..  include:: /Includes.rst.txt


==========================
Cache / HasCacheViewHelper
==========================

This is a ViewHelper to check, if a cache entry exists.

General properties
==================

..  confval-menu::
    :name: confval-has-cache
    :display: table
    :required:
    :type:

..  confval:: prefix
    :name: has-cache-prefix
    :required: false
    :type: string

    If you want you can define a prefix for the generated CacheIdentifier. Leave
    this value empty to use "infoWindow" as default value

..  confval:: poiCollection
    :name: has-cache-poiCollection
    :required: true
    :type: PoiCollection

    You must assign the PoiCollection object to this ViewHelper. We extract some
    data from PoiCollection to build a more unique CacheIdentifier which can differ
    Caches in multilingual environment.

Examples
========

Basic example
-------------

..  code-block:: html

    <f:if condition="{maps2:cache.hasCache(poiCollection: poiCollection)}">
      <f:then>
      </f:then>
      <f:else>
      </f:else>
    </f:if>