How to set checked for all selected checkboxes - select

Question

I have many checkboxes. I want when user clicks submit button and he hasn't filled all required fields, these checkboxes that he has checked, to be checked. My code is the following, but when form submit, only last checkbox is cheked.
function teachers_show(yes, no){
$(".toggle, .all_teachers_show, .student, .school, .teacher_school, .teacher, .class, .teacher_class").hide();
if (no)
$('.all_teachers_show').show();
else
$('.all_teachers_show').hide();
$(":radio").prop('checked',false);
$(yes).prop('checked',true);
}
<?php
echo validation_errors();
echo "<div class='container' id='register_container'>";
echo form_open('home/register');
echo "<table border = '0' >";
echo "<tr><td><label> Username:* </label></td><td>";
$data=array(
'name' => 'username',
'class' => form_error('username') ? 'error' : '',
'value' => set_value('username')
);
echo form_input($data);
echo "</td></tr>";
echo "<tr><td><label> Password:* </label></td><td>";
$data=array(
'name' => 'password',
'class' => form_error('password') ? 'error' : ''
);
echo form_password($data);
echo "<tr><td><label> Choose role:* </label> </td><td>";
$selected_role = $this->input->post('role_id'); ?>
<input type="radio" name="role_id" id="radio1" onclick="showHide(this, true)" value="1"
<?php echo '1' == $selected_role ? 'checked="checked"' :
'' ?>/>
<?php echo " Role 1"; ?>
<input type="radio" name="role_id" id="radio2" onclick="showHide(this, true)" value="2"
<?php echo '2' == $selected_role ? 'checked="checked"' :
'' ?>/>
<?php echo " Role 2 "; ?>
<input type="radio" name="role_id" id="radio5" onclick="teachers_show(this, true)" value="5"
<?php echo '5' == $selected_role ? 'checked="checked"' :
'' ?>/>
<?php echo " Role 3 ";
echo "</td></tr>";
<?php
echo "<tr class='all_teachers_show' style='display:none;'><td><label> Teachers:* </label></td><td>";
?>
<table border='0'>
<tr>
<?php
$ind = 0;
foreach ($all_teachers_show as $row) {
$ind++;
?>
<td>
<?php $selected_teachers = $this->input->post('all_teachers_show[]'); echo $selected_teachers; ?>
<input type="checkbox" id='all_teachers_show' <?php echo set_checkbox('all_teachers_show',$row->user_id); ?> name="all_teachers_show[]"
value="<?= $row->user_id ?>" <?php if ( isset($selected_teachers[$row->user_id] ))
echo 'checked="checked"'; ?>><?= $row->first_name . ' ' . $row->last_name ?> <td>
<?php
if($ind % 3 == 0)
echo '</tr> <tr>';
} ?>
</table>
<?php
echo "</td></tr>";
echo "</div>";
echo "</table><br/>";
$data=array(
"name" => 'mysubmit',
'class' => 'btn btn-success ',
'id' => 'reg',
'value' => 'Register'
);
echo form_submit($data);
?>
</form>
That's my whole code. These chechboxes are for Role 3 - radio button with id='radio5'.
How could it be my if: <?php echo $selected_teachers == $row->user_id ? 'checked="checked"' :
'' ?>
$selected_teachers - it returns array and I compare it with $row->user_id
How could be done that?

Answer 1

try this:
<?php
foreach ($all_teachers_show as $row)
{
$userId = $row->user_id;
$first_name = $row->first_name;
$last_name = $row->last_name;
$teacherSelected = ( isset($_POST[$userId]) ) ? true : false;
?>
<td>
<input
type="checkbox"
class='all_teachers_show'
name="<?php echo $userId; ?>"
<?php
if ( $teacherSelected )
echo 'checked="checked"';
?>
value="<?php echo $userId; ?>"
>
<?php echo $first_name . ' ' . $last_name ?>
<td>
<?php
}