Option get data from DB - php

Question

I have got this table in my Database:
**train_information**
train_id
country_id
user_id
train_name
tare_weight
number_of_bogies
number_of_axles
wheel_diameter_min
wheel_diameter_max
And then i have 2 .php pages (1 is only for classes)
Selector.php
<!--Selector-->
<form name='form' id='selector'>
<?php
$selector = $database->selector();
?>
<select onchange= "mySelection()" id ="selector" name="selector">
<option selected="true" disabled="disabled">Selecteer een trein</option>
<?php
foreach ($selector as $selector) {
print "<h3>" . $selector['train_id'] . "==" . $selector_id . "</h3>";
if ($selector['train_id'] == $selector_id) {
echo "<option value=" . $selector['train_id'] . " selected='selected'> " . $selector['train_name'] . "</option>";
} else {
echo "<option value=" . $selector['train_id'] . "> " . $selector['train_name'] . "</option>";
} }
?>
</select>
</form>
And then the class.php
function selector() {
$sql = "SELECT train_id, train_name FROM train_information";
$sth = $this->pdo->prepare($sql);
$sth->execute();
return $sth->fetchAll();
}
The selector shows the train names in the selection. so that is good.
But i want that when i select it, and press a button like: Select. That it select the information of that selected train and shows it on the page.
And i don't only want to show 1, but if i would like to select a other train after that, it shows both trains information on the page.
How do i do this?

Answer 1

You can do following
Add this Method to class.php
function select_train_details($trainId) {
$sql = "SELECT * FROM train_information where train_id = " . $trainId;
$sth = $this->pdo->prepare($sql);
$sth->execute();
return $sth->fetchAll();
}
Add Following to selector.php
<form name='form' id='selector'>
<?php
$selector = $database->selector();
if (isset($_POST['selector'])) {
$selectorDetail = $database->select_train_details();
}
?>
<select onchange= "this.form.submit" id ="selector" name="selector">
<option selected="true" disabled="disabled">Selecteer een trein</option>
<?php
foreach ($selector as $selector) {
print "<h3>" . $selector['train_id'] . "==" . $selector_id . "</h3>";
if ($selector['train_id'] == $selector_id) {
echo "<option value=" . $selector['train_id'] . " selected='selected'> " . $selector['train_name'] . "</option>";
} else {
echo "<option value=" . $selector['train_id'] . "> " . $selector['train_name'] . "</option>";
}
}
?>
</select> </form> <?php if (isset($selectorDetail)) {
echo "<pre>";
$selectorDetail; } ?>