Run javascript on the first page load

Question

I only want to run a javascript method on the page load the 1st time only. If there is a postback I do not want to run that method again.

This method is setting the defaults to certain textboxes.

If I add an onLoad to the body element it runs it each time on the postback . I've tried a ClientScript.RegisterStartupScript but that too runs the method on the postback as well.

Am I going to have to do it old school where I have to increment a hidden value and check that each time?

Answer 1

Try defining the method within your Page_Load event using the IsPostBack property to determine if it is the initial load or not :

protected void Page_Load(object sender, EventArgs e)
{
     if(!IsPostBack)
     { 
         // It is the initial load, call your script
         ClientScript.RegisterStartupScript(...);
     }
}    

The Page_Load event will be called every time that your page is loaded, regardless of a PostBack or not. It will only ever be false on the initial load, so if you place your call within there, it should only execute the script a single time.