JavaScript functions not completed when Ajax callbacks are involved

[Nathan Sokalski]

I have a Validator that uses callbacks in the javascript client-side
evaluation. the client-side JavaScript function specified in the
WebForm_DoCallb ack function does not complete until the Validator function
(the one specified using the evaluationfunct ion attribute) has completed.
Because of this, I cannot use the results of the callback in the result of
the evaluationfunct ion. Any ideas? Thanks.
--
Nathan Sokalski
njsokalski@hotm ail.com

http://www.nathansokalski.com/

[Blackhand]

Re: JavaScript functions not completed when Ajax callbacks are involved

WebForm_DoCallb ack is defined as such:

WebForm_DoCallb ack('__Page',Co mmand,CallBackH andler,context, onError)

The parameter you want to pay attention to is "CallBackHandle r".

CallBackHandler is a function to be executed only when the ajax request
to the server has received a response and has been fully completed.

The context parameter is also important, as it defines the context the
CallBackHandler function is to be executed in.

Example

WebForm_DoCallb ack('__Page',Co mmand, function() {
//Code you want executed when the ajax request to the server has
completed successfully.
}, this); //Set the context of the callback handler to the current context

Its important to remember, the flow of javascript is a little different
to your traditional language. If a request is started, the flow of the
code WILL NOT STOP and wait for the request to complete, it will carry
on running, this is why callback handlers are often implemented as
additional function parameters.

Nathan Sokalski wrote:

I have a Validator that uses callbacks in the javascript client-side
evaluation. the client-side JavaScript function specified in the
WebForm_DoCallb ack function does not complete until the Validator function
(the one specified using the evaluationfunct ion attribute) has completed.
Because of this, I cannot use the results of the callback in the result of
the evaluationfunct ion. Any ideas? Thanks.

[=?Utf-8?B?YnJ1Y2UgYmFya2Vy?=]

RE: JavaScript functions not completed when Ajax callbacks are involve

you can not use an async call from a validator. as the validator return value
controls whether the postback is done. you could make sync webservice call,
or cancel the postback, then in javascript start the postback again in the
async callback.


-- bruce (sqlwork.com)


"Nathan Sokalski" wrote:

I have a Validator that uses callbacks in the javascript client-side
evaluation. the client-side JavaScript function specified in the
WebForm_DoCallb ack function does not complete until the Validator function
(the one specified using the evaluationfunct ion attribute) has completed.
Because of this, I cannot use the results of the callback in the result of
the evaluationfunct ion. Any ideas? Thanks.
--
Nathan Sokalski
njsokalski@hotm ail.com

http://www.nathansokalski.com/

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