org.apache.struts2.components

## Class Form

- java.lang.Object
- - org.apache.struts2.components.Component
  - - org.apache.struts2.components.UIBean
    - - org.apache.struts2.components.ClosingUIBean
      - - org.apache.struts2.components.Form

-     public class Form
      extends ClosingUIBean

  Renders HTML an input form.

  The remote form allows the form to be submitted without the page being refreshed. The results from the form can be inserted into any HTML element on the page.

  NOTE:
  The order / logic in determining the posting url of the generated HTML form is as follows:

  1. If the action attribute is not specified, then the current request will be used to determine the posting url
  2. If the action is given, Struts will try to obtain an ActionConfig. This will be successful if the action attribute is a valid action alias defined struts.xml.
  3. If the action is given and is not an action alias defined in struts.xml, Struts will used the action attribute as if it is the posting url, separting the namespace from it and using UrlHelper to generate the final url.

  Examples

       <s:form ... />

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `Form.FieldVisitorValidatorWrapper` Wrap field validator, add visitor's field prefix to the field name.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected String` | `acceptcharset`
    `protected String` | `action`
    `protected ActionValidatorManager` | `actionValidatorManager`
    `protected Configuration` | `configuration`
    `protected String` | `enctype`
    `protected String` | `focusElement`
    `protected boolean` | `includeContext`
    `protected String` | `method`
    `protected String` | `namespace`
    `protected ObjectFactory` | `objectFactory`
    `protected String` | `onreset`
    `protected String` | `onsubmit`
    `static String` | `OPEN_TEMPLATE`
    `protected String` | `portletMode`
    `protected String` | `target`
    `static String` | `TEMPLATE`
    `protected UrlRenderer` | `urlRenderer`
    `protected String` | `validate`
    `protected String` | `windowState`

    - ### Fields inherited from class org.apache.struts2.components.UIBean

      `accesskey, 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, uiThemeExpansionToken, value`

    - ### Fields inherited from class org.apache.struts2.components.Component

      `actionMapper, COMPONENT_STACK, devMode, parameters, stack, standardAttributesMap, throwExceptionOnELFailure`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Form(ValueStack stack, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected void` | `evaluateClientSideJsEnablement(String actionName, String namespace, String actionMethod)` Evaluate client side JavaScript Enablement.
    `protected void` | `evaluateExtraParams()`
    `protected boolean` | `evaluateNameValue()`
    `String` | `getDefaultOpenTemplate()`
    `protected String` | `getDefaultTemplate()` A contract that requires each concrete UI Tag to specify which template should be used as a default.
    `protected int` | `getSequence()` Get a incrementing sequence unique to this `Form` component.
    `List` | `getValidators(String name)`
    `protected Class` | `getVisitorReturnType(Class actionClass, String visitorFieldName)` Return type of visited object.
    `protected void` | `populateComponentHtmlId(Form form)` Form component determine the its HTML element id as follows:- if an 'id' attribute is specified. if an 'action' attribute is specified, it will be used as the id.
    `void` | `setAcceptcharset(String acceptcharset)`
    `void` | `setAction(String action)`
    `void` | `setActionValidatorManager(ActionValidatorManager mgr)`
    `void` | `setConfiguration(Configuration configuration)`
    `void` | `setEnctype(String enctype)`
    `void` | `setFocusElement(String focusElement)`
    `void` | `setIncludeContext(boolean includeContext)`
    `void` | `setMethod(String method)`
    `void` | `setNamespace(String namespace)`
    `void` | `setObjectFactory(ObjectFactory objectFactory)`
    `void` | `setOnreset(String onreset)`
    `void` | `setOnsubmit(String onsubmit)`
    `void` | `setPortletMode(String portletMode)`
    `void` | `setTarget(String target)`
    `void` | `setUrlRenderer(UrlRenderer urlRenderer)`
    `void` | `setValidate(String validate)`
    `void` | `setWindowState(String windowState)`

    - ### Methods inherited from class org.apache.struts2.components.ClosingUIBean

      `setOpenTemplate, start`

    - ### Methods inherited from class org.apache.struts2.components.UIBean

      `addFormParameter, buildTemplateName, copyParams, enableAncestorFormCustomOnsubmit, end, ensureAttributeSafelyNotEscaped, escape, evaluateParams, getId, getTemplate, getTemplateDir, getTheme, getTooltipConfig, getValueClassType, mergeTemplate, setAccesskey, setClass, 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, setStyle, setTabindex, setTemplate, setTemplateDir, setTemplateEngineManager, setTheme, setTitle, setTooltip, setTooltipConfig, setTooltipCssClass, setTooltipDelay, setTooltipIconPath, setUIThemeExpansionToken, setValue`

