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<a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/tag-developers/combobox-tag.md" title="Edit this page on GitHub">Edit on GitHub</a>
<a href="tag-reference.html" title="back to Tag Reference"><< back to Tag Reference</a>
<h1 id="combobox">combobox</h1>
<p>Please make sure you have read the <a href="tag-syntax">Tag Syntax</a> document and understand how tag attribute syntax works.</p>
<h2 id="description">Description</h2>
<p>The combo box is basically an HTML INPUT of type text and HTML SELECT grouped together to give you a combo box
functionality. You can place text in the INPUT control by using the SELECT control or type it in directly in
the text field.</p>
<p>In this example, the SELECT will be populated from id=year attribute. Counter is itself an Iterator. It will
span from first to last. The population is done via javascript, and requires that this tag be surrounded by a</p>
<p>Note that unlike the <code class="highlighter-rouge">&lt;s:select/&gt;</code> tag, there is no ability to define the individual <code class="highlighter-rouge">&lt;option&gt;</code> tags’ id attribute
or content separately. Each of these is simply populated from the toString() method of the list item. Presumably
this is because the select box isn’t intended to actually submit useful data, but to assist the user in filling
out the text field.</p>
<p>Widget that fills a text box from a select</p>
<h2 id="attributes">Attributes</h2>
<table width="100%">
<tr>
<td colspan="6"><h4>Dynamic Attributes Allowed:</h4> false</td>
</tr>
<tr>
<td colspan="6">&nbsp;</td>
</tr>
<tr>
<th align="left" valign="top"><h4>Name</h4></th>
<th align="left" valign="top"><h4>Required</h4></th>
<th align="left" valign="top"><h4>Default</h4></th>
<th align="left" valign="top"><h4>Evaluated</h4></th>
<th align="left" valign="top"><h4>Type</h4></th>
<th align="left" valign="top"><h4>Description</h4></th>
</tr>
<tr>
<td align="left" valign="top">accesskey</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html accesskey attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">class</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">The css class to use for element - it's an alias of cssClass attribute.</td>
</tr>
<tr>
<td align="left" valign="top">cssClass</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">The css class to use for element</td>
</tr>
<tr>
<td align="left" valign="top">cssErrorClass</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">The css error class to use for element</td>
</tr>
<tr>
<td align="left" valign="top">cssErrorStyle</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">The css error style definitions for element to use</td>
</tr>
<tr>
<td align="left" valign="top">cssStyle</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">The css style definitions for element to use</td>
</tr>
<tr>
<td align="left" valign="top">disabled</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html disabled attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">emptyOption</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Decide if an empty option is to be inserted. Default false.</td>
</tr>
<tr>
<td align="left" valign="top">errorPosition</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Define error position of form element (top|bottom)</td>
</tr>
<tr>
<td align="left" valign="top">headerKey</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the header key for the header option.</td>
</tr>
<tr>
<td align="left" valign="top">headerValue</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the header value for the header option.</td>
</tr>
<tr>
<td align="left" valign="top">id</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">HTML id attribute</td>
</tr>
<tr>
<td align="left" valign="top">javascriptTooltip</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">Boolean</td>
<td align="left" valign="top">Use JavaScript to generate tooltips</td>
</tr>
<tr>
<td align="left" valign="top">key</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the key (name, value, label) for this particular component</td>
</tr>
<tr>
<td align="left" valign="top">label</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Label expression used for rendering an element specific label</td>
</tr>
<tr>
<td align="left" valign="top">labelSeparator</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">:</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">String that will be appended to the label</td>
</tr>
<tr>
<td align="left" valign="top">labelposition</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Define label position of form element (top/left)</td>
</tr>
<tr>
<td align="left" valign="top">list</td>
<td align="left" valign="top"><strong>true</strong></td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Iterable source to populate from. If this is missing, the select widget is simply not displayed.</td>
</tr>
<tr>
<td align="left" valign="top">listKey</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the key used to retrieve the option key.</td>
</tr>
<tr>
<td align="left" valign="top">listValue</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the value used to retrieve the option value.</td>
</tr>
<tr>
<td align="left" valign="top">maxLength</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">Integer</td>
<td align="left" valign="top">Deprecated. Use maxlength instead.</td>
</tr>
<tr>
<td align="left" valign="top">maxlength</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">Integer</td>
<td align="left" valign="top">HTML maxlength attribute</td>
</tr>
<tr>
<td align="left" valign="top">name</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">The name to set for element</td>
</tr>
<tr>
