How can you use window.opener in PHP to interact between a popup window and the main form?

To interact between a popup window and the main form in PHP using window.opener, you can pass data from the popup window to the main form by accessing the window.opener object in JavaScript. You can use window.opener.document.getElementById() to access elements in the main form and update their values based on data from the popup window. 

<?php
if(isset($_POST['data_from_popup'])){
    // Process data received from the popup window
    $data = $_POST['data_from_popup'];
    
    // Update main form elements using JavaScript
    echo "<script>window.opener.document.getElementById('main_form_element_id').value = '$data';</script>";
}
?>

Keywords

window.opener PHP popup window interaction main form

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