Question

A session is being passed after successful login from a aspx page to an html page, i want to be able to get the session object using JSON and modify html elements, can anyone post a simple example on how to do that using JSON ?

thanks.

Answer 1

You will need to make a AJAX call from the clientside to a web service method or a page method (webmethod defined in your page).

If you choose for the page method option your code could be something like this:

Your code behind of your Page.aspx

    public class CustomSessionObject
    {
        public string Name { get; set; }
    }

    [WebMethod]
    public static object GetSessionData()
    {
        try
        {
            return HttpContext.Current.Session["THE_SESSION_VAR_YOU_NEED"] as CustomSessionObject;
        }
        catch (Exception e)
        {
           //Log Exception

            throw;
        }
    }

I would not advise to always give back all the session vars. Make it explicit and give only back the ones you need. This way if on a later moment in time a other developer adds more user session vars they will not be returned as well. If you do this, it might be a security leak in the future.

Using JQuery for making the AJAX call.

var handleError = function(jqXHR, textStatus, errorThrown) {
    alert("An error occurred: " + jqXHR.responseText);
};

var handleSuccess = function(data, textStatus, jqXHR) {
    if (data && data.d) {
        alert(data.d.Name);
    }
};

$.ajax({
    url: 'Page.aspx/GetSessionData',
    type: "POST",
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: handleSuccess,
    error: handleErr
});

Also read this for some more info.