Loop a list of checkboxes that some probabbly are not checked in PHP

Question

I have a HTML schema like this:

enter image description here

CheckBox names: Lunes column name = arrayLunes[] then, Martes column name = arrayMartes[], etc...

First, I want to test Lunes list (monday), if I have checked the first and the third, the array will have only [0] and [1] array positions, but I want for example: [0] = true, [1] = false, [2] = true, [3 .. x] = false

Something like this PHP Code, that obviously won't work, because if a checkbox is not checked will not send by POST, so it will be index offset error

for ($c = 0; $c < count($_POST['arrayLunes']); $c++)
    echo ($_POST['arrayLunes'][$c] == 'on' ? "YES" : "NO");

Conclusion: So, now, the $_POST['arrayLunes'] variable only will contain in order the checkbox checked and I need the not checked one too, in his respective position.

How can I do or how can I simulate it?

EDIT

My HTML code is something like this

<div style="margin-left: 5px; padding: 5px;">
    <input class="btnFranjas" type="button" value="- Quitar franja" onclick="removerFranjaCalendario();" />
    <input class="btnFranjas" type="button" value="+ Añadir franja" onclick="addFranjaCalendario();" />
    <input class="btnFranjas" type="button" value="Reestablecer" onclick="reestablecerFranja();" />
</div>
<form action="index.php?zona=plataforma&id=<?php echo $_GET['id']; ?>&acceso=<?php echo $_GET['acceso']; ?>" method="post">
    <table id="tablaCalendario">
        <thead>
            <th>Horario</th>
            <th>Lunes</th>
            <th>Martes</th>
            <th>Miércoles</th>
            <th>Jueves</th>
            <th>Viernes</th>
            <th>Sábado</th>
            <th>Domingo</th>
        </thead>
        <tbody>
            <tr style="background: #E0E6F8;">
                <td>
                    <table>
                        <tr>
                            <td><b>Inicio: </b></td>
                            <td>
                                Hora
                                <select id='arrayInicioHora[]' name='arrayInicioHora[]'>
<?php
                                    for ($c = 0; $c < 24; $c++)
                                        echo "    <option value='" . $c . "'>".($c > 9 ? $c : "0" . $c)."</option>";
?>
                                </select>
                            </td>
                            <td>
                                Minuto
                                <select id='arrayInicioMinuto[]' name='arrayInicioMinuto[]'>
<?php
                                    for ($c = 0; $c < 60; $c++)
                                        echo "<option value='" . $c . "'>".($c > 9 ? $c : "0" . $c)."</option>";
?>
                                </select>
                            </td>
                        </tr>
                        <tr>
                            <td><b>Fin: </b></td>
                            <td>
                                Hora
                                <select id='arrayFinHora[]' name='arrayFinHora[]'>
<?php
                                    for ($c = 0; $c < 24; $c++)
                                        echo "<option value='" . $c . "'>".($c > 9 ? $c : "0" . $c)."</option>";
?>
                                </select>
                            </td>
                            <td>
                                Minuto
                                <select id='arrayFinMinuto[]' name='arrayFinMinuto[]'>
<?php
                                    for ($c = 0; $c < 60; $c++)
                                        echo "    <option value='" . $c . "'>".($c > 9 ? $c : "0" . $c)."</option>";
?>
                                </select>
                            </td>
                        </tr>
                    </table>
                </td>
                <td align="center"><input type="checkbox" name="arrayLunes[]" id="arrayLunes[]" value="0" /> <input type="text" placeholder="Valor" name="arrayValorLunes[]" id="arrayValorLunes[]" style="width: 60px;" /></td>
                <td align="center"><input type="checkbox" name="arrayMartes[]" id="arrayMartes[]" value="0" /> <input type="text" placeholder="Valor" name="arrayValorMartes[]" id="arrayValorMartes[]" style="width: 60px;" /></td>
                <td align="center"><input type="checkbox" name="arrayMiercoles[]" id="arrayMiercoles[]" value="0" /> <input type="text" placeholder="Valor" name="arrayValorMiercoles[]" id="arrayValorMiercoles[]" style="width: 60px;" /></td>
                <td align="center"><input type="checkbox" name="arrayJueves[]" id="arrayJueves[]" value="0" /> <input type="text" placeholder="Valor" name="arrayValorJueves[]" id="arrayValorJueves[]" style="width: 60px;" /></td>
                <td align="center"><input type="checkbox" name="arrayViernes[]" id="arrayViernes[]" value="0" /> <input type="text" placeholder="Valor" name="arrayValorViernes[]" id="arrayValorViernes[]" style="width: 60px;" /></td>
                <td align="center"><input type="checkbox" name="arraySabado[]" id="arraySabado[]" value="0" /> <input type="text" placeholder="Valor" name="arrayValorSabado[]" id="arrayValorSabado[]" style="width: 60px;" /></td>
                <td align="center"><input type="checkbox" name="arrayDomingo[]" id="arrayDomingo[]" value="0" /> <input type="text" placeholder="Valor" name="arrayValorDomingo[]" id="arrayValorDomingo[]" style="width: 60px;" /></td>
            </tr>
        </tbody>
    </table>
    <input class="orangebutton" type="submit" name="enviarCalendario" id="enviarCalendario" onclick="return confirmacionAccion();" value="Enviar calendario" />
</form>

