Class EvalTag
- 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.EvalTag
- All Implemented Interfaces:
Serializable
,IterationTag
,JspTag
,Tag
,TryCatchFinally
public class EvalTag extends HtmlEscapingAwareTag
The<eval>
tag evaluates a Spring expression (SpEL) and either prints the result or assigns it to a variable. Supports the standard JSP evaluation context consisting of implicit variables and scoped attributes.Attribute Summary Attribute Required? Runtime Expression? Description expression true true The expression to evaluate. htmlEscape false true Set HTML escaping for this tag, as a boolean value. Overrides the default HTML escaping setting for the current page. javaScriptEscape false true Set JavaScript escaping for this tag, as a boolean value. Default is false. scope false true The scope for the var. 'application', 'session', 'request' and 'page' scopes are supported. Defaults to page scope. This attribute has no effect unless the var attribute is also defined. var false true The name of the variable to export the evaluation result to. If not specified the evaluation result is converted to a String and written as output. - Since:
- 3.0.1
- Author:
- Keith Donald, Juergen Hoeller
- See Also:
- Serialized Form
Field Summary
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 Description EvalTag()
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
doEndTag()
int
doStartTagInternal()
Called by doStartTag to perform the actual work.void
setExpression(String expression)
Set the expression to evaluate.void
setJavaScriptEscape(boolean javaScriptEscape)
Set JavaScript escaping for this tag, as boolean value.void
setScope(String scope)
Set the scope to export the evaluation result to.void
setVar(String var)
Set the variable name to expose the evaluation result under.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, doFinally, doStartTag, getRequestContext
Methods inherited from class javax.servlet.jsp.tagext.TagSupport
doAfterBody, findAncestorWithClass, getId, getParent, getValue, getValues, release, removeValue, setId, setPageContext, setParent, setValue
Constructor Detail
EvalTag
public EvalTag()
Method Detail
setExpression
public void setExpression(String expression)
Set the expression to evaluate.
setVar
public void setVar(String var)
Set the variable name to expose the evaluation result under. Defaults to rendering the result to the current JspWriter.
setScope
public void setScope(String scope)
Set the scope to export the evaluation result to. This attribute has no meaning unless var is also defined.
setJavaScriptEscape
public void setJavaScriptEscape(boolean javaScriptEscape) throws JspException
Set JavaScript escaping for this tag, as boolean value. Default is "false".- Throws:
JspException
doStartTagInternal
public int doStartTagInternal() throws JspException
Description copied from class:RequestContextAwareTag
Called by doStartTag to perform the actual work.- Specified by:
doStartTagInternal
in classRequestContextAwareTag
- Returns:
- same as TagSupport.doStartTag
- Throws:
JspException
- See Also:
TagSupport.doStartTag()
doEndTag
public int doEndTag() throws JspException
- Specified by:
doEndTag
in interfaceTag
- Overrides:
doEndTag
in classTagSupport
- Throws:
JspException