up and down keys for navigation

edgware/static/js/files/browse.js

@@ -80,6 +80,17 @@ $(function() {
     }, "json");
   });
 
+  $(document).keydown(function(e) {
+    var k = e.keyCode;
+    if (k==40) {
+      e.preventDefault();
+      moveListDown();
+    }
+    if (k==38) {
+      e.preventDefault();
+      moveListUp();
+    } 
+  });
 
   $(window).resize(function() {
     var minuser = 400;
@@ -179,3 +190,19 @@ function getSelectedIds() {
   });
   return ids;
 }
+
+function moveListDown() {
+  var currentIndex = $('.selectedItem').index(".fileItem");
+  if (currentIndex == $('.fileItem').length) {
+    return;
+  }
+  $('.fileItem').eq(currentIndex + 1).click();  
+}
+
+function moveListUp() {
+  var currentIndex = $('.selectedItem').index(".fileItem");
+  if (currentIndex == 0) {
+    return;
+  }
+  $('.fileItem').eq(currentIndex - 1).click();    
+}