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You'll need to look into AJAX.

Basically, using JavaScript you trigger a call (ajax or fetch) to a php script on your server - in the call you pass the selected value. The php script will use this passed value to determine what to show in the next drop-down and return that to the JavaScript which will then display that data to the user as a second drop-down.

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include_once "configdb.php";




<!DOCTYPE html>

<html lang="en">


    <meta charset="UTF-8">

    <meta http-equiv="X-UA-Compatible" content="IE=edge">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">





<select name="category" id="category">

<option value="">Select Category</option>



        $query = "SELECT * FROM category";

        $result = $conn->query($query);

        if ($result->num_rows > 0) {

            while ($row = $result->fetch_assoc()) {

                echo "<option value='{$row["cat_id"]}'>{$row['cat_name']}</option>";



                echo "<option value=''>Category not available</option>"; 











How do I capture the selected value and post that value to another table.

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