微信小程序中使用ECharts 异步加载数据的方法

互联网 18-6-27

这篇文章主要介绍了微信小程序中使用ECharts 异步加载数据的方法，非常不错，具有一定的参考借鉴价值,需要的朋友可以参考下

官网例子都是同步的，怎么引入及同步demo请移步官网

<view class="container">  <ec-canvas id="mychart-dom-multi-bar" canvas-id="mychart-multi-bar" ec="{{ ecBar }}"></ec-canvas>  <ec-canvas id="mychart-dom-multi-scatter" canvas-id="mychart-multi-scatter" ec="{{ ecScatter }}"></ec-canvas> </view>

import * as echarts from '../../ec-canvas/echarts'; Page({  data: {   ecBar: {    lazyLoad: true // 延迟加载   },   ecScatter: {    lazyLoad: true    }  },  onLoad(){   this.barComponent = this.selectComponent('#mychart-dom-multi-bar');   this.scaComponnet = this.selectComponent('#mychart-dom-multi-scatter');   this.init_bar();   this.init_sca();  },  init_bar: function (){   this.barComponent.init((canvas, width, height) => {    // 初始化图表    const barChart = echarts.init(canvas, null, {     width: width,     height: height    });    barChart.setOption(this.getBarOption());    // 注意这里一定要返回 chart 实例，否则会影响事件处理等    return barChart;   });  },  init_sca: function () {   this.scaComponnet.init((canvas, width, height) => {    // 初始化图表    const scaChart = echarts.init(canvas, null, {     width: width,     height: height    });    scaChart.setOption(this.getScaOption());    // 注意这里一定要返回 chart 实例，否则会影响事件处理等    return scaChart;   });  },  getBarOption:function(){   //return 请求数据   return {    color: ['#37a2da', '#32c5e9', '#67e0e3'],    tooltip: {     trigger: 'axis',     axisPointer: {      // 坐标轴指示器，坐标轴触发有效      type: 'shadow'    // 默认为直线，可选为：'line' | 'shadow'     }    },    legend: {     data: ['热度', '正面', '负面']    },    grid: {     left: 20,     right: 20,     bottom: 15,     top: 40,     containLabel: true    },    xAxis: [     {      type: 'value',      axisLine: {       lineStyle: {        color: '#999'       }      },      axisLabel: {       color: '#666'      }     }    ],    yAxis: [     {      type: 'category',      axisTick: { show: false },      data: ['汽车之家', '今日头条', '百度贴吧', '一点资讯', '微信', '微博', '知乎'],      axisLine: {       lineStyle: {        color: '#999'       }      },      axisLabel: {       color: '#666'      }     }    ],    series: [     {      name: '热度',      type: 'bar',      label: {       normal: {        show: true,        position: 'inside'       }      },      data: [300, 270, 340, 344, 300, 320, 310]     },     {      name: '正面',      type: 'bar',      stack: '总量',      label: {       normal: {        show: true       }      },      data: [120, 102, 141, 174, 190, 250, 220]     },     {      name: '负面',      type: 'bar',      stack: '总量',      label: {       normal: {        show: true,        position: 'left'       }      },      data: [-20, -32, -21, -34, -90, -130, -110]     }    ]   };  },  getScaOption:function(){   //请求数据    var data = [];   var data2 = [];   for (var i = 0; i < 10; i++) {    data.push(     [      Math.round(Math.random() * 100),      Math.round(Math.random() * 100),      Math.round(Math.random() * 40)     ]    );    data2.push(     [      Math.round(Math.random() * 100),      Math.round(Math.random() * 100),      Math.round(Math.random() * 100)     ]    );   }   var axisCommon = {    axisLabel: {     textStyle: {      color: '#C8C8C8'     }    },    axisTick: {     lineStyle: {      color: '#fff'     }    },    axisLine: {     lineStyle: {      color: '#C8C8C8'     }    },    splitLine: {     lineStyle: {      color: '#C8C8C8',      type: 'solid'     }    }   };   return {    color: ["#FF7070", "#60B6E3"],    backgroundColor: '#eee',    xAxis: axisCommon,    yAxis: axisCommon,    legend: {     data: ['aaaa', 'bbbb']    },    visualMap: {     show: false,     max: 100,     inRange: {      symbolSize: [20, 70]     }    },    series: [{     type: 'scatter',     name: 'aaaa',     data: data    },    {     name: 'bbbb',     type: 'scatter',     data: data2    }    ],    animationDelay: function (idx) {     return idx * 50;    },    animationEasing: 'elasticOut'   };  }, });

注意：异步加载时，ec-canvas标签加载显示要先于this.scaComponnet.init，否则会报错。

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