detect first page load jquery session - asp.net

Question

Once the user logs in, i am displaying an alert to user based on a check on page load method. Now when the user navigates to other aspx pages and clicks on home again, I don’t want him to see the alert again. I want to achieve this with jquery and session variable. In a way I want to check first page load by jquery using a session variable.

Answer 1

I could do this with Session and RegisterStartupScript
User Login code
public void doLogin(string userName, string pwd)
{
// validate user
// check to see whether need to show alert
Session["ShowAlert"]=true;
Response.Redirect("Home.aspx");
}
in Home.aspx
Option 1
protected void Page_Load(object sender, EventArgs e)
{
if(Session["ShowAlert"]!=null)
{
String scriptName = "PopupScript";
if (!IsClientScriptBlockRegistered(csname1))
{
StringBuilder cstext = new StringBuilder();
cstext.Append("<script type=\"text/javascript\"> function showUserAlert() {");
cstext.Append("alert('message');} ");
cstext.Append("</script>");
RegisterStartupScript(cstext, cstext.ToString());
Session.Remove("ShowAlert");
}
}
}
Option 2:
Just define a javascript variable var in the page and use it in $(function(){...})
protected void Page_Load(object sender, EventArgs e)
{
if(Session["ShowAlert"]!=null)
{
String scriptName = "PopupScript";
if (!IsClientScriptBlockRegistered(csname1))
{
StringBuilder cstext = new StringBuilder();
cstext.Append("<script type=\"text/javascript\">");
cstext.Append("var showAlert=true;");
cstext.Append("</script>");
RegisterClientScriptBlock(cstext, cstext.ToString());
Session.Remove("ShowAlert");
}
}
}
JS
$(document).ready(function(){
if(showAlert)
{
alert('ShowMessage');
}
});

Answer 2

I made this exact feature a couple of weeks ago, but used a mySQL database instead of using sessions. If you are wanting to display the alert to the user only once EVER (or as close to forever as possible) or just once a week etc, then you should use cookies instead of sessions.
Otherwise, you can detect when the page has loaded simply with jQuery:
$().ready(function(){
if(!$.session.get("viewed_page")){
alert("some message");
$.session.set("viewed_page", true);
}
});

Answer 3

No need for session here.
You can use the session cookie itself.
$(function (){
if (document.cookie.indexOf("yourToken")>-1)
{}
else
{
// show the window , and set a cookie
}
});