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CheckboxTag (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 CheckboxTag

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.AbstractHtmlInputElementTag
                              extended by org.springframework.web.servlet.tags.form.CheckboxTag
All Implemented Interfaces:
Serializable, IterationTag, JspTag, Tag, TryCatchFinally
public class CheckboxTag
extends AbstractHtmlInputElementTag

Databinding-aware JSP tag for rendering an HTML 'input' element with a 'type' of 'checkbox'.

May be used in one of three different approaches depending on the type of the bound value.

Approach One

When the bound value is of type Boolean then the 'input(checkbox)' is marked as 'checked' if the bound value is true. The 'value' attribute corresponds to the resolved value of the value property.

Approach Two

When the bound value is of type Collection then the 'input(checkbox)' is marked as 'checked' if the configured value is present in the bound Collection.

Approach Three

For any other bound value type, the 'input(checkbox)' is marked as 'checked' if the the configured value is equal to the bound value.

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

Field Summary
 
Fields inherited from class org.springframework.web.servlet.tags.form.AbstractHtmlInputElementTag
ACCESSKEY_ATTRIBUTE, DISABLED_ATTRIBUTE, ONBLUR_ATTRIBUTE, ONCHANGE_ATTRIBUTE, ONFOCUS_ATTRIBUTE, READONLY_ATTRIBUTE
 
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.IterationTag
EVAL_BODY_AGAIN
 
Fields inherited from interface javax.servlet.jsp.tagext.Tag
EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE
 
Constructor Summary
CheckboxTag()
           
 
Method Summary
protected  String autogenerateId()
          Return a unique ID for the bound name within the current PageContext.
protected  Object getValue()
          Get the value of the 'value' attribute.
 void setValue(Object value)
          Set the value of the 'value' attribute.
protected  int writeTagContent(TagWriter tagWriter)
          Writes the 'input(checkbox)' to the supplied TagWriter, marking it as 'checked' if appropriate.
 
Methods inherited from class org.springframework.web.servlet.tags.form.AbstractHtmlInputElementTag
getAccesskey, getDisabled, getOnblur, getOnchange, getOnfocus, getReadonly, isDisabled, isReadonly, setAccesskey, setDisabled, setOnblur, setOnchange, setOnfocus, setReadonly, writeDefaultAttributes
 
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
 
Methods inherited from class org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag
doFinally, getBindStatus, getBoundValue, getCompletePath, getId, getName, 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, doEndTag, 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
 

Constructor Detail

CheckboxTag

public CheckboxTag()
Method Detail

setValue

public void setValue(Object value)
Set the value of the 'value' attribute. May be a runtime expression.

getValue

protected Object getValue()
Get the value of the 'value' attribute. May be a runtime expression.

writeTagContent

protected int writeTagContent(TagWriter tagWriter)
                       throws JspException
Writes the 'input(checkbox)' to the supplied TagWriter, marking it as 'checked' if appropriate.

Specified by:
writeTagContent in class AbstractFormTag
Returns:
valid tag render instruction as per Tag.doStartTag().
Throws:
JspException

autogenerateId

protected String autogenerateId()
                         throws JspException
Return a unique ID for the bound name within the current PageContext.

Overrides:
autogenerateId in class AbstractDataBoundFormElementTag
Throws:
JspException
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