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<h1 class="no_toc" id="iterator">iterator</h1>
<ul id="markdown-toc">
<li><a href="#description" id="markdown-toc-description">Description</a></li>
<li><a href="#attributes" id="markdown-toc-attributes">Attributes</a></li>
<li><a href="#conversion" id="markdown-toc-conversion">Conversion</a></li>
<li><a href="#examples" id="markdown-toc-examples">Examples</a></li>
</ul>
<p>Please make sure you have read the <a href="tag-syntax">Tag Syntax</a> document and understand how tag attribute syntax works.</p>
<blockquote>
<p><strong>NOTE</strong>: The <code class="language-plaintext highlighter-rouge">id</code> attribute is deprecated in Struts 2.1.x, and has been replaced by the <code class="language-plaintext highlighter-rouge">var</code> attribute.
The <code class="language-plaintext highlighter-rouge">begin</code>, <code class="language-plaintext highlighter-rouge">end</code> and <code class="language-plaintext highlighter-rouge">step</code> attributes are only available from 2.1.7+</p>
</blockquote>
<h2 id="description">Description</h2>
<p>Iterator will iterate over a value. An iterable value can be any of: <code class="language-plaintext highlighter-rouge">java.util.Collection</code>, <code class="language-plaintext highlighter-rouge">java.util.Iterator</code>,
<code class="language-plaintext highlighter-rouge">java.util.Enumeration</code>, <code class="language-plaintext highlighter-rouge">java.util.Map</code>, or an array.</p>
<p>Iterate over a iterable value</p>
<h2 id="attributes">Attributes</h2>
<table class="tag-reference">
<tr>
<td colspan="6"><h4>Dynamic Attributes Allowed:</h4> false</td>
</tr>
<tr>
<td colspan="6"><hr /></td>
</tr>
<tr>
<th class="tag-header"><h4>Name</h4></th>
<th class="tag-header"><h4>Required</h4></th>
<th class="tag-header"><h4>Default</h4></th>
<th class="tag-header"><h4>Evaluated</h4></th>
<th class="tag-header"><h4>Type</h4></th>
<th class="tag-header"><h4>Description</h4></th>
</tr>
<tr>
<td class="tag-attribute">begin</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">0</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">Integer</td>
<td class="tag-attribute">if specified the iteration will start on that index</td>
</tr>
<tr>
<td class="tag-attribute">end</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">Size of the 'values' List or array, or 0 if 'step' is negative</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">Integer</td>
<td class="tag-attribute">if specified the iteration will end on that index(inclusive)</td>
</tr>
<tr>
<td class="tag-attribute">performClearTagStateForTagPoolingServers</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">Boolean</td>
<td class="tag-attribute">Whether to clear all tag state during doEndTag() processing (if applicable)</td>
</tr>
<tr>
<td class="tag-attribute">status</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">Boolean</td>
<td class="tag-attribute">If specified, an instanceof IteratorStatus will be pushed into stack upon each iteration</td>
</tr>
<tr>
<td class="tag-attribute">step</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">1</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">Integer</td>
<td class="tag-attribute">if specified the iteration index will be increased by this value on each iteration. It can be a negative value, in which case 'begin' must be greater than 'end'</td>
</tr>
<tr>
<td class="tag-attribute">value</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute"></td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">String</td>
<td class="tag-attribute">the iteratable source to iterate over, else an the object itself will be put into a newly created List</td>
</tr>
<tr>
<td class="tag-attribute">var</td>
<td class="tag-attribute">false</td>
<td class="tag-attribute"></td>
<td class="tag-attribute">false</td>
<td class="tag-attribute">String</td>
<td class="tag-attribute">Name used to reference the value pushed into the Value Stack (scope: action).</td>
</tr>
</table>
<h2 id="conversion">Conversion</h2>
<p>Values generated by the tag are subject of internal conversion mechanism. It means when generating ordinary numbers
and then using them with <code class="language-plaintext highlighter-rouge">&lt;s:property/&gt;</code>, the Integers will be converted to Strings using the current locale.
