org.apache.tapestry5.corelib.base

Class AbstractField

java.lang.Object

org.apache.tapestry5.corelib.base.AbstractField

All Implemented Interfaces:

ClientElement, Field

Direct Known Subclasses:

AbstractTextField, Checkbox, Checklist, DateField, KaptchaField, Palette, Select, Upload

@SupportsInformalParameters
public abstract class AbstractField
extends Object
implements Field

Provides initialization of the clientId and elementName properties. In addition, adds the RenderInformals, and DiscardBody mixins.

Component Parameters

Name	Type	Flags	Default	Default Prefix
clientId	String			literal
	Used to explicitly set the client-side id of the element for this component. Normally this is not bound (or null) and org.apache.tapestry5.services.javascript.JavaScriptSupport#allocateClientId(org.apache.tapestry5.ComponentResources) is used to generate a unique client-id based on the component's id. In some cases, when creating client-side behaviors, it is useful to explicitly set a unique id for an element using this parameter. Certain values, such as "submit", "method", "reset", etc., will cause client-side conflicts and are not allowed; using such will cause a runtime exception.
ensureClientIdUnique	boolean	Since 5.4		prop
	A rarely used option that indicates that the actual client id should start with the clientId parameter (if non-null) but should still pass that Id through org.apache.tapestry5.services.javascript.JavaScriptSupport#allocateClientId(String) to generate the final id. An example of this are the components used inside a org.apache.tapestry5.corelib.components.BeanEditor which will specify a clientId (based on the property name) but still require that it be unique. Defaults to false.

Field Summary

Fields

Modifier and Type	Field and Description
protected String	cssClass
protected ValidationDecorator	decorator
protected ComponentDefaultProvider	defaultProvider
protected boolean	disabled If true, then the field will render out with a disabled attribute (to turn off client-side behavior).
protected Environment	environment
protected FieldValidationSupport	fieldValidationSupport
protected FormSupport	formSupport
protected JavaScriptSupport	javaScriptSupport
protected String	label The user presentable label for the field.
protected Request	request
protected ComponentResources	resources
protected ValidationTracker	validationTracker

Constructor Summary

Constructors

Constructor and Description
AbstractField()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	decorateInsideField() Invoked from subclasses after they have written their tag and (where appropriate) their informal parameters and have allowed their Validator to write markup as well.
String	getClientId() Returns a unique id for the element.
String	getControlName() Returns the value used as the name attribute of the rendered element.
String	getLabel() Returns a user presentable (localized) label for the field, which may be used inside <label> elements on the client, and inside client or server-side validation error messages.
boolean	isDisabled() Returns true if the field is disabled; A disabled field will render a disabled attribute so that it is non-responsive on the client (at least, until its disabled status is changed on the client using JavaScript).
boolean	isRequired() Returns false; most components do not support declarative validation.
protected abstract void	processSubmission(String controlName) Method implemented by subclasses to actually do the work of processing the submission of the form.
protected void	putPropertyNameIntoBeanValidationContext(String parameterName)
protected void	removePropertyNameFromBeanValidationContext()
protected void	setDecorator(ValidationDecorator decorator)
protected void	setFormSupport(FormSupport formSupport)

Methods inherited from class java.lang.Object

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

Field Detail

label

@Parameter(defaultPrefix="literal")
protected String label

The user presentable label for the field. If not provided, a reasonable label is generated from the component's id, first by looking for a message key named "id-label" (substituting the component's actual id), then by converting the actual id to a presentable string (for example, "userId" to "User Id").

disabled

@Parameter(value="false")
protected boolean disabled

If true, then the field will render out with a disabled attribute (to turn off client-side behavior). When the form is submitted, the bound value is evaluated again and, if true, the field's value is ignored (not even validated) and the component's events are not fired.

decorator

@Environmental
protected ValidationDecorator decorator

environment

@Inject
protected Environment environment

cssClass

@Inject
@Symbol(value="tapestry.form-field-css-class")
protected String cssClass

formSupport

@Environmental(value=false)
protected FormSupport formSupport

javaScriptSupport

@Environmental
protected JavaScriptSupport javaScriptSupport

validationTracker

@Environmental
protected ValidationTracker validationTracker

resources

@Inject
protected ComponentResources resources

defaultProvider

@Inject
protected ComponentDefaultProvider defaultProvider

request

@Inject
protected Request request

fieldValidationSupport

@Inject
protected FieldValidationSupport fieldValidationSupport

Constructor Detail

AbstractField

public AbstractField()

Method Detail

getLabel

public final String getLabel()

Description copied from interface: Field

Returns a user presentable (localized) label for the field, which may be used inside <label> elements on the client, and inside client or server-side validation error messages.

Specified by:

getLabel in interface Field

Returns:

the label

See Also:

Label

getClientId

public final String getClientId()

Description copied from interface: ClientElement

Returns a unique id for the element. This value will be unique for any given rendering of a page. This value is intended for use as the id attribute of the client-side element, and will be used with any DHTML/Ajax related JavaScript.

Specified by:

getClientId in interface ClientElement

getControlName

public final String getControlName()

Description copied from interface: Field

Returns the value used as the name attribute of the rendered element. This value will be unique within an enclosing form, even if the same component renders multiple times.

Specified by:

getControlName in interface Field

See Also:

FormSupport.allocateControlName(String)

isDisabled

public final boolean isDisabled()

Description copied from interface: Field

Returns true if the field is disabled; A disabled field will render a disabled attribute so that it is non-responsive on the client (at least, until its disabled status is changed on the client using JavaScript). A disabled field will ignore any value passed up in a form submit request. Care must be taken if the disabled status of a field can change between the time the field is rendered and the time the enclosing form is submitted.

Specified by:

isDisabled in interface Field

processSubmission

protected abstract void processSubmission(String controlName)

Method implemented by subclasses to actually do the work of processing the submission of the form. The element's controlName property will already have been set. This method is only invoked if the field is not disabled.

Parameters:

controlName - the control name of the rendered element (used to find the correct parameter in the request)

decorateInsideField

protected final void decorateInsideField()

Invoked from subclasses after they have written their tag and (where appropriate) their informal parameters and have allowed their Validator to write markup as well.

setDecorator

protected final void setDecorator(ValidationDecorator decorator)

setFormSupport

protected final void setFormSupport(FormSupport formSupport)

isRequired

public boolean isRequired()

Returns false; most components do not support declarative validation.

Specified by:

isRequired in interface Field

Returns:

true if a non-blank value is required for the field

putPropertyNameIntoBeanValidationContext

protected void putPropertyNameIntoBeanValidationContext(String parameterName)

removePropertyNameFromBeanValidationContext

protected void removePropertyNameFromBeanValidationContext()