Hi,
because we have a lot of questions concerning asynchronous and
synchronous calls (on client-side JavaScript code) I will list some
keywords here:
1) Asynchronous calls:
<script type="text/javascript">
function callback(res) {
alert(res.value);
}
function invokeMyMethod() {
Namespace.Classname.MyMethod(callback);
}
</script>
a) is the preferred way to call AjaxMethods from the client-side code
b) will not freeze web browser application (you are able to click
around, move the window, or call another AjaxMethod
c) can use client-side timeouts to control what to do if requests
needs longer than usual
d) a maximum of 2 concurrent requests are possible, and additional
requests will be queued and started after one of the 2 concurrent
requests is finished
2) Synchronous calls:
<scritp type="text/javascript">
function invokeMyMethod() {
var res = Namespace.Classname.MyMethod();
alert(res.value);
}
</script>
a) will freeze web browser application (on Internet Explorer the
complete content can be invisible because during the request is
running the display cannot be updated, you are not able to do other
things on the same web page)
b) you have to wait until the request is finished, there is no way to
abort the request
c) only one synchronous request at the same time possible
So, please use everytime the asynchronous call because it makes no
sense to use the synchronous because of all the disadvantages.
--
Best regards | Schöne Grüße
Michael
Microsoft MVP - Most Valuable Professional
Microsoft MCAD - Certified Application Developer
http://weblogs.asp.net/mschwarz/
http://www.schwarz-interactive.de/
mailto:[EMAIL PROTECTED]
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