Submit form when loading page

I have a form and I wanted the form to be loaded when the page was loaded. I'm using the code below, however it gets in an infinite loop.

<form name="teste" action="inicial" method="post">
Nome do Usuário: <input type="text" name="user">
<input type="submit" value="Enviar">
</form>

JS

$(document).ready(function () {
    window.onload = function() {    
    document.forms[0].submit();
    }
});

When I load the page, it submits infinitely. I thought I would run only once.