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c:set target

 
mallika shah
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hello friends,
i tried this

<jsp:useBean id="beans" class="model.BookDB"/>

<c:set target="${beans}" property="name" value="mallika"/>

<c ut value="${beans.name}"/>

My question is:-
i tried using target=${model.BookDB} but it didnt work.
Then i tried target="${beans}" and it worked.
Should target=id ??
As in HF book it says,"dont put the "id" name of the attribute here .Page 446(with a body)
It needs a value that resolves toa real thing..

Then according to this what shoul dbe the target?
Is the thing i am doing is wrong??

thanks,
mallika
 
Sergio Tridente
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Originally posted by mallika shah:
As in HF book it says,"dont put the "id" name of the attribute here .Page 446(with a body)
It needs a value that resolves toa real thing..


Imagine your bean has been created and set as a request (or any other scope's) attribute named "myBean". What you cannot do is:
<c:set target="myBean" property="name" value="mallika"/>

Because "myBean" is not an object, just the attribute name that 'refers' to that object. But you could use EL to get the real object: target="${myBean}".

The JSP code you pasted is alright because:
1) <jsp:useBean id="beans" class="model.BookDB"/> creates a model.BookDB object (the bean) with name "beans" (aka the attribute name) in page scope IIRC.
2) <c:set target="${beans}" property="name" value="mallika"/> is fine because ${beans} evaluates to the object itself (print ${beans} in your page and you will get the model.BookDB.toString() result printed out: something like @09874A, the default toString() method if you did not override it in your bean's class).

I hope I did not complicate things even more :-)
[ April 03, 2007: Message edited by: Sergio Tridente ]
 
Anupama Ponnapalli
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Looking at the jsp source generated for the EL expression might help too
 
mallika shah
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Thanks Sergio,
It was really a nice explanation..

Thanks anupama,looked at the generated java file as well to understand.it helps..

mallika
 
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