Selecting first item in the directory.

chrome/browser/resources/file_manager/js/file_manager.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Setting the src of an img to an empty string can crash the browser, so we
 // use an empty 1x1 gif instead.
 const EMPTY_IMAGE_URI = 'data:image/gif;base64,'
         + 'R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw%3D%3D';
 
 var g_slideshow_data = null;
@@ skipping 2491 matching lines @@
       return;
 
     this.metadataProvider_.fetch(entry.toURL(), function(metadata) {
       callback(metadata.description);
     });
   };
 
   FileManager.prototype.selectEntry = function(name) {
     for (var i = 0; i < this.dataModel_.length; i++) {
       if (this.dataModel_.item(i).name == name) {
-        this.currentList_.selectionModel.selectedIndex = i;
-        this.currentList_.scrollIndexIntoView(i);
-        this.currentList_.focus();
+        this.selectIndex(i);
         return;
       }
     }
   };
 
+  FileManager.prototype.selectIndex = function(index) {
+    this.currentList_.focus();
+    if (index >= this.dataModel_.length)
+      return;
+    this.currentList_.selectionModel.selectedIndex = index;
+    this.currentList_.scrollIndexIntoView(index);
+  };
+
   /**
    * Add the file/directory with given name to the current selection.
    *
    * @param {string} name The name of the entry to select.
    * @return {boolean} Whether entry exists.
    */
   FileManager.prototype.addItemToSelection = function(name) {
     var entryExists = false;
     for (var i = 0; i < this.dataModel_.length; i++) {
       if (this.dataModel_.item(i).name == name) {
@@ skipping 112 matching lines @@
       // with rewritable URLs (while does with history.pushState). It changes
       // window.location but doesn't change content of the ombibox.
       history.replaceState(undefined, dirEntry.fullPath, location);
     }
 
     if (this.currentDirEntry_ &&
         this.currentDirEntry_.fullPath == dirEntry.fullPath) {
       // Directory didn't actually change.
       if (opt_selectedEntry)
         this.selectEntry(opt_selectedEntry);
+      else
+        this.selectIndex(0);
       return;
     }
 
     var e = new cr.Event('directory-changed');
     e.previousDirEntry = this.currentDirEntry_;
     e.newDirEntry = dirEntry;
     e.saveHistory = opt_saveHistory;
     e.selectedEntry = opt_selectedEntry;
     e.opt_callback = opt_callback;
     this.currentDirEntry_ = dirEntry;
@@ skipping 397 matching lines @@
         function(result) {
           if (!result) {
             console.log('Failed to add file watch');
           }
       });
     }
 
     this.rescanDirectory_(function() {
         if (event.selectedEntry)
           self.selectEntry(event.selectedEntry);
+        else
+          self.selectIndex(0);
         if (event.opt_callback) {
           try {
             event.opt_callback();
           } catch (ex) {
             console.error('Caught exception while inovking callback: ', ex);
           }
         }
         // For tests that open the dialog to empty directories, everything
         // is loaded at this point.
         chrome.test.sendMessage('directory-change-complete');
@@ skipping 893 matching lines @@
           });
       }, onError);
 
       function onError(err) {
         console.log('Error while checking free space: ' + err);
         setTimeout(doCheck, 1000 * 60);
       }
     }
   }
 })();