submiting form reloads the window even with e.preventDafault() code example

Example 1: javascript prevent form submit

<form name="foo" onsubmit="return false">

Example 2: jquery submit refresh page stop

$("#prospects_form").submit(function(e) {
    e.preventDefault();
});

Example 3: submit() refreshes the page

<form onsubmit="return false;">Form stuff in here</form>