DO NOT REPLY [Bug 12297] - Simplified DispatchAction

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=12297

Simplified DispatchAction





------- Additional Comments From [EMAIL PROTECTED]  2002-09-05 11:01 -------
Even more flexibility if you need iterated submit:buttons gives this 
DispatchAction handler:
-------------------------------------------------------------------------
public ActionForward execute(ActionMapping mapping,...) throws Exception {
  // Identify the method name to be dispatched to
  String name = "unspecified";

  java.util.Enumeration enum = request.getParameterNames();
  while (enum.hasMoreElements()) {
    String item = (String)enum.nextElement();
    int i=item.indexOf("method=");
    if(i<0) continue;
    name=item.substring(i+7);
    if(i>0) { // Was a nested:submit Button, identify the clicked object
      String prop=item.substring(0,i-1);
      Object obj=PropertyUtils.getProperty(form,prop);
      request.setAttribute("clickedOBJ",obj); // store for later use
    }
    break;
  }
  return dispatchMethod(mapping,form,request,response,name);
}

public Object getClickedObject(HttpServletRequest request) {
  return request.getAttribute("clickedOBJ");
}
----------------------------------------------------------------------------
In the JSP you can have something like this:
<nested:form action="/list.do">
  <table>
    <nested:iterate property="list">
      <tr>
        <td><nested:submit property="method=delete" value="Delete this"/></td>
        <td><nested:submit property="method=insert" value="Empty here"/></td>
        <td><nested:text property="this/" /></td>
      </tr>
    </nested:iterate>
  </table>
  <html:submit property="method=save">Save everything</html:submit>
  <html:submit property="method=append">append empty to list</html:submit>
</nested:form>
-----------------------------------------------------------------------------
And the Action-Class must implement these methods:

public ActionForward save(ActionMapping mapping,...) throws Exception {
  // ... do something when the Save-Button was clicked
}

public ActionForward delete(ActionMapping mapping,...) throws Exception {
  Object obj=getClickedObject(request);// Delete for this obj was clicked
}

public ActionForward append(ActionMapping mapping,...) throws Exception {
  //... do something, because the Append-Button was clicked
}

public ActionForward insert(ActionMapping mapping,...) throws Exception {
  Object obj=getClickedObject(request); // Insert was clicked for this object
}
----------------------------------------------------------------------------
I think this is pretty comfortable.

Oliver Henning

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