How to quote echart in uniapp

With the continuous development of mobile applications, more and more developers are beginning to hope to use visual charts to present data in mobile applications. ECharts is a very popular data visualization chart library, so many developers hope to reference ECharts in uniapp to implement data visualization functions. This article will introduce how to reference ECharts in uniapp.

1. Reference ECharts in uniapp

ECharts is a JavaScript-based data visualization library that supports various chart types, including line charts, bar charts, pie charts, etc. To reference ECharts in uniapp, you need to go through the following steps:

1. Install ECharts in uniapp

Open the terminal in the root directory of the uniapp project and run the following command:

npm install echarts --save

This command will install ECharts into the project's node_modules directory and add it to the project's package.json file.

2. Referencing ECharts in uniapp

To reference ECharts in uniapp, you need to import echarts in the page that needs to use ECharts. You can use the import statement in the script tag to import ECharts, as shown below:

<template>
  <view class="echarts">
    <ec-canvas id="mychart" canvas-id="mychart" :ec="ec"></ec-canvas>
  </view>
</template>

<script>
  import * as echarts from 'echarts';

  export default {
    data() {
      return {
        ec: {
          lazyLoad: true  // 延迟加载
        }
      };
    },
    onLoad() {
      this.initChart();
    },
    methods: {
      initChart() {
        this.$nextTick(() => {
          let ecComponent = this.selectComponent('#mychart');
          ecComponent.init((canvas, width, height, dpr) => {
            const chart = echarts.init(canvas, null, {
              width: width,
              height: height,
              devicePixelRatio: dpr
            });
            this.setOption(chart);
            return chart;
          });
        });
      },
      setOption(chart) {
        const option = {
          // chart options
        };
        chart.setOption(option);
      }
    }
  }
</script>

In this example, we imported ECharts into the page and used the ec-canvas component to draw the chart. We also define a setOption method for setting the parameters of the chart.

3. Using ECharts in uniapp

Using ECharts to draw charts requires some basic knowledge, including chart types, data formats, etc. This knowledge can be learned in the official ECharts documentation.

When using ECharts to draw a chart, we can first define the parameters of the chart in the setOption method, and then use the chart.setOption(option) method to apply the parameters to the chart, as shown below:

setOption(chart) {
  const option = {
    title: {
      text: '销售统计'
    },
    tooltip: {
      trigger: 'axis'
    },
    legend: {
      data: ['销量']
    },
    xAxis: {
      data: ['周一', '周二', '周三', '周四', '周五', '周六', '周日']
    },
    yAxis: {},
    series: [{
      name: '销量',
      type: 'bar',
      data: [5, 20, 36, 10, 10, 20, 10]
    }]
  };
  chart.setOption(option);
}

2. Summary

To reference ECharts in uniapp, you need to install ECharts in the project first, and import echarts into the page where ECharts needs to be used. Then, define the parameters of the chart in the setOption method, and use the chart.setOption(option) method to apply the parameters to the chart.

At the same time, the use of ECharts requires some basic knowledge, including chart types, data formats, etc. Developers need to study the official ECharts documentation carefully.

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