Only 1 product at a time in osCommerce
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Over at the official osCommerce forum, someone asked about the possibility of only allowing a buyer to select 1 of each product. My answer was to amend the display of the shopping cart and the shopping cart class...
It's fairly easy. What I am going to show you is amending the display using HTML and CSS, then a bit of PHP code to only add 1 of a product in the class file.
Step 1: Make the quantity box readonly and look nicer.
As someone who has done a lot of HTML over the years I know that the attribute called "readonly" makes an input "read only"! So I add this to the shopping cart page. Open up shopping_cart.php and find
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'text' => tep_draw_input_field('cart_quantity[]', $products[$i]['quantity'], 'size="4"') . tep_draw_hidden_field('products_id[]', $products[$i]['id']));
Change it to:
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'text' => tep_draw_input_field('cart_quantity[]', $products[$i]['quantity'], 'size="4" id="clubosc" readonly="readonly"') . tep_draw_hidden_field('products_id[]', $products[$i]['id']));
You can see that I have added the readonly attribute and given it a css ID called "clubosc".
Step 2: Amend the look of the box using .css
Open up stylesheet.css and add this code;
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#clubosc {
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border: none;
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text-align: center;
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background: transparent;
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}
Add something to the cart and your quantity box now looks like this:
Whereas the usual look is like this:
Now, because we have made the contents of the quantity field readonly, we have to ensure that not more than 1 product can be added. At the moment a buyer could return to the product page, and click "buy" again, ending up with 2 of the same item in his cart.
Step 3: Making only 1 buyable...
Open up /includes/classes/shopping_cart.php and find this line of code:
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$this->update_quantity($products_id_string, $qty, $attributes);
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} else {
Simply change both $qty to (int)1. So you end up with;
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$this->update_quantity($products_id_string, (int)1, $attributes);
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} else {
And that is it. 3 easy steps to allow customers to only buy a maximum of 1 of each product.