A gadget is an individual piece of functionality encapsulated in a JSP file, so it can easily be included in multiple pages or moved to different locations on a page. For example, the links for sorting product listings on a category page execute logic implemented by the /global/gadgets/sortGadget.jsp file.
The use of gadgets makes it possible to build pages from reusable elements. For example, consider the /navigation/gadgets/search.jsp gadget, which creates the Search dialog box found on most pages:
<dsp:page>
<dsp:importbean bean="/atg/store/StoreConfiguration" />
<div id="atg_store_search">
<dsp:getvalueof var="atgSearchInstalled"
bean="StoreConfiguration.atgSearchInstalled" />
<c:choose>
<c:when test="${atgSearchInstalled == 'true'}">
<dsp:include page="/atgsearch/gadgets/atgSearch.jsp" />
</c:when>
<c:otherwise>
<dsp:include page="/search/gadgets/simpleSearch.jsp" />
</c:otherwise>
</c:choose>
</div>
</dsp:page>This gadget determines whether ATG Search is installed and, if it is, invokes another gadget that creates a search form for issuing queries to ATG Search. If ATG Search is not installed, the /navigation/gadgets/search.jsp gadget instead invokes a gadget that creates a form for performing database searches.
