Struts 2 Tags

Struts 2 Tags

<%@taglib prefix="s" uri="/struts-tags"%>

<h3></h3>

<h3> Conditionals </h3>

<s:if test='name=="abc"'>

you are <s:property value="name"/>

</s:if>

<s:else>

you are not abc

</s:else>





<h3>collections and Iteration(ArrayList) </h3>

<ul>

    <s:iterator value="books" var="book">

    <li><s:property value="book"/></li>

    </s:iterator>

</ul>



<h3>collections and Iteration (Map)</h3>

<ul>

    <s:iterator value="emails">

    <li><s:property value="key"/> : <s:property value="value"/></li>

    </s:iterator>

</ul>



<ul>

    <s:iterator value="emails" var="item">

    <li><s:property value="#item.key"/> : <s:property value="#item.value"/></li>

    </s:iterator>

</ul>



<h3>tracking iteration status </h3>

<ul>

    <s:iterator value="books" var="book" status="stat">

    

    <li>

        

        <s:property value="#stat.index"/>:

        <s:property value="#stat.count"/>:

        <s:property value="#stat.even"/>:

        <s:property value="#stat.odd"/>:

        <s:property value="#stat.first"/>:

        <s:property value="#stat.last"/>:

        <s:property value="#stat.modulus(2)"/>:

        <s:property value="#stat.modulus(4)"/>:

        <s:property value="#stat.count%4"/>:

        <s:property value="book"/>

    </li>

    </s:iterator>

</ul>





<h3> s:generator : it is used to create a list in value stack</h3>

<s:generator val="'1,2,3,4,5'" separator=",">

    <ul>

        <s:iterator>

        <li><s:property/></li>

        </s:iterator>

    </ul>

</s:generator>



<h3> here we can create a variavle that poits the list generated by generator</h3>

<s:generator val="'1,2,3,4,5'" separator="," var="mylist"/>

<h3> now we can use it anywhere</h3>

<ul>

    <s:iterator value="mylist">

    <li><s:property/></li>

    </s:iterator>

</ul>

<h3> After full iteration we can not use mylist itarator again

we need to generate new list</h3>



<h3> Using convertor in generator.

get a object from action class that implements IteratorGenerator.Converter </h3>

<s:generator val="'1,2,3,4,5,6,7,8,9,0'" separator="," var="mylist" converter="digitConverter"/>

<ul>

    <s:iterator value="mylist">

    <li><s:property/></li>

    </s:iterator>

</ul>



<h3>s:append </h3>

<s:append var="appended">

    <s:param value="{1,2,3,4}"/>

    <s:param value="{'a','b','c','d'}"/>

</s:append>



<s:iterator value="appended">

    <s:property/> 

</s:iterator>



<h3>s:merge</h3>



<s:merge var="merged">

    <s:param value="{1,2,3,4}"/>

    <s:param value="{'a','b','c','d'}"/>

</s:merge>



<s:iterator value="merged">

    <s:property/> 

</s:iterator>



<h3>s:subset - use to get iterate on portion of items from collection</h3>

<!--data from books property of action -->

<s:subset source='books' start="2" count="2">

    <s:iterator>

        <s:property/> 

    </s:iterator>

</s:subset>

<%--<s:debug/>--%>





Output

Conditionals

you are not abc

collections and Iteration(ArrayList)

• Java
• J2EE
• JSP
• Servlet
• C
• C++

collections and Iteration (Map)

• abc : abc@gmail.com
• xyz : xyz@yahoo.com
• bbc : bbc@gjh.com

• abc : abc@gmail.com
• xyz : xyz@yahoo.com
• bbc : bbc@gjh.com

tracking iteration status

• 0: 1: false: true: true: false: 1: 1: 1: Java
• 1: 2: true: false: false: false: 0: 2: 2: J2EE
• 2: 3: false: true: false: false: 1: 3: 3: JSP
• 3: 4: true: false: false: false: 0: 0: 0: Servlet
• 4: 5: false: true: false: false: 1: 1: 1: C
• 5: 6: true: false: false: true: 0: 2: 2: C++

s:generator : it is used to create a list in value stack

• 1
• 2
• 3
• 4
• 5

here we can create a variavle that poits the list generated by generator

now we can use it anywhere

• 1
• 2
• 3
• 4
• 5

After full iteration we can not use mylist itarator again we need to generate new list

Using convertor in generator. get a object from action class that implements IteratorGenerator.Converter

• one
• two
• three
• four
• five
• six
• seven
• eight
• nine
• zero

s:append

1  2  3  4  a  b  c  d 

s:merge

1  a  2  b  3  c  4  d 

s:subset - use to get iterate on portion of items from collection

JSP  Servlet