LinkButton Click Event

Question

Hi everybody,

I have this problem .. I have one "Login" linkbutton and one "UserList" linkbutton on one masterpage. When the user is logged in, and he clicks "UserList" linkbutton, the UserList Page which has the masterpage mentioned above, opens.(This i have achieved).

but if the user is not logged in and he clicks "UserList", the "Login" linkbutton's click should be called. how can i achieve this? Please Help..

Answer 1

Try this:

In the HTML of the MasterPage:

Define an event handler for LinkButtonLogin's onclick event:

<asp:linkbutton id="LinkButtonLogin" runat="server" 
    text="Login" onclick="LinkButtonLogin_Click"></asp:linkbutton>

Create a dummy button that is hidden from view. Then, for the ModalPopupExtender, change the TargetControlID of the ModalPopupExtender control from LinkButtonLogin to ButtonInvisible. This effectively fakes the ModalPopupExtender into being hideable/showable from your code.

<asp:button id="ButtonInvisible" runat="server" style="display: none;" />

In the codebehind of the MasterPage:

protected void Page_Load(object sender, EventArgs e)
{
    /*             
        This adds a client-side event to your HyperLink control that mimics
        LinkButtonLogin's onclick event, but ONLY if the current user is not 
        logged in.
    */
    if (!UserIsLoggedIn())
    {
        HyperLinkUserList.Attributes.Add("onclick", 
            "document.getElementById('" + 
                LinkButtonLogin.ClientID + "').click();");
    }
}

protected void LinkButtonLogin_Click(object sender, EventArgs e)
{
    // check if the user is logged in.       
    if (!UserIsLoggedIn())
    {         
        // show the modal login window
        ModalPopupExtender.Show();
    }
    else
    {
        /* 
           This assumes that you always want a user to 
           go to the UserList page upon being logged in.
           You can add some code here to redirect to 
           different pages based on certain criteria.
        */
        Response.Redirect("userlist.aspx");
    }
}

Answer 2

One way to do it is to add an authorization section in your web.config file that will trip the login page when the user clicks the UserList link and the user is not logged in:

<location path="UserList.aspx">
 <system.web>
  <authorization>
   <deny users="?"/>
  </authorization>
 </system.web>
</location>

If if makes sense for your app, you can even hide the Userlist link from non-logged in users by using the <asp:LoginView> control.