      type: Array,
      default: () => []
    },
    type: {
      type: String,
      default: () => ''
    },
    th: {
      type: String,
      default: () => ''
    }
  },
  data() {
    return {
    }
  },
  watch: {
    itemList: {
      handler(newData, oldData) {
        if (this.itemList.length > 0) {
          this.myCharts5()
        }
      }
    }
  },
  mounted() {
    this.loadata()
  },
  methods: {
    loadata() {
      this.myCharts5()
    },
    myCharts5() {
      const that = this
      // const that = this
      var x_data = that.itemList.map((item) => {
        return item.store_name
      })
      var serve = []
      var serve2 = []
      console.log(that.th)
      var cycle = this.th === '同比' ? '同期' : '上周'
      if (this.type === '销售额') {
        serve = that.itemList.map((item) => {
          return { value: round(item.sales / 10000, 2), Name: this.type, th_name: this.th, th: this.th === '同比' ? item.sales_tongbi : item.sales_huanbi }
        })
        serve2 = that.itemList.map((item) => {
          return this.th === '同比' ? round(item.l_sales / 10000, 2) : round(item.l_week_tongqi_sales / 10000, 2)
        })
      } else if (this.type === '毛利额') {
        serve = that.itemList.map((item) => {
          return { value: round(item.gross / 10000, 2), Name: this.type, th_name: this.th, th: this.th === '同比' ? item.gross_tongbi : item.gross_huanbi }
        })
        serve2 = that.itemList.map((item) => {
          return this.th === '同比' ? round(item.l_gross / 10000, 2) : round(item.l_week_tongqi_gross / 10000, 2)
        })
      }
      var barwidthData = ''
      if (serve.length < 4 && serve2.length < 4) {
        barwidthData = '10%'
      }
      var myChart = this.$echarts.init(document.getElementById('storeDown'))
      // that.myReize(myChart)
      var option = {
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'shadow'
          },
          formatter: function(params) {
            var store_name = params[0].name
            var type_0 = params[1].data.Name
            var th_name = params[1].data.th_name
            var cycle = params[0].seriesName
            var value = ''
            var value2 = ''
            var value3 = ''
            if (params[1].value) {
              value = params[1].value + '万元'
            } else {
              value = ''
            }
            if (params[0].value) {
              value2 = params[0].value + '万元'
            } else {
              value2 = ''
            }
            if (params[1].data.th) {
              value3 = Math.abs(params[1].data.th) + '%'
            } else {
              value3 = ''
            }
            var htmlStr = ''
            htmlStr = '<span style="font-size: 20px;font-weight: bold;color: #FEFEFE;line-height: 20px;">' + store_name + '</span>' +
                    '<br>' + '<span style="font-size: 16px;color: #FEFEFE;line-height: 22px;font-weight: bold; border-left:1px solid red ">&nbsp;&nbsp;' + type_0 + '</span>' +
              '<br>' + '<el-row style="display: flex;width: 200px"><el-col style="display: inline-block;width: 50%;">' + cycle + ':' + value2 + '</el-col>' + '<el-col style="display: inline-block;width: 50%;text-align: center">' + th_name + '<i class="el-icon-caret-bottom"></i></el-col></el-row>' +
              '<el-row style="display: flex;width: 200px"><span style="display: inline-block;width: 50%;">当日:' + value + '</span>' +
              '<span  style="display: inline-block;width: 50%;text-align: center">&nbsp;' + value3 + '</span></el-row>'
            return htmlStr
          }
        },
        xAxis: {
          type: 'category',
          data: x_data,
          triggerEvent: true,
          axisLabel: {
            interval: 0,
            rotate: -30,
            formatter: function(value) {
              if (value.length > 8) {
                value = value.substring(0, 7) + '..'
                return value
              } else {
                return value
              }
            }
          }
        },
        yAxis: {
          type: 'value',
          name: this.type + '(万元)'
        },
        legend: { data: [cycle, '当日'], top: '5px', right: '80px' },
        dataZoom: [
          {
            type: 'slider',
            show: true,
            start: 0,
            end: 40,
            handleSize: 8,
            yAxisIndex: null,
            width: '80%',
            height: '2%',
            bottom: '1',
            showDetail: false
          },
          {
            type: 'inside',
            start: 0,
            end: 100
          }
        ],
        series: [
          {
            name: cycle,
            data: serve2,
            barWidth: barwidthData,
            type: 'bar',
            itemStyle: {
              color: '#42B983'
            }
          },
          {
            name: '当日',
            data: serve,
            barWidth: barwidthData,
            type: 'bar',
            itemStyle: {
              color: '#CEF7D4'
            }
          }
        ]
      }
      myChart.setOption(option)
      window.addEventListener('resize', () => {
        myChart.resize()
      })
      that.extension(myChart)
      myChart.on('click', function(data) {
        // 添加点击事件
      })
    },
    extension(chart) {
      // 注意这里，是以X轴显示内容过长为例，如果是y轴的话，需要把params.componentType == 'xAxis'改为yAxis
      // 判断是否创建过div框,如果创建过就不再创建了
      // 该div用来盛放文本显示内容的，方便对其悬浮位置进行处理
      var elementDiv = document.getElementById('extension')
      if (!elementDiv) {
        var div = document.createElement('div')
        div.setAttribute('id', 'extension')
        div.style.display = 'block'
        document.querySelector('html').appendChild(div)
      }
      chart.on('mouseover', function(params) {
        if (params.componentType == 'xAxis') {
          var elementDiv = document.querySelector('#extension')
          // 设置悬浮文本的位置以及样式
          var elementStyle =
            'position: absolute;z-index: 99999;color: #fff;font-size: 12px;padding: 5px;display: inline;border-radius: 4px;background-color: #303133;box-shadow: rgba(0, 0, 0, 0.3) 2px 2px 8px'
          elementDiv.style.cssText = elementStyle
          elementDiv.innerHTML = params.value
          document.querySelector('html').onmousemove = function(event) {
            var elementDiv = document.querySelector('#extension')
            var xx = event.pageX - 10
            var yy = event.pageY + 15
            console.log('22', xx)
            elementDiv.style.top = yy + 'px'
            elementDiv.style.left = xx + 'px'
          }
        }
      })
      chart.on('mouseout', function(params) {
        // 注意这里，我是以X轴显示内容过长为例，如果是y轴的话，需要改为yAxis
        if (params.componentType == 'xAxis') {
          var elementDiv = document.querySelector('#extension')

          elementDiv.style.cssText = 'display:none'
        }
      })
    }
  }
}
</script>

<style scoped>

</style>

dataZoom 组件 用于区域缩放


参考文章：dataZoom 区域缩放组件

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