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## 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 successfull 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 ... />

Field Summary
`protected String` | `acceptcharset`
`protected String` | `action`
`protected Configuration` | `configuration`
`protected boolean` | `enableDynamicMethodInvocation`
`protected String` | `enctype`
`protected String` | `method`
`protected String` | `namespace`
`protected ObjectFactory` | `objectFactory`
`protected String` | `onsubmit`
`static String` | `OPEN_TEMPLATE`
`protected String` | `portletMode`
`private int` | `sequence`
`protected String` | `target`
`static String` | `TEMPLATE`
`protected String` | `validate`
`protected String` | `windowState`

Fields inherited from class org.apache.struts2.components.ClosingUIBean
`openTemplate`

Fields inherited from class org.apache.struts2.components.UIBean
`accesskey, cssClass, cssStyle, defaultTemplateDir, defaultUITheme, disabled, key, label, labelPosition, name, onblur, onchange, onclick, ondblclick, onfocus, onkeydown, onkeypress, onkeyup, onmousedown, onmousemove, onmouseout, onmouseover, onmouseup, onselect, request, required, requiredposition, response, tabindex, template, templateDir, templateEngineManager, templateSuffix, theme, title, tooltip, tooltipConfig, value`

Fields inherited from class org.apache.struts2.components.Component
`actionMapper, COMPONENT_STACK, id, parameters, stack`

Constructor Summary
`Form(ValueStack stack, HttpServletRequest request, HttpServletResponse response)`

Method Summary
`private void` | `evaluateClientSideJsEnablement(String actionName, String namespace, String actionMethod)`
`protected void` | `evaluateExtraParams()`
`private void` | `evaluateExtraParamsPortletRequest(String namespace, String action)` Constructs the action url adapted to a portal environment.
`private void` | `evaluateExtraParamsServletRequest(String action, String namespace, boolean isAjax)`
`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 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` | `setConfiguration(Configuration configuration)`
`void` | `setEnableDynamicMethodInvocation(String enable)`
`void` | `setEnctype(String enctype)`
`void` | `setMethod(String method)`
`void` | `setNamespace(String namespace)`
`void` | `setObjectFactory(ObjectFactory objectFactory)`
`void` | `setOnsubmit(String onsubmit)`
`void` | `setPortletMode(String portletMode)`
`void` | `setTarget(String target)`
`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, enableAncestorFormCustomOnsubmit, end, escape, evaluateParams, getTemplate, getTemplateDir, getTheme, getTooltipConfig, getValueClassType, mergeTemplate, setAccesskey, setCssClass, setCssStyle, setDefaultTemplateDir, setDefaultUITheme, setDisabled, setKey, setLabel, setLabelposition, setName, setOnblur, setOnchange, setOnclick, setOndblclick, setOnfocus, setOnkeydown, setOnkeypress, setOnkeyup, setOnmousedown, setOnmousemove, setOnmouseout, setOnmouseover, setOnmouseup, setOnselect, setRequired, setRequiredposition, setTabindex, setTemplate, setTemplateDir, setTemplateEngineManager, setTheme, setTitle, setTooltip, setTooltipConfig, setValue`

Methods inherited from class org.apache.struts2.components.Component
`addAllParameters, addParameter, altSyntax, copyParams, determineActionURL, determineNamespace, end, fieldError, findAncestor, findString, findString, findValue, findValue, findValue, getComponentStack, getId, getParameters, getStack, popComponentStack, setActionMapper, setId, 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

### sequence

    private int sequence

### onsubmit

    protected String onsubmit

### 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

### enableDynamicMethodInvocation

    protected boolean enableDynamicMethodInvocation

### configuration

    protected Configuration configuration

### objectFactory

    protected ObjectFactory objectFactory

Constructor Detail

### Form

    public Form(ValueStack stack,
                HttpServletRequest request,
                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.

### setEnableDynamicMethodInvocation

    public void setEnableDynamicMethodInvocation(String enable)

### setConfiguration

    public void setConfiguration(Configuration configuration)

### setObjectFactory

    public void setObjectFactory(ObjectFactory objectFactory)

### 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`

### evaluateExtraParamsServletRequest

    private void evaluateExtraParamsServletRequest(String action,
                                                   String namespace,
                                                   boolean isAjax)

  Parameters:
    `isAjax` -
    `namespace` -
    `action` -

### evaluateClientSideJsEnablement

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

### evaluateExtraParamsPortletRequest

    private void evaluateExtraParamsPortletRequest(String namespace,
                                                   String action)

  Constructs the action url adapted to a portal environment.

  Parameters:
    `action` - The action to create the URL for.

### getValidators

    public List getValidators(String name)

### 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)

### 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)

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