Use WeChat applet to realize QR code generation function

Use WeChat applet to realize QR code generation function

The popularity of applet allows developers to easily implement various functions, and the QR code generation function is is one of them. As a way to quickly transmit information, QR codes are widely used in various scenarios, such as payment, event promotion, etc. In this article, we will learn how to use WeChat applet to realize the function of QR code generation and provide specific code examples.

The first step is to create a project

First, we need to create a new mini program project in the WeChat developer tools. After entering the WeChat developer tools, select New Project and fill in basic information such as project name, project directory, and AppID. Then, select the mini program template and click Confirm to create the project.

The second step is to lay out the page

After the project is successfully created, we need to lay out the page. In the mini program page, you can use WXML language to write the page structure and WXSS language to write the page style.

First, open the pages/index/index.wxml file and write the following code:

<view class="container">
  <view class="title">二维码生成器</view>
  <image class="qrcode" src="{{qrcodeImage}}"></image>
  <button bindtap="generateQRCode">生成二维码</button>
</view>

Then, open pages/index/index.wxssFile, write the following code:

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 100px;
}

.title {
  font-size: 24px;
  margin-bottom: 20px;
}

.qrcode {
  width: 300px;
  height: 300px;
}

The above code defines the basic layout of the page, including a title, a picture showing the QR code and a button for generating the QR code.

The third step is to write the logic code

Next, we need to write the logic code of the page, including the function of generating QR codes.

First, open the pages/index/index.js file and write the following code:

Page({
  data: {
    qrcodeImage: ''
  },
  generateQRCode() {
    wx.navigateTo({
      url: '/pages/qrcode/qrcode'
    })
  }
})

The above code defines a generateQRCode method. When When you click the button, you will jump to the QR code generation page.

Then, create the pages/qrcode/qrcode.js file and write the following code:

Page({
  data: {
    qrcodeImage: ''
  },
  onLoad(options) {
    this.generateQRCode()
  },
  generateQRCode() {
    const qrcodeUrl = 'https://www.example.com' // 将此处替换为实际的二维码内容
    const qrcodeSize = 300

    wx.request({
      url: 'https://api.example.com/qrcode',
      method: 'POST',
      data: {
        url: qrcodeUrl,
        size: qrcodeSize
      },
      success: (res) => {
        this.setData({
          qrcodeImage: res.data.qrcodeImage
        })
      },
      fail: (err) => {
        console.error(err)
      }
    })
  }
})

The above code defines a generateQRCode method, Used to generate QR codes. In this method, we use wx.request to initiate a POST request, taking the content and size of the QR code as parameters. After successfully obtaining the QR code image, we use the setData method to update the page data and display the QR code image on the page.

Step 4, run and test

After all the code is written, we can click the run button on the WeChat developer tools to preview our mini program. When you click the "Generate QR Code" button, you will jump to the QR code generation page and generate a QR code image.

Summary

Through the above steps, we successfully used the WeChat applet to implement the QR code generation function. By calling the API provided by WeChat, we can easily implement various functions and make the user interface more friendly and beautiful through page layout and style. I hope the code examples provided in this article can help you realize your QR code generation needs.

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