// PageMethods.js

var displayElement;
var valueElement;

// Initializes global variables and session state.
function pageLoad()
{
    displayElement = $get("ResultId");
    valueElement = $get("ValueId");
    PageMethods.SetSessionValue("SessionValue", Date(), 
        OnSucceeded, OnFailed);
}

// Gets the session state value.
function GetSessionValue(key) 
{
    PageMethods.GetSessionValue(key, 
        OnSucceeded, OnFailed);
}

//Sets the session state value.
function SetSessionValue(key, value) 
{
    PageMethods.SetSessionValue(key, value, 
        OnSucceeded, OnFailed);
}

// Callback function invoked on successful 
// completion of the page method.
function OnSucceeded(result, userContext, methodName) 
{
    if (methodName == "GetSessionValue")
    {
        displayElement.innerHTML = "Current session state value: " + 
            result;
    }
    else
    {
		valueElement.innerHTML = "Session state value was sent: "+result;
    }
}

// Callback function invoked on failure 
// of the page method.
function OnFailed(error, userContext, methodName) 
{
    if(error !== null) 
    {
        displayElement.innerHTML = "An error occurred: " + 
            error.get_message();
    }
}

if (typeof(Sys) !== "undefined") Sys.Application.notifyScriptLoaded();