Description
{% comment %}start snippet id=javadoc|javadoc=true|url=org.apache.struts2.components.GenericUIBean {% endcomment %}
Renders an custom UI widget using the specified templates. Additional objects can be passed in to the template using the param tags.
Objects provided can be retrieve from within the template via $parameters._paramname_.
Objects provided can be retrieve from within the template via <s:property value="%{parameters._paramname_}" />
In the bottom JSP and Velocity samples, two parameters are being passed in to the component. From within the component, they can be accessed as:
$parameters.get('key1') and $parameters.get('key2') or $parameters.key1 and $parameters.key2
<s:property value="%{parameters.key1}" /> and <s:property value="%{'parameters.key2'}" /> or <s:property value="%{parameters.get('key1')}" /> and <s:property value="%{parameters.get('key2')}" />
Currently, your custom UI components can be written in Velocity, JSP, or Freemarker, and the correct rendering engine will be found based on file extension.
Remember: the value params will always be resolved against the ValueStack so if you mean to pass a string literal to your component, make sure to wrap it in single quotes i.e. value="'value1'" (note the opening "' and closing '" otherwise, the value stack will search for an Object on the stack with a method of getValue1().
{% comment %}end snippet id=javadoc|javadoc=true|url=org.apache.struts2.components.GenericUIBean {% endcomment %}
{% comment %}start snippet id=note|javadoc=true|url=org.apache.struts2.components.GenericUIBean {% endcomment %}
If JSP is used as the template, the JSP template itself must lie within the webapp itself and not the classpath. Unlike Freemarker or Velocity, JSP template could not be picked up from the classpath.
{% comment %}end snippet id=note|javadoc=true|url=org.apache.struts2.components.GenericUIBean {% endcomment %}
(!) templateDir and theme attribute
The final path to the template will be built using the templateDir and template attributes, like ${templateDir}/${theme}/${template}. If for example your component is under /components/html/option.jsp, you would have to set templateDir=“components”, theme=“html” and template=“options.jsp”.
For any Struts tag that you use in your component, make sure that you set its templateDir=“template”
Parameters
{% comment %}start snippet id=tagattributes|javadoc=false|url=struts2-tags/component.html {% endcomment %}
<tr> <td colspan="6"><h4>Dynamic Attributes Allowed:</h4> false</td> </tr> <tr> <td colspan="6"> </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">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">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">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">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">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">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>
Examples
{% comment %}start snippet id=example|lang=xml|javadoc=true|url=org.apache.struts2.components.GenericUIBean {% endcomment %}
<s:component template="/my/custom/component.vm"/>
or
<s:component template="/my/custom/component.vm">
<s:param name="key1" value="value1"/>
<s:param name="key2" value="value2"/>
</s:component>
#s-component( "template=/my/custom/component.vm" )
or
#s-component( "template=/my/custom/component.vm" )
#s-param( "name=key1" "value=value1" )
#s-param( "name=key2" "value=value2" )
#end
<@s..component template="/my/custom/component.ftl" />
or
<@s..component template="/my/custom/component.ftl">
<@s..param name="key1" value="%{'value1'}" />
<@s..param name="key2" value="%{'value2'}" />
</@s..component>
{% comment %}end snippet id=example|lang=xml|javadoc=true|url=org.apache.struts2.components.GenericUIBean {% endcomment %}