How to get the number of files in uniapp

When developing using uniapp, we sometimes need to get the number of files in a certain folder to meet business needs. This article will introduce how uniapp gets the number of files.

1. Use the wx.getFileSystemManager() method to obtain the file system manager

uniapp can obtain the file system manager of the applet through the wx.getFileSystemManager() method. The manager can perform common operations such as reading, writing, saving, and deleting files.

2. Use the wx.getFileSystemManager().readdir() method to obtain the file list under the folder

Use the wx.getFileSystemManager().readdir() method to obtain a file list A list of files in a folder. This method needs to pass in two parameters: the folder path and the callback function. The parameters of the callback function include two fields: err and files, where err represents the error message and files represents the file list array.

The sample code is as follows:

wx.getFileSystemManager().readdir({
  dirPath: '/path/to/folder',
  success: function (res) {
    console.log(res.files.length);
  }
})

3. Count the number of files

After obtaining the file list, we can get the number of files through the length attribute of the array, code An example is as follows:

wx.getFileSystemManager().readdir({
  dirPath: '/path/to/folder',
  success: function (res) {
    console.log(res.files.length);
  }
})

The above three steps are how uniapp obtains the number of files. We can encapsulate this method according to business needs to facilitate subsequent use.

Summary

In uniapp, we can get the number of files through the wx.getFileSystemManager() method and wx.getFileSystemManager().readdir() method. In actual development, we can implement various operations and meet our business needs by calling these methods.

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