returning value from page method in asp.net

Question

I have a page method which is doing some complicated validation on server side. I have a button to validate. javascript code is below:

function resultOfValidation(result);
{
    return result;
}

function IsValidDate()
{
    PageMethods.ComplicatedValidation(resultOfValidation);
}

C# code:

[WebMethod]
public static bool ComplicatedValidation()
{
    return true;
} 

but I want to do like

function IsDateTimeAvailable()
{
    var result= PageMethods.ComplicatedValidation();
}

As per my knowledge, it is not possible. If you have any alternative, then please guide me.

Answer 1

Two last parameters for webmethod on client side are success and error callbacks. You can use them. reuturn value is passed to those functions like an argument.

Answer 2

More...

function GetValue() 
{ 
    return PageMethods.GetValueFromServer( 
     function(result) 
       { 
          // The result that is returned from server 
          //Now do what ever you would like to do. 
       }
    ); 
}

Answer 3

You can try something like this:

           var secuencias = new String;
           jQuery("#add_note").click(function() {

                                                    $.ajax({
                                                    type: "POST",
                                                    url: '<%= ResolveUrl("~/Paginas/EscuchadorAlertas.aspx/ConsultarAlertas") %>',
                                                    data: "{}",
                                                    contentType: "application/json; charset=utf-8",
                                                    dataType: "json",
                                                    async: false,
                                                    success: function(msg) {
                                                        secuencias = msg.d;
                                                    },
                                                    error: function() {
                                                        alert("error");
                                                   }
                                                   });
                                                });

As you can see inside the variable secuencia is stored the value of de function ConsultarAlertas which is a PageMethods function that just return a String.