Cordova File API Example Usage

file-helper.js

// Request Directory
function getDirectory(dirName /*this can be directory path also*/) {
	window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem){
		// Success Function Callback
		fileSystem.root.getDirectory(dirName, {}, function(directory) {
			// Success Function Callback
			console.log(directory, 'directory');
		}, function(error){
			//Error CallBack - getDirectory
			console.log(error,"Directory Lookup Error ");
		});
	}, function(error){
		// Error Callback - requestFileSystem
		// on Android this will print only Error as cordove / android limitations
		console.log("Error : ", error); 
	});  
}

// Request File
function getFile(fileName /*this needs be directory path relative to File System root directory*/) {
	window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem){
		// Success Function Callback
		fileSystem.root.getFile(fileName, {}, function(file) {
			// Success Function Callback
			console.log(file, 'file');
		}, function(error){
			//Error CallBack - getDirectory
			console.log(error,"Directory Lookup Error ");
		});
	}, function(error){
		// Error Callback - requestFileSystem
		// on Android this will print only Error as cordove / android limitations
		console.log("Error : ", error); 
	});  
}

// Get FileEntryObject - Dirty Way
function getFileEntry(fileName, parentDirectory /* e.g. Download/ */){
	var entry = new FileEntry(fileName);
	entry.fullPath = "//"+ parentDirectory + fileName;
	entry.nativeURL = fileSystem.root.toURL() + parentDirectory + fileName;
	entry.filesystem = new FileSystem('persistent');
	return entry;
}

// Get DirectoryEntryObject - Dirty Way
function getDirectoryEntry(dirName, parentDirectory /* e.g. Download/ */){
	var entry = new DirectoryEntry(dirName);
	entry.fullPath = "//"+ parentDirectory + dirName;
	entry.nativeURL = fileSystem.root.toURL() + parentDirectory + dirName;
	entry.filesystem = new FileSystem('persistent');
	return entry;
}