org.apache.taglibs.request
Class ExistsParameterTag
java.lang.Object
javax.servlet.jsp.tagext.TagSupport
org.apache.taglibs.request.ExistsParameterTag
- All Implemented Interfaces:
- java.io.Serializable, javax.servlet.jsp.tagext.IterationTag, javax.servlet.jsp.tagext.Tag
public class ExistsParameterTag
- extends javax.servlet.jsp.tagext.TagSupport
JSP Tag existsParameter, used to determine if an HttpServletRequest
parameter exists.
Includes the body of the tag if the parameter exists.
You can set the optional tag parameter value to true or
false. The body of the tag is included if existsParameter matches
the value.
JSP Tag Lib Descriptor
<name>existsParameter</name>
<tagclass>org.apache.taglibs.request.ExistsParameterTag</tagclass>
<bodycontent>JSP</bodycontent>
<info>Includes the body of the tag if the request parameter exists.</info>
<attribute>
<name>name</name>
<required>true</required>
<rtexprvalue>false</rtexprvalue>
</attribute>
<attribute>
<name>value</name>
<required>false</required>
<rtexprvalue>false</rtexprvalue>
</attribute>
- Author:
- Glenn Nielsen
- See Also:
- Serialized Form
Fields inherited from class javax.servlet.jsp.tagext.TagSupport |
id, pageContext |
Fields inherited from interface javax.servlet.jsp.tagext.IterationTag |
EVAL_BODY_AGAIN |
Fields inherited from interface javax.servlet.jsp.tagext.Tag |
EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE |
Method Summary |
int |
doStartTag()
Includes the body of the tag if the request parameter exists. |
void |
setName(java.lang.String str)
Set the required tag attribute name. |
void |
setValue(boolean value)
Set the optional tag attribute value to true or false. |
Methods inherited from class javax.servlet.jsp.tagext.TagSupport |
doAfterBody, doEndTag, findAncestorWithClass, getId, getParent, getValue, getValues, release, removeValue, setId, setPageContext, setParent, setValue |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
ExistsParameterTag
public ExistsParameterTag()
doStartTag
public final int doStartTag()
throws javax.servlet.jsp.JspException
- Includes the body of the tag if the request parameter exists.
- Specified by:
doStartTag
in interface javax.servlet.jsp.tagext.Tag
- Overrides:
doStartTag
in class javax.servlet.jsp.tagext.TagSupport
- Returns:
- SKIP_BODY if existsParameter doesn't match value, EVAL_BODY_include if existsParameter matches value
- Throws:
javax.servlet.jsp.JspException
setName
public final void setName(java.lang.String str)
- Set the required tag attribute name.
- Parameters:
String
- name of HTTP input parameter
setValue
public final void setValue(boolean value)
- Set the optional tag attribute value to true or false.
- Parameters:
boolean
- true or false
Copyright ? 2000-2004 The Apache Software Foundation. All Rights Reserved.