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ErrorsTag (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.web.servlet.tags.form
Class ErrorsTag

java.lang.Object
  extended by javax.servlet.jsp.tagext.TagSupport
      extended by org.springframework.web.servlet.tags.RequestContextAwareTag
          extended by org.springframework.web.servlet.tags.HtmlEscapingAwareTag
              extended by org.springframework.web.servlet.tags.form.AbstractFormTag
                  extended by org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag
                      extended by org.springframework.web.servlet.tags.form.AbstractHtmlElementTag
                          extended by org.springframework.web.servlet.tags.form.AbstractHtmlElementBodyTag
                              extended by org.springframework.web.servlet.tags.form.ErrorsTag
All Implemented Interfaces:
Serializable, BodyTag, IterationTag, JspTag, Tag, TryCatchFinally
public class ErrorsTag
extends AbstractHtmlElementBodyTag
implements BodyTag

Form tag for displaying errors for a particular field or object.

This tag supports three main usage patterns:

  1. Field only - set 'path' to the field name (or path)
  2. Object errors only - omit 'path'
  3. All errors - set 'path' to '*'

Since:
2.0
Author:
Rob Harrop, Juergen Hoeller, Rick Evans
See Also:
Serialized Form

Field Summary
static String MESSAGES_ATTRIBUTE
          The key under which this tag exposes error messages in the page context scope.
static String SPAN_TAG
          The HTML 'span' tag.
 
Fields inherited from class org.springframework.web.servlet.tags.form.AbstractHtmlElementTag
CLASS_ATTRIBUTE, DIR_ATTRIBUTE, LANG_ATTRIBUTE, ONCLICK_ATTRIBUTE, ONDBLCLICK_ATTRIBUTE, ONKEYDOWN_ATTRIBUTE, ONKEYPRESS_ATTRIBUTE, ONKEYUP_ATTRIBUTE, ONMOUSEDOWN_ATTRIBUTE, ONMOUSEMOVE_ATTRIBUTE, ONMOUSEOUT_ATTRIBUTE, ONMOUSEOVER_ATTRIBUTE, ONMOUSEUP_ATTRIBUTE, STYLE_ATTRIBUTE, TABINDEX_ATTRIBUTE, TITLE_ATTRIBUTE
 
Fields inherited from class org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag
COMMAND_NAME_ATTRIBUTE, COMMAND_NAME_VARIABLE_NAME, ID_ATTRIBUTE
 
Fields inherited from class org.springframework.web.servlet.tags.RequestContextAwareTag
logger, REQUEST_CONTEXT_PAGE_ATTRIBUTE
 
Fields inherited from class javax.servlet.jsp.tagext.TagSupport
pageContext
 
Fields inherited from interface javax.servlet.jsp.tagext.BodyTag
EVAL_BODY_BUFFERED, EVAL_BODY_TAG
 
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
ErrorsTag()
           
 
Method Summary
protected  String autogenerateId()
          Get the value for the HTML 'id' attribute.
protected  void exposeAttributes()
          Exposes any bind status error messages under this key in the PageContext.PAGE_SCOPE.
 String getDelimiter()
          Return the delimiter to be used between error messages.
 String getElement()
          Get the HTML element must be used to render the error messages.
protected  String getName()
          Get the value for the HTML 'name' attribute.
protected  void removeAttributes()
          Removes any bind status error messages that were previously stored under this key in the PageContext.PAGE_SCOPE.
protected  void renderDefaultContent(TagWriter tagWriter)
           
 void setDelimiter(String delimiter)
          Set the delimiter to be used between error messages.
 void setElement(String element)
          Set the HTML element must be used to render the error messages.
protected  boolean shouldRender()
          Should rendering of this tag proceed at all?
 
