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Editorial Team
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Asked: 2026-05-24T09:47:55+00:00

I’ve created a webpage which uses JQuery to redirect the content of a form

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I’ve created a webpage which uses JQuery to redirect the content of a form to another webpage using PHP to connect to a database to find some content and put it back on the first page.

Eveything works great (thanks to the help of followers of stack overflow 🙂 ) but now I’d like the following : I’m asking for the postal code of a city, if I’m lucky this postal code is unique (only one city has it) but it also happens that a postal code is the same for several cities so I’d like in that case to display a listbox for the user to choose his/her city.
Does someone has an idea of how to do this ?

my code :

home.html

<!DOCTYPE html>
<html>
<head>
  <script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
  <form action="/" id="myform">
   <input type="text" name="postal_code" id="postal_code" placeholder="Search..." />
   <input type="submit" value="Search" />
  </form>
  <!-- the result of the search will be rendered inside this div -->
  <div id="result"></div>

<script>
$('#myform').submit(function() {
   var url = 'target.php';
   var postal_code = $('#postal_code').val();
   $.post( url, { postal_code: postal_code },
      function( data ) {          
          $( "#result" ).empty().append( data );
      }
    );
   return false;
});

target.php

<?php
try
{
   $pdo_options[PDO::ATTR_ERRMODE] = PDO::ERRMODE_EXCEPTION;
   $bdd = new PDO('mysql:host=localhost;dbname=mydatabase', 'root', '', $pdo_options);
   $response = $bdd->prepare('SELECT city FROM city_list where postal_code = ?');
   $response->execute(array($_POST['postal_code']));
   echo '<ul>';
       while ($data = $response->fetch())
       {
   ?>
          <br/>The city you entered the postal code is : <?php echo $data['city'];  
       }
       $response->closeCursor();
}
catch (Exception $e)
{
        die('Error : ' . $e->getMessage());
}
?>

EDIT:

This is the code ok for my needs. I’d only to make some very minor changes from Jules’ code to make it ok (for an unknow reason his answer worked perfectly for him but not for me 🙂 )

<?php
try {
//Get the postal code:
$postcode = $_POST['code_postal'];

//Make MySQL connection
mysql_connect("localhost", "root", "") or die (mysql_error());

//Select the database
mysql_select_db("site_artisans_amélioré");

//Do your query based on the postcode...
$query = "SELECT ville FROM liste_communes_code_postaux where code_postal = '" . mysql_real_escape_string($postcode) . "'";

//Return the response in a variable
$data = mysql_query($query) or die (mysql_error());
//echo "Num rows: " . mysql_num_rows($data);

//Check how many rows the query returned. If more than 1 that means several cities
//exist for one postcode, so you should show a listbox.
//If not, just return the ville name
if (mysql_num_rows($data) > 1) { ?>
    <select name="cities">
<?php  while ($row = mysql_fetch_assoc($data)) {  ?>
        <option value="<?php echo $row['ville']?>"><?php echo $row['ville']?></option>
<?php  } ?>
    </select>    
<?php }
else {
    $row = mysql_fetch_assoc($data);
    echo $row['ville'];
    }
}
catch (Exception $e) {
   die("Error : " . $e->getMessage());
}
?>
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1 Answer

  1. Editorial Team

    I am not sure which library you are using for your Database queries, so I’ll do it in Pseudo-code and mysql_query..

    target.php

    <?php
try {
    //Get the postal code:
    $postcode = $_POST['postal_code'];

    //Make MySQL connection
    mysql_connect("localhost", "username", "password") or die (mysql_error());

    //Select the database
    mysql_select_db("mydatabase");

    //Do your query based on the postcode...
    $query = "SELECT city FROM city_list where postal_code = '" . mysql_real_escape_string($postcode) . "'";

    //Return the response in a variable
    $data = mysql_query($query);

    //Check how many rows the query returned. If more than 1 that means several cities
    //exist for one postcode, so you should show a listbox.
    //If not, just return the city name
    if (mysql_num_rows($data) > 1) { ?>
        <select name="cities" multiple="multiple">
    <?  while ($row = mysql_fetch_assoc($data)) {  ?>
            <option value="<?=$row['city']?>"><?=$row['city']?></option>
    <?  } ?>
        </select>    
 <? }
    else {
        $row = mysql_fetch_assoc($data);
        echo $row['city'];
    }
}
catch (Exception $e) {
    die("Error : " . $e->getMessage());
}
?>

    I hope you catch my drift and you can complete it yourself.

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