Event: Remove an internal argument to the on method

(cherry-picked from 04a29696e5b176ac66401120e433d52425222f0f)

Refs gh-2301

src/event.js

@@ -32,6 +32,58 @@ function safeActiveElement() {
 	} catch ( err ) { }
 }
 
+function on( elem, types, selector, data, fn, one ) {
+	var type, origFn;
+
+	// Types can be a map of types/handlers
+	if ( typeof types === "object" ) {
+		// ( types-Object, selector, data )
+		if ( typeof selector !== "string" ) {
+			// ( types-Object, data )
+			data = data || selector;
+			selector = undefined;
+		}
+		for ( type in types ) {
+			on( elem, type, selector, data, types[ type ], one );
+		}
+		return elem;
+	}
+
+	if ( data == null && fn == null ) {
+		// ( types, fn )
+		fn = selector;
+		data = selector = undefined;
+	} else if ( fn == null ) {
+		if ( typeof selector === "string" ) {
+			// ( types, selector, fn )
+			fn = data;
+			data = undefined;
+		} else {
+			// ( types, data, fn )
+			fn = data;
+			data = selector;
+			selector = undefined;
+		}
+	}
+	if ( fn === false ) {
+		fn = returnFalse;
+	}
+
+	if ( one === 1 ) {
+		origFn = fn;
+		fn = function( event ) {
+			// Can use an empty set, since event contains the info
+			jQuery().off( event );
+			return origFn.apply( this, arguments );
+		};
+		// Use same guid so caller can remove using origFn
+		fn.guid = origFn.guid || ( origFn.guid = jQuery.guid++ );
+	}
+	return elem.each( function() {
+		jQuery.event.add( this, types, fn, data, selector );
+	});
+}
+
 /*
  * Helper functions for managing events -- not part of the public interface.
  * Props to Dean Edwards' addEvent library for many of the ideas.
@@ -985,59 +1037,11 @@ if ( !support.focusin ) {
 
 jQuery.fn.extend({
 
-	on: function( types, selector, data, fn, /*INTERNAL*/ one ) {
-		var type, origFn;
-
-		// Types can be a map of types/handlers
-		if ( typeof types === "object" ) {
-			// ( types-Object, selector, data )
-			if ( typeof selector !== "string" ) {
-				// ( types-Object, data )
-				data = data || selector;
-				selector = undefined;
-			}
-			for ( type in types ) {
-				this.on( type, selector, data, types[ type ], one );
-			}
-			return this;
-		}
-
-		if ( data == null && fn == null ) {
-			// ( types, fn )
-			fn = selector;
-			data = selector = undefined;
-		} else if ( fn == null ) {
-			if ( typeof selector === "string" ) {
-				// ( types, selector, fn )
-				fn = data;
-				data = undefined;
-			} else {
-				// ( types, data, fn )
-				fn = data;
-				data = selector;
-				selector = undefined;
-			}
-		}
-		if ( fn === false ) {
-			fn = returnFalse;
-		}
-
-		if ( one === 1 ) {
-			origFn = fn;
-			fn = function( event ) {
-				// Can use an empty set, since event contains the info
-				jQuery().off( event );
-				return origFn.apply( this, arguments );
-			};
-			// Use same guid so caller can remove using origFn
-			fn.guid = origFn.guid || ( origFn.guid = jQuery.guid++ );
-		}
-		return this.each( function() {
-			jQuery.event.add( this, types, fn, data, selector );
-		});
+	on: function( types, selector, data, fn ) {
+		return on( this, types, selector, data, fn );
 	},
 	one: function( types, selector, data, fn ) {
-		return this.on( types, selector, data, fn, 1 );
+		return on( this, types, selector, data, fn, 1 );
 	},
 	off: function( types, selector, fn ) {
 		var handleObj, type;