How do I make the form display a custom error message after it has been submitted?

Here's an example use case: a login form should have a custom error saying that the username or password were invalid.

My form is using redirect confirmation and it's during the execution of the redirected .php file that I detect an error. I'm thinking I need to use a header("Location: [url]") call to render the form with a custom error message but I'm open to any technique that will send the user back to the form and display an error message.

Curtis

Hi Curtis,
Click on the element you want to work with.
Click on the properties tab.
Scroll down to the bottom and enter your Error Message in the box provided.

Eric,

Two things about your solution:

1) The error message always appears after the cursor leaves the field. It should only appear when the username or password are incorrect.
2) The username/password check is in the redirected confirmation page (after doing a database lookup, of course). How do I trigger the error message to display from that PHP script?

Thanks.

Curits

1. Make both elements not required.
2. If you have your server setup to parse php inside html you can do this.