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Posted to user@struts.apache.org by "van Nuffel, Marc" <ma...@eenterprises.com> on 2002/08/22 12:41:13 UTC
solution for the missing refresh of ActionForm using checkboxes
problem :
a unchecked CheckBox doesent get unchecked after formSubmit..
problem description:
if you uncheck a CheckBox that was checked, after submiting the form,
it remains checked, because the browser doesent post data from unchecked
CheckBoxes.
so the ActionForm-setterMethod doesent get invoked.
our solution:
customTag:
the only enhancement of the org.apache.struts.taglib.html.CheckboxTag is
that we overwrite the doEndTag method and printing out an hiddenfield
after calling the super.doEndTag method. the hiddenfiled consists of an
unique name,
the value is the propertyString of the CheckboxTag .
ActionForm:
we made an abstract class ActionFormEnhanced that extends ActionForm.
we overwrite the method reset() and use reflection to find the setterMethods
which we have to invoke,
to unset the checkboxes. the method names are found over a generated hidden
field
produced from our costumTag "CheckBoxTagEnhanced" which inherits from
org.apache.struts.taglib.html.CheckboxTag
all this is fully transparent to the user.
the ActionFormEnhanced.java:
package com.eenterprises.ejob.web.forms;
import java.lang.reflect.Method;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
/**
* This ActionForm enhances Struts ActionForm
* @author Pierce Shah , Marc van Nuffel , Romeo Kienzler, Reto Bachmann
*/
public abstract class ActionFormEnhanced extends ActionForm {
private Class actionFormClass = getClass();
public static final String PARAMETER_TO_RESET = "res_checkb_666";
protected ActionFormEnhanced reference;
public void reset(ActionMapping mapping, HttpServletRequest request)
{
String[] checkBoxAttributeName =
request.getParameterValues(PARAMETER_TO_RESET);
Class[] parameterTypes = new Class[1];
parameterTypes[0] = boolean.class;
if (checkBoxAttributeName != null) {
for (int i = 0; i < checkBoxAttributeName.length;
i++) {
StringBuffer buffer = new
StringBuffer("set");
buffer.append(checkBoxAttributeName[i]);
buffer.setCharAt(3,Character.toUpperCase(buffer.charAt(3)));
Method method;
try {
method =
actionFormClass.getMethod(buffer.toString(), parameterTypes);
} catch (NoSuchMethodException nsmx) {
throw new
RuntimeException(nsmx.toString());
} catch (SecurityException sx) {
throw new
RuntimeException(sx.toString());
}
Object[] arglist = new Object[1];
arglist[0] = Boolean.FALSE;
try {
method.invoke(reference, arglist);
} catch (Exception ex) {
throw new
RuntimeException(ex.toString());
}
}
}
}
public ActionFormEnhanced() {
this.reference = this;
System.out.println(reference.getClass());
}
}
the CheckBoxTagEnhanced.java :
package com.eenterprises.ejob.web.forms;
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import org.apache.struts.taglib.html.CheckboxTag;
public class CheckBoxTagEnhanced extends CheckboxTag {
public int doEndTag() throws JspException {
int returnValue = super.doEndTag();
JspWriter out = pageContext.getOut();
try {
out.println(
"<input type=\"hidden\"
name=\""+ActionFormEnhanced.PARAMETER_TO_RESET+"\" value=\""
+ super.getProperty()
+ "\">");
} catch (IOException e) {
throw new JspException(e.getMessage());
}
return returnValue;
}
}
the struts-htmlE.tld :
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library
1.1//EN" "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">
<taglib>
<tlibversion>1.0</tlibversion>
<jspversion>1.1</jspversion>
<shortname>htmlE</shortname>
<uri>http://jakarta.apache.org/struts/tags-html-1.0</uri>
<tag>
<name>checkbox</name>
<tagclass>com.eenterprises.ejob.web.forms.CheckBoxTagEnhanced</tagclass>
<attribute>
<name>accesskey</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>alt</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>altKey</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>disabled</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>indexed</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>name</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>onblur</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>onchange</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>onclick</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>ondblclick</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>onfocus</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>onkeydown</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>onkeypress</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>onkeyup</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>onmousedown</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>onmousemove</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>onmouseout</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>onmouseover</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>onmouseup</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>property</name>
<required>true</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>tabindex</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>title</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>titleKey</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>value</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
Mit freundlichen Grüssen
( means kindly regards :-) )
eEnterprises Technology
Romeo Kienzler
Reto Bachmann
Pierce Sha
Marc van Nuffel
eProduction AG
Software Engineering
Förrlibuckstrasse 110, 8005 Zürich - Switzerland
Telefon +41 1 448 2121/2137 | Fax +41 1 448 2122
marc.vannufel@eenterprises.com | www.eproduction.ch
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