How to check a file's existence in phone directory with phonegap

Question

I\'m writing an Android application with Phonegap 1.4.1 and Sencha that downloads and reads pdf files. How can I check whether the file exists in the phone directory using e

Answer 1

I took @Thomas Soti answer above and trimmed it down to a simple yes/no response.

function fileExists(fileName) {
  window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem){
      fileSystem.root.getFile(cordova.file.dataDirectory + fileName, { create: false }, function(){return true}, function(){return false});
  }, function(){return false}); //of requestFileSystem
}
// called as
if (fileExists("blah.json")) {
or
var fe = fileExists("blah.json) ;

Correction....this does NOT work. I am working on the fix now.