s:if的用法

1:直接寫運算式

<s:set name="china" value="china">

     <s:if test="${china=='china'}">show</s:if>

     result:show

</s:set>

 

<s:set name="count" value="99">

     <s:if test="${count>0}">bigger than 0</s:if>

     <s:else>not</s:else>

     result:bigger than 0

</s:set>

 

2:直接讀對象

<s:if test="request.price==null  ||   request.price>=0"></s:if>

3:直接讀對象的另一種寫法

<s:if test="%{設定到action中的值!=null}"></s:if>

4:判斷多個條件

<s:if test='%{isShowAll=="Y" || isShowAll==null  ||   isShowAll==""}'>

    <li class="selected"></li>

</s:if>

<s:else>

     <li>else</li>

</s:else>

5:在遍曆裡面用判斷

<s:iterator id="id" value="lable">

     <s:if test="%{#id.attrValue!=0}">

          <s:property value="id.attrValue"/> 

    </s:if>

</s:iterator>

1:直接寫運算式

<s:set name="china" value="china">

     <s:if test="${china=='china'}">show</s:if>

     result:show

</s:set>

 

<s:set name="count" value="99">

     <s:if test="${count>0}">bigger than 0</s:if>

     <s:else>not</s:else>

     result:bigger than 0

</s:set>

 

2:直接讀對象

<s:if test="request.price==null  ||   request.price>=0"></s:if>

3:直接讀對象的另一種寫法

<s:if test="%{設定到action中的值!=null}"></s:if>

4:判斷多個條件

<s:if test='%{isShowAll=="Y" || isShowAll==null  ||   isShowAll==""}'>

    <li class="selected"></li>

</s:if>

<s:else>

     <li>else</li>

</s:else>

5:在遍曆裡面用判斷

<s:iterator id="id" value="lable">

     <s:if test="%{#id.attrValue!=0}">

          <s:property value="id.attrValue"/> 

    </s:if>

</s:iterator>