Note that you will need the Pro version of Add-Ons Ultimate and the Advanced Uploads extension to retrieve an uploaded PDF’s page count.

The first step is to enable the feature by going to WooCommerce > Settings > Product Add-Ons > Uploads. Enable these settings and click ‘Save changes’.

• Enable PDF uploads
• Enable PDF page count

Then, create the following fields.

An Upload field which now accepts a PDF file. You will need to disable ‘Allow multiple uploads’ as the calculation will only read 1 file.

Create a Calculation field that will reference the Upload field. When a PDF file is uploaded, the calculation will retrieve the number of pages.

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Here’s how to add your snippet: How to add a code snippet to your site

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The above code will make the section display 4 columns. You can adjust the number of columns, by changing the width value.

You only need to divide 100% by the number of columns you’d like. For example, 2 columns = 100/2 =50%.

The width should be set to 50%.

Here’s how to add your CSS: How to add CSS to your WordPress site

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The user can click on a button-style text swatch to select it.

To create a text swatch field:

• Decide whether you want to allow the user to choose a single option or multiple options per field
• If the user can only choose a single option, follow the guidance to create a ‘Radio Group‘ field
• If the user can select multiple options, follow the guidance to create a ‘Checkbox Group‘ field (Pro only)
• In the field settings, just enable the ‘Display as Swatch’ option

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You’ll need to use the following snippet, updating the return values for each filter with the name of the data you want to send. The name can be formed by adding an underscore before the field label name -so if your field label is ‘Upload’, the name will be ‘_Upload’.

Here’s how to add a snippet.

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There’s an example product here showing this in action.

To allow the user to enter measurements in fractions:

• First create a standard number field for your first dimension, e.g. ‘Width’, for the user to enter the whole number

• Then create a select field with the different fractions as the options – e.g. 1/8, 1/4, etc.
• Enter the decimal equivalent of the fraction, e.g. 0.125, 0.25, etc, in the ‘Price’ column next to the fractions
• Finally, set ‘Field Price Visibility’ and ‘Option Price Visibility’ to ‘Hidden’

You can repeat for any further dimensions – e.g. height.

Using fractions in calculations

You can now use the decimal values for the fields in your calculations. Create a calculation field to work out the value of your ‘width’ fields as a decimal:

Note that the formula looks like this:

{field_1752} + {field_1753_option_price}

You will need to change the field IDs to match yours. We use the {field_1753_option_price} tag to get the decimal value for the fractions.

You can also set this field to ‘Hide Calculation’ so that it’s not displayed on the front end. Also, ensure that you set the ‘Decimal Places’ to the create number.

Repeat this for your ‘height’ field.

Calculating the area

Now you can create a field to set the area. This will just multiply the value of your two calculation fields above.

The formula will be:

{field_2796} * {field_2797}

You will need to change the field IDs to match your own IDs.

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Add the following shortcode under the line item in your template:

[document_item_product data="aou_addons"]

Next, you’ll need to add this snippet: https://gist.github.com/plugin-republic/b6c4fae7799531f6897bd37d4fde0cbd.

Here’s how to add a snippet.

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Click the ‘Inventory’ tab in the ‘Product data’ section:

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By default, fields are validated when the user clicks the Add to Cart button. WooCommerce’s standard behaviour is to validate the add to cart form and reload the product page. Any validation notices are displayed when the page is reloaded.

The position and style of the notice is set by your theme.

Optimised validation

If you prefer the validation to take place without the product reloading, you can choose the ‘Optimised validation’ option. Go to WooCommerce > Settings > Product Add-Ons to enable the setting.

Optimised validation will display inline messages for any fields that have failed validation when the user clicks the Add to Cart button.

This helps guide the user to any fields which have failed validation. It’s particularly helpful on product pages with several add-on fields.

Filter optimised validation messages

If you’d like to change the text in the optimised validation messages, you can use these snippets:

What happens if validation isn’t working?

If the user is able to add a product to the cart and bypass validation, either:

• Enable ‘Optimised validation’ above. This will prevent the user from adding the product to the cart
• Or, check this article

Number field validation

If you have set a minimum or maximum value for your number field, it will try to validate this whether or not the field is required.

This means that if you have entered a minimum of 5 and the user leaves the field empty, there will still be a validation error if the user tries to add the product to the cart – even though the field is not required.

To ensure that number fields can be left empty even if they have a minimum or maximum value, and prevent validation on a non-required number field, add this to your functions.php file or snippets file:

Filter validation message

You can filter the default validation error message when the user adds an item to the cart like this:

Custom validation for add-on fields

You can add your own validation when a user adds a product to their cart.

Validation minimum number of files

In the example below, we’re checking that the value of field with ID pewc_group_3990_4033 is not less than 10. Substitute with your own values.

Here’s an example for setting a minimum number of files to upload:

Setting minimum quantity of child products

Here’s an example for requiring a minimum quantity of child products:

Setting maximum quantity of child products

Here’s an example of how to filter the validation message when the maximum number of child products has been exceeded.

You can update the $message variable to whatever you like. Use the $field_label and $max_products variables in your message if required.

Find out here how to add this snippet to your site.

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