How to get default value from checkbox element?

Question

Below is my code:

<INPUT TYPE="checkbox" NAME="cb" value="1">

After submitting the form, I get cb==1if the item is cbchecked,

I want to receive cb==0if the item is cbnot installed. How to implement it?

BTW: it is not possible to change the receipt page, for example:

if(cb==null)cb=0;// no no no..

I want to implement it on a web interface.

I tried like this:

<INPUT TYPE="hidden" NAME="cb" value="0"> <!--add this line-->
<INPUT TYPE="checkbox" NAME="cb" value="1">

If cbnot checked, it can override <INPUT TYPE="hidden" NAME="cb" value="0">else, I can get cb==0.

but I think this solution is not very good.

any idea? thanks ~ :)

---

Thanks wowo_999 for the comment:

" checkbox , , . , , cb 2x , ". - wowo_999

---

cb "0", , null, : "java.sql.SQLException: " cb " " null ", cb == 0, null. ( cb sql, cb "0".)

Answer 1

, , javascript . , jQuery:

$("input[type=checkbox]").change(function() {
    $(this).attr("value", $(this).attr("checked") ? 1 : 0);
});

, script :

$(function() {
    function updateCheckbox() {
        $(this).attr("value", $(this).attr("checked") ? 1 : 0);
    }
    // Run whenever checkbox is ticked or unticked
    $("input[type=checkbox]").change(updateCheckbox);
    // Run on page load
    updateCheckbox();
});

HTML, - value:

<input type="checkbox" name="cb" />

:

<input type="checkbox" name="cb" checked />

Answer 2

javascript, , 0, . submit.

Answer 3

You can not default to the database "0"?