How to increase/decrease quantity in cart

Nicolas,

I'm trying to achieve a feature in the cart view that allows the user to increase/decrease the quantity in steps of 1. Or to delete the product entirely.

I've changed the code to this:


<input id="hikashop_checkout_quantity_<?php echo $row->cart_product_id;?>" type="text" name="item[<?php echo $row->cart_product_id;?>]" class="hikashop_product_quantity_field" value="<?php echo $row->cart_product_quantity; ?>" onchange="this.form.submit(); return false;" />
<?php if($this->params->get('show_delete',1)){ ?>
<a href="<?php echo hikashop::completeLink('product&task=updatecart&product_id='.$row->product_id.'&quantity=0&return_url='.urlencode(base64_encode(urldecode($this->params->get('url'))))); ?>" onclick="var qty_field = document.getElementById('hikashop_checkout_quantity_<?php echo $row->cart_product_id;?>'); qty_field.value=0; qty_field.form.submit(); return false;" ><img src="<?php echo HIKASHOP_IMAGES . 'delete2.png';?>" border="0" title="totally remove from cart" alt="totally remove product" /></a>
<?php } ?>
<?php if($this->params->get('show_delete',1)){ ?>
<a href="<?php echo hikashop::completeLink('product&task=updatecart&product_id='.$row->product_id.'&quantity=0&return_url='.urlencode(base64_encode(urldecode($this->params->get('url'))))); ?>" onclick="var qty_field = document.getElementById('hikashop_checkout_quantity_<?php echo $row->cart_product_id;?>'); qty_field.value=qty_field.value + 1; qty_field.form.submit(); return false;" ><img src="<?php echo HIKASHOP_IMAGES . 'add1.png';?>" border="0" title="add 1 unit to cart" alt="add 1 product" /></a>
<?php } ?>
<?php if($this->params->get('show_delete',1)){ ?>
<a href="<?php echo hikashop::completeLink('product&task=updatecart&product_id='.$row->product_id.'&quantity=0&return_url='.urlencode(base64_encode(urldecode($this->params->get('url'))))); ?>" onclick="var qty_field = document.getElementById('hikashop_checkout_quantity_<?php echo $row->cart_product_id;?>'); qty_field.value=qty_field.value - 1; qty_field.form.submit(); return false;" ><img src="<?php echo HIKASHOP_IMAGES . 'subtract1.png';?>" border="0" title="remove 1 unit from cart" alt="remove 1 product" /></a>

All is showing well and the functions remove completely and subtract work correctly. However when I try to add something strange happens. Suppose the old value of the quantity field is 8. When I press the add button it shortly shows in the quantity field 81 instead of 9 Then the page refreshes and the value shows 10. I've tried this with several numbers. So if the old value was 12 and I press add, it shows 121, then refreshes and shows 10 again.

Any idea what goes wrong here?

Gert.

Nicolas,

Once more big thanks. Working now.

Gert.