How to call a javascript function from a control within a masterpage?

Question

I have a masterpage with a Login Control in it. When the Login button is clicked, I would like for a JQuery Dialog to popup if the user's membership is about to expire within 30 days, else it will just log them in as normal. I can't figure out how to do it. I wll post parts of code:

Here is the javascript:

<script type="text/javascript">
    function showjQueryDialog() {
        $("#dialog").dialog("open");
    }

    $(document).ready(function() {
        $("#dialog").dialog({
            autoOpen: false,
            modal: true,
            buttons: { "Renew Membership": function() 
                     { $(this).dialog("close"); } }
        });
    });
</script>

The login button is called ibtnLoginButton and here is part of the code:

//Grab the user profile.
UserProfiles userProfile = 
             UserProfiles.GetUserProfiles(txtUserName1.Text);

//Calculate the Time Span
TimeSpan timeSpan = userProfile.Expiration.Subtract(DateTime.Now);

if (timeSpan.Days < 30)
{
 //Show JQuery Dialog Here
}
else
{
  //Continue with Login Process.
}

Answer 1

Why not always call the jquery method when the button is clicked, and then determine within the javascript method whether or not you want to show the dialogue? If not, just don't do anything. Since you're just checking whether ExpirationDate is smaller than now + 30 days, you can do that calculation just fine in javascript.

Edit:

I can't provide you with the exact solution, but here is some pseudocode to get you on your way.

First make the user profile's expiration date need available in javascript:

<script>
var userProfileExpiresOn = "<asp:Literal ID="userProfileExpiresOn" />";
</script>

Then edit your method so that it does the logic you're currently doing server-side for you:

<script>
function showjQueryDialog() {
  if (userProfileExpiresOn < (now + 30 days))
    $("#dialog").dialog("open");
}
</script>

You can find some documentation on how to work with dates in Javascript at W3schools.

Answer 2

how about this?

if (timeSpan.Days < 30)
{
 //Show JQuery Dialog Here
ScriptManager.RegisterClientScriptBlock(this, typeof(Page), "showExpiration", "showjQueryDialog()", true);
}

Answer 3

If, as you've said you've got this jQuery dialog to appear when clicking an asp:Button, why not just hide the button and change your javascript to just press the button once the page has loaded?