How to change the initial price on the OpenCart product page?

Question

Without using the admin panel. I want to be able to change the price of an item in OpenCart on the product page.

Basically, I have an option called Bespoke/Custom: which is a text box. If the customer enters something here, I want to be able to change the price that I am already doing through jQuery, and then I want this new hidden field with the price to redefine the price of the goods for this customer order.

Is it possible? Is there an extension where I can let the customer enter their price, then I could hide this field and update through jQuery, etc.

This is a link to some other posts Using an alternative price field in OpenCart , as well as about this link model http://forum.opencart.com/viewtopic.php?t=36052 , which shows where the main functions of oop, but quite extensively do it

Answer 1

OK, to point the right direction, here's how I do it:

1. hidden input
As you know, in catalog/view/theme/default/template/product/product.php there is an AJAX request to add a product to the cart:

 $('#button-cart').bind('click', function() { $.ajax({ url: 'index.php?route=checkout/cart/add', type: 'post', data: $('.product-info input[type=\'text\'], .product-info input[type=\'hidden\'], .product-info input[type=\'radio\']:checked, .product-info input[type=\'checkbox\']:checked, .product-info select, .product-info textarea'), dataType: 'json', // ... }); }); 

If you look at the data parameter, you will see that all inputs, selections, text fields, etc. that are present in the .product-info div are filled and sent to PHP.

Therefore, I would provide hidden input with a custom price value in this .product-info div so that there is no need to modify the AJAX request at all. Let say that the name of this input will be custom_price .

2. checkout/cart/add
Open catalog/controller/checkout/cart.php and find the add method. Here all the magic must be done. After this piece of code:

  if (isset($this->request->post['option'])) { $option = array_filter($this->request->post['option']); } else { $option = array(); } 

I would add the following:

  if(isset($this->request->post['custom_price']) && $this->isCustomPriceValid($this->request->post['custom_price'])) { $custom_price = $this->request->post['custom_price']; } else { $custom_price = false; } 

Implement the isCustomPriceValid() method to meet your requirements ... and go to the last edit here - change this line:

 $this->cart->add($this->request->post['product_id'], $quantity, $option); 

in

 $this->cart->add($this->request->post['product_id'], $quantity, $option, $custom_price); 

3. Trolley
Now open this file: system/library/cart.php and find the add method again. You will need to change the method definition to this:

 public function add($product_id, $qty = 1, $option = array(), $custom_price = false) { 

Before the last line of code in this method, add another one:
(this code has been edited due to a comment from OP)

  // ... if($custom_price) { if(!isset($this->session->data['cart']['custom_price'])) { $this->session->data['cart']['custom_price'] = array(); } $this->session->data['cart']['custom_price'][$key] = $custom_price; } $this->data = array(); // <- last line } 

The last edit should be in the getProducts() method, since it loads all the data from the database and sends it to other controllers to display the goals.

Now I don’t know if your user price should overwrite the price of the price + price or only the price, so the option price will be added to it, so I stick to the second choice, because it is more descriptive, and the first choice could be easily extracted from my example .

String search

 $price = $product_query->row['price']; 

and immediately after adding

 if(isset($this->session->data['cart']['custom_price'][$key])) { $price = $this->session->data['cart']['custom_price'][$key]; } 

Now the price should be overwritten by the user. Check further that the price of the product is later set as:

 $this->data[$key] = array( // ... 'price' => ($price + $option_price), // ... ); 

So, if you want to rewrite the entire price using a custom one, add this condition immediately after this array, like this (instead of $price = ...; ):

 if(isset($this->session->data['cart']['custom_price'][$key])) { $this->data[$key]['price'] = $this->session->data['cart']['custom_price'][$key]; } 

It should be. I have not tested the code; it may or may not work with minor changes. I worked with OC 1.5.5.1. This should only indicate the right direction (although assuming that the finish is not so far).

Enjoy it!

Answer 2

- "This should only point you in the right direction (at the same time, consider that the finish is not so far). @Shadyyx"

Thanks @shadyyx - for the right approach ... I managed to get it to work, and here's how to do it:

 if(isset($this->session->data['cart']['custom_price'][$key])) { $this->data[$key]['price'] = $this->session->data['cart']['custom_price'][$key]; } 

it should be:

 if(isset($this->session->data['custom_price'][$key])) { $this->data[$key]['price'] = $this->session->data['custom_price'][$key]; } 

Thanks again, and I hope someone finds this helpful.