vue+vuex+axios+echarts Draw a dynamically updated map of China

I. Build projects and install plug-ins

# Install vue-cli
npm install vue-cli -g

# Initialize project
vue init webpack china-map

# Cut into Catalog
cd china-map

# Installation Project Dependency
npm install

# Install vuex
npm install vuex --save

# Install axios
npm install axios --save

# Install ECharts
npm install echarts --save

II. Project structure

├── index.html
├── main.js
├── components
│   └── index.vue
└── store
    ├── index.js          # Assemble modules and export store files
    └── modules
        └── ChinaMap.js   # China Map Vuex Module

3. Introduce maps of China and draw basic charts

1. Introduce Echarts charts and groups related to Chinese maps as needed.

// Main module
let echarts = require('echarts/lib/echarts')
// Scatter plot
require('echarts/lib/chart/scatter')
// Scatter map enlargement
require('echarts/lib/chart/effectScatter')
// Map
require('echarts/lib/chart/map')
// Legend
require('echarts/lib/component/legend')
// prompt box
require('echarts/lib/component/tooltip')
// Map geo
require('echarts/lib/component/geo')

2. If you import a Chinese Map JS file, the map will be automatically registered; you can also import a json file by axios, which requires manual registration.Echarts.registerMap('China',ChinaJson.data).

// China Map JS File
require('echarts/map/js/china')

3. Prepare a DOM container with a fixed width and height and initialize an echarts instance inside mounted.

DOM Container

<template>
  <div id="china-map"></div>
</template>

Initialize echarts instance

let chinaMap = echarts.init(document.getElementById('china-map'))

4. Set the initial blank map, there are many echarts parameters to set here, reference ECharts Configuration Item Manual.

chinaMap.setOption({
    backgroundColor: '#272D3A',
    // Title
    title: {
      text: 'China Map Shining',
      left: 'center',
      textStyle: {
        color: '#fff'
      }
    },
    // Tips for dots on the map
    tooltip: {
      trigger: 'item',
      formatter: function (params) {
        return params.name + ' : ' + params.value[2]
      }
    },
    // Legend button click to select which not to show
    legend: {
      orient: 'vertical',
      left: 'left',
      top: 'bottom',
      data: ['Regional heat', 'top5'],
      textStyle: {
        color: '#fff'
      }
    },
    // Geographic coordinate system components
    geo: {
      map: 'china',
      label: {
        // true displays the city name
        emphasis: {
          show: false
        }
      },
      itemStyle: {
        // Map Background Color
        normal: {
          areaColor: '#465471',
          borderColor: '#282F3C'
        },
        // When suspended
        emphasis: {
          areaColor: '#8796B4'
        }
      }
    },
    // Series List
    series: [
      {
        name: 'Regional heat',
        // Type of table Here is the scatter
        type: 'scatter',
        // Using geographic coordinate systems, specify the corresponding geographic coordinate system components through geoIndex
        coordinateSystem: 'geo',
        data: [],
        // Marker size
        symbolSize: 12,
        // Display values on dots while the mouse is hovering
        label: {
          normal: {
            show: false
          },
          emphasis: {
            show: false
          }
        },
        itemStyle: {
          normal: {
            color: '#ddb926'
          },
          // The dot style changes when the mouse hovers
          emphasis: {
            borderColor: '#fff',
            borderWidth: 1
          }
        }
      },
      {
        name: 'top5',
        // Type of table Here is the scatter
        type: 'effectScatter',
        // Using geographic coordinate systems, specify the corresponding geographic coordinate system components through geoIndex
        coordinateSystem: 'geo',
        data: [],
        // Marker size
        symbolSize: 12,
        showEffectOn: 'render',
        rippleEffect: {
          brushType: 'stroke'
        },
        hoverAnimation: true,
        label: {
          normal: {
            show: false
          }
        },
        itemStyle: {
          normal: {
            color: '#f4e925',
            shadowBlur: 10,
            shadowColor: '#333'
          }
        },
        zlevel: 1
      }
    ]
  })

4. Configure Vuex to manage and distribute data

1. In ChinaMap.js Vuex and axios were introduced.

import axios from 'axios'

2. Set the necessary variables.

const state = {
  geoCoordMap: {'Hong Kong Special Administrative Region': [114.08, 22.2], 'Macao Special Administrative Region': [113.33, 22.13], 'Taipei': [121.5, 25.03]/*Wait*/},
  // Glowing City
  showCityNumber: 5,
  showCount: 0,
  // Is loading required
  isLoading: true
}

3. Grab background data in actions and update the map.

const actions = {
  fetchHeatChinaRealData ({state, commit}, chartsObj) {
    axios.get('static/data/heatChinaRealData.json')
      .then(
        (res) => {
          let data = res.data
          let paleData = ((state, data) => {
            let arr = []
            let len = data.length
            while (len--) {
              let geoCoord = state.geoCoordMap[data[len].name]
              if (geoCoord) {
                arr.push({
                  name: data[len].name,
                  value: geoCoord.concat(data[len].value)
                })
              }
            }
            return arr
          })(state, data)
          let lightData = paleData.sort((a, b) => {
            return b.value - a.value
          }).slice(0, state.showCityNumber)
          chartsObj.setOption({
            series: [
              {
                name: 'Regional heat',
                data: paleData
              },
              {
                name: 'top5',
                data: lightData
              }
            ]
          })
        }
      )
  }
}

Now npm run dev can see the small yellow dots that are flashing on the map of China.If you want to change her to make the presentation dynamic, you canIndex.vueAdd:

chinaMap.showLoading(showLoadingDefault)
this.$store.commit('openLoading')
this.$store.dispatch('fetchHeatChinaRealData', chinaMap)
setInterval(() => {
    this.$store.dispatch('fetchHeatChinaRealData', chinaMap)
}, 1000)

stay ChinaMap.js fetchHeatChinaRealData modification in mutations of actions in:

let lightData = paleData.sort((a, b) => {
    return b.value - a.value
}).slice(0 + state.showCount, state.showCityNumber + state.showCount)
if (state.isLoading) {
    chartsObj.hideLoading()
    commit('closeLoading')
}

5. Other

1. Don't forget toMain.js Vuex is introduced.

import Vue from 'vue'
import Index from './components/index.vue'
import store from './store/index'

let ChinaMap = new Vue({
  el: '#app',
  store,
  template: '<Index/>',
  components: {Index}
})

Vue.use(ChinaMap)

2. Case Code

GitHub

vue+vuex+axios+echarts Draw a dynamically updated map of China

Tags: Vue axios npm JSON

Posted on Mon, 20 Jul 2020 11:29:24 -0400 by drorshem