Vue and ECharts4Taro3 practical case: create unique data visualization reports

Vue and ECharts4Taro3 Practical Case: Creating a Unique Data Visualization Report

In recent years, data visualization has become an indispensable part of data analysis and decision-making. In the field of front-end development, Vue and ECharts4Taro3 are two very popular tools. This article will combine these two tools and share a practical case to help readers understand how to use them to create unique data visualization reports.

1. Preparation

First, we need to install Vue and Taro. Install through the following command:

npm install -g @vue/cli
npm install -g @tarojs/cli

At the same time, you also need to install ECharts4Taro3, execute the following command:

npm install echarts-for-taro@3

2. Create project

After the preparations are completed , we can start creating a project based on Vue and Taro. Execute the following command:

vue create data-visualization

Select the default preset. After creation, enter the project directory:

cd data-visualization

Then use the following command to install Taro’s Vue adapter:

vue add taro

Next, execute the following command to create a data visualization page:

taro create -n visualization

During the creation process, select Vue as the framework. After completion, enter the page directory:

cd src/pages/visualization

3. Write code

In the directory of the visualization page, we can see a file named visualization.vue. Open it and we can start writing code for data visualization.

First, introduce the required components and styles:

import Taro, { useEffect, useState } from '@tarojs/taro';
import { View } from '@tarojs/components';
import echarts from 'echarts';
import 'echarts-for-taro3';
import './visualization.scss';

Then, in Vue’s life cycle hook function, initialize the state of ECharts and data:

export default function Visualization() {
  const [chart, setChart] = useState(null);
  const [data, setData] = useState([]);

  useEffect(() => {
    initChart();
    fetchData();
  }, []);

  const initChart = () => {
    const ctx = Taro.createCanvasContext('chart');
    setChart(echarts.init(ctx));
  };

  const fetchData = () => {
    // TODO: 获取数据的逻辑
  };

Next , we need to get the data in the fetchData function and assign it to the data state:

const fetchData = async () => {
  try {
    const response = await Taro.request({
      url: 'https://api.example.com/data', // 修改为实际的数据接口
      method: 'GET',
    });
  
    setData(response.data);
  } catch (error) {
    console.error(error);
  }
};

Finally, we can render the data visualization area in the template:

4. Create a unique Data Visualization Report

In the above code example, we have completed the basic framework of data visualization. Next, we can use ECharts' API to customize unique data visualization effects based on specific data needs.

In the fetchData function, we can organize and process the data based on the data returned by the interface. Then, use the API of ECharts to draw the chart:

const fetchData = async () => {
  try {
    const response = await Taro.request({
      url: 'https://api.example.com/data', // 修改为实际的数据接口
      method: 'GET',
    });
  
    const data = response.data;
  
    const option = {
      xAxis: {
        type: 'category',
        data: data.map(item => item.name),
      },
      yAxis: {
        type: 'value',
      },
      series: [{
        data: data.map(item => item.value),
        type: 'bar',
      }],
    };
  
    chart.setOption(option);
  } catch (error) {
    console.error(error);
  }
};

Through the above code, we use the histogram of ECharts to display the data. You can choose the appropriate chart type according to your specific needs, and customize the style and interaction of the chart by configuring options.

5. Run the project

Finally, execute the following command to run the project:

npm run dev:rn

After the operation is successful, you can install the development version of Taro client Use the terminal App to preview the data visualization report:

npm install -g @tarojs/cli@latest
taro build --weapp
taro build --rn

Summary:

This article introduces how to create a unique data visualization report through Vue and ECharts4Taro3. We use Taro to develop cross-platform applications and combine it with ECharts to achieve visual display of data. We hope that readers can gain an in-depth understanding of the principles and applications of data visualization through this practical case, and further improve their front-end development capabilities.

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