Tizen Forums

Thanks a lot for your reply GEUNSOO KIM ! I will try this.

Well, it looks like it doesn't work :( , I integrated this into my code : <script src="https://cdn.jsdelivr.net/npm/promise-polyfill@8/dist/polyfill.min.js"></script>
found here : https://github.com/taylorhakes/promise-polyfill

But still my code doesn't work:

var dataToReturn = "init";
function getDetail(detail){
var documentsDir;
var prom = new Promise(function(resolve,reject){
    tizen.filesystem.resolve("documents", function (dir) {
   documentsDir = dir;
            var file = documentsDir.resolve("myFile.json");
            file.openStream(
                 "r", 
                 function(fs) {
                     var text = fs.read(file.fileSize);       
                     fs.close();
                     var obj  = JSON.parse(text);
                     
                     switch (detail){
                      case "data1Value":
                      dataToReturn = obj.data1;
                      break;
                     
                      case "data2Value":
                      dataToReturn = obj.data2;
                      break;
                     
                      case "data3Value":
                      dataToReturn = obj.data3;
                      break;
                     
                      default:
                      dataToReturn = null;
                     }
alert(dataToReturn);    //    appears ranked 2
                 }, function (e) {
                     alert("Error " + e.message);
                 }, "UTF-8");
     });
    if(true){
     resolve(dataToReturn);
    }
    else{
     reject(new Error ("It broke"));
    }
});
prom.then(function(result){
alert(result + " outside");//    appears ranked 1
});
    
// return dataToReturn;
}

Hi ! Try to add this privilege :
    <tizen:privilege name="http://tizen.org/privilege/mediastorage"/>