Opening a book

From an item

Any object carrying the PeacefulEnd.Parchment/CustomFields/BookId custom field opens the named book when the player uses it. This is covered end to end in Your first book.

From a tile

PeacefulEnd.Parchment_OpenBook is a map tile action: the book opens when the player faces the tile and clicks it. Useful for a map-based book with no item required.

Set the Action property on a Buildings-layer tile to the action followed by the book's Id:

{
  "Action": "EditMap",
  "Target": "Maps/Town",
  "MapTiles": [
    {
      "Position": { "X": 43, "Y": 71 },
      "Layer": "Buildings",
      "SetProperties": {
        "Action": "PeacefulEnd.Parchment_OpenBook {{ModId}}_CampingGuide"
      }
    }
  ]
}

Property	Value	What it does
Action	PeacefulEnd.Parchment_OpenBook <bookId>	Opens <bookId> when the player checks the tile.

<bookId> is the book's Id as registered in Data/PeacefulEnd.Parchment/Books (the same string parchment_open uses).

To float a conditional icon above the tile so the player notices it, see Book indicators.

See the wiki for the map side of this (setting tile properties in Tiled or patching a vanilla map):

Modding: Maps

From the console

For testing, parchment_open <bookId> [page] [chapter] opens a book straight away with no item or tile. See Test it.

From another mod

A SMAPI mod can open a book in code through Parchment's C# API.