144     ui.board.handleEdit = function(tdDom, i, j) {

   145       if (!tdDom.firstChild || tdDom.firstChild.nodeType === Node.TEXT_NODE) {

   146         if (tdDom.firstChild)

   147           tdDom.removeChild(tdDom.firstChild);

   148         var inputDom = document.createElement('input');

   149         inputDom.value = board.current[i][j];

   150         inputDom.style.width = '1em';

   151         tdDom.appendChild(inputDom);

   152         inputDom.focus();

   153         inputDom.select();

   154         inputDom.addEventListener("blur", function(tdDom, i, j) {

   155           return function(event) {

   156             ui.board.handleEdit(tdDom, i, j);

   157             return false;

   158           }

   159         }(tdDom, i, j));

   160       } else {

   161         var inputDom = tdDom.firstChild;

   162         var val = parseInt(inputDom.value);

   163         if (0 <= val && val < 15) {

   164           board.current[i][j] = val;

   165           ui.board.set(i, j, val);

   166         } else {

   167           ui.board.set(i, j, board.current[i][j]);

   168         }

   169       }

   170     }

   171     ui.board.enableEdit = function() {

   172       var trDoms = boardDom.querySelectorAll("tr");

   173       for (var i = 0; i < 4; i++) {

   174         var tdDoms = trDoms[i].querySelectorAll("td");

   175         for (var j = 0; j < 4; j++) {

   176           var tdDom = tdDoms[j];

   177           tdDom.addEventListener("click", function(tdDom, i, j) {

   178             return function(event) {

   179               ui.board.handleEdit(tdDom, i, j);

   180               return false;

   181             }

   182           }(tdDom, i, j));

   183           tdDom.addEventListener("keyup", function(tdDom, i, j) {

   184             return function(event) {

   185               if (event.keyCode === 13)

   186                 ui.board.handleEdit(tdDom, i, j);

   187             }

   188           }(tdDom, i, j));

   189         }

   190       }

   191     }

   192     ui.board.enableEdit();

   193