If

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摘要：嵌套 | 字段 | 构造方法 | 方法

详细信息：字段 | 构造方法 | 方法

org.apache.struts2.components
类 If

java.lang.Object
  org.apache.struts2.components.Component
      org.apache.struts2.components.If

public class If extends Component
extends Component

Perform basic condition flow. 'If' tag could be used by itself or with 'Else If' Tag and/or single/multiple 'Else' Tag.

test* (Boolean) - Logic to determined if body of tag is to be displayed

 
  <s:if test="%{false}">
      <div>Will Not Be Executed</div>
  </s:if>
  <s:elseif test="%{true}">
      <div>Will Be Executed</div>
  </s:elseif>
  <s:else>
      <div>Will Not Be Executed</div>
  </s:else>

另请参见：: Else, ElseIf

字段摘要
`static String`	`ANSWER`

从类 org.apache.struts2.components.Component 继承的字段
`COMPONENT_STACK`

构造方法摘要
`If(com.opensymphony.xwork2.util.ValueStack stack)`

方法摘要
`boolean`	`end(Writer writer, String body)` Callback for the end tag of this component.
`void`	`setTest(String test)`
`boolean`	`start(Writer writer)` Callback for the start tag of this component.

从类 org.apache.struts2.components.Component 继承的方法
`addAllParameters, addParameter, altSyntax, copyParams, getComponentStack, getParameters, getStack, setActionMapper, setThrowExceptionsOnELFailure, setUrlHelper, usesBody`

从类 java.lang.Object 继承的方法
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

字段详细信息

ANSWER

public static final String ANSWER

另请参见：: 常量字段值

构造方法详细信息

If

public If(com.opensymphony.xwork2.util.ValueStack stack)

方法详细信息

setTest

public void setTest(String test)

start

public boolean start(Writer writer)

从类 Component 复制的描述

Callback for the start tag of this component. Should the body be evaluated?

覆盖：: 类 Component 中的 start

参数：: writer - the output writer.
返回：: true if the body should be evaluated

end

public boolean end(Writer writer,
                   String body)