And my javascript for this sampe: http://pastebin.com/eKFwMFvD

Tobias Golbs · Accepted Answer · 2013-07-10 15:42:11Z

3

There is a trick so you always receive a value for a checkbox:

<input type="hidden" name="arrayLunes[1]" value="0">
<input type="checkbox" name="arrayLunes[1]" value="1">

<input type="hidden" name="arrayLunes[2]" value="0">
<input type="checkbox" name="arrayLunes[2]" value="1">

So if the checkbox is checked you receive 1 as value and if not you will get the 0.

EDIT:

Like Daniel said you have more than one arrayLunes. So you have to add an index manually to the array notation. See above.

To iterate through your checkboxes do this:

foreach($_POST['arrayLunes'] as $val)
    echo $val ? "YES" : "NO";

edited Jul 10, 2013 at 15:42

answered Jul 10, 2013 at 15:35

Tobias Golbs

4,6164 gold badges31 silver badges50 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Alejandro L. Over a year ago

I have the property value assigned to the "position" that it should be, but I don't find the proper PHP algorithem to do it properly, PS: now I get your point, I'm going to try it.

Tobias Golbs Over a year ago

@Daniel: Why this won't work? Now he has always a value to all checkboxes and can iterate through them without risking index offset error EDIT: Ok now i understand. Changed the name of the checkboxes.

Alejandro L. Over a year ago

so if I do arrayLunes[] it wont work? I must write the index? I say it because I'm adding rows and deleting rows by javascript and I need to do it more simple I can do it.

Tobias Golbs Over a year ago

No you can't if you want to receive a value for every existing checkbox. If you add or remove a row, simply iterate through all existing rows and reset the index.

Alejandro L. Over a year ago

Okay, it is working as I desired, I put un the checkbox value, the position where it is, and then in the hidden i put -1 (because I use the 0 as the first position), so if I find -1 is unchecked, thanks for that tip.

DaveRandom · Accepted Answer · 2013-07-10 15:43:41Z

3

The best solution to this, in my opinion, is to use isset() instead of a comparison with the value of the checkbox.

However, in order to do this, you will need to know through some other mechansim how many checkboxes are on the page.

So when you are generating the page, I suggest you add:

<input type="hidden" name="rowcount" value="<?=$x?>">

...somewhere within the form that contains the table rows, where $x is the number of rows created on the page.

That way, the code that receives the form can simply do this:

for ($c = 0, $count = (int) $_POST['rowcount']; $c < $count; $c++)
{
    echo isset($_POST['arrayLunes'][$c]) ? "YES" : "NO";
}

answered Jul 10, 2013 at 15:43

DaveRandom

88.8k11 gold badges159 silver badges174 bronze badges

Comments

Alexandre Danault · Accepted Answer · 2013-07-10 15:43:30Z

1

If you have a unique ID in your DB for each row, add it in the parenthesis for each column, combined with the hidden element trick to always get the POST:

<input type="hidden" name="arrayLunes[1]" value="0" />
<input type="checkbox" name="arrayLunes[1]" value="1" />

<input type="hidden" name="arrayLunes[2]" value="0" />
<input type="checkbox" name="arrayLunes[2]" value="1" />

answered Jul 10, 2013 at 15:43

Alexandre Danault

8,6923 gold badges34 silver badges35 bronze badges

2 Comments

Alejandro L. Over a year ago

It's in order to insert in the database, all is handled by javascript, adding/deleting rows, and then I have to check everything if checked or not in php.

Alexandre Danault Over a year ago

If rows are added by javascript, it is just as easy to manage the ID there instead of in the DB. Start a counter variable at 1 (or biggest ID displayed if you loaded data) and add 1 for every new row added.

