HTML5 FILE APIのテキストファイル読み込みサンプル

html5_fileapi.js

var onFileSelect = function(ev){
    var file = ev.target.files[0];
    var reader = new FileReader();
    reader.readAsText(file, 'UTF-8');

    reader.onload = function(ev){
      var i, l;
      var txt = ev.target.result;
      var lines = txt.split(/\r\n/);
      for( i = 0, l= lines.length; i < l; i++ ){
        console.log(lines[i]);
      }
    };
};

document.getElementById('files')
    .addEventListener('change', onFileSelect, false);