Update MySQL if checkbox Unchecked - php

Question

I am using the script found here to update my database if a box is checked.
https://stackoverflow.com/posts/4592766/revisions
It works if I check an unchecked box.
However, I can't seem to get it working if I uncheck a checked box. It will not update the database.
Here is the modified code:
$(document).ready(function() {
$("input[type=checkbox]").click(function() {
var isSel = this.checked;
var isNotSel = this.unchecked; //added
$.ajax({
url: 'file.php',
type: 'POST',
dataType: 'json',
data: {
id : this.id,
isSelected : isSel,
isNotSelected : isNotSel // added
},
success: function(data) {
alert('updated');
},
error: function() {
alert('error');
}
});
});
});
This is the code showing the checkboxes (created from database):
if($status == 'pending')
{ echo '<input type="checkbox" name="status" id='.$submission_id.' >' .
$task_name . '<br>'; }
if($status == 'done')
{ echo '<input type="checkbox" name="status" id='.$submission_id.' checked>'
. $task_name . '<br>'; }
Here is the code for file.php
if ($_POST && isset($_POST['isSelected'])) {
$sql = 'UPDATE ft_form_53 SET status = "done" WHERE submission_id = ' . $_POST['id'];
// check if the query was executed
if(mysql_query($sql, $link)){
// everything is Ok, the data was inserted
print(1);
} else {
// error happened
print(0);
}
}
if ($_POST && isset($_POST['isNotSelected'])) {
$sql = 'UPDATE ft_form_53 SET status = "pending" WHERE submission_id = ' . $_POST['id'];
// check if the query was executed
if(mysql_query($sql, $link)){
// everything is Ok, the data was inserted
print(1);
} else {
// error happened
print(0);
}
}
No error message is thrown. Any ideas?

Answer 1

Change
var isNotSel = this.unchecked;
to
var isNotSel = !isSel;
or
var isNotSel = !this.checked;
Checkboxes don't have an unchecked property. They have a boolean checked property (true if checked, false if not). And you've already grabbed that into isSel, so...

Answer 2

Got it working. Thanks to shehary for the click to change modification and to T.J. Crowder for the !this.checked tip. I ended up using two separate scripts but it works :) Thanks again to all!
The one below is for uncheck.
$(document).ready(function() {
$("input[type=checkbox]").change(function() {
var isNotSel = !this.checked;
$.ajax({
url: 'file.php',
type: 'POST',
dataType: 'json',
data: {
id : this.id,
isNotSelected : isNotSel
},
success: function(data) {
alert('updated');
},
error: function() {
alert('error');
}
});
});
});