Community · Accepted Answer · 2017-05-23 12:23:34Z

1

Try this,

foreach($_POST['arrayLunes']) as $index=>$value)
    echo ($value == 'on' ? "YES" : "NO").' index='.$index;

Read getting a checkbox array value from POST

edited May 23, 2017 at 12:23

CommunityBot

11 silver badge

answered Jul 10, 2013 at 15:41

Rohan Kumar

40.7k11 gold badges81 silver badges111 bronze badges

2 Comments

Alejandro L. Over a year ago

I don't use a foreach because I wanted to know the index in purpouse, just for testing, and the main problem is that if a checkbox is not checked, the post array wont store it, so I need to have stored but with false value.

Rohan Kumar Over a year ago

Test the above I've made changes in it.

Ivan Yonkov · Accepted Answer · 2013-07-10 16:01:54Z

1

I have no idea how your HTML is built, but let's say you have these checkboxes:

<input type="checkbox" name="check[]" value="a" />
<input type="checkbox" name="check[]" value="b" />
<input type="checkbox" name="check[]" value="c" />
<input type="checkbox" name="check[]" value="d" />
<input type="checkbox" name="check[]" value="e" />

In this case, if all of them are posted, $_POST['check'] will contain 0=>a, 1=>b and so on.

If only first and last are checked you will have 1=>a, 2=>e, and you need to see which are not checked (b,c,d)

My solution is the following:

Get from the HTML all the checkboxes and compare to the posted ones:

$doc = new DOMDocument();
$doc->loadHTMLFile('test6.php');
$cboxes = $doc->getElementsByTagName('input');
foreach ($cboxes as $cbox) {
       if($cbox->getAttribute('type') == 'checkbox') {
           $cb[] = $cbox->getAttribute('value');
       }
}
$differences = array_diff($cb, $_POST['check']);
var_dump($differences);

If a and e are posted, this will output:

array (size=3)
  1 => string 'b' (length=1)
  2 => string 'c' (length=1)
  3 => string 'd' (length=1)

I forgot to mention it can track the difference in array keys too, not only the values, for example if b and c are posted (1 and 2 keys), the output will be:

array (size=3)
  0 => string 'a' (length=1)
  3 => string 'd' (length=1)
  4 => string 'e' (length=1)

so unposted keys are 0,3,4

$differences = array_diff($cb, $_POST['check']);
var_dump($differences); // unposted checkboxes with relevant keys
$diff1 = array_diff($cb,$differences);
var_dump($diff1); // posted checkboxes with relevant keys

edited Jul 10, 2013 at 16:01

answered Jul 10, 2013 at 15:51

Ivan Yonkov

7,0291 gold badge20 silver badges25 bronze badges

5 Comments

Ivan Yonkov Over a year ago

It doesn't matter how checkboxes are generated, you will only need one more check if($cbox->getAttribute('name') == 'arrayLunes[]') { to compare to $_POST['arrayLunes'] (array_diff) and arrayMartes[] to its $_POST['arrayMartes'];

Ivan Yonkov Over a year ago

see my last edit, differencing one more time the output can produce you the posted checkboxes with they relevant keys in the order

Alejandro L. Over a year ago

In any case I edited my post so probably you'll get more information about what I'm doing, I'm reading all answers and testing yet

Ivan Yonkov Over a year ago

tell me if you find any difficulcies

Alejandro L. Over a year ago

I think that solution is very difficult, see the TobiasKun answer, it's very simple and working, thanks for your help anyway =)

Salketer · Accepted Answer · 2013-07-10 15:35:05Z

0

The easiest workaround this is to use an hidden input as value=0 let's say that has the same name as the checkbox following it.

If the checkbox is checked, you will see its value, if not, the input's value will then be used.

answered Jul 10, 2013 at 15:35

Salketer

15.8k2 gold badges32 silver badges64 bronze badges

Comments

Laurence · Accepted Answer · 2013-07-10 15:37:53Z

0

IF you dont want to use JS - you could do this

<input type="hidden" name="arrayLunes" value="0" />
<input type="checkbox" name="arrayLunes" value="1" />

This way you always receive a $_POST for a checkbox value

answered Jul 10, 2013 at 15:37

Laurence

60.2k22 gold badges178 silver badges215 bronze badges

Collectives™ on Stack Overflow

Loop a list of checkboxes that some probabbly are not checked in PHP

7 Answers 7

5 Comments

Comments

2 Comments

2 Comments

5 Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

7 Answers 7

5 Comments

Comments

2 Comments

2 Comments

5 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related