Javascript to search textboxes

If you want to search for specific characters like the @ symbol.

For example if the @domain is already in the postfix of the email block since it is mandatory.

You can use the below javascript in your bootstrap layout.

<script>

    function _initPreview() {

        if ($("[data-blockname='Email']").val().includes("@"))

        {

            alert ("Please don't enter @ into the Email textbox");

            return false;

        }

        return true;

    }

</script>