How uniapp application implements electronic signature and contract management

UniApp is a front-end development framework that supports the simultaneous development of WeChat applets, H5, App and other platforms. It has strong advantages in cross-platform development. This article will introduce how to implement electronic signature and contract management functions in the UniApp application, and provide specific code examples.

1. Realization of electronic signature function
Electronic signature refers to signing by electronic handwriting or other electronic means instead of traditional paper signatures. In UniApp, we can use the HTML5 Canvas element to implement the electronic signature function. Here is a simple sample code:

1. Add a Canvas element and two buttons to the page:

Clear signature> ;
Save signature

2. Define related methods in the script of the page:

export default {
methods: {

clearSignature() {
  const ctx = uni.createCanvasContext('signatureCanvas', this);
  ctx.clearRect(0, 0, 300, 200);
},
saveSignature() {
  const ctx = uni.createCanvasContext('signatureCanvas', this);
  ctx.draw(false, () => {
    uni.canvasToTempFilePath({
      canvasId: 'signatureCanvas',
      success(res) {
        uni.saveImageToPhotosAlbum({
          filePath: res.tempFilePath,
          success() {
            uni.showToast({
              title: '签名保存成功',
              icon: 'success'
            });
          }
        });
      }
    }, this);
  });
}

}
}

3. In the above code, the clearSignature method is used to clear the signature , the saveSignature method is used to save the signature. Specific steps include:

   • Get the Canvas context object;
   • Clear the content on the Canvas;
   • Draw the Canvas content and convert it to a temporary file path;
   • Save the temporary file to the album and give a successful save prompt.

2. Implementation of contract management functions
Contract management functions can include contract viewing, signing, sending and other functions. In UniApp, we can use cloud development to implement contract storage and management. The following is a simple sample code:

1. Create a cloud database collection named Contract to store contract data (fields include contract title, contract content, signing status, etc.).
2. Create a page named contract in the pages directory, and define relevant methods in the script of the page:

export default {
methods: {

viewContract(contractId) {
  // 根据contractId查询合同详情
  uniCloud.database().collection('Contract').doc(contractId).get().then(res => {
    // 显示合同详情
    uni.showToast({
      title: '合同标题：' + res.data.title + '，合同内容：' + res.data.content,
      icon: 'none'
    });
  });
},
signContract(contractId) {
  // 更新合同的签署状态为已签署
  uniCloud.database().collection('Contract').doc(contractId).update({
    signStatus: '已签署'
  }).then(() => {
    uni.showToast({
      title: '合同签署成功',
      icon: 'success'
    });
  });
},
sendContract(contractId) {
  // 发送合同给对方
  // ...
}

}
}

3. In the above code, the viewContract method is used to view the contract details, the signContract method is used to sign the contract, and the sendContract method is used to send the contract.

The above is a simple sample code to implement electronic signature and contract management functions. In actual development, you can also expand and optimize functions according to specific needs. Hope these examples are helpful!

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