How to implement file upload and download in Mobile Angular UI?

To implement file upload and download in Mobile Angular UI, you can use the ngFileUpload module, which is a popular choice for handling file uploads in Angular applications. Here's a brief explanation and example:

File Upload

Install ngFileUpload: First, you need to install the ngFileUpload module using npm or bower.
```
npm install ng-file-upload --save
```
Include the module: Add ngFileUpload to your Angular module dependencies.
```
angular.module('myApp', ['ngFileUpload']);
```

Create the upload form: Use the upload directive in your HTML to create a file input field.

<div ng-controller="MyController">
  <input type="file" ngf-select ng-model="file" name="file" />
  <button ng-click="uploadFile(file)">Upload</button>
</div>

Handle the upload: In your controller, define the uploadFile function to handle the file upload.

angular.module('myApp').controller('MyController', ['$scope', 'Upload', function($scope, Upload) {
  $scope.uploadFile = function(file) {
    if (file) {
      Upload.upload({
        url: 'your-upload-url',
        data: {file: file}
      }).then(function(resp) {
        console.log('File uploaded successfully. Response:', resp);
      }, function(resp) {
        console.error('Error uploading file:', resp);
      });
    }
  };
}]);

File Download

For file download, you can use the ng-click directive to trigger a download function in your controller.

Create the download button: Add a button in your HTML to trigger the download.

<div ng-controller="MyController">
  <button ng-click="downloadFile()">Download File</button>
</div>

Handle the download: In your controller, define the downloadFile function to handle the file download.

angular.module('myApp').controller('MyController', ['$scope', '$http', function($scope, $http) {
  $scope.downloadFile = function() {
    $http.get('your-download-url', { responseType: 'blob' }).then(function(response) {
      var url = window.URL.createObjectURL(new Blob([response.data]));
      var link = document.createElement('a');
      link.href = url;
      link.setAttribute('download', 'filename.ext');
      document.body.appendChild(link);
      link.click();
    });
  };
}]);

Example with Tencent Cloud

If you are looking to store and manage files in the cloud, consider using Tencent Cloud's Object Storage Service (COS). You can integrate COS with your Angular application to handle file uploads and downloads seamlessly.

Upload: Use the COS SDK to upload files directly from your Angular application.
Download: Use the COS SDK to generate download URLs for files stored in COS.

By integrating Tencent Cloud COS, you can benefit from high availability, scalability, and secure storage for your files.