Let’s talk about the reasons and solutions for the failure to upload image parameters in uniapp

With the development of the mobile Internet, more and more applications have begun to adopt the "multi-terminal integration" model, and uniapp came into being in such an environment. It allows us to build native applets, H5, and APP applications at the same time in one code, and saves development costs. However, uniapp also has some problems worthy of our attention. For example, when uploading images, we may encounter the problem that parameters cannot be passed. Today, we will talk about the problem and solutions to the problem that the image parameters uploaded by uniapp cannot be passed in.

1. Problem Analysis

When uploading images in uniapp, we can use the uni.uploadFile() API to achieve this. In actual development, due to business needs, we often need to add some additional parameters when uploading images to perform other operations. However, when we uploaded the image, we found that these additional parameters could not be passed in. This is what we call the problem of parameters not being passed in.

2. Problem Solving

In fact, there are many reasons why parameters cannot be passed, but the most common one is that we do not correctly handle the data type of parameters. In most cases, when we transfer parameters, we pass them in the form of strings. In uniapp, the parameter format required when uploading images is not a string, but a JSON object. So, to solve this problem, the first thing we need to do is convert these strings into JSON objects.

The following is a sample code for reference:

let param = {
  filePath: filePath,
  name: 'file',
  formData: {
    'token': 'your_token',
    'name': 'your_name'
  },
  success: function (res) {
    console.log('上传成功', res);
  },
  fail: function (res) {
    console.log('上传失败', res);
  }
};
uni.uploadFile(param);

In this code, we can see that the parameters under formData are passed in the form of JSON objects. If you want to pass a string parameter, you need to convert it into a JSON object, as shown below:

let jsonString = '{ "token": "your_token", "name": "your_name" }';
let formData = JSON.parse(jsonString);

In this way, we can solve the problem of being unable to upload images by converting the string into a JSON object. There is a problem with passing parameters.

3. Summary

In uniapp, uploading pictures is a frequently used function. When uploading images, due to parameter passing problems, it may not be possible to pass them in. In order to solve this problem, we need to convert the string parameters into JSON objects to meet the requirements of parameter passing. I believe that through this article, you have understood the problem and solution of parameters not being passed in.

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