Multiple text box attached to current Objects array in php

Question

I have list of products in database. I am loading products on page load and then displaying. I will ask user to enter the quantity for each product. Now after submitting the form, I want to retrieve all those quantities against each product. Below is my current code.

<?php
$productList;
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    echo 'Product form submitted';
    foreach ($productList as $product) {
        // Code to retrieve quantity
    }
} else {
    include_once '../classes/OrderService.php';
    $orderService = new OrderService();
    $productList = $orderService->loadProducts();
}

?>

Below is html part.

    <?php foreach ($productList as $product) { ?>


        <b><a href="#" onclick="displayProductDetails('<?php echo $product->getProductName(); ?>');">
        <?php echo $product->getProductName();?></a></b>
        <br/>
        <?php echo $product->getDescription();?>
        <br/>
        <b>Price:</b> &nbsp;&nbsp;&nbsp;<?php echo $product->getPrice(); ?>
        <br/><br/>
        Qantity: <input type="text" style="padding-left: 5px;" name="<?php echo $product->getQuantity(); ?>" size="3" maxlength="3"/>

<?php } ?>

I have two problems here. First is when I submit the form and control goes to submit if block my product list is empty. Why it is empty if I have already populated while loading the page. Also how to get the quantity of every product entered by user.

Thanks in advance.

think1712 · Accepted Answer · 2013-11-26 04:06:01Z

2

Subsequent requests after the first time you have built the page i.e. to submit the quantity of each product, will not automatically have the same data available on the form posting to the same script.

So you will need to perform an update query on a database table which is holding the products, then select them again. (presumably using the OrderService object which you already have built.

Here's a bit of help - although I don't have a whole lot of information about your data storage:

include_once '../classes/OrderService.php';
$orderService = new OrderService();
$productList = $orderService->loadProducts();

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    foreach($productList as $product) {
        if(isset($_POST["quantity_" . $product->getId()])) {
            $product->updateQuantity($_POST["quantity_" . $product->getId());
        }
    }
}

apologies if any of the above produces an error. just typed it out quickly.

a quick note: on your input tag for quantity i'd go with something more descriptive for the name such as a product id or even quantity_<> so you can differentiate between the submissions on the server if you need to update multiple product quantities at once. it's also good practice to give those fields an id with the same value.

it is your "value" attribute which wants to display the actual quantity of products in a users order. e.g.

<input type="text" style="padding-left: 5px;" name="<?php echo $product->getId(); ?>" id="<?php echo $product->getId(); ?>" size="3" maxlength="3" value="<?php echo $product->getQuantity(); ?>"/>

edited Nov 26, 2013 at 4:06

answered Nov 26, 2013 at 3:31

think1712

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3 Comments

javafan Over a year ago

I understood about your second part about input tag. About first part, you want to say that I need to again load the products and then find the products with quantity greater than 0?

think1712 Over a year ago

each request to the server is independent of the last, due to the stateless nature of the web. So even though you loaded the data to display the initial form. The next request is a new request with no idea what the first one was. You will need to update the products in a database (presuming you have a database) or other storage means. Then once you have updated them, select them again to rebuild your page.

javafan Over a year ago

I get that. Thanks a lot.

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