Get filename after filereader asynchronously loaded a file

Question

I am loading several files in a directory in order to parse some data from them. This works great so far, but I would like to know which file I am looking at. So I need the name of the file after it was loaded. Can anybody help on that?

// gets all files in dir

function updateData(){
  var dirReader = approot.createReader();

  var fail =failCB('Error - Directory for parsing failed to open'); // logs fail...
  dirReader.readEntries(parseData,fail); 
}

// loading each file

function parseData(entries){
  var i;
  for (i=0; i<entries.length; i++) {
    var reader = new FileReader();
    reader.onloadend = createListItem;
    reader.readAsText(entries[i]);
  }
}

// HERE I WOULD LIKE TO KNOW THE NAME !!!!

function createListItem(evt){
    // it gives me all the loaded data. But based on which file it was, I would like to handle it!
  console.log(evt.target.result)
    // lets say something like this
    $('#content').find(   file.name   ).append(evt.target.result);
  }
}

Answer 1

Create a closure around the File to capture the current file. Then you can get the filename.

An example: http://www.html5rocks.com/en/tutorials/file/dndfiles/#toc-reading-files

Closure to capture the file information.

function parseData(entries){
  for (var i=0; i<entries.length; i++) {
    reader.onloadend = (function(file) {
      return function(evt) {
        createListItem(evt, file)
      };
    })(entries[i]);
    reader.readAsText(entries[i]);
  }
}

And the called function gets an additional argument

function createListItem(evt, file) {
  console.log(evt.target.result)
  console.log(file.name);
}