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I read this article about using rules and a trigger to populate/create a barcode field from a serial field, tried toy follow it but the screens/ facilities of Drupal 6 seem different for v 7 and the documented steps cannot be replicated. In particular I expected barcodes to be part of the drop down for fields but it isn't

"basically you should add a new rule that fills for you the barcode when new content is created starting from the serial field. The steps are:

create a new rule trigger it on the event: 'after new content is saved' set some condition on the type of the content (optional) use 'populate a field' (under CCK category) as action choose your barcode CCK field Use the token of your serial field : [node:field_YOUR_TOC_SERIAL_FIELD-id] -- I don't remember why I didn't use the token but the follow php code:

array('barcode' => [node:field_MY_FIELD_NAME-id])); ?> If you didn't use Rules before have a look here: http://dev.nodeone.se/node/646 "

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Its complicated but I essentially ended up using the available barcode online generators (Google has an online QR Code generator) and then embedding the URL in HTML mail that I was sending out.

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Have you seen the Barcode Module?

The Barcode module provides a text field to generate barcode images.

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  • Yes that was the module I tried to use - see the description of the problem above - You see - it works if you have the complete value known known before hand. In my case I generate a serial number and a check digit so by the time the value generated by Computed Field, the barcode is already generated with either the default value if there is one or nulls.
    – Paulo
    Aug 14, 2014 at 13:45

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