org.springframework.web.servlet.tags

Class BindTag

java.lang.Object

javax.servlet.jsp.tagext.TagSupport

org.springframework.web.servlet.tags.RequestContextAwareTag

org.springframework.web.servlet.tags.HtmlEscapingAwareTag

org.springframework.web.servlet.tags.BindTag

All Implemented Interfaces:

Serializable, IterationTag, JspTag, Tag, TryCatchFinally, EditorAwareTag

public class BindTag
extends HtmlEscapingAwareTag
implements EditorAwareTag

Bind tag, supporting evaluation of binding errors for a certain bean or bean property. Exposes a "status" variable of type BindStatus, to both Java expressions and JSP EL expressions.

Can be used to bind to any bean or bean property in the model. The specified path determines whether the tag exposes the status of the bean itself (showing object-level errors), a specific bean property (showing field errors), or a matching set of bean properties (showing all corresponding field errors).

The Errors object that has been bound using this tag is exposed to collaborating tags, as well as the bean property that this errors object applies to. Nested tags such as the TransformTag can access those exposed properties.

Author:

Rod Johnson, Juergen Hoeller

See Also:

setPath(java.lang.String), Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static String	STATUS_VARIABLE_NAME Name of the exposed variable within the scope of this tag: "status".

Fields inherited from class org.springframework.web.servlet.tags.RequestContextAwareTag

logger, REQUEST_CONTEXT_PAGE_ATTRIBUTE

Fields inherited from class javax.servlet.jsp.tagext.TagSupport

id, pageContext

Fields inherited from interface javax.servlet.jsp.tagext.IterationTag

EVAL_BODY_AGAIN

Fields inherited from interface javax.servlet.jsp.tagext.Tag

EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE

Constructor Summary

Constructors

Constructor and Description
BindTag()

Method Summary

Modifier and Type	Method and Description
int	doEndTag()
void	doFinally()
protected int	doStartTagInternal() Called by doStartTag to perform the actual work.
PropertyEditor	getEditor() Retrieve the PropertyEditor for the property that this tag is currently bound to.
Errors	getErrors() Retrieve the Errors instance that this tag is currently bound to.
String	getPath() Return the path that this tag applies to.
String	getProperty() Retrieve the property that this tag is currently bound to, or null if bound to an object rather than a specific property.
boolean	isIgnoreNestedPath() Return whether to ignore a nested path, if any.
void	setIgnoreNestedPath(boolean ignoreNestedPath) Set whether to ignore a nested path, if any.
void	setPath(String path) Set the path that this tag should apply.

Methods inherited from class org.springframework.web.servlet.tags.HtmlEscapingAwareTag

htmlEscape, isDefaultHtmlEscape, isHtmlEscape, isResponseEncodedHtmlEscape, setHtmlEscape

Methods inherited from class org.springframework.web.servlet.tags.RequestContextAwareTag

doCatch, doStartTag, getRequestContext

Methods inherited from class javax.servlet.jsp.tagext.TagSupport

doAfterBody, findAncestorWithClass, getId, getParent, getValue, getValues, release, removeValue, setId, setPageContext, setParent, setValue

Methods inherited from class java.lang.Object

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

Field Detail

STATUS_VARIABLE_NAME

public static final String STATUS_VARIABLE_NAME

Name of the exposed variable within the scope of this tag: "status".

See Also:

Constant Field Values

Constructor Detail

BindTag

public BindTag()

Method Detail

setPath

public void setPath(String path)

Set the path that this tag should apply. Can be a bean (e.g. "person") to get global errors, or a bean property (e.g. "person.name") to get field errors (also supporting nested fields and "person.na*" mappings). "person.*" will return all errors for the specified bean, both global and field errors.

See Also:

Errors.getGlobalErrors(), Errors.getFieldErrors()

getPath

public String getPath()

Return the path that this tag applies to.

setIgnoreNestedPath

public void setIgnoreNestedPath(boolean ignoreNestedPath)

Set whether to ignore a nested path, if any. Default is to not ignore.

isIgnoreNestedPath

public boolean isIgnoreNestedPath()

Return whether to ignore a nested path, if any.

doStartTagInternal

protected final int doStartTagInternal()
                                throws Exception

Description copied from class: RequestContextAwareTag

Called by doStartTag to perform the actual work.

Specified by:

doStartTagInternal in class RequestContextAwareTag

Returns:

same as TagSupport.doStartTag

Throws:

Exception - any exception, any checked one other than a JspException gets wrapped in a JspException by doStartTag

See Also:

TagSupport.doStartTag()

doEndTag

public int doEndTag()

Specified by:

doEndTag in interface Tag

Overrides:

doEndTag in class TagSupport

getProperty

public final String getProperty()

Retrieve the property that this tag is currently bound to, or null if bound to an object rather than a specific property. Intended for cooperating nesting tags.

Returns:

the property that this tag is currently bound to, or null if none

getErrors

public final Errors getErrors()

Retrieve the Errors instance that this tag is currently bound to. Intended for cooperating nesting tags.

Returns:

the current Errors instance, or null if none

getEditor

public final PropertyEditor getEditor()

Description copied from interface: EditorAwareTag

Retrieve the PropertyEditor for the property that this tag is currently bound to. Intended for cooperating nesting tags.

Specified by:

getEditor in interface EditorAwareTag

Returns:

the current PropertyEditor, or null if none

doFinally

public void doFinally()

Specified by:

doFinally in interface TryCatchFinally

Overrides:

doFinally in class RequestContextAwareTag