Question

If i have a form which action should differ according to some session variable . How can i change the action of the form dynamically so that on client click of specific link button i could submit the form with the required action.

---

<form id="myform" action="I wanna to change it dynamically" method="post" > 
    <%-------------%> 
</form>

---

<script type="text/javascript">
    function submitform()
    {
      document.myform.submit();
    }

</script>

---

For example :

If session["emp"] = 1 then the action is /A.aspx

If session["emp"] = 2 then the action is /B.aspx

Answer 1

Option 1

I typically place server values in hidden fields when the form loads so that I can interact with them in JavaScript:

function submitform()
{
    // Get URL that was set server-side for form submission
    var myHiddenObj = document.getElementById("<%= hdnServerValue.ClientID %>");

    // Get form object
    var myFormObj = document.getElementById("myform");

    // Change form action & submit
    myFormObj.action = myHiddenObj.value;
    myHiddenObj.submit();
}

Option 2

If you simply want the form action to change and require no other client-side processing, simply change the form action on the server (you’ll need to add runat="server" to your form tag):

Markup:

<form id="myform" runat="server" action="" method="post" > 
    <%-------------%> 
</form>

C# (or your preferred server side language)

if(Session["emp"].ToString() == "1")
    myform.Action = "A.aspx";
else if (Session["emp"].ToString() == "2")
    myform.Action = "B.aspx";
else
    // Handle neither 1 or 2