This can impact how the numbers are presented. Since <strong>Struts 6.4.0</strong> to avoid conversion you can use the <code class="language-plaintext highlighter-rouge">status</code> object
and its <code class="language-plaintext highlighter-rouge">countStr</code> and <code class="language-plaintext highlighter-rouge">indexStr</code> which are a String representation of the numbers. The following example demonstrates
the case when using <code class="language-plaintext highlighter-rouge">fa_IR</code> locale:</p>
<div class="language-jsp highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;s:iterator </span><span class="na">begin=</span><span class="s">"1"</span><span class="na"> end=</span><span class="s">"3"</span><span class="na"> status=</span><span class="s">"status"</span><span class="nt">&gt;</span>
<span class="nt">&lt;s:property/&gt;</span>
<span class="nt">&lt;s:textfield </span><span class="na">id=</span><span class="s">"text_%{#status.countStr}"</span><span class="na"> name=</span><span class="s">"test[%{#status.indexStr}]"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/s:iterator&gt;</span>
</code></pre></div></div>
<div class="language-html highlighter-rouge"><div class="highlight"><pre class="highlight"><code>۰
<span class="nt">&lt;input</span> <span class="na">type=</span><span class="s">"text"</span> <span class="na">name=</span><span class="s">"test[0]"</span> <span class="na">value=</span><span class="s">""</span> <span class="na">id=</span><span class="s">"text_1"</span><span class="nt">&gt;</span>
۱
<span class="nt">&lt;input</span> <span class="na">type=</span><span class="s">"text"</span> <span class="na">name=</span><span class="s">"test[1]"</span> <span class="na">value=</span><span class="s">""</span> <span class="na">id=</span><span class="s">"text_2"</span><span class="nt">&gt;</span>
۲
<span class="nt">&lt;input</span> <span class="na">type=</span><span class="s">"text"</span> <span class="na">name=</span><span class="s">"test[2]"</span> <span class="na">value=</span><span class="s">""</span> <span class="na">id=</span><span class="s">"text_3"</span><span class="nt">&gt;</span>
</code></pre></div></div>
<h2 id="examples">Examples</h2>
<p>The following example retrieves the value of the getDays() method of the current object on the value stack and uses
it to iterate over. The <code class="language-plaintext highlighter-rouge">&lt;s:property/&gt;</code> tag prints out the current value of the iterator.</p>
<div class="language-jsp highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;s:iterator </span><span class="na">value=</span><span class="s">"days"</span><span class="nt">&gt;</span>
<span class="nt">&lt;p&gt;</span>day is: <span class="nt">&lt;s:property/&gt;&lt;/p&gt;</span>
<span class="nt">&lt;/s:iterator&gt;</span>
</code></pre></div></div>
<p>The following example uses a <a href="bean-tag">Bean</a> tag and places it into the <code class="language-plaintext highlighter-rouge">ActionContext</code>. The iterator tag will retrieve
that object from the <code class="language-plaintext highlighter-rouge">ActionContext</code> and then calls its <code class="language-plaintext highlighter-rouge">getDays()</code> method as above. The status attribute is also used
to create an <code class="language-plaintext highlighter-rouge">IteratorStatus</code> object, which in this example, its <code class="language-plaintext highlighter-rouge">odd()</code> method is used to alternate row colours:</p>
<div class="language-jsp highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;s:bean </span><span class="na">name=</span><span class="s">"org.apache.struts2.example.IteratorExample"</span><span class="na"> var=</span><span class="s">"it"</span><span class="nt">&gt;</span>
