The dsp:droplet tag lets you invoke a servlet bean from a JSP page. It encapsulates programming logic in a server-side JavaBean and makes that logic accessible to the JSP page that calls it. Tag output is held by its parameters, which can be referenced by nested tags.
Attributes
Servletbeaninstance:name(Required)
The name attribute is set to the Nucleus path and servlet bean you want to invoke.
MapVariableholdingServletBeanParameters:var
The var attribute provides a name to a Map variable that holds a servlet bean’s parameters and parameter values. The var attribute enables EL access to the servlet’s parameters. When you use var , you can set the scope attribute to determine the context—such as page or request—the variable exists in.
The name given to the var attribute is usually a shorthand version of the servlet bean name, such as ForEach might use fe.
TagVariable:id
The id attribute names a scripting variable that scriptlets and expressions can access at runtime.
VariableScope:scope
The scope attribute determines where the Map variable identified by the var attribute is stored and what resources can access it. Options include: page and request. Omitting this attribute causes the default, page, to be used.
Examples
<dsp:droplet var="fe" name="/atg/dynamo/droplet/ForEach">
<dsp:param bean="/samples/Student_01.subjects" name="array"/>
<dsp:oparam name="outputStart">
<p>The student is registered for these courses:
</dsp:oparam>
<dsp:oparam name="output">
<li><c:out value="${fe.element}"/>
</dsp:oparam>
</dsp:droplet>
In this example, the dsp:droplet tag calls the ForEach servlet bean and creates a Map variable called fe that saves each parameter and parameter value used on this page. The ForEach servlet bean iterates through each item in the Student_01.subjects array and, beneath the message text The student is registered for these courses,the c:out JSTL tag uses EL to displays each item.
