Event Mapping should be done in onAfterInitEvent() only.
I tried to implement event mapping in this_onBeforeDisplayEvent() as
suggested by you. Problem is that, the mapped function is called for every
visual object and object gets populated (when this_onBeforeDisplayEvent() is
happening). But the object's properties set here will be overridden by the
default properties set in studio. Might be, ND tries to populate the visual
objects after this_onBeforeDisplay().
The code works fine for onBeforeHtmlOutputEvent() also, provided
"CSpHtmlOutputEvent" is passed, not "CSpDisplayEvent"
Regards,
Krupesha
-----Original Message-----
From: Curt Springer [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, May 25, 1999 10:04 PM
To: [EMAIL PROTECTED]
Subject: Re: [ND] Event Mapping in onAfterInitEvent() not working
Hi,
I'm not sure if event mapping is ideal for anything, actually.
It was ND's response to people like me yelling that they broke our code
going from ND3->ND4. And it does work, but it's complicated to set up, not
intuitive, imho, and easily breakable (as in your case with using private
instead of public on the method).
Since I did stuff using this approach, I have been working together on a
project with Grace Frederick, the ND world expert on display field
superclasses, and also I have been doing things with listeners and
anonymous inner classes. I'm not at the point of saying that there is no
situation where I would use event mapping in the future, but I'm almost
there, maybe will make that determination when pressure is off and we have
a chance to assess some stuff we've rushed up lately.
Perhaps I'll say a little more on this topic in the next day or so. Don't
have time right now.
-- Curt Springer, Team ND
At 07:51 PM 5/25/99 +0530, Krupesha C wrote:
>Thanks Curt,
>The code is working fine for "onBeforeDisplayEvent", once I made the method
>public. But still it was not working for "onBeforeHtmlEvent". I made the
>code to work with the help of your second suggestion. Thanks !
>And also, what is the ideal situation in which event mapping function could
>be used?
>
>Regards,
>Krupesha
>
>
>
>-----Original Message-----
>From: Curt Springer [mailto:[EMAIL PROTECTED]]
>Sent: Tuesday, May 25, 1999 6:26 PM
>To: [EMAIL PROTECTED]
>Cc: [EMAIL PROTECTED]
>Subject: Re: [ND] Event Mapping in onAfterInitEvent() not working
>
>
>I've done a fair amount of this stuff. It's a little bit tricky.
>
>One thing that jumps out is that your method 'myMappingFunction' is
>private. It must be public. I don't have time to do a detailed review of
>your code versus mine to see what else there might be.
>
>I also wonder if you really need to use the event mapping function, seeing
>that you're applying it to all page children.
>
>Here's another possible way to do it:
>
>public int this_onBeforeDisplayEvent(WhateverEvent event)
>{
> for (int i = 0; i < numOfChildren; i++)
> CSpVisual v = (CSpVisual)_children.elementAt (i);
> populatePlease(v);
>getEventAdapter (), false);
> }
>
>
>}
>
>A couple of cautions:
>
>-- The hidden page session object is one of the page children. You
>probably want to exclude this from your routine field processing. You can
>test on 'instanceof CSpPageSessionHidden' (look up the exact class name)
>
>-- I hadn't realized that the parent-level class variable _children is
>protected. You could insulate yourself from changes to ND's future
>structure by calling getChildren and then cycling through the returned list
>(which can be converted to an Enumeration)
>
>-- Curt Springer, Team ND
>
>
>At 05:10 PM 5/25/99 +0530, Krupesha C wrote:
>>The ND documentation says that, you can map the events associated with
>>visual objects to user defined methods in onAfterInitEvent(). This will be
>>helpful when the same code is used by many visual objects for
>>initialization. Instead of calling the user defined function in
>>visulaObject_onBeforeDisplayEvent(), we can map this method to event's
>>onBefore...Event() using CSpVisual.mapEvent() method
>>
>>Even though usage looks perfect for me, am getting the following error (ND
>>4.1):
>>spider.event.adapters.CSpPageEventAdapter.addEventMapping: Can't find the
>>method 'myMappingFunction' in target Object
>>of type 'myProject.myPage'
>>
>>The code used is like this:
>>
>>public int this_onAfterInitEvent(CSpInitEvent event)
>>{
>> int numOfChildren = _children.size (); //list of visuals
>> for (int i = 0; i < numOfChildren; i++)
>>
>>
>> CSpVisual v = (CSpVisual)_children.elementAt (i);
>> v.mapEvent ("onBeforeDisplayEvent", this, "myMappingFunction",
>>getEventAdapter (), false);
>> }
>> return (PROCEED);
>>}
>>
>>
>>private int myMappingFunction(CSpDisplayEvent event)
>>{
>> populatePlease((CSpVisual) event.getSource()); //Call generic routine now
>>}
>>
>>(ND Documention Series reference: "Changes You Have to Make to Your Code"
>>under "Migrating NetDynamics Projects to 4.x." of "Technical Briefs".
>>.../NetDynamics/NetDynamics40/Docs/res/techbriefs/migrate.html#@Changes)
>>
>>
>>Thanks for your time,
>>Krupesha
>>
>>
>>
>>
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