Instead of submit get data on entering page php - php

Question

I use this snippet to get vehicle data from a external database:
<form method="post" action="<?php echo $_SERVER['REQUEST_URI'] ?>" class="vwe-kenteken-widget">
<p><input type="text" name="open_data_rdw_kenteken" value="<?php echo $_POST['open_data_rdw_kenteken'] ?>" maxlength="8"></p>
<p><input name="submit" type="submit" id="submit" value="<?php _e('Kenteken opzoeken', 'open_data_rdw') ?>"></p>
</form>
<?php if($data): ?>
<h3><?php _e('Voertuiggegevens', 'open_data_rdw') ?></h3>
<table>
<?php
$categories = array();
foreach ($data as $d) {
if( !is_array($fields) || in_array($d['name'], $fields) ) {
if( !in_array($d['category'], $categories) ) {
$categories[] = $d['category'];
echo '<tr class="open-rdw-header">';
echo '<td colspan="2" style="font-weight: bold;">';
echo ''.$d['category'].'';
echo '</td>';
echo '</tr>';
}
echo '<tr style="display:none">';
echo '<td>'.$d['label'].'</td>';
echo '<td>'.$d['value'].'</td>';
echo '</tr>';
}
}
?>
</table>
<?php endif; ?>
What i want to accomplish is that the data is loaded without the user have to enter a value and hit the submit button. The input value will get loaded based on the product page the user is viewing.
EDIT:
The data is loaded based on:
public function get_json() {
if ( isset( $_POST['kenteken'] ) ) {
$data = $this->rdw->get_formatted($_POST['kenteken']);
foreach ($data as $row) {
$json['result'][$row['name']] = $row['value'];
}
if ($_POST['kenteken']) {
if ($data[0]['value'] == '') {
$json['errors'] = __( 'No license plates found', 'open_data_rdw' );
}
else {
$json['errors'] = false;
}
}
else {
$json['errors'] = __( 'No license plate entered', 'open_data_rdw' );
}
header('Content-type: application/json');
echo json_encode($json);
die();
}
}
So instead of a $_POST action just get the data based on a pre-declared value that is different on each page.

Answer 1

Hard to answer - but I'll try to use my crystal ball.
$data comes from a database query, right?
I assume further, that the query takes the value from the open_data_rdw_kenteken form field to gather $data.
To have the table rendered, you have to fill $data with the right data. That implies that you must have a kind of default value for open_data_rdw_kenteken to get the data out of the DB. The default can be "all" which should reflect on your SQL Query or as your wrote "defined by product page".
Pseudo Code
$data = getData('BT-VP-41');
function getData($open_data_rdw_kenteken="")
{
$where = "";
if(!empty($open_data_rdw_kenteken)) {
$where = 'WHERE rdw_kenteken = "'.mysqli_real_escape_string($open_data_rdw_kenteken)';
}
$data = myslqi->query("SELECT * FROM dbTbl ".$where)
return $data;
}
As I wrote - this is pseudo code and will not run out of the box. You'll have to adapt that to your environment.
TL;DR: The line
<?php if($data): ?>
keeps you from rendering the table. To render you need $data filled with the right data.
Hope that will get you in the right direction.