Cordova files Read and write JavaScript

The following code may help you to use the Cordova file plug-in function, you understand it, oh, say, this is the front-end HTML JavaScript method, non-Java plug-ins

Prerequisite: Configure Cordova Plug-in method, still not on their own niang.

Cordova Plugin Add PHONEGAP-NFC
Cordova plugin add cordova-plugin-device Cordova plugin
Add Cordova-plugin-file
Cordova Plugin Add cordova-plugin-camera
Cordova plugin add cordova-plugin-file-transfer Cordova plugin
Add Cordova-plugin-media
Cordova plugin add cordova-plugin-media-capture
Cordova plugin Add Org.apache.cordova.device-orientation  

var writedirectory; Default directory var Writefilename; Default file name var dataobj = null;
	Datas need write function Getsdcardfile (rootdirentry, directory, fileName) {this.writedirectory = directory;
	This.writefilename = FileName;
	Console.log (' File system open: ' + rootdirentry);

Window.resolvelocalfilesystemurl (Rootdirentry, Getfs, Onerrorgetdir);
		The function Getfs (sdcard) {if (SDcard = null) {Console.log ("No sdcard");
	Return
	else {direntry = CreateDirectory (SDcard, Writedirectory, writefilename); } function CreateDirectory (rootdirentry, directory, fileName) {return rootdirentry.getdirectory (directory, {Create
			: true}, Function (Direntry) {if (direntry = = null) {Console.log ("No direntry");
		Return
		else {fileentry = CreateFile (Direntry, FileName, false);
}}, Onerrorgetdir);
	function CreateFile (direntry, FileName, isappend) {//Creates a new file or returns the file if it already exists. Return Direntry.getfile (FilenaMe, {create:true, exclusive:false}, function (Fileentry) {if (fileentry = = null) {Console.log ("No fileent
			Ry ");
		Return
			
		else {writefileintenalcreatefile (fileentry, NULL, isappend);

}}, Onerrorcreatefile);
	
	function WriteFile (filePath, data) {dataobj=data;
Window.resolvelocalfilesystemurl (FilePath, Writemain, Onfilesystemfail);
		The function Writemain (fileentry) {if (fileentry = null) {Console.log ("No writemain fileentry");
	Return
		else {var isappend = false;
	Writefileintenalwritefile (Fileentry, Dataobj, isappend); } function Writefileintenalcreatefile (Fileentry, Dataobj, isappend) {//Create a FileWriter object for our Fileentry
	(Log.txt). Console.log (' File system open to write data: ' + dataobj); Fileentry.createwriter (function (fileWriter) {filewriter.onwriteend = function () {Console.log ("successful file writ
			E. ... ");
		Createfilecomplete ();

		}; Filewriter.onerror = function (e) {console.log ("Failed file R")EAD: "+ e.tostring ());

		};
		If we are appending data to file, go to the end of the file.
			if (isappend) {try {filewriter.seek (filewriter.length);
			catch (E) {console.log ("file doesn ' t exist!");
	} filewriter.write (Dataobj);
}); function Writefileintenalwritefile (fileentry, Dataobj, isappend) {//Create a FileWriter object for our fileentry (log
	. txt).
	Console.log (' File system open to write data: ' + dataobj '); Fileentry.createwriter (function (fileWriter) {filewriter.onwriteend = function () {Console.log ("successful file writ
			E. ... ");
		Writefilecomplete ();

		};
		Filewriter.onerror = function (e) {console.log ("Failed file read:" + e.tostring ());

		};
		If we are appending data to file, go to the end of the file.
			if (isappend) {try {filewriter.seek (filewriter.length);
			catch (E) {console.log ("file doesn ' t exist!");
	} filewriter.write (Dataobj);
}); The function Onfilesystemfail (error) {Console.log ("FailEd to get File: "+ Error.code);}

function Onerrorcreatefile (Error) {Console.log ("Failed to CreateFile:" + Error.code);}
 function Onerrorgetdir (Error) {Console.log ("Failed to Getdir:" + Error.code);}

var datas=null;//datas need write var directory= "MOBOVIP";//default directory var filename= "stores.txt";//default file
	Name function Write (data,directory,filename) {this.datas=data;
	This.directory=directory;
	This.filename=filename;
Window.requestfilesystem (localfilesystem.persistent, 0, onfilesystemsuccess, onfilesystemfail); //Get the MOBOVIP directory, and if not, create the directory function onfilesystemsuccess (filesystem) {newFile = FileSystem.root.getDirectory (
Directory, {create:true, exclusive:false}, Ondirectorysuccess, Onfilesystemfail);  //Get the Stores.txt file under the MOBOVIP directory, and create this file function Ondirectorysuccess (newFile) {newfile.getfile if not present (FileName, {create:
True, Exclusive:false}, Onfilesuccess, Onfilesystemfail); /** * Gets FileWriter object for writing data * @param fileentry/function onfilesuccess (fileentry) {Fileentry.createwriter (Onfilew
Ritersuccess, Onfilesystemfail); /** * Write Datas * @param writer/function onfilewritersuccess (writer) {//log ("Filename=" +writer.filename+); filElength= "+writer.length+";p osition= "+writer.position);
	Writer.onwrite = function (e) {//callback function Console.log ("write success") called after successful completion of the write;
	};
	Writer.onerror = function (e) {//callback functions called after write failure Console.log ("Write error" + Error.code);
	};
	Writer.onabort = function (e) {//write callback functions invoked after being aborted, for example by calling abort () console.log ("Write abort" + Error.code);
	}; 
	Quickly point the file pointer to the end of the file, which can be append//Writer.seek (writer.length); Writer.write (datas)///write data to File//writer.truncate (11);//Truncate File//Writer.abort () by specified length;/Abort Write file} function

 Onfilesystemfail (Error) {Console.log ("Failed to retrieve file:" + Error.code);}

var directory; Default directory
var fileName;//default file name
var jsonstring;
function Readfile (filePath) {
	console.log ("read file" +filepath);
	this.directory = Directory;
	This.filename = FileName;
	Window.resolvelocalfilesystemurl (FilePath, Readfilemain, fail);
	Window.resolvelocalfilesystemurl (cordova.file.externalRootDirectory + FilePath, readfilemain, fail);

function fail (e) {
	setjsonstring (null);
	Console.log ("filesystem Error");
	Console.log (E.code);
}

function Readfilemain (fileentry) {
	console.log ("read file start");
	Fileentry.file (function (file) {
		var reader = new FileReader ();
		Reader.onloadend = function () {
			Console.log ("read successfully");
			$ ("#state"). Text (this.result);
			Setjsonstring (This.result);
		};
		Reader.readastext (file);
	}, fail);

To have a function setjsonstring (STR) to accept read files on the main page