javawebparts.taglib.jstags
Class StringContentValidTag

java.lang.Object
  |
  +--javax.servlet.jsp.tagext.TagSupport
        |
        +--javawebparts.taglib.jstags.StringContentValidTag

All Implemented Interfaces:

javax.servlet.jsp.tagext.IterationTag, java.io.Serializable, javax.servlet.jsp.tagext.Tag

public class StringContentValidTag

extends javax.servlet.jsp.tagext.TagSupport

This class is a custom tag that renders the JWPStringContentValid() Javascript function which can be called to determine if a string contains only valid characters, or if a string does no contain any of a list of valid characters.

This tag uses the following attributes:

renderScriptTags - true/false - When set to true, the Javascript will be rendered inside a <script> </script> tag pair. When set to false, this will not be done and it is expected that the <jstags:fullTrim/> tag appears inside a <script> </script> tag pair. If this attribute is not present, the script tags WILL be rendered.

It renders the following Javascript:

JWPSCV_FROMLIST = 1; JWPSCV_NOTFROMLIST = 2; function JWPStringContentValid(jwpscv_inString, jwpscv_charList, jwpscv_FromExcept) { if (jwpscv_inString == null) { alert("Input string was null"); return false; } if (jwpscv_charList == null) { alert("Character list was null"); return false; } if (jwpscv_FromExcept == null) { alert("FROMLIST/NOTFROMLIST was null"); return false; } if (jwpscv_FromExcept == JWPSCV_FROMLIST) { for (i = 0; i < jwpscv_inString.length; i++) { if (jwpscv_charList.indexOf(jwpscv_inString.charAt(i)) == -1) { return false; } }
return true;
}
if (jwpscv_FromExcept == JWPSCV_NOTFROMLIST) {
for (i = 0; i < jwpscv_inString.length; i++) {
if (jwpscv_charList.indexOf(jwpscv_inString.charAt(i)) != -1) {
return false;
}
}
return true;
}
}

Usage example:

alert(JWPStringContentValid("This is a test", " thisae", JWPSCV_FROMLIST));
This will result in an alert box displaying "true" in it because all the characters in the string "This is a test" are in the character list " thisae", and the JWPSCV_FROMLIST flag was sent in. If you replace one of the characters with 'z' in the string being tested for instance, false would be shown because 'z' is not in the list of allowed characters.

alert(JWPStringContentValid("This is a test", "xyz", JWPSCV_NOTFROMLIST));
This will result in an alert box displaying "true" in it because none the characters in the string "This is a test" are in the character list " thisae", and the JWPSCV_NOTFROMLIST flag was sent in. If you replace one of the characters with 'z' in the string being tested for instance, false would be shown because 'z' is in the list of characters not allowed.

Author:

Frank W. Zammetti.

See Also:

Serialized Form

Field Summary

private static org.apache.commons.logging.Log	log Log instance.
private java.lang.String	renderScriptTags Whether to render the opening and closing script tags around the emitted Javascript.

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

StringContentValidTag()

Method Summary

int	doStartTag() Render the results of the tag.
void	setRenderScriptTags(java.lang.String inRenderScriptTags) renderScriptTags mutator.

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

doAfterBody, doEndTag, 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

log

private static org.apache.commons.logging.Log log

Log instance.

renderScriptTags

private java.lang.String renderScriptTags

Whether to render the opening and closing script tags around the emitted Javascript.

Constructor Detail

StringContentValidTag

public StringContentValidTag()

Method Detail

setRenderScriptTags

public void setRenderScriptTags(java.lang.String inRenderScriptTags)

renderScriptTags mutator.

Parameters:

inRenderScriptTags - renderScriptTags.

doStartTag

public int doStartTag()
               throws javax.servlet.jsp.JspException

Render the results of the tag.

Specified by:

doStartTag in interface javax.servlet.jsp.tagext.Tag

Overrides:

doStartTag in class javax.servlet.jsp.tagext.TagSupport

Returns:

Return code.

Throws:

javax.servlet.jsp.JspException - If anything goes wrong