To list all the existing albums in the bucket, the application's listAlbums function calls the listObjects method of the AWS. S3 service object while using commonPrefix so the call returns only objects used as albums.
The rest of the function takes the list of albums from the Amazon S3 bucket and generates the HTML needed to display the album list in the web page.
It also enables deleting and opening individual albums. The function then forms an Amazon S3 object key, passing it to the headObject method of the Amazon S3 service object.
This method returns the metadata for the specified key, so if it returns data, then an object with that key already exists. If the album doesn't already exist, the function calls the putObject method of the AWS. S3 service object to create the album. It then calls the viewAlbum function to display the new empty album.
The function then calls the listObjects method of the AWS. S3 service object to obtain a list of all the objects photos in the album. The rest of the function takes the list of objects photos from the album and generates the HTML needed to display the photos in the web page.
It also enables deleting individual photos and navigating back to the album list. It then forms a key for the photo to upload from the current album name and the file name. The function calls the upload method of the Amazon S3 service object to upload the photo. The ACL parameter is set to public-read so the application can fetch the photos in an album for display by their URL in the bucket.
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The write() method is mostly used for testing: If it is used after an HTML document is fully loaded, it will delete all existing HTML. Note: When this method is not used for testing, it is often used to write some text to.