How to implement chart display function in uniapp

How to implement chart display function in uniapp

In mobile application development, chart display is a common requirement. Through chart display, data can be presented intuitively, allowing users to better understand and analyze the data. In uniapp, we can use some plug-ins or libraries to realize the chart display function.

This article will introduce how to implement the chart display function in uniapp and provide corresponding code examples.

1. Use the ECharts plug-in

ECharts is an open source visual chart library that provides a wealth of chart types and interactive functions. Using the ECharts plug-in in uniapp, you can display and operate various charts.

1. In the package.json file in the project root directory, install the ECharts plug-in.

"dependencies": {
  "echarts": "^4.9.0"
}

2. Introduce the ECharts plug-in to pages that need to use charts.

import * as echarts from '@/components/ec-canvas/echarts';

3. Create a container and initialize and destroy the chart in the life cycle hook function.

<view class="chart-container">
  <ec-canvas id="chart" @init="initChart" @dispose="disposeChart"></ec-canvas>
</view>

export default {
  data() {
    return {
      chart: null
    };
  },
  methods: {
    initChart(e) {
      const { width, height } = e.detail;
      this.chart = echarts.init(e.detail.canvas, null, {
        width: width,
        height: height
      });
      this.chart.setOption({
        // 图表配置
      });
    },
    disposeChart() {
      if (this.chart) {
        this.chart.dispose();
        this.chart = null;
      }
    }
  }
}

In this way, a chart can be displayed on the page. By setting the option attribute of chart, you can configure the style, data, etc. of the chart.

2. Use uCharts plug-in

uCharts is a WeChat applet chart plug-in based on uniapp, which can easily display various charts in uniapp.

1. In the package.json file in the project root directory, install the uCharts plug-in.

"dependencies": {
  "u-charts": "^2.0.39"
}

2. Introduce the uCharts plug-in to pages that need to use charts.

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

3. Create a container and initialize and destroy the chart in the life cycle hook function.

<view class="chart-container">
  <u-charts :canvas-id="'chart'" :opts="chartOptions"></u-charts>
</view>

export default {
  data() {
    return {
      chartOptions: {}
    };
  },
  onReady() {
    const ctx = uni.createCanvasContext('chart', this); 
    this.chartOptions = {
      $this: this,
      canvasId: 'chart',
      type: 'line',
      categories: ['一月', '二月', '三月', '四月', '五月'],
      series: [{
        name: '销量',
        data: [150, 200, 300, 180, 250]
      }]
    };
    new uCharts().init(this.chartOptions);
  },
  detached() {
    new uCharts().destroy(this.chartOptions);
  }
}

In this way, a simple line chart is realized. By setting the properties of the chartOptions object, you can configure the chart type, data, etc.

Summary

The above are two commonly used methods to implement the chart display function in uniapp, using ECharts and uCharts plug-ins respectively. Through these plug-ins, we can easily display various charts in uniapp to achieve visual display of data.

I hope this article will help you understand how to implement the chart display function in uniapp.

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