A night's decent sleep and I realize what the solution is. Find the action forward but
dont save the name of the forward into the request scope. Save
the forward's path instead!
if ( !isTokenValid() ) {
// transaction error
saveErrors( ... )
ActionForward fwd = mappings.findForward("transaction-invalid");
request.setAttribute( "com.db.project.AFTER_TRANSACTION_INVALID", fwd.getPath() );
return mapping.findForward( "invalid-form-input" );
}
The forward path, of course, is a reference to the next action
<forward name="transaction-invalid"
path="/AdsurdCalc.do?action=promptForm" />
Now everything makes sense. I simply use a bog standard HTML Form tag
and a bit of java script to submit the form.
<html:errors/>
<logic:present name="com.db.project.AFTER_TRANSACTION_INVALID" >
<form action="<%= request.getAttribute("com.db.project.AFTER_TRANSACTION_INVALID")
%>" >
Please continue to the restart page
<input type="button" value="Continue" onclick="this.form.submit();" >
</form>
</logic:present>
So after a transaction token error I give the user the option to move FORWARD
as well back. Going backwards usually results in the same attempt to
insert the row in to the database again [double-insertion] which
is what transaction tokens are designed to protect. So the user ends
up getting very __frustrated__ after going round and around in circles.
Not good for any professional web application!
http://www.xenonsoft.demon.co.uk/axioms2.html
--
Peter Pilgrim ++44 (0)207-545-9923
//_\\
"Mathematics is essentially the study of islands of =======
disparate subjects in a sea of ignorance." || ! ||
Andrew Wiles _____________
---------------------------------------- Message History
----------------------------------------
From: Peter Pilgrim/DMGIT/DMG UK/DeuBa@DMG UK on 20/12/2001 16:37
Please respond to "Struts Users Mailing List" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc:
Subject: Transaction Token: How can a html:form submit a forward
When you transaction token invalid you normally forward
to nice smiling double transaction screen and print a nice error message.
You want to prevent or suggest that user not hit the [BACK] button in the
browser.
I would like to put a simple button "Continue" that forwards to the "promptForm"
page.
if ( !isTokenValid() ) {
// transaction error
saveErrors( ... )
ActionForward fwd = mappings.findForward("transaction-invalid");
request.setAttribute( "com.db.project.AFTER_TRANSACTION_INVALID", fwd );
return mapping.findForward( "invalid-form-input" );
}
Do you see what I am doing here? I am finding a forward "transaction-invalid"
to allow the user to go FORWARD rather than BACKWARDS.
In each ActionMapping I can declare a "transaction-invalid" that redirect to
the same action and forward to the "promptForm" screen.
<action path="/AbsurdCalc"
type="com.db.project.jsp.actions.AbsurdCalc"
name="calcForm"
scope="request"
validate="false" >
<forward name="promptForm" path="/calcForm.jsp"/>
<forward name="success" path="/calcResul.tjsp"/>
<forward name="transaction-invalid
path="/AdsurdCalc.do?action=promptForm" />
</action>
So I would like to write in "invalid-form-input.jsp" something like this
<html:errors/>
<logic:present name="com.db.project.AFTER_TRANSACTION_INVALID" >
<html:form forward="<%=
request.getAttribute("com.db.project.AFTER_TRANSACTION_INVALID") %>" >
Please continue to the restart page
<html:button value="Continue" />
</html:form>
</logic:present>
I know <html:form> does not support a forward tag attributes. Any Suggestion?
--
Peter Pilgrim ++44 (0)207-545-9923
//_\\
"Mathematics is essentially the study of islands of =======
disparate subjects in a sea of ignorance." || ! ||
Andrew Wiles __________________________/\________/\__||_!_||__
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