asked on

why am I unable to see these hidden field values in PostBack ?

I need to call a codebehind method and pass some parameters.
below is my code, the hidden field values are null eventhough I am setting them using javascript. what am I doing wrong ?

I get an exception - object reference not set to null at - Request.Params.Get("hidID").ToString()

why is it ?

-- aspx page 
function confirmDelete(id)
       {
       
            if(confirm("Do you want to Delete this Invoice?"))
            {
              
               //document.forms[0].hidAction.Value = "DELETE";
               //document.forms[0].hidID.Value     = id;
               document.getElementById('<%= hidAction.ClientID %>').Value = "DELETE";
               document.getElementById('<%= hidID.ClientID %>').Value = id;
               document.getElementById('<%= btnDelete.ClientID %>').click();
               return true;
               //document.getElementById("hidID").value = id;
 
            }
   
            
         
      }
 
 
codebehind
--------------
 
  if (Page.IsPostBack)
        {
            long InvoiceID = Convert.ToInt64(Request.Params.Get("hidID").ToString());
            if (Request["hidAction"].ToString().ToUpper() == "DELETE")
            {
                this.DeleteInvoice(InvoiceID);
            }
 
        }

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Kalpana_Natarajan

In the aspx page, you are retrieving the value of the hidId.ClientID control, but you are not adding this to the query string of the same page.
You need to call the page from javascript as http://<PageAddress>?hidID=<Value retreived in the javascript method> when the form is submitted.

The null reference is thrown because the name value pair of hidID is missing in the Request String, not because hidden field value didn't work.

Please let me know if anything is unclear.

Regards,
Kalpana

tech_question

ASKER

I do not want the users to see the value - I am not passing them as querystring but as form hidden values. Does that make sense ?

SOLUTION