public/ckeditor/4.4dev/plugins/filebrowser/plugin.js
function uploadFile( evt ) {
		var dialog = this.getDialog();
		var editor = dialog.getParentEditor();

		editor._.filebrowserSe = this;

		// If user didn't select the file, stop the upload.
		if ( !dialog.getContentElement( this[ 'for' ][ 0 ], this[ 'for' ][ 1 ] ).getInputElement().$.value )
			return false;

		if ( !dialog.getContentElement( this[ 'for' ][ 0 ], this[ 'for' ][ 1 ] ).getAction() )
			return false;

		return true;
	}
function uploadFile( evt ) {
		var dialog = this.getDialog();
		var editor = dialog.getParentEditor();

		editor._.filebrowserSe = this;

		// If user didn't select the file, stop the upload.
		if ( !dialog.getContentElement( this[ 'for' ][ 0 ], this[ 'for' ][ 1 ] ).getInputElement().$.value )
			return false;

		if ( !dialog.getContentElement( this[ 'for' ][ 0 ], this[ 'for' ][ 1 ] ).getAction() )
			return false;

		return true;
	}
function uploadFile ( evt ) { var dialog = this . getDialog ( ) ; var editor = dialog . getParentEditor ( ) ; editor . _ . filebrowserSe = this ; // If user didn't select the file, stop the upload.
 if ( ! dialog . getContentElement ( this [ 'for' ] [ 0 ] , this [ 'for' ] [ 1 ] ) . getInputElement ( ) . $ . value ) return false ; if ( ! dialog . getContentElement ( this [ 'for' ] [ 0 ] , this [ 'for' ] [ 1 ] ) . getAction ( ) ) return false ; return true ; }
The onlick function assigned to the 'Upload' button. Makes the final decision whether form is really submitted and updates target field when file is uploaded.  @param {CKEDITOR.event} evt The event object.
The onlick function assigned to the Upload button . Makes the final decision whether form is really submitted and updates target field when file is uploaded .