Syntax
document.form.checkbox.value
The value property provides access to value attribute of the check box.
This property is a read/write value that is sent to the server when the form is submitted.
<html>
<form name="orderForm">
<input type="checkbox"
name="onion"
value="hot onion">Onion<br>
<input type="checkbox"
name="bacon"
value="spicy bacon">Bacon<hr>
<input type="button"
value="Order Pizza"
name="orderButton"
onClick="alert('ordered.')">
</form>
<script language="JavaScript">
<!--
document.write(document.orderForm.onion.value);
document.write(" or ",document.orderForm.bacon.value);
-->
</script>
</html>