Retrieving Files and File Details

Learning how to get files and file details from the file system is a basic data management skill:

1. To access a specific file or directory within the file system, retrieve a file handle using the resolve() method of the FileSystemManager interface:

   webapis.filesystem.resolve('documents', onResolveSuccess, onResolveError, 'r');

   The File object is returned in the success event handler.

2. To retrieve a list of all the files and their directories located in a specified directory, use the listFiles() method of the File object:

   function onResolveSuccess(dir)
   {  
      dir.listFiles(onsuccess, onerror);
   }

   The method returns an array of File objects.

3. To retrieve the file URI, use the toURI() method:

   function onsuccess(files) 
   { 
      for (var i = 0; i < files.length; i++) 
      {
         /* Display the file name and URL */
         console.log("File name is " + files[i].name + "and URL is " + files[i].toURI());

4. To retrieve the file content as a DOMString, use the readAsText() method.

   The encoding input parameter of the method defines the format in which the file content is returned.

         if (files[i].isDirectory == false) 
            files[i].readAsText(function(str) {console.log("File content: " + str);}, "UTF-8");
      }
   }