How can I show JSON formatting only for one content type and keep the default for all others?

Question

I'm working in a SharePoint library that contains both file and folder-type items.

I'm trying to replace the standard formatting for folders in a Name column with a clickable standard hyperlink. (The intention is to allow users can middle-click to open folders in a new window.)

I can cause the whole link to disappear if the content type matches my custom folder content type.

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "a",
  "txtContent": "@currentField",
  "attributes": {
    "href": "='AllItems.aspx?id=' + @currentField"
  },
  "style": {
    "visibility": "=if([$ContentTypeId]=='0x***mycontenttypeid***','visible', 'hidden')"
  }
}

However, this breaks navigation for file items on two counts:

• file links simply don't appear
• even if they did, the link in the href attribute would not work for a file item

What I'd like is to fallback to the default formatting for non-folder types. Is this possible? If not, will I have to construct a URL to display files, and how? (The defaultClick action only seems to work on button, not a elements.)

Answer 1

Use JSON code similar to this:

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "children": [
    {
      "elmType": "a",
      "txtContent": "@currentField",
      "attributes": {
        "href": "='AllItems.aspx?id=' + @currentField"
      },
      "style": {
        "display": "=if([$ContentType]=='Folder','block', 'none')"
      }
    },
    {
      "elmType": "div",
      "txtContent": "@currentField",
      "customRowAction": {
        "action": "defaultClick"
      },
      "style": {
        "display": "=if([$ContentType]=='Folder','none', 'block')"
      }
    }
  ]
}

You can apply conditions based on either [$ContentType] or [$ContentTypeId] as per your convenience.

Output:

Documentation: Use column formatting to customize SharePoint