>I've implemented a simple taglib class to support URL rewriting for
>the <frame> tag.
>
>It's a simple subclass of LinkTag overriding doStartTag to include
>added attributes and put the URI in "src" instead of "href". It
>supports all of the attributes in HTML 4.0
><http://www.w3.org/TR/REC-html40/present/frames.html#h-16.2.2>
>
>One question I would consider open is how to best handle "longdesc"
>-- this is an HTML 4.0 attribute (which I'd never heard of before)
>which is supposed to take a URI. I simply put it in as an attribute
>which would be copied over, but probably it should support all of
>the same URL rewriting that other URIs can get. Coming up with a
>graceful solution to that is more than I have time for right now.
Here is the code, followed by the <tag> fragment for struts-html.tld
--------begin (org.apache.struts.taglib.html) FrameTag.java -------------
package org.apache.struts.taglib.html;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Iterator;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionForwards;
import org.apache.struts.util.MessageResources;
import org.apache.struts.util.RequestUtils;
import org.apache.struts.util.ResponseUtils;
/**
* Provide URL Rewriting for Frame tags. The frame <code>src</code> attribute
* value is constructed using the same attributes as those used in
* <code>LinkTag</code> to render <code>href</code>. Additionally,
the HTML 4.0
* frame tag attributes <code>noresize</code>, <code>scrolling</code>,
* <code>marginheight</code>, <code>marginwidth</code>,
* <code>frameborder</code>, and <code>longdesc</code> are supported.
The frame
* <code>name</code> attribute is rendered based on the <code>frameName</code>
* property.
*
* Note that the value of <code>longdesc</code> is intended to be a URI, but
* currently no rewriting is supported. The attribute is set directly from
* the property value.
*
* @author Joe Germuska
*/
public class FrameTag extends LinkTag
{
/**
* Render the appropriately encoded URI.
*
* @exception JspException if a JSP exception has occurred
*/
public int doStartTag() throws JspException {
// Generate the hyperlink URL
Map params = RequestUtils.computeParameters
(pageContext, paramId, paramName, paramProperty, paramScope,
name, property, scope, transaction);
String url = null;
try {
url = RequestUtils.computeURL(pageContext, forward, href,
page, params, anchor, false);
} catch (MalformedURLException e) {
RequestUtils.saveException(pageContext, e);
throw new JspException
(messages.getMessage("rewrite.url", e.toString()));
}
// Print this element to our output writer
StringBuffer results = new StringBuffer("<frame ");
results.append("src=\"");
results.append(url);
results.append("\"");
if (frameName != null)
{
results.append(" name=\"");
results.append(frameName);
results.append("\"");
}
if (noresize != null)
{
results.append(" noresize");
}
if (scrolling != null)
{
results.append(" scrolling=\"");
results.append(scrolling);
results.append("\"");
}
if (marginheight != null)
{
results.append(" marginheight=\"");
results.append(marginheight);
results.append("\"");
}
if (marginwidth != null)
{
results.append(" marginwidth=\"");
results.append(marginwidth);
results.append("\"");
}
if (frameborder != null)
{
results.append(" frameborder=\"");
results.append(frameborder);
results.append("\"");
}
if (longdesc != null)
{
results.append(" longdesc=\"");
results.append(frameborder);
results.append("\"");
}
results.append(prepareStyles());
results.append(">");
ResponseUtils.write(pageContext,results.toString());
// Skip the body of this tag
return (SKIP_BODY);
}
/**
* Ignore the end of this tag.
*
* @exception JspException if a JSP exception has occurred
*/
public int doEndTag() throws JspException {
return (EVAL_PAGE);
}
public String getNoresize()
{
return noresize;
}
public void setNoresize(String noresize)
{
this.noresize = noresize;
}
public void setScrolling(String scrolling)
{
this.scrolling = scrolling;
}
public String getScrolling()
{
return scrolling;
}
public void setMarginheight(String marginheight)
{
this.marginheight = marginheight;
}
public String getMarginheight()
{
return marginheight;
}
public void setMarginwidth(String marginwidth)
{
this.marginwidth = marginwidth;
}
public String getMarginwidth()
{
return marginwidth;
}
public void setFrameName(String frameName)
{
this.frameName = frameName;
}
public String getFrameName()
{
return frameName;
}
public void setFrameborder(String frameborder)
{
this.frameborder = frameborder;
}
public String getFrameborder()
{
return frameborder;
}
public void setLongdesc(String longdesc)
{
this.longdesc = longdesc;
}
public String getLongdesc()
{
return longdesc;
}
private String noresize;
private String scrolling;
private String marginheight;
private String marginwidth;
private String frameName;
private String frameborder;
private String longdesc;
}
------- end (org.apache.struts.taglib.html) FrameTag.java -------
------- begin fragment for struts-html.tld -------
<tag>
<name>frame</name>
<tagclass>org.apache.struts.taglib.html.FrameTag</tagclass>
<attribute>
<name>anchor</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>forward</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>href</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>frameName</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>longdesc</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>name</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>page</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>paramId</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>paramName</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>paramProperty</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>paramScope</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>property</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>scope</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>transaction</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>style</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>styleClass</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>styleId</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>title</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
------- begin fragment for struts-html.tld -------
--
--
* Joe Germuska { [EMAIL PROTECTED] }
"It's pitiful, sometimes, if they've got it bad. Their eyes get
glazed, they go white, their hands tremble.... As I watch them I
often feel that a dope peddler is a gentleman compared with the man
who sells records."
--Sam Goody, 1956
tune in posse radio: <http://www.live365.com/stations/289268>
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