(optional) The options for loading. Options are: customLoadingText [type: String] - (optional) Custom loading text to show. If this is null, default text is used. element [type: HTMLElement] - (optional) The element to show the loading overlay on. isInputInlineLoading [type: Boolean] - (optional) Specifies the loading should be an inline input loading icon. If this is used, element must be specified (the input element). isErrorIgnored [type: Boolean] - (optional) If set to true, any error reported by the call will not be automatically shown on the UI. ignoreInvalidSession [type: Boolean] - (optional) If set to true, invalid sessions ajax returns will be ignored. Normally they will redirect the user to the logon page. showDelay [type: Number] - (optional) Time delay in milliseconds before showing the loading screen, defaults to 500ms if null.