Form submit sample (form id)

how to trigger form submit?

by camel2243

HTML

<form 
  id="login-form" 
  onsubmit="alert('onsubmit'); return false;">
  username: <input type="text" name="username">
  password：<input type="password" name="password">
</form>
<hr />

<input
  form="login-form"
  type="submit" 
  value="login" 
  onclick="alert('onclick login button');" 
/>