引用方法

import uCharts from '../../components/u-charts/u-charts.js';

模板写法

< canvas canvas-id="canvasColumn" id="canvasColumn" class="charts">

样式写法

.charts{width: 750upx; height:500upx;background-color: #FFFFFF;}

实例化方法

new uCharts({具体参数详见API参数章节})

注意事项

  • 传入uCharts的cWidth和cHeight，要与样式中的width和height相等，否则会造成canvas大小与预期不符。
  • 其他问题详见下章《常见问题》

代码示例

  1. <template>
  2.     <view class="qiun-columns">
  3.         <view class="qiun-bg-white qiun-title-bar qiun-common-mt" >
  4.             <view class="qiun-title-dot-light">柱状图</view>
  5.         </view>
  6.         <view class="qiun-charts">
  7.             <!--#ifdef MP-ALIPAY -->
  8.             <canvas canvas-id="canvasColumn" id="canvasColumn" class="charts" :style="{'width':cWidth*pixelRatio+'px','height':cHeight*pixelRatio+'px', 'transform': 'scale('+(1/pixelRatio)+')','margin-left':-cWidth*(pixelRatio-1)/2+'px','margin-top':-cHeight*(pixelRatio-1)/2+'px'}"></canvas>
  9.             <!--#endif-->
  10.             <!--#ifndef MP-ALIPAY -->
  11.             <canvas canvas-id="canvasColumn" id="canvasColumn" class="charts"></canvas>
  12.             <!--#endif-->
  13.         </view>
  14.     </view>
  15. </template>
  17. <script>
  18.     import uCharts from '../../components/u-charts/u-charts.js';
  19.     var _self;
  20.     var canvaColumn=null;
  21.     export default {
  22.         data() {
  23.             return {
  24.                 cWidth:'',
  25.                 cHeight:'',
  26.                 pixelRatio:1,
  27.                 serverData:''
  28.             }
  29.         },
  30.         onLoad() {
  31.             _self = this;
  32.             //#ifdef MP-ALIPAY
  33.             uni.getSystemInfo({
  34.                 success: function (res) {
  35.                     if(res.pixelRatio>1){
  36.                         //正常这里给2就行，如果pixelRatio=3性能会降低一点
  37.                         //_self.pixelRatio =res.pixelRatio;
  38.                         _self.pixelRatio =2;
  39.                     }
  40.                 }
  41.             });
  42.             //#endif
  43.             this.cWidth=uni.upx2px(750);
  44.             this.cHeight=uni.upx2px(500);
  45.             this.getServerData();
  46.         },
  47.         methods: {
  48.             getServerData(){
  49.                 uni.request({
  50.                     url: 'https://www.easy-mock.com/mock/5cc586b64fc5576cba3d647b/uni-wx-charts/chartsdata2',
  51.                     data:{
  52.                     },
  53.                     success: function(res) {
  54.                         console.log(res.data.data)
  55.                         //下面这个根据需要保存后台数据，我是为了模拟更新柱状图，所以存下来了
  56.                         _self.serverData=res.data.data;
  57.                         let Column={categories:[],series:[]};
  58.                         //这里我后台返回的是数组，所以用等于，如果您后台返回的是单条数据，需要push进去
  59.                         Column.categories=res.data.data.Column.categories;
  60.                         //这里的series数据是后台做好的，如果您的数据没有和前面我注释掉的格式一样，请自行拼接数据
  61.                         Column.series=res.data.data.Column.series;
  62.                         _self.showColumn("canvasColumn",Column);
  63.                     },
  64.                     fail: () => {
  65.                         console.log("网络错误，小程序端请检查合法域名");
  66.                     },
  67.                 });
  68.             },
  69.             showColumn(canvasId,chartData){
  70.                 canvaColumn=new uCharts({
  71.                     $this:_self,
  72.                     canvasId: canvasId,
  73.                     type: 'column',
  74.                     legend:true,
  75.                     fontSize:11,
  76.                     background:'#FFFFFF',
  77.                     pixelRatio:_self.pixelRatio,
  78.                     animation: true,
  79.                     categories: chartData.categories,
  80.                     series: chartData.series,
  81.                     xAxis: {
  82.                         disableGrid:true,
  83.                     },
  84.                     yAxis: {
  85.                     },
  86.                     dataLabel: true,
  87.                     width: _self.cWidth*_self.pixelRatio,
  88.                     height: _self.cHeight*_self.pixelRatio,
  89.                     extra: {
  90.                         column: {
  91.                           width: _self.cWidth*_self.pixelRatio*0.45/chartData.categories.length
  92.                         }
  93.                       }
  94.                 });
  95.             },
  96.             changeData(){
  97.                 canvaColumn.updateData({
  98.                     series: _self.serverData.ColumnB.series,
  99.                     categories: _self.serverData.ColumnB.categories
  100.                 });
  101.             }
  102.         }
  103.     }
  104. </script>
  106. <style>
  107. page{background:#F2F2F2;width: 750upx;overflow-x: hidden;}
  108. .qiun-padding{padding:2%; width:96%;}
  109. .qiun-wrap{display:flex; flex-wrap:wrap;}
  110. .qiun-rows{display:flex; flex-direction:row !important;}
  111. .qiun-columns{display:flex; flex-direction:column !important;}
  112. .qiun-common-mt{margin-top:10upx;}
  113. .qiun-bg-white{background:#FFFFFF;}
  114. .qiun-title-bar{width:96%; padding:10upx 2%; flex-wrap:nowrap;}
  115. .qiun-title-dot-light{border-left: 10upx solid #0ea391; padding-left: 10upx; font-size: 32upx;color: #000000}
  116. /* 通用样式 */
  117. .qiun-charts{width: 750upx; height:500upx;background-color: #FFFFFF;}
  118. .charts{width: 750upx; height:500upx;background-color: #FFFFFF;}
  119. </style>