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

Passing JavaScript Variables to PHP Using Form Submission

To pass JavaScript variables to PHP, submitting a form with the desired variables as input values is a reliable method. PHP code cannot access variables directly from the client-side JavaScript code since PHP executes on the server.

Revised Code Example

Replace the existing code with the following:

<script type="text/javascript">
  function func_load3(name) {
    var form = document.forms["myform"];
    var selectBox = form.select3;
    var selectedOption = selectBox.options[selectBox.selectedIndex];

    var selectedValue = selectedOption.value;
    var selectedText = selectedOption.text;

    // Set the hidden input value
    var hiddenInput = document.getElementById("hidden1");
    hiddenInput.value = selectedValue;

    // Submit the form
    form.submit();
  }
</script>

<form name="myform" action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">
  <input type="hidden" name="hidden1">

PHP Code

<?php
if (isset($_POST['hidden1'])) {
  $salarieid = $_POST['hidden1'];
  // Query the database based on the $salarieid variable
}
?>

In this revised code:

• The JavaScript function func_load3() submits the form upon selection from the dropdown.
• The PHP code retrieves the variable from the submitted form using $_POST['hidden1'].
• You can now use the $salarieid variable to query the database or perform any necessary server-side operations.

The above is the detailed content of How Can I Pass JavaScript Variables to PHP for Server-Side Processing?. For more information, please follow other related articles on the PHP Chinese website!