AJAX Client Side Programming
page 7 of 8
by Brian Mains
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Exceptions

The client framework supports throwing exceptions through the use of exception classes.  The Error class has a series of methods that can be thrown.  For instance, if a parameter of a method is null, the following exception can be thrown:

Listing 18

throw new Error.argumentNull("value", "The value was null");

It's also possible to create custom exceptions; after all, an exception is a class object.  Many exception objects already exist in the framework, and so you have some options.  In case that doesn't suite you, it's possible to create your own and expose them from the Error class.  How to do that is out of scope for the article.


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User Comments

Title: Good Article   
Name: Amol
Date: 2010-09-17 2:48:44 AM
Comment:
Very good article
Title: Informative   
Name: PickaTutorial.com
Date: 2010-08-07 2:44:15 AM
Comment:
A good informative resource.
Title: good   
Name: good
Date: 2010-07-23 2:53:53 AM
Comment:
good
Title: Good   
Name: Ananth
Date: 2009-04-15 12:51:48 PM
Comment:
Good
Title: Parameters to be passed webserivices (reply)   
Name: Brian Mains
Date: 2009-02-09 8:59:45 AM
Comment:
Hello,

You could pass the values as straight parameters; I preferrably like to have the web service use a custom object that has those parameters. The reason is that it makes maintenance easier. If you need 21 parameters later, you have to change the web service, and anything that connects to this web service.

This way, you simply add a parameter to the class and make use of it in the web service, less coding work to do this way.

The proxy generator will also generate the class that's accepted by the parameter, as long as it's simple enough (not deeply nested properties), and you can instantiate this and pass it to the web service call.
Title: Parameters to be passed webserivices.   
Name: Rupesh Kumar Tiwari
Date: 2009-02-09 5:37:28 AM
Comment:
Hi,
I have to pass 20 parameters to a webmethod from the clientside.so, is it advisable to make a webmethod that will take 20 parameters or else i have to send one array of parameters to reduce the confusion. Any other suggesion do you have. then kindly tell me. Any quick response is appreciable.

Thanks,
Title: Thanks a lot for the info   
Name: The Black Knight
Date: 2008-11-19 6:24:52 PM
Comment:
Excellent info
Title: Nice Article   
Name: ---
Date: 2008-06-21 5:40:01 AM
Comment:
really nice article, it is good for the beginners.
good job :)
Title: dragpanel extender in ajax controls   
Name: lalitha
Date: 2008-06-12 5:46:21 PM
Comment:
its not working as i had written as it was mentioned here in the tutorial plse give a brief coding about that control
Title: expect more   
Name: sivaram
Date: 2008-05-02 4:50:01 AM
Comment:
ok .i expected more.If possible plz explain with the examples
Title: nice but shud little brief   
Name: snehal
Date: 2008-04-30 3:20:58 PM
Comment:
nice article but give more details on ajax its merits... funnalities future implementation ....etc thnx
Title: thanks   
Name: suhas kudekar
Date: 2008-04-23 9:02:58 AM
Comment:
its very new concept 4 me. thanks
Title: very good   
Name: panakj lahjoti
Date: 2008-04-21 7:34:42 AM
Comment:
hai
i found this aticle very useful for the newbies
Title: Very helpful   
Name: Raviraj
Date: 2008-04-20 1:28:30 PM
Comment:
thanks it is very helpful to me






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