Setting a property for a page at runtime

[Mindaugas Genutis <mi...@elinara.ktu.lt>]

Hello,

In my page which I inherited from BasePage I have an 'action' property 
(String mAction member with set/get methods).

I implemented the IExternalPage interface and in the activateExternalPage 
I set this 'action' property:

public void activateExternalPage(Object[] parameters, IRequestCycle cycle)
{
  Object[] params = cycle.getServiceParameters();
  setAction((String) params[0]);
}

Thus, the 'action' property is set. However, when I submit my page, in the 
formSubmit() method my action property is null:

public void formSubmit(IRequestCycle requestCycle)
{
  if(mAction.equals("Add")) // NullPointerException thrown here.
  {
  }
}

Thus, perhaps I don't understand the page properties lifecycle idea. How 
to make my page property stay persistent till the formSubmit method?

Thanks,

-- 
Kaunas Regional Distance Education Center
Programmer
Phone: +370 674 05232
WWW: http://distance.ktu.lt

Re: Setting a property for a page at runtime

[Mark Rose <mr...@docent.com>]

Paul Ferraro wrote:

> It sounds like you want mAction to be a persistent page property?
> Check out:
> http://jakarta.apache.org/tapestry/doc/TapestryUsersGuide/state.page-properties.html
> 
> Paul
> 
> On Wed, 2003-08-27 at 08:05, Mindaugas Genutis wrote:
> 
>>Hello,
>>
>>In my page which I inherited from BasePage I have an 'action' property 
>>(String mAction member with set/get methods).
[...]
>>Thus, perhaps I don't understand the page properties lifecycle idea. How 
>>to make my page property stay persistent till the formSubmit method?

Or, if you don't want to make the property persistent, then you can save 
the property state in a Hidden component. Put a <hidden> HTML element in 
the form, then bind the value to your property:

<component jwcid="theHiddenValue" type="Hidden">
   <binding name="value" expression="action"/>
</component>

Mark
-- 
Mark Rose
650.962.5665
mailto:mrose@docent.com

Re: Setting a property for a page at runtime

[Paul Ferraro <pa...@softhome.net>]

It sounds like you want mAction to be a persistent page property?
Check out:
http://jakarta.apache.org/tapestry/doc/TapestryUsersGuide/state.page-properties.html

Paul

On Wed, 2003-08-27 at 08:05, Mindaugas Genutis wrote:
> Hello,
> 
> In my page which I inherited from BasePage I have an 'action' property 
> (String mAction member with set/get methods).
> 
> I implemented the IExternalPage interface and in the activateExternalPage 
> I set this 'action' property:
> 
> public void activateExternalPage(Object[] parameters, IRequestCycle cycle)
> {
>   Object[] params = cycle.getServiceParameters();
>   setAction((String) params[0]);
> }
> 
> Thus, the 'action' property is set. However, when I submit my page, in the 
> formSubmit() method my action property is null:
> 
> public void formSubmit(IRequestCycle requestCycle)
> {
>   if(mAction.equals("Add")) // NullPointerException thrown here.
>   {
>   }
> }
> 
> Thus, perhaps I don't understand the page properties lifecycle idea. How 
> to make my page property stay persistent till the formSubmit method?
> 
> Thanks,

Re: Setting a property for a page at runtime

[Jesús Ramos <jr...@legosoft.com.mx>]

If I understand your question correctly, that is not the way you set
parameters for a page.
First, you have to declare a property in your page spec, like so:
<property-specification name='myProperty' type='com.foo.bar.MyBar'
persistent='yes' [initial-value="new com.foo.bar.MyBar()"]/>

Then, in your page, to retrieve and set page properties you use the methods:

(MyBar) getProperty("myProperty");

or setProperty("myProperty", new MyBar());

On the other hand, if you wish to set/retrieve parameters from the very
cycle, the way to do such thing is:

cycle.getRequestContext().getRequest().getParameter("param"));

This retrieves a parameter directly from the HTTP req.

Hope this was useful.

Best regards.

J. Ramos


----- Original Message ----- 
From: "Mindaugas Genutis" <mi...@elinara.ktu.lt>
To: <ta...@jakarta.apache.org>
Sent: Wednesday, August 27, 2003 10:05
Subject: Setting a property for a page at runtime


> Hello,
>
> In my page which I inherited from BasePage I have an 'action' property
> (String mAction member with set/get methods).
>
> I implemented the IExternalPage interface and in the activateExternalPage
> I set this 'action' property:
>
> public void activateExternalPage(Object[] parameters, IRequestCycle cycle)
> {
>   Object[] params = cycle.getServiceParameters();
>   setAction((String) params[0]);
> }
>
> Thus, the 'action' property is set. However, when I submit my page, in the
> formSubmit() method my action property is null:
>
> public void formSubmit(IRequestCycle requestCycle)
> {
>   if(mAction.equals("Add")) // NullPointerException thrown here.
>   {
>   }
> }
>
> Thus, perhaps I don't understand the page properties lifecycle idea. How
> to make my page property stay persistent till the formSubmit method?
>
> Thanks,
>
> -- 
> Kaunas Regional Distance Education Center
> Programmer
> Phone: +370 674 05232
> WWW: http://distance.ktu.lt
>
>
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