Create text file inside a folder?

function gotFS(fileSystem) {
                fileSystem.root.getFile("readme.txt", {create: true}, gotFileEntry, fail);
            }

            function gotFileEntry(fileEntry) {
                fileEntry.createWriter(gotFileWriter, fail);
            }

            function gotFileWriter(writer) {
                writer.onwrite = function(evt) {
                    console.log("write success");
                };

                writer.write("some sample text");
                writer.abort();
                // contents of file now 'some different text'
            }


function onFileSystemSuccess(fileSystem) {
          console.log(fileSystem.name);
          var directoryEntry = fileSystem.root;
          
          directoryEntry.getDirectory($('.caseName_h').val(), {create: true, exclusive: false}, onDirectorySuccess, onDirectoryFail)

      }
      
      function onDirectorySuccess(parent) {
          console.log(parent);
      }

      function onDirectoryFail(error) {
          alert("Unable to create new directory: " + error.code);
      }

      function onFileSystemFail(evt) {
          console.log(evt.target.error.code);
      }