I've tried $('#field').focus(), and any other method found on the internet. Nothing worked. I have a simple html that reproduces the problem.
<!DOCTYPE html> 
<html> 
    <head> 
        <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
        <script type="text/javascript">
            $(document).ready(function() {
                $('#field').focus();
            });
    </script>
</head> 
<body>
    <input type="text" id="field" name="field"/>
</body>
</html>
Please help!