Class Param
This tag can be used to parameterize other tags.
 The include tag and bean tag are examples of such tags.
 
 The parameters can be added with or without a name as key.
 If the tag provides a name attribute the parameters are added using the
 addParamter method.
 For unnamed parameters the Tag must implement the Param.UnnamedParametric interface defined in
 this class (e.g. The TextTag does this).
 
This tag has the following two paramters.
- name (String) - the name of the parameter
- value (Object) - the value of the parameter
- suppressEmptyParameters (boolean) - whether to suppress this parameter if empty
 Note:
 When you declare the param tag, the value can be defined in either a value attribute or
 as text between the start and end tag. Struts behaves a bit different according to these two situations.
 This is best illustrated using an example:
 
<param name="color">blue</param> <-- (A) -->
 
<param name="color" value="blue"/> <-- (B) -->
 
In the first situation (A) the value would be evaluated to the stack as a java.lang.String object.
 And in situation (B) the value would be evaluated to the stack as a java.lang.Object object.
 
For more information see WW-808.
 
Examples
<ui:component> <ui:param name="key" value="[0]"/> <ui:param name="value" value="[1]"/> <ui:param name="context" value="[2]"/> </ui:component>
Whether to suppress empty parameters:
 <s:url action="eventAdd">
   <s:param name="bean.searchString" value="%{bean.searchString}" />
   <s:param name="bean.filter" value="%{bean.filter}" />
   <s:param name="bean.pageNum" value="%{pager.pageNumber}" suppressEmptyParameters="true" />
 </s:url>
 
 
 where the key will be the identifier and the value the result of an OGNL expression run against the current ValueStack.
This second example demonstrates how the text tag can use parameters from this param tag.
 <s:text name="cart.total.cost">
     <s:param value="#session.cartTotal"/>
 </s:text>
 
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Nested Class SummaryNested ClassesModifier and TypeClassDescriptionstatic interfaceTags can implement this to support nested param tags without the name attribute.
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Field SummaryFieldsFields inherited from class org.apache.struts2.components.ComponentactionMapper, attributes, COMPONENT_STACK, devMode, escapeHtmlBody, performClearTagStateForTagPoolingServers, stack, standardAttributesMap, throwExceptionOnELFailure
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Constructor SummaryConstructors
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Method SummaryMethods inherited from class org.apache.struts2.components.ComponentaddAllAttributes, addParameter, completeExpression, copyAttributes, determineActionURL, determineNamespace, end, escapeHtmlBody, fieldError, findAncestor, findString, findString, findValue, findValue, findValue, getAttributes, getComponentStack, getNamespace, getPerformClearTagStateForTagPoolingServers, getStack, getStandardAttributes, isAcceptableExpression, isValidTagAttribute, popComponentStack, setActionMapper, setDevMode, setEscapeHtmlBody, setNotExcludedAcceptedPatterns, setPerformClearTagStateForTagPoolingServers, setThrowExceptionsOnELFailure, setUrlHelper, start, stripExpression, toString
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Field Details- 
name
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value
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suppressEmptyParametersprotected boolean suppressEmptyParameters
 
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Constructor Details- 
Param
 
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Method Details- 
endDescription copied from class:ComponentCallback for the end tag of this component. Should the body be evaluated again?
 NOTE: will pop component stack.
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usesBodypublic boolean usesBody()Description copied from class:ComponentOverwrite to set if body should be used.
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setName
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setValue
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setSuppressEmptyParameterspublic void setSuppressEmptyParameters(boolean suppressEmptyParameters) 
 
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