Methods inherited from class org.springframework.web.servlet.tags.form.AbstractHtmlElementBodyTag
doEndTag, doFinally, doInitBody, flushBufferedBodyContent, onWriteTagContent, renderFromBodyContent, setBodyContent, writeTagContent
 
Methods inherited from class org.springframework.web.servlet.tags.form.AbstractHtmlElementTag
getCssClass, getCssErrorClass, getCssStyle, getDir, getLang, getOnclick, getOndblclick, getOnkeydown, getOnkeypress, getOnkeyup, getOnmousedown, getOnmousemove, getOnmouseout, getOnmouseover, getOnmouseup, getTabindex, getTitle, resolveCssClass, setCssClass, setCssErrorClass, setCssStyle, setDir, setLang, setOnclick, setOndblclick, setOnkeydown, setOnkeypress, setOnkeyup, setOnmousedown, setOnmousemove, setOnmouseout, setOnmouseover, setOnmouseup, setTabindex, setTitle, writeDefaultAttributes
 
Methods inherited from class org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag
getBindStatus, getBoundValue, getCompletePath, getId, getNestedPath, getPath, getPropertyEditor, setId, setPath
 
Methods inherited from class org.springframework.web.servlet.tags.form.AbstractFormTag
createTagWriter, doStartTagInternal, evaluate, getDisplayString, getDisplayString, writeOptionalAttribute
 
Methods inherited from class org.springframework.web.servlet.tags.HtmlEscapingAwareTag
isHtmlEscape, 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, getParent, getValue, getValues, release, removeValue, setPageContext, setParent, setValue
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface javax.servlet.jsp.tagext.BodyTag
doInitBody, setBodyContent
 
Methods inherited from interface javax.servlet.jsp.tagext.IterationTag
doAfterBody
 
Methods inherited from interface javax.servlet.jsp.tagext.Tag
doEndTag, doStartTag, getParent, release, setPageContext, setParent
 

Field Detail

MESSAGES_ATTRIBUTE

public static final String MESSAGES_ATTRIBUTE
The key under which this tag exposes error messages in the page context scope.

See Also:
Constant Field Values

SPAN_TAG

public static final String SPAN_TAG
The HTML 'span' tag.

See Also:
Constant Field Values
Constructor Detail

ErrorsTag

public ErrorsTag()
Method Detail

setElement

public void setElement(String element)
Set the HTML element must be used to render the error messages.

Defaults to an HTML '<span/>' tag.

getElement

public String getElement()
Get the HTML element must be used to render the error messages.

setDelimiter

public void setDelimiter(String delimiter)
Set the delimiter to be used between error messages.

Defaults to an HTML '<br/>' tag.

getDelimiter

public String getDelimiter()
Return the delimiter to be used between error messages.

getName

protected String getName()
                  throws JspException
Get the value for the HTML 'name' attribute.

Simply returns "" (the empty string) because the 'name' attribute is not a validate attribute for the 'span' element.

Overrides:
getName in class AbstractDataBoundFormElementTag
Returns:
the value for the HTML 'name' attribute
Throws:
JspException

autogenerateId

protected String autogenerateId()
                         throws JspException
Get the value for the HTML 'id' attribute.

Appends '.errors' to the value returned by AbstractDataBoundFormElementTag.getCompletePath().

Overrides:
autogenerateId in class AbstractDataBoundFormElementTag
Returns:
the value for the HTML 'name' attribute
Throws:
JspException
See Also:
AbstractDataBoundFormElementTag.getPath()

shouldRender

protected boolean shouldRender()
                        throws JspException
Should rendering of this tag proceed at all?

Only renders output when there are errors for the configured path.

Overrides:
shouldRender in class AbstractHtmlElementBodyTag
Returns:
true only when there are errors for the configured path
Throws:
JspException

renderDefaultContent

protected void renderDefaultContent(TagWriter tagWriter)
                             throws JspException
Specified by:
renderDefaultContent in class AbstractHtmlElementBodyTag
Throws:
JspException

exposeAttributes

protected void exposeAttributes()
                         throws JspException
Exposes any bind status error messages under this key in the PageContext.PAGE_SCOPE.

Only called if shouldRender() returns true.

Overrides:
exposeAttributes in class AbstractHtmlElementBodyTag
Throws:
JspException
See Also:
removeAttributes()

removeAttributes

protected void removeAttributes()
Removes any bind status error messages that were previously stored under this key in the PageContext.PAGE_SCOPE.

Overrides:
removeAttributes in class AbstractHtmlElementBodyTag
See Also:
exposeAttributes()
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