<span class="nt">&lt;s:param </span><span class="na">name=</span><span class="s">"day"</span><span class="na"> value=</span><span class="s">"'foo'"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;s:param </span><span class="na">name=</span><span class="s">"day"</span><span class="na"> value=</span><span class="s">"'bar'"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/s:bean&gt;</span>
<span class="nt">&lt;table</span> <span class="na">border=</span><span class="s">"0"</span> <span class="na">cellspacing=</span><span class="s">"0"</span> <span class="na">cellpadding=</span><span class="s">"1"</span><span class="nt">&gt;</span>
<span class="nt">&lt;tr&gt;</span>
<span class="nt">&lt;th&gt;</span>Days of the week<span class="nt">&lt;/th&gt;</span>
<span class="nt">&lt;/tr&gt;</span>
<span class="nt">&lt;s:iterator </span><span class="na">value=</span><span class="s">"#it.days"</span><span class="na"> status=</span><span class="s">"rowstatus"</span><span class="nt">&gt;</span>
<span class="nt">&lt;tr&gt;</span>
<span class="nt">&lt;s:if </span><span class="na">test=</span><span class="s">"#rowstatus.odd == true"</span><span class="nt">&gt;</span>
<span class="nt">&lt;td</span> <span class="na">style=</span><span class="s">"background: grey"</span><span class="nt">&gt;&lt;s:property/&gt;&lt;/td&gt;</span>
<span class="nt">&lt;/s:if&gt;</span>
<span class="nt">&lt;s:else&gt;</span>
<span class="nt">&lt;td&gt;&lt;s:property/&gt;&lt;/td&gt;</span>
<span class="nt">&lt;/s:else&gt;</span>
<span class="nt">&lt;/tr&gt;</span>
<span class="nt">&lt;/s:iterator&gt;</span>
<span class="nt">&lt;/table&gt;</span>
</code></pre></div></div>
<p>The next example will further demonstrate the use of the status attribute, using a DAO obtained from the action class
through OGNL, iterating over groups and their users (in a security context). The last() method indicates if the current
object is the last available in the iteration, and if not, we need to separate the users using a comma:</p>
<div class="language-jsp highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;s:iterator </span><span class="na">value=</span><span class="s">"groupDao.groups"</span><span class="na"> status=</span><span class="s">"groupStatus"</span><span class="nt">&gt;</span>
<span class="nt">&lt;tr</span> <span class="na">class=</span><span class="s">"</span><span class="nt">&lt;s:if </span><span class="na">test=</span><span class="s">"#groupStatus.odd == true "</span><span class="nt">&gt;</span><span class="s">odd</span><span class="nt">&lt;/s:if&gt;&lt;s:else&gt;</span><span class="s">even</span><span class="nt">&lt;/s:else&gt;</span><span class="s">"</span><span class="nt">&gt;</span>
<span class="nt">&lt;td&gt;&lt;s:property </span><span class="na">value=</span><span class="s">"name"</span> <span class="nt">/&gt;&lt;/td&gt;</span>
<span class="nt">&lt;td&gt;&lt;s:property </span><span class="na">value=</span><span class="s">"description"</span> <span class="nt">/&gt;&lt;/td&gt;</span>
<span class="nt">&lt;td&gt;</span>
<span class="nt">&lt;s:iterator </span><span class="na">value=</span><span class="s">"users"</span><span class="na"> status=</span><span class="s">"userStatus"</span><span class="nt">&gt;</span>
<span class="nt">&lt;s:property </span><span class="na">value=</span><span class="s">"fullName"</span> <span class="nt">/&gt;&lt;s:if </span><span class="na">test=</span><span class="s">"!#userStatus.last"</span><span class="nt">&gt;</span>,<span class="nt">&lt;/s:if&gt;</span>
<span class="nt">&lt;/s:iterator&gt;</span>
<span class="nt">&lt;/td&gt;</span>
<span class="nt">&lt;/tr&gt;</span>
<span class="nt">&lt;/s:iterator&gt;</span>
</code></pre></div></div>
<p>The next example iterates over a an action collection and passes every iterator value to another action. The trick here
lies in the use of the <code class="language-plaintext highlighter-rouge">[0]</code> operator. It takes the current iterator value and passes it on to the edit action.
