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How does ASP.NET AJAX work when getting values ​​from the server?

If I want to call a server function from javascript to get the person's name from the database (as an example) ... and I went ...

name = myServices.getName (userId);

If I have a manager script with a service reference to an .asmx file that has a getName (int userId) {} ​​method, then this function should be called correctly and will eventually return the name for that userId.

Sorry, I want to do ....

name = myServices.getName (userId); warning (name);

however when you do ASP.NET AJAX it will invoke the web method and continue execution before waiting for a response from the server (which I understand is the point of ajax to stop the browser from hovering waiting for data)

I need to get the name back from the server before I can continue executing ... How can I go about this to fix this issue?

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4 answers


There is a method that you can add as a parameter to the service method that will call the success method where you can do other things.

For instance:



function test(){

        PageMethods.MyMethod("name", OnMyMethodComplete);

    }



    function OnMyMethodComplete(result, userContext, methodName)

    {

      alert(result);

    }
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If you want to call a web method synchronously, you will need to set up the request manually and use Sys.Net.XMLHttpSyncExecutor.



Here's an example (see ExecuteSynchronously function)

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For a javascript solution, you can loop until the name gets a value. Adjust latency based time to keep the app live

var time = 100;
window.setTimeout(name = '' ? wait : continue, time);




function wait()
{
    window.setTimeout(name = '' ? wait : continue, time);
}
function continue()
{
    //code having to do with name
    alert(name)
}
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congratulations. you've taken your first step into a larger asynchronous world. I would definitely like to use the callbacks suggested by CSharpAtl.

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