Yes, it is possible to use custom code to make a CMS field automatically populate a paragraph or text form field in Webflow. The approach you mentioned using a "hand-coded" form in the dynamic embed code can work, but there are also a few other methods you can consider depending on your specific requirements.
1. Using Webflow API: One way to achieve this is by using the Webflow API. You can make a GET request to retrieve the data from the CMS field and then use JavaScript to populate the paragraph or text form field with the desired data. You can use JavaScript's DOM manipulation methods to target the specific HTML element and update its content dynamically.
Here's an example code snippet:
```javascript
fetch('https://api.webflow.com/collections/{collectionId}/items?api_version=1.0.0&access_token={yourAccessToken}')
.then(response => response.json())
.then(data => {
const fieldValue = data.items[0].fields.{fieldName};
document.getElementById('myParagraph').textContent = fieldValue;
})
.catch(error => console.error('Error:', error));
```
Replace `{collectionId}` with the ID of your CMS collection and `{yourAccessToken}` with your Webflow API access token. Also, replace `{fieldName}` with the name of the field you want to populate.
2. HTML embed with dynamic values: Another approach is to use HTML embed elements with dynamic values. You can create an HTML embed element within a Collection List or Collection Page and use dynamic expressions to populate the form field.
For example, you can use the following code as the HTML embed element's content:
```html
{{yourCMSField}}
\`\`\`Replace `yourCMSField` with the actual field name from your CMS collection. This will dynamically populate the paragraph with the value of this CMS field for each item in the collection list or on each collection page.
3. Custom code blocks (deprecated): As for the tip from 2016 you mentioned, it's referring to the Custom Code field that used to be available in Webflow for individual CMS items. However, this feature has been deprecated and is no longer available.
Regardless of the method you choose, make sure to follow best practices when using custom code in Webflow. Test thoroughly and consider potential performance implications or limitations.