Selection box insert multiple times in database - php

Question

This is what the page looks like:
And this is what the database looks like:
Now, I had this all working with textfields. (When you press save, the text fields get inserted in the bogie_nr.
Now, I don't want to have text fields but checkboxes.
So, if I select the first 2 checkboxes, and press save. I want the database to insert the number 1 by the axle_nr 1 and 2.
Now, I want the first 2 boxes to be disabled (So you can't check them again).
Now when you select the 3rd and 4th box, and press save. I want the database to insert the number 2 by the 3rd and 4th axle_nr.
When everything is filled in, I want a button that redirects me to a new page.
How do I do this?
Code (for the checkboxes only):
<tr>
<?php
$show_axle = $database->bogies($_GET['train_id']);
foreach($show_axle as $bogiebox){ ?>
<input type='hidden' name='bogie_id[<?php echo $bogiebox['bogie_id']?>]' value='<?php echo $bogiebox['bogie_id']?>'>
<td>
<input type='checkbox' id="bogie_axle_fields" name='bogie_nr[<?php echo $bogiebox['bogie_id']?>]' placeholder = "enter bogie number">
</td>
<?php
}
?>
</tr>
Function:
function bogies($id){
$sql = "SELECT * FROM bogie WHERE train_id = :id2";
$sth = $this->pdo->prepare($sql);
$sth->bindParam(":id2", $id, PDO::PARAM_STR);
$sth->execute();
return $sth->fetchAll();
}
EDIT:
Behind my save button is right now a page: end_result.php . Right there I have a function:
function update_bogie($id) {
$sql = "UPDATE bogie SET bogie_nr = :bogie_nr WHERE bogie_id = :bogie_id";
$sth = $this->pdo->prepare($sql);
$sth->bindParam(':bogie_id', $id, PDO::PARAM_INT);
$sth->bindParam(":bogie_nr", $_POST['bogie_nr'][$id], PDO::PARAM_STR);
$sth->execute();
}
This updates the bogie table (Works when I change the checkboxes to textfields)
What i want now:
Checkboxes. When I check the first 2 boxes, and press save. I want the number 1 to be inserted 2 times for axle 1 and 2 in the database.
After that, I want the first 2 boxes to be disabled selected. So you can't select them once again.
EDIT:
What the ids look like:
THE ALMOST WORKING EDIT:
Okay, so the checkboxes now insert in the database. Also they are disabled when they are inserted in the database.Only a few problems now:
When i insert them for the first time. The value = 1. But on the
2nd insert it also is 1. while it should be 2.
I need to refresh the page in order to see wich select boxes are
disabled. I want this to happen immediately.
When i insert new values. the old (Disabled one) go back to NULL. But it should keep the old value.
Code i have now:
<form method='POST'>
<input type="hidden" value="true" id="y" name="y">
<div id="axle_bogie_border">
<div id="train_adjusted">
<h2>
Train
</h2>
</div>
<table id="distance_margin">
<div id="bogiebox">
<tr>
<?php
$x = 1;
foreach($show_axle as $bogiebox){ ?>
<input type='hidden' name='bogie_id[<?php echo $bogiebox['bogie_id']?>]' value='<?php echo $bogiebox['bogie_id']?>'>
<td>
<?php
if($bogiebox['bogie_nr'] == ''){
?>
<input type='checkbox' id="bogie_axle_fields" value="<?= $x ?>" name='bogie_nr[<?php echo $bogiebox['bogie_id']?>]' placeholder = "enter bogie number"></td>
<?php
}
else{
?>
<input type='checkbox' id="bogie_axle_fields" checked disabled value="<?= $x ?>" name='bogie_nr[<?php echo $bogiebox['bogie_id']?>]' placeholder = "enter bogie number"></td><?php } }
?>
</tr>
</div>
</table>
<input type='submit' id="add_train_button1" value='Save'>
<?php
if(isset($_POST['y'])){
$validbogies = false;
//validate
if(($_POST['bogie_id']) >0){
if($_POST['bogie_id'] >0){
$validbogies = true;
}elseif($_POST['bogie_id'] <= 0){
echo "Error!";
}
else{
echo "Error!." . "<br>";
}
}else{
echo "Error!" . "<br>";
}
//If valid, then insert.
if($validbogies){
foreach($_POST['bogie_id'] as $id) {
$update_axle = $database->update_bogie($id);
}
$x++;
unset($_POST['y']);
echo "Yea! Things have been moved to the database :)";
}
}
?>
</div>
</form>
And the function is still the same as the old one.
EDIT:
Here a example:

Answer 1

<?php
$show_axle = $database->bogies($_GET['train_id']);
// First question : When everything is filled in,
// i want a button that redirects me to a new page.
if(count($show_axle) == 4)
echo "<button type=\"button\" onClick=location.href=''>Click Me!</button>";
// Second question :
// WE display the missing checkboxes
// We will display until we found the first value axle_nr
// (i.e. the checkbox the user click last time)
// when we found we need to move to the next value of axle_nr
else
{
$j = 0;
for($i = 0; $i < 4; ++$i)
{
if($show_axle[$j]['axle_nr'] != ($i + 1))
{
echo "<input type='hidden' name='bogie_id[" .
$bogiebox['bogie_id']. "]' value='" .
$bogiebox['bogie_id'] . "'><td>";
echo "<input type='checkbox' id='bogie_axle_fields'
name='bogie_nr[" . $bogiebox['bogie_id'] .
"]' placeholder='enter bogie number'></td>";
}
else
++$j;
}
?>
That should do it (mb some mistakes on echo but algorithm is ok).

Answer 2

In the code behind your save button try this: (I am assuming the id's for your checkboxes are like this: bogie_nr[455]
function update_bogie($id) {
$sql = "UPDATE bogie SET bogie_nr = :bogie_nr WHERE bogie_id = :bogie_id";
$sth = $this->pdo->prepare($sql);
$sth->bindParam(':bogie_id', $id, PDO::PARAM_INT);
if(isset($_POST['bogie_nr' . '[' . $id .']' ]){
$sth->bindParam(":bogie_nr", $_POST['bogie_nr' . '[' . $id .']' ], PDO::PARAM_STR);
}
else {
$sth->bindParam(":bogie_nr", 'NULL', PDO::PARAM_STR);
}
$sth->execute();
}
EDIT FOR CORRECT NUMBER:
Mitch to get your number try doing a query like this:
SELECT COUNT(*)
FROM bogie
WHERE train_id = #youridhere;
This will return you the amount of bogies you already have for that train, just do +1 or +2 depending on how many elements you are adding (use a counter in your for loop) and you have your correct number to insert