javascript - Writing files in Cordova/ionic doesn't work -

i'm writing app using cordova/ionic , i'm trying write files filesystem using $cordovafile plugin. try code docs (with added logging):

$cordovafile.writefile(cordova.file.datadirectory, "file.txt", "the text inside file", true)     .then(function (success) {         console.log('success: ' + json.stringify(success));     }, function (error) {         console.log('error: ' + json.stringify(error));     }); 

but returns error: {"code":5} in 5 refers encoding_err.

so after trying different combinations, changing first line (so without dir):

$cordovafile.writefile("file14.txt", "text", true) 

returns (formatted readability):

success: {     "type": "writeend",     "bubbles": false,     "cancelbubble": false,     "cancelable": false,     "lengthcomputable": false,     "loaded": 0,     "total": 0,     "target": "filename": "",     "length": 4,     "localurl": "cdvfile://localhost/persistent/file14.txt",     "position": 4,     "readystate": 2,     "result": null,     "error": null,     "onwritestart": null,     "onprogress": null,     "onwrite": null,     "onabort": null,     "onerror": null } 

so try reading out same file using:

$cordovafile.readastext("file14.txt")     .then(function (success) {         console.log('success: ' + json.stringify(success));     }, function (error) {         console.log('error: ' + json.stringify(error));     }); 

which surprise returns empty string: success: ""

so i'm wondering:

1. why copy-pasting example code lead 5 encoding_err?
2. why work when eliminate dir?
3. how can read out file i've created?

this tutorial easy follow , works on intel xdk uses cordova , work long have cordova ( has nothing intel xdk api ) , make sure cordova.file object defined in code .

please note there dramatic change in cordova file system starting ver 1.2 , please note current ver 1.3.3 have bugs regarding loading files current workspace ( www folder ) , writing , read files , application storage folder or internal storage dont have issues.

document.addeventlistener("deviceready", ondeviceready, false);          function ondeviceready()          {             requestfilesystem(localfilesystem.persistent, 0, onsuccess, onerror);         }          function onsuccess(filesystem)          {                var directoryentry = filesystem.root;              //lets create file named readme.txt. getfile method creates file , returns pointer(fileentry) if doesn't exist otherwise returns pointer it. returns file pointer callback parameter.             directoryentry.getfile("readme.txt", {create: true, exclusive: false}, function(fileentry){                 //lets write file                 fileentry.createwriter(function(writer){                     writer.write("this text inside readme file");                 }, function(error){                     console.log("error occurred while writing file. error code is: " + error.code);                 });             }, function(error){                 console.log("error occurred while getting pointer file. error code is: " + error.code);             });         }          function onerror(evt)         {             console.log("error occurred during request file system pointer. error code is: " + evt.code);         }