<td align="left" valign="top">onblur</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top"> Set the html onblur attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">onchange</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html onchange attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">onclick</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html onclick attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">ondblclick</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html ondblclick attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">onfocus</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html onfocus attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">onkeydown</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html onkeydown attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">onkeypress</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html onkeypress attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">onkeyup</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html onkeyup attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">onmousedown</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html onmousedown attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">onmousemove</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html onmousemove attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">onmouseout</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html onmouseout attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">onmouseover</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html onmouseover attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">onmouseup</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html onmouseup attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">onselect</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html onselect attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">readonly</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">Boolean</td>
<td align="left" valign="top">Whether the input is readonly</td>
</tr>
<tr>
<td align="left" valign="top">requiredLabel</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">Boolean</td>
<td align="left" valign="top">If set to true, the rendered element will indicate that input is required</td>
</tr>
<tr>
<td align="left" valign="top">requiredPosition</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Define required position of required form element (left|right)</td>
</tr>
<tr>
<td align="left" valign="top">size</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">Integer</td>
<td align="left" valign="top">HTML size attribute</td>
</tr>
<tr>
<td align="left" valign="top">style</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">The css style definitions for element to use - it's an alias of cssStyle attribute.</td>
</tr>
<tr>
<td align="left" valign="top">tabindex</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html tabindex attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">template</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">The template (other than default) to use for rendering the element</td>
</tr>
<tr>
<td align="left" valign="top">templateDir</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">The template directory.</td>
</tr>
<tr>
<td align="left" valign="top">theme</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">The theme (other than default) to use for rendering the element</td>
</tr>
<tr>
<td align="left" valign="top">title</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the html title attribute on rendered html element</td>
</tr>
<tr>
<td align="left" valign="top">tooltip</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Set the tooltip of this particular component</td>
</tr>
<tr>
<td align="left" valign="top">tooltipConfig</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Deprecated. Use individual tooltip configuration attributes instead.</td>
</tr>
<tr>
<td align="left" valign="top">tooltipCssClass</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">StrutsTTClassic</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">CSS class applied to JavaScrip tooltips</td>
</tr>
<tr>
<td align="left" valign="top">tooltipDelay</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">Classic</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Delay in milliseconds, before showing JavaScript tooltips </td>
</tr>
<tr>
<td align="left" valign="top">tooltipIconPath</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Icon path used for image that will have the tooltip</td>
</tr>
<tr>
<td align="left" valign="top">type</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">text</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Specifies the html5 type element to display. e.g. text, email, url</td>
</tr>
<tr>
<td align="left" valign="top">value</td>
<td align="left" valign="top">false</td>
<td align="left" valign="top"></td>
<td align="left" valign="top">false</td>
<td align="left" valign="top">String</td>
<td align="left" valign="top">Preset the value of input element.</td>
</tr>
</table>
<h2 id="examples">Examples</h2>
<h3 id="jsp">JSP:</h3>
<pre><code class="language-jsp">&lt;-- Example One --&gt;
&lt;s:bean name="struts.util.Counter" var="year"&gt;
&lt;s:param name="first" value="text('firstBirthYear')"/&gt;
&lt;s:param name="last" value="2000"/&gt;
&lt;s:combobox label="Birth year" size="6" maxlength="4" name="birthYear" list="#year"/&gt;
&lt;/s:bean&gt;
&lt;-- Example Two --&gt;
&lt;s:combobox
label="My Favourite Fruit"
name="myFavouriteFruit"
list="{'apple','banana','grape','pear'}"
headerKey="-1"
headerValue="--- Please Select ---"
emptyOption="true"
value="banana" /&gt;
&lt;-- Example Two --&gt;
&lt;s:combobox
label="My Favourite Color"
name="myFavouriteColor"
list="#{'red':'red','green':'green','blue':'blue'}"
headerKey="-1"
headerValue="--- Please Select ---"
emptyOption="true"
value="green" /&gt;
</code></pre>
<h3 id="velocity">Velocity:</h3>
<div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>#tag( ComboBox "label=Birth year" "size=6" "maxlength=4" "name=birthYear" "list=#year" )
</code></pre></div></div>
</section>
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