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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.4.2_03) on Mon Jul 19 14:16:12 PDT 2004 --><TITLE>ConditionalTagSupport</TITLE><META NAME="keywords" CONTENT="javax.servlet.jsp.jstl.core.ConditionalTagSupport class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="ConditionalTagSupport";}</SCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD 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ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> PREV CLASS <A HREF="../../../../../javax/servlet/jsp/jstl/core/Config.html" title="class in javax.servlet.jsp.jstl.core"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="ConditionalTagSupport.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | <A HREF="#fields_inherited_from_class_javax.servlet.jsp.tagext.TagSupport">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.servlet.jsp.jstl.core</FONT><BR>Class ConditionalTagSupport</H2><PRE>java.lang.Object <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by">javax.servlet.jsp.tagext.TagSupport <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by"><B>javax.servlet.jsp.jstl.core.ConditionalTagSupport</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>javax.servlet.jsp.tagext.IterationTag, java.io.Serializable, javax.servlet.jsp.tagext.Tag</DD></DL><HR><DL><DT>public abstract class <B>ConditionalTagSupport</B><DT>extends javax.servlet.jsp.tagext.TagSupport</DL><P><p>ConditionalTagSupport is an abstract class that facilitates implementation of conditional tags -- specifically, tags in the style of <if>.</p> <p>In particular, this base class provides support for:</p> <ul> <li> conditional execution based on an overridable <tt>condition()</tt> method </li> <li> scoped attributes storing the result (as a Boolean) of the logic executed by a subclass (optionally by attribute) </li> </ul> <p>Since this method implements the behavior anticipated to be recommended by the standard (with respect to tags that support boolean logic), it is expected that it will be part of the JSTL API. </p><P><P><DL><DT><B>Author:</B></DT> <DD>Shawn Bayern</DD><DT><B>See Also:</B><DD><A HREF="../../../../../serialized-form.html#javax.servlet.jsp.jstl.core.ConditionalTagSupport">Serialized Form</A></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR></TABLE> <A NAME="fields_inherited_from_class_javax.servlet.jsp.tagext.TagSupport"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class javax.servlet.jsp.tagext.TagSupport</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>id, pageContext</CODE></TD></TR></TABLE> <A NAME="fields_inherited_from_class_javax.servlet.jsp.tagext.IterationTag"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface javax.servlet.jsp.tagext.IterationTag</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>EVAL_BODY_AGAIN</CODE></TD></TR></TABLE> <A NAME="fields_inherited_from_class_javax.servlet.jsp.tagext.Tag"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface javax.servlet.jsp.tagext.Tag</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE</CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../../../javax/servlet/jsp/jstl/core/ConditionalTagSupport.html#ConditionalTagSupport()">ConditionalTagSupport</A></B>()</CODE><BR> Base constructor to initialize local state.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../javax/servlet/jsp/jstl/core/ConditionalTagSupport.html#condition()">condition</A></B>()</CODE><BR> Returns a <tt>boolean</tt> representing the condition that a particular subclass uses to drive its conditional logic.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../javax/servlet/jsp/jstl/core/ConditionalTagSupport.html#doStartTag()">doStartTag</A></B>()</CODE><BR> Includes its body if <tt>condition()</tt> evaluates to true.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../javax/servlet/jsp/jstl/core/ConditionalTagSupport.html#release()">release</A></B>()</CODE>⌨️ 快捷键说明
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