purdrew/file_cr_rm.html

## file_cr_rm.html
<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <meta name="viewport" id="viewport" content="width=device-width,height=device-height,initial-scale=1.0,user-scalable=no">
    <script src="json2.js" type="text/javascript"></script>
    <script src="phonegap.js" type="text/javascript"></script>
    <script type="text/javascript">

        // invoked when device is ready
        function deviceInfo() {
            document.getElementById('window.device.phonegap').innerHTML = 'window.device.phonegap = ' + window.device.phonegap;
        }

        // register PhoneGap event listeners when DOM content loaded
        function init() {
            console.log('init()');
            document.addEventListener("deviceready", deviceInfo, true);
        }

        // retrieves root file system entry
        var getFileSystemRoot = (function() {

            // private
            var root;

            // one-time retrieval of the root file system entry
            var init = function() {
                window.requestFileSystem(LocalFileSystem.PERSISTENT, 0,
                    function(fileSystem) {
                        root = fileSystem.root;
                    },
                    onFileSystemError);
            };
            document.addEventListener("deviceready", init, true);

            // public function returns private root entry
            return function() {
                return root;
            };
        }()); // execute immediately

        // file system error handler
        function onFileSystemError(error) {
            var msg = 'file system error: ' + error.code;
            navigator.notification.alert(msg, null, 'File System Error');
        }

        // logs file events
        function onFileEvent(event) {
            console.log('file event: ' + event.target.fileName + ' ' + event.type);
        }

        // called when error reading file
        function onFileError(event) {
            console.log('file error: ' + event.target.error.code);
        }

        // called when file is written
        function onFileWrite(event) {
            onFileEvent(event);
            console.log('FileWriter position=' +
                event.target.position + ", length=" + event.target.length);
        }

        // writes a text file to the device
        function writeFile() {
                // root file system entry
            var root = getFileSystemRoot(),

                // writes a file
                write_file = function(writer) {
                    var lineCount = 1;

                    // set the callbacks
                    writer.onwritestart = onFileEvent;
                    writer.onprogress = onFileEvent;
                    writer.onwrite = onFileWrite;
                    writer.onabort = onFileEvent;
                    writer.onerror = onFileError;
                    writer.onwriteend = function(event) {
                        onFileEvent(event);
                        lineCount += 1;
                        if (lineCount <= 3) {
                            // append a new line
                            writer.write('Line ' + lineCount + '.\r\n');
                        }
                        else {
                            alert(writer.fileName +
                                ' length=' + writer.length +
                                ', position=' + writer.position);
                        }
                    }

                    // append
                    writer.seek(writer.length);

                    // write to file
                    writer.write('Line ' + lineCount + '.\r\n');
                },

                // creates a FileWriter object
                create_writer = function(fileEntry) {
                    fileEntry.createWriter(write_file, onFileSystemError);
                };

            // create a file and write to it
            root.getFile('bbgap.txt', {create: true}, create_writer, onFileSystemError);
        }

        // remove file system entry
        function removeFile() {
            var root = getFileSystemRoot();
            var remove_file = function(entry) {
                entry.remove(function() {
                    navigator.notification.alert(entry.toURI(), null, 'Entry deleted');
                }, onFileSystemError);
            };

            // retrieve a file and truncate it
            root.getFile('bbgap.txt', {create: false}, remove_file, onFileSystemError);
        }

    </script>
    <title>File Create/Remove</title>
  </head>
  <body onload="init()">

    <h3>window.device</h3>
    <p id="window.device.phonegap">[window.device.phonegap]</p>

    <input type="button" value="Write File" onclick="writeFile();return false;" />
    <input type="button" value="Remove File" onclick="removeFile();return false;" />

  </body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	<meta name="viewport" id="viewport" content="width=device-width,height=device-height,initial-scale=1.0,user-scalable=no">
	<script src="json2.js" type="text/javascript"></script>
	<script src="phonegap.js" type="text/javascript"></script>
	<script type="text/javascript">

	// invoked when device is ready
	function deviceInfo() {
	document.getElementById('window.device.phonegap').innerHTML = 'window.device.phonegap = ' + window.device.phonegap;
	}

	// register PhoneGap event listeners when DOM content loaded
	function init() {
	console.log('init()');
	document.addEventListener("deviceready", deviceInfo, true);
	}

	// retrieves root file system entry
	var getFileSystemRoot = (function() {

	// private
	var root;

	// one-time retrieval of the root file system entry
	var init = function() {
	window.requestFileSystem(LocalFileSystem.PERSISTENT, 0,
	function(fileSystem) {
	root = fileSystem.root;
	},
	onFileSystemError);
	};
	document.addEventListener("deviceready", init, true);

	// public function returns private root entry
	return function() {
	return root;
	};
	}()); // execute immediately

	// file system error handler
	function onFileSystemError(error) {
	var msg = 'file system error: ' + error.code;
	navigator.notification.alert(msg, null, 'File System Error');
	}

	// logs file events
	function onFileEvent(event) {
	console.log('file event: ' + event.target.fileName + ' ' + event.type);
	}

	// called when error reading file
	function onFileError(event) {
	console.log('file error: ' + event.target.error.code);
	}

	// called when file is written
	function onFileWrite(event) {
	onFileEvent(event);
	console.log('FileWriter position=' +
	event.target.position + ", length=" + event.target.length);
	}

	// writes a text file to the device
	function writeFile() {
	// root file system entry
	var root = getFileSystemRoot(),

	// writes a file
	write_file = function(writer) {
	var lineCount = 1;

	// set the callbacks
	writer.onwritestart = onFileEvent;
	writer.onprogress = onFileEvent;
	writer.onwrite = onFileWrite;
	writer.onabort = onFileEvent;
	writer.onerror = onFileError;
	writer.onwriteend = function(event) {
	onFileEvent(event);
	lineCount += 1;
	if (lineCount <= 3) {
	// append a new line
	writer.write('Line ' + lineCount + '.\r\n');
	}
	else {
	alert(writer.fileName +
	' length=' + writer.length +
	', position=' + writer.position);
	}
	}

	// append
	writer.seek(writer.length);

	// write to file
	writer.write('Line ' + lineCount + '.\r\n');
	},

	// creates a FileWriter object
	create_writer = function(fileEntry) {
	fileEntry.createWriter(write_file, onFileSystemError);
	};

	// create a file and write to it
	root.getFile('bbgap.txt', {create: true}, create_writer, onFileSystemError);
	}

	// remove file system entry
	function removeFile() {
	var root = getFileSystemRoot();
	var remove_file = function(entry) {
	entry.remove(function() {
	navigator.notification.alert(entry.toURI(), null, 'Entry deleted');
	}, onFileSystemError);
	};

	// retrieve a file and truncate it
	root.getFile('bbgap.txt', {create: false}, remove_file, onFileSystemError);
	}

	</script>
	<title>File Create/Remove</title>
	</head>
	<body onload="init()">

	<h3>window.device</h3>
	<p id="window.device.phonegap">[window.device.phonegap]</p>

	<input type="button" value="Write File" onclick="writeFile();return false;" />
	<input type="button" value="Remove File" onclick="removeFile();return false;" />

	</body>
	</html>