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In Magento 1.x you could have dynamic comments on system->configuration fields by declaring your field in system.xml like this:

<field_code_here translate="label">
    <label>Label Here</label>
    <frontend_type>text</frontend_type>
    <sort_order>10</sort_order>
    <show_in_default>1</show_in_default>
    <show_in_website>1</show_in_website>
    <show_in_store>1</show_in_store>
    <comment>
        <model>[module]/field_comment</model><!-- this made it dynamic -->
    </comment>
</field_code_here>

Then you just need to create the [Namespace]/[Module]/Model/Field/Comment.php file with this content:

class [Namespace]_[Module]_Model_Field_Comment 
{
    public function getCommentText()  //the method has to be named getCommentText
    {
        //do some calculations here
        return 'Some string based on the calculations';
    }
}

This way the field would have as comment what the getCommentText method from above returned.
Is there an alternative for Magento 2? It seams that I cannot attach a model to a comment tag. The system.xml is not validated by Magento/Backend/etc/system_file.xsd if I do.

  • Can you cite a use case? – benmarks Nov 24 '14 at 15:09
  • @benmarks For Magento 1, I got this from EE1.13. I hope I'm allowed to show it. It's from the system.xml for the Enterprise_SalesArchive module <comment><model>enterprise_salesarchive/system_config_backend_active</model></comment>. because of this comment model I would see in the system->configuration the number of archived orders. I've used this approach on numerous custom extensions and it worked on CE also. Obviously I cannot find a case in Magento 2. If I did I wouldn't be asking this question. I would just replicate that case. – Marius Nov 24 '14 at 15:15
  • @benmarks. IN case you are wondering why I need it, I'm planning to clone this magento 1 extension github.com/tzyganu/stock-filter to magento 2, for learning purposes. And in that extension I used this comment model approach to show a message under a config field, depending on the value of an other config field – Marius Nov 24 '14 at 15:18
  • Hmm. I want to say that the comment field is static by design, and I wonder if this is a UX best practice. If there's variability based on another field, that should be part of the overall message. That said, I can understand your case. Might be worth a discussion or PR on our GitHub. – benmarks Nov 24 '14 at 15:35
  • 4
    I'm voting to close this question as off-topic because this is related to a pre release version of Magento 2, more info here: meta.magento.stackexchange.com/questions/907/… – Raphael at Digital Pianism Apr 20 '16 at 8:26
1

[EDIT]
In the latest magento version this is possible in a similar way as in M2. I fixed it :)

[Original Answer]

It seams that this feature is partially implemented in Magento 2. It doesn't work yet.
In the code that generates the configuration form there is the method Magento\Backend\Model\Config\Structure\Element\Field::getComment:

public function getComment($currentValue = '')
{
    $comment = '';
    if (isset($this->_data['comment'])) {
        if (is_array($this->_data['comment'])) {
            if (isset($this->_data['comment']['model'])) {
                $model = $this->_commentFactory->create($this->_data['comment']['model']);
                $comment = $model->getCommentText($currentValue);
            }
        } else {
            $comment = parent::getComment();
        }
    }
    return $comment;
}

This method should handle the case when the comment is generated by a model, but the validation schema does not allow a model tag inside the comment tag because the comment is defined like this:

<xs:element name="comment" type="xs:string" />

I already opened a ticked on github

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