Because the designers of HTML haven't figure out yet that an <a> tag
should have a method attribute, like a <form>.
Also, the URLs should not be particularly long, as you should be
putting in just the ids of objects. If objects are showing up a long
MIME encoded serialized strings, you may want to rethink your
strategy.
On Sun, Mar 23, 2008 at 11:24 AM, Yura Tkachenko
<[EMAIL PROTECTED]> wrote:
> Thank you Anton. Both solutions are works good for me. But still I have a
> question why Tapestry 5 is generating long URL for activation context
> instead of sending these data using HTTP POST?
>
>
>
>
> On Sun, Mar 23, 2008 at 12:54 AM, Anton Litvinenko <
> [EMAIL PROTECTED]> wrote:
>
> > To pass more than parameter, a) from onPassivate method you should
> > return an object array:
> >
> > Object[] onPassivate() {
> > return new Object[] {getProductId(), "some string", true};
> > }
> >
> > b) Then you either define onActivate method as
> >
> > void onActivate(long productId, String xxx, Boolean yyy) {
> > setProductId(productId);
> > loadProduct();
> > }
> >
> > or
> >
> > void onActivate(Object[] context) {
> > Long projectId = Long.parseLong(((String) context[0]));
> > ....
> > }
> >
> > In case you decide to use the latter, then you should be aware that
> > context contains String representations of objects returned by
> > onPassivate.
> >
> > The second question: to pass your own value objects as context
> > parameters you should specify the strategy for converting your object
> > to string and restoring its state from the string (i.e. coercer) in
> > you AppModule. For instance to specify Date-to-String and
> > String-to-Date coercing you'd have to do the following:
> >
> > public static void
> > contributeTypeCoercer(Configuration<CoercionTuple> configuration) {
> > Coercion<Date, String> dateToString = new Coercion<Date, String>()
> > {
> > public String coerce(Date date) {
> > return (new
> > SimpleDateFormat(DATETIME_PATTERN)).format(date);
> > }
> > };
> >
> > Coercion<String, Date> stringToDate = new Coercion<String, Date>()
> > {
> > public Date coerce(String date) {
> > try {
> > return (new
> > SimpleDateFormat(DATETIME_PATTERN)).parse(date);
> > } catch (ParseException e) {
> > throw new RuntimeException("Coercion failed!", e);
> > }
> > }
> > };
> >
> > configuration.add(new CoercionTuple<Date, String>(Date.class,
> > String.class, dateToString));
> > configuration.add(new CoercionTuple<String,
> > Date>(String.class, Date.class, stringToDate));
> > }
> >
> > Check this for more:
> > http://tapestry.apache.org/tapestry5/tapestry-ioc/coerce.html
> >
> > Good luck!
> > Anton
> >
> > On Sun, Mar 23, 2008 at 8:32 AM, Yura Tkachenko
> > <[EMAIL PROTECTED]> wrote:
> > > And how I can pass more than one parameter? Or did you mean "I cannot
> > pass
> > > more than one parameter"?
> > >
> > > Thanks,
> > > Yura.
> > >
> > >
> > >
> > > On Sat, Mar 22, 2008 at 10:46 PM, SergeEby <[EMAIL PROTECTED]> wrote:
> > >
> > > >
> > > > Hi,
> > > >
> > > > You can pass more than one parameter.
> > > >
> > > > /Serge
> > > >
> > > >
> > > > Yura Tkachenko wrote:
> > > > >
> > > > > Hi All,
> > > > >
> > > > > I've been reading chapter about "Page Activation Context" here:
> > > > >
> > http://tapestry.apache.org/tapestry5/tapestry-core/guide/pagenav.html.
> > > > And
> > > > > I
> > > > > have a question: can I pass using activation context more than one
> > > > > parameter?
> > > > >
> > > > > For example in help we have an example:
> > > > >
> > > > > void onActivate(long productId) {
> > > > > setProductId(productId);
> > > > > loadProduct();
> > > > > }
> > > > >
> > > > > long onPassivate() {
> > > > > return getProductId();
> > > > > }
> > > > >
> > > > > Also it was mentioned onPassivate method should be like a mirror of
> > > > > onActivate. Does it means I can't pass more than one parameter?
> > > > > Another approach I tried is it create another Java Bean (wrapper
> > object)
> > > > > and
> > > > > simple try to pass this bean via activation context. In that case
> > my
> > > > > onActivate and onPassivate were:
> > > > >
> > > > > void onActivate(PageWrapper wrappedData) {
> > > > > System.out.println("Activated with message: " +
> > wrappedData);
> > > > > setWrapper(wrappedData);
> > > > > }
> > > > >
> > > > > PageWrapper onPassivate() {
> > > > > System.out.println("Page is passivated.");
> > > > > return getWrapper();
> > > > > }
> > > > >
> > > > > As the result I got exception. From URL I understood that Typestry
> > > > during
> > > > > passing parameter via activation context is converting it to get
> > > > request.
> > > > > In
> > > > > my case for wrapped object URL was:
> > > > >
> > > >
> >
> http://localhost:8080/t5first/second/com.packtpub.t5first.utils.PageWrapper%40307efc
> > > > > After looking to that URL I realized that T5 just call toString of
> > > > passed
> > > > > object :-)
> > > > > So my additional questions:
> > > > > 1) Why not allow to user pass his own objects (POJO)?
> > > > > 2) Why not pass data via HTTP POST? Because as far as I know HTTP
> > (at
> > > > > least
> > > > > some browsers and http servers) has some limitations to the length
> > of
> > > > > URLs.
> > > > > Besides sooner or later some smart users will pass string with a
> > few
> > > > > Kbytes
> > > > > and the page will get wrong data (truncated).
> > > > >
> > > > >
> > > >
> > > > --
> > > > View this message in context:
> > > >
> >
> http://www.nabble.com/Page-activation-context-question-tp16231642p16231791.html
> > > > Sent from the Tapestry - User mailing list archive at Nabble.com.
> > > >
> > > >
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> > > >
> > > >
> > >
> >
> >
> >
> > --
> > http://www.sourcekibitzer.org
> >
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> >
> >
>
--
Howard M. Lewis Ship
Creator Apache Tapestry and Apache HiveMind
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