How Can I Successfully Pass JavaScript Variables to PHP for Server-Side Processing?-PHP Tutorial-php.cn

How Can I Successfully Pass JavaScript Variables to PHP for Server-Side Processing?

Barbara Streisand

Release： 2024-12-23 19:44:25

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How Can I Successfully Pass JavaScript Variables to PHP for Server-Side Processing?

Passing JavaScript Variables to PHP

In this scenario, you're encountering an issue attempting to access the value of $_POST['hidden1'] in your PHP code. Despite setting the value of the hidden input field hidden1 through JavaScript, you're not able to retrieve it.

The reason for this is that PHP code executes server-side, while JavaScript operates on the client-side. Therefore, JavaScript variables cannot be directly accessed by PHP code running on the server.

To pass variables from JavaScript to PHP, you need to use a different mechanism, such as submitting the HTML form using either the GET or POST methods. Below is an example demonstrating how this can be achieved:

<!DOCTYPE html>
<html>
  <head>
    <title>My Test Form</title>
  </head>

  <body>
    <form method="POST">
      <p>Please, choose the salary id to proceed result:</p>
      <p>
        <label for="salarieids">SalarieID:</label>
        <?php
          $query = "SELECT * FROM salarie";
          $result = mysql_query($query);
          if ($result) :
        ?>
        <select>

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In this revised version of the code:

The form submits the chosen salary ID to the same page using the POST method.
The isset($_POST['salaried']) condition checks if the form has been submitted.
Upon form submission, a new query is executed to retrieve the corresponding salary information, which is then displayed in a table.

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