2

If I have a lineItem that needs some validation, for example on an option or note filed, how do I show potential errors in a template and repopulate the form with the posted values?

In addition, I’m working with a template that has multiple products on a page and uses MulitAdd to add items to the cart.

I’m validating lineItem data using onBeforeSaveLineItem and adding the error with something similar to $lineItem->addError('text','This is required');.

5
  • This is a quick guess before testing - but have you tried $lineItem->addError('options[text]','This is required'); Jun 29 '16 at 13:50
  • You can't attach errors to $lineItem because it doesn't exist - you stop it from being created if the validation fails. The above will work if the line item exists in the cart and will show the error message with {{ item.getError( 'options[text]' ) }} Jun 29 '16 at 14:03
  • Very good point, yes. I’m not adding the item though if there’s an error. $event->performAction = false; gets set instead.
    – James
    Jun 29 '16 at 14:11
  • Trying to find a solution where you attach errors to the cart - would be fine if there was only ever one item on a page, but you state there are multiple? If it were single you could just use $cart->addError('lineItemOptions[text]','This is required'); Seems messy though. Jun 29 '16 at 14:13
  • Thanks. Yep, multiple items in the add to cart form. I may need to fall back to a general message, which could work but no ideas yet on how to repopulate the form if it fails validation. As you say lineItems don’t exist, and creating a custom model seems messy.
    – James
    Jun 29 '16 at 14:18
3

To repopulate the form fields you can use the data from the post request using something like:

value="{{ craft.request.getPost( 'options.text' ) }}"

I also think I've got a rough solution for handling the errors.

//Add the cart to your event
$cart = craft()->commerce_cart->getCart();

//Check for field/fields
$text = craft()->request->getPost( 'options.text' );

//Check if it's got a value
if ( $text === '' )
{
  $event->performAction = false;

  //Build the handle we'll attach the error to
  //Use the purchasable id (variant) and then add the field we're checking for
  $lineItemErrorHandle = $item->purchasable->id . '-options[text]';

  //Add the error to the cart
  $cart->addError( $lineItemErrorHandle, 'The text is required' );
}

Then in your template you display it with the following where product.defaultVariant.id needs to be the id of the purchasable that attempted to be added to the cart.

{% set string = product.defaultVariant.id ~ '-options[text]' %}
{% if cart.getError( string ) %}
  We've got an error its {{ cart.getError( string ) }}
{% endif %}

I had to build the string outside of the .getError method because string interpolation wouldn't work using '#{product.defaultVariant.id}-options[text]'

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  • If the form has multiple items there could be multiple options.text fields though, some valid and some not, would this work?
    – James
    Jun 29 '16 at 14:58
  • What does the post request look like for multiple items? The purchasable id makes each error added to the cart unique to the item that through the error. I have only tested this with a single product page though. Jun 29 '16 at 14:59
  • We’re using MultiAdd so the post looks like items[num][options][text] – Perhaps we could loop through items[] and match the purchasable->id?
    – James
    Jun 29 '16 at 15:09
  • Looking at the MultiAdd docs it looks like you can use {{ craft.request.getPost( items[{{ loop.index }}][options][text] ) }} to populate the fields. In the plugin you would then loop through each item in the items post array and do the same as if it were a single item. Jun 29 '16 at 15:10
  • Also, having trouble accessing the post data as 'options.text' actually has a name containing spaces. For example, option[Item text]. How do you target that in a template?
    – James
    Jun 29 '16 at 15:45

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