Apache Struts 2 Documentation > Home > Guides > Tag Developers Guide > Struts Tags > Tag Reference > Generic Tag Reference > param |
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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 {@link Component#addParameter(String, Object) addParamter} method. For unnamed parameters the Tag must implement the UnnamedParametric interface defined in this class (e.g. The TextTag does this). This tag has the following two paramters.
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. WebWork behaves a bit different according to these two situations.
This is best illustrated using an example:
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<pre> <ui:component> <ui:param name="key" value="[0]"/> <ui:param name="value" value="[1]"/> <ui:param name="context" value="[2]"/> </ui:component> </pre> |
where the key will be the identifier and the value the result of an OGNL expression run against the current OgnlValueStack. |