Using the <code class="language-plaintext highlighter-rouge">[0]</code> operator has the same effect as using <code class="language-plaintext highlighter-rouge">&lt;s:property /&gt;</code>. (The latter, however, does not work from inside
the <code class="language-plaintext highlighter-rouge">param</code> tag).</p>
<div class="language-jsp highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;s:action </span><span class="na">name=</span><span class="s">"entries"</span><span class="na"> var=</span><span class="s">"entries"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;s:iterator </span><span class="na">value=</span><span class="s">"#entries.entries"</span> <span class="nt">&gt;</span>
<span class="nt">&lt;s:property </span><span class="na">value=</span><span class="s">"name"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;s:property /&gt;</span>
<span class="nt">&lt;s:push </span><span class="na">value=</span><span class="s">"..."</span><span class="nt">&gt;</span>
<span class="nt">&lt;s:action </span><span class="na">name=</span><span class="s">"edit"</span><span class="na"> var=</span><span class="s">"edit"</span> <span class="nt">&gt;</span>
<span class="nt">&lt;s:param </span><span class="na">name=</span><span class="s">"entry"</span><span class="na"> value=</span><span class="s">"[0]"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/s:action&gt;</span>
<span class="nt">&lt;/push&gt;</span>
<span class="nt">&lt;/s:iterator&gt;</span>
</code></pre></div></div>
<p>A loop that iterates 5 times</p>
<div class="language-jsp highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;s:iterator </span><span class="na">var=</span><span class="s">"counter"</span><span class="na"> begin=</span><span class="s">"1"</span><span class="na"> end=</span><span class="s">"5"</span> <span class="nt">&gt;</span>
<span class="c">&lt;!-- current iteration value (1, ... 5) --&gt;</span>
<span class="nt">&lt;s:property </span><span class="na">value=</span><span class="s">"top"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/s:iterator&gt;</span>
</code></pre></div></div>
<p>Another way to create a simple loop, similar to JSTL’s <code class="language-plaintext highlighter-rouge">&lt;c:forEach begin="..." end="..." ...&gt;</code> is to use some OGNL
magic, which provides some under-the-covers magic to make 0-n loops trivial. This example also loops five times.</p>
<div class="language-jsp highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;s:iterator </span><span class="na">status=</span><span class="s">"stat"</span><span class="na"> value=</span><span class="s">"(5).{ #this }"</span> <span class="nt">&gt;</span>
<span class="nt">&lt;s:property </span><span class="na">value=</span><span class="s">"#stat.count"</span> <span class="nt">/&gt;</span> <span class="c">&lt;!-- Note that "count" is 1-based, "index" is 0-based. --&gt;</span>
<span class="nt">&lt;/s:iterator&gt;</span>
</code></pre></div></div>
<p>A loop that iterates over a partial list</p>
<div class="language-jsp highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;s:iterator </span><span class="na">value=</span><span class="s">"{1,2,3,4,5}"</span><span class="na"> begin=</span><span class="s">"2"</span><span class="na"> end=</span><span class="s">"4"</span> <span class="nt">&gt;</span>
<span class="c">&lt;!-- current iteration value (2,3,4) --&gt;</span>
<span class="nt">&lt;s:property </span><span class="na">value=</span><span class="s">"top"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/s:iterator&gt;</span>
</code></pre></div></div>
<p>Another example when we can access a variable out of the current loop context and where name clashes with the current</p>
<div class="language-jsp highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;s:select </span><span class="na">name=</span><span class="s">"location"</span><span class="na"> size=</span><span class="s">"1"</span><span class="na"> list=</span><span class="s">"locations"</span><span class="na"> listKey=</span><span class="s">"key"</span><span class="na">
listValue=</span><span class="s">"value"</span><span class="na"> emptyOption=</span><span class="s">"false"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;s:iterator </span><span class="na">var=</span><span class="s">"item"</span><span class="na"> value=</span><span class="s">"items"</span><span class="na"> status=</span><span class="s">"rowstatus"</span><span class="nt">&gt;</span>
<span class="nt">&lt;s:url </span><span class="na">var=</span><span class="s">"myUrl"</span><span class="na"> action=</span><span class="s">"itemDelete"</span><span class="nt">&gt;</span>
<span class="nt">&lt;s:param </span><span class="na">name=</span><span class="s">"id"</span><span class="na"> value=</span><span class="s">"#item.id"</span> <span class="nt">/&gt;</span>
<span class="c">&lt;%-- Outer loop variable name [1]. as clash with item.location --%&gt;</span>
<span class="nt">&lt;s:param </span><span class="na">name=</span><span class="s">"location"</span><span class="na"> value=</span><span class="s">"[1].location"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/s:url&gt;</span>
<span class="nt">&lt;/s:iterator&gt;</span>
</code></pre></div></div>
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