    - ### Methods inherited from class org.apache.struts2.components.Component

      `addAllParameters, addParameter, altSyntax, completeExpressionIfAltSyntax, determineActionURL, determineNamespace, end, fieldError, findAncestor, findString, findString, findStringIfAltSyntax, findValue, findValue, findValue, getComponentStack, getParameters, getStack, getStandardAttributes, isValidTagAttribute, popComponentStack, setActionMapper, setDevMode, setThrowExceptionsOnELFailure, setUrlHelper, stripExpressionIfAltSyntax, toString, usesBody`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### OPEN_TEMPLATE

          public static final String OPEN_TEMPLATE

      See Also:
        Constant Field Values

    - #### TEMPLATE

          public static final String TEMPLATE

      See Also:
        Constant Field Values

    - #### onsubmit

          protected String onsubmit

    - #### onreset

          protected String onreset

    - #### action

          protected String action

    - #### target

          protected String target

    - #### enctype

          protected String enctype

    - #### method

          protected String method

    - #### namespace

          protected String namespace

    - #### validate

          protected String validate

    - #### portletMode

          protected String portletMode

    - #### windowState

          protected String windowState

    - #### acceptcharset

          protected String acceptcharset

    - #### includeContext

          protected boolean includeContext

    - #### focusElement

          protected String focusElement

    - #### configuration

          protected Configuration configuration

    - #### objectFactory

          protected ObjectFactory objectFactory

    - #### urlRenderer

          protected UrlRenderer urlRenderer

    - #### actionValidatorManager

          protected ActionValidatorManager actionValidatorManager

  - ### Constructor Detail

    - #### Form

          public Form(ValueStack stack,
              javax.servlet.http.HttpServletRequest request,
              javax.servlet.http.HttpServletResponse response)

  - ### Method Detail

    - #### evaluateNameValue

          protected boolean evaluateNameValue()

      Overrides:
        `evaluateNameValue` in class `UIBean`

    - #### getDefaultOpenTemplate

          public String getDefaultOpenTemplate()

      Specified by:
        `getDefaultOpenTemplate` in class `ClosingUIBean`

    - #### getDefaultTemplate

          protected String getDefaultTemplate()

      Description copied from class: `UIBean`
      A 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.
      Specified by:
        `getDefaultTemplate` in class `UIBean`
      Returns:
        The name of the template to be used as the default.

    - #### setConfiguration

          public void setConfiguration(Configuration configuration)

    - #### setObjectFactory

          public void setObjectFactory(ObjectFactory objectFactory)

    - #### setUrlRenderer

          public void setUrlRenderer(UrlRenderer urlRenderer)

    - #### setActionValidatorManager

          public void setActionValidatorManager(ActionValidatorManager mgr)

    - #### evaluateExtraParams

          protected void evaluateExtraParams()

      Overrides:
        `evaluateExtraParams` in class `UIBean`

    - #### populateComponentHtmlId

          protected void populateComponentHtmlId(Form form)

      Form component determine the its HTML element id as follows:-
      1. if an 'id' attribute is specified.
      2. if an 'action' attribute is specified, it will be used as the id.
      Overrides:
        `populateComponentHtmlId` in class `UIBean`
      Parameters:
        `form` - enclosing form tag

    - #### evaluateClientSideJsEnablement

          protected void evaluateClientSideJsEnablement(String actionName,
                                            String namespace,
                                            String actionMethod)

      Evaluate client side JavaScript Enablement.
      Parameters:
        `actionName` - the actioName to check for
        `namespace` - the namespace to check for
        `actionMethod` - the method to ckeck for

    - #### getValidators

          public List getValidators(String name)

    - #### getVisitorReturnType

          protected Class getVisitorReturnType(Class actionClass,
                                   String visitorFieldName)

      Return type of visited object.
      Parameters:
        `actionClass` - action class
        `visitorFieldName` - field name
      Returns:
        type of visited object

    - #### getSequence

          protected int getSequence()

      Get a incrementing sequence unique to this `Form` component. It is used by `Form` component's child that might need a sequence to make them unique.
      Returns:
        int

    - #### setOnsubmit

          public void setOnsubmit(String onsubmit)

    - #### setOnreset

          public void setOnreset(String onreset)

    - #### setAction

          public void setAction(String action)

    - #### setTarget

          public void setTarget(String target)

    - #### setEnctype

          public void setEnctype(String enctype)

    - #### setMethod

          public void setMethod(String method)

    - #### setNamespace

          public void setNamespace(String namespace)

    - #### setValidate

          public void setValidate(String validate)

    - #### setPortletMode

          public void setPortletMode(String portletMode)

    - #### setWindowState

          public void setWindowState(String windowState)

    - #### setAcceptcharset

          public void setAcceptcharset(String acceptcharset)

    - #### setFocusElement

          public void setFocusElement(String focusElement)

    - #### setIncludeContext

          public void setIncludeContext(boolean includeContext)

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