First, you'll have to add an action (which file to refer when submitted) and preferably a method-type in your form-tag. You will also have to include value of $productName (given from server-side php) inside of your html (look at value attribute)
Do something like this:
html-form: (Examplefile: yourhtmlform.php)
Then in your php-file get value from a specific element like this:
<?php
//File querydb.php (example filename)
//Form is submitted and srch-box is set (only set when form is submitted)
if(isset($_POST['srch-box'])) {
$type = $_POST['srch-box']; //Get value of input-element
}
else {
$type = 'kingkong'; //Default type to search
}
$prepareQuery = mysqli_prepare($dbConnectionLink,"SELECT * FROM XXX WHERE Type=:type");
//...code to fetch results..
//You get a productName (or SKU) from db
if (isset($result['product_name'])) {
$productName = $result['product_name']; //or whatever your column is called
}
else {
$productName = '';
}
include('yourhtmlform.php'); //Observe that it must be php to echo out value of $productName in this included file
I noticed you didn't use prepared-statement. Look for more information on prepared statements here: http://www.php.net/manual/en/mysqli.prepare.php (use them!)
I hope this will help you somehow :-)