Roll20 makes a number of functions available that are not part of core JavaScript or some other library.

Global variables

_ (Underscore)

This is the namespace object for the Underscore.js library. Underscore has many functions for collection manipulation.

state

Properties of the state object will persist between game sessions. The same state object is also shared between all API scripts in a campaign, so it is strongly recommended that when writing values to state, you minimize your footprint as much as possible in order to avoid name collisions. Note: state gets serialized with JSON, so you cannot store functions or objects with cyclical references.

Global functions

Campaign

Parameters

No parameters

Returns

The singleton campaign Roll20 object.

Examples

var currentPageID = Campaign().get('playerpageid'),
    currentPage = getObj('page', currentPageID);

createObj

Parameters

type

(String) The type of Roll20 object to create. Only 'graphic', 'text', 'path', 'character', 'ability', 'attribute', 'handout', 'rollabletable', 'tableitem', and 'macro' may be created.

attributes

(Object) The initial values to use for the Roll20 object's properties.

Returns

The Roll20 object that was created.

Examples

When creating a Roll20 object that has a parent object (such as creating an attribute Roll20 object, which is a child of a character Roll20 object), you must supply the id of the parent in attributes.

on('add:character', function(obj) {
    createObj('attribute', {
        name: 'Strength',
        current: 0,
        max: 30,
        characterid: obj.id
    });
});

When creating a path Roll20 object, you must supply a value for the read-only property _path. This is an exception to the rule that prevents you from setting the value of read-only properties when creating Roll20 objects.

createObj('path', {
    left: 7000,
    top: 140,
    width: 140,
    height: 140,
    layer: 'objects',
    path: JSON.stringify([['M', 0, 0], ['L', 70, 0], ['L', 0, 70], ['L', 0, 0]])
});

When creating a handout Roll20 object, you cannot set the text or gmnotes at the time of creation.

var handout = createObj('handout', {
    name: 'A Letter Addressed to You',
    inplayerjournals: 'all',
    archived: false
});
handout.set({
    notes: 'Notes can only be set after the handout is created',
    gmnotes: 'GM Notes can only be set after the handout is created'
});

filterObjs

Parameters

callback

(Function) A predicate function to test all Roll20 objects against. The callback function receives a Roll20 object as a parameter, and should return either true (for Roll20 objects that will be included in the filterObjs return value) or false (for all other Roll20 objects).

Returns

An array of Roll20 objects which passed the predicate test.

Examples

var tokenName = getMyTokenName(),
    duplicateTokens = filterObjs(function(obj) {
        if (obj.get('type') !== 'graphic' || obj.get('subtype') !== 'token' || obj.get('name') === tokenName) return false;
        return obj.get('name').indexOf(tokenName) === 0 && /\d+$/.text(obj.get('name'));
    });

findObjs

Parameters

attributes

(Object) A collection of key:value pairs to match with Roll20 objects in the campaign.

options

(Object, optional) If options.caseInsensitive is true, string comparisons between Roll20 objects and attributes will be case-insensitive.

Returns

An array of Roll20 objects with properties that match attributes.

Examples

var npcs = findObjs({ type: 'character', controlledby: '' });

getAllObjs

getAttrByName

getObj

log

on

playