Added method GetSelectedIndex

layout/forms/nsIListControlFrame.h

@@ -52,6 +52,12 @@ public:
    */
   NS_IMETHOD GetSelectedItem(nsString & aStr) = 0;
 
+  /**
+   * Get the Selected Item's index
+   *
+   */
+  NS_IMETHOD GetSelectedIndex(PRInt32* aIndex) = 0;
+
   /**
    * Initiates mouse capture for the listbox
    *

layout/html/forms/public/nsIListControlFrame.h

@@ -52,6 +52,12 @@ public:
    */
   NS_IMETHOD GetSelectedItem(nsString & aStr) = 0;
 
+  /**
+   * Get the Selected Item's index
+   *
+   */
+  NS_IMETHOD GetSelectedIndex(PRInt32* aIndex) = 0;
+
   /**
    * Initiates mouse capture for the listbox
    *