Class ComboBox
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.
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 <form>.
Note that unlike the <s:select/> tag, there is no ability to define the individual <option> 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.
Examples
 
 JSP:
 <-- Example One -->
 <s:bean name="struts.util.Counter" var="year">
   <s:param name="first" value="text('firstBirthYear')"/>
   <s:param name="last" value="2000"/>
   <s:combobox label="Birth year" size="6" maxlength="4" name="birthYear" list="#year"/>
 </s:bean>
 <-- Example Two -->
 <s:combobox
     label="My Favourite Fruit"
     name="myFavouriteFruit"
     list="{'apple','banana','grape','pear'}"
     headerKey="-1"
     headerValue="--- Please Select ---"
     emptyOption="true"
     value="banana" />
 <-- Example Two -->
 <s:combobox
    label="My Favourite Color"
    name="myFavouriteColor"
    list="#{'red':'red','green':'green','blue':'blue'}"
    headerKey="-1"
    headerValue="--- Please Select ---"
    emptyOption="true"
    value="green" />
 Velocity:
 #tag( ComboBox "label=Birth year" "size=6" "maxlength=4" "name=birthYear" "list=#year" )
 
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Field SummaryFieldsModifier and TypeFieldDescriptionprotected Stringprotected Stringprotected Stringprotected Stringprotected Stringprotected Stringstatic final StringFields inherited from class org.apache.struts2.components.UIBeanaccesskey, ATTR_FIELD_VALUE, ATTR_NAME_VALUE, ATTR_VALUE, cssClass, cssErrorClass, cssErrorStyle, cssStyle, defaultTemplateDir, defaultUITheme, disabled, dynamicAttributes, errorPosition, id, javascriptTooltip, key, label, labelPosition, labelSeparator, name, onblur, onchange, onclick, ondblclick, onfocus, onkeydown, onkeypress, onkeyup, onmousedown, onmousemove, onmouseout, onmouseover, onmouseup, onselect, request, requiredLabel, requiredPosition, response, tabindex, template, templateDir, templateEngineManager, templateSuffix, theme, title, tooltip, tooltipConfig, tooltipCssClass, tooltipDelay, tooltipIconPath, uiStaticContentPath, uiThemeExpansionToken, valueFields inherited from class org.apache.struts2.components.ComponentactionMapper, attributes, COMPONENT_STACK, devMode, escapeHtmlBody, performClearTagStateForTagPoolingServers, stack, standardAttributesMap, throwExceptionOnELFailure
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Constructor SummaryConstructorsConstructorDescriptionComboBox(ValueStack stack, jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response) 
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Method SummaryModifier and TypeMethodDescriptionvoidprotected Objectprotected StringA contract that requires each concrete UI Tag to specify which template should be used as a default.voidsetEmptyOption(String emptyOption) voidsetHeaderKey(String headerKey) voidsetHeaderValue(String headerValue) voidvoidsetListKey(String listKey) voidsetListValue(String listValue) Methods inherited from class org.apache.struts2.components.TextFieldsetMaxlength, setMaxLength, setReadonly, setSize, setTypeMethods inherited from class org.apache.struts2.components.UIBeanaddFormParameter, applyValueParameter, buildTemplateName, copyAttributes, enableAncestorFormCustomOnsubmit, end, ensureAttributeSafelyNotEscaped, escape, evaluateNameValue, evaluateParams, getId, getTemplate, getTemplateDir, getTheme, getTooltipConfig, getValueClassType, lazyEvaluation, mergeTemplate, populateComponentHtmlId, setAccesskey, setCssClass, setCssErrorClass, setCssErrorStyle, setCssStyle, setDefaultTemplateDir, setDefaultUITheme, setDisabled, setDynamicAttributes, setErrorPosition, setId, setJavascriptTooltip, setKey, setLabel, setLabelPosition, setLabelSeparator, setName, setOnblur, setOnchange, setOnclick, setOndblclick, setOnfocus, setOnkeydown, setOnkeypress, setOnkeyup, setOnmousedown, setOnmousemove, setOnmouseout, setOnmouseover, setOnmouseup, setOnselect, setRequiredLabel, setRequiredPosition, setStaticContentPath, setStyle, setTabindex, setTemplate, setTemplateDir, setTemplateEngineManager, setTheme, setTitle, setTooltip, setTooltipConfig, setTooltipCssClass, setTooltipDelay, setTooltipIconPath, setUIThemeExpansionToken, setValueMethods inherited from class org.apache.struts2.components.ComponentaddAllAttributes, addParameter, completeExpression, determineActionURL, determineNamespace, end, escapeHtmlBody, fieldError, findAncestor, findString, findString, findValue, findValue, findValue, getAttributes, getComponentStack, getNamespace, getPerformClearTagStateForTagPoolingServers, getStack, getStandardAttributes, isAcceptableExpression, isValidTagAttribute, popComponentStack, setActionMapper, setDevMode, setEscapeHtmlBody, setNotExcludedAcceptedPatterns, setPerformClearTagStateForTagPoolingServers, setThrowExceptionsOnELFailure, setUrlHelper, start, stripExpression, toString, usesBody
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Field Details- 
TEMPLATE- See Also:
 
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list
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listKey
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listValue
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headerKey
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headerValue
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emptyOption
 
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Constructor Details- 
ComboBoxpublic ComboBox(ValueStack stack, jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response) 
 
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Method Details- 
getDefaultTemplateDescription copied from class:UIBeanA contract that requires each concrete UI Tag to specify which template should be used as a default. For example, the CheckboxTab might return "checkbox.vm" while the RadioTag might return "radio.vm". This value not begin with a '/' unless you intend to make the path absolute rather than relative to the current theme.- Overrides:
- getDefaultTemplatein class- TextField
- Returns:
- The name of the template to be used as the default.
 
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evaluateExtraParamspublic void evaluateExtraParams()- Overrides:
- evaluateExtraParamsin class- TextField
 
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findListValue
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setList
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setEmptyOption
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setHeaderKey
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setHeaderValue
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setListKey
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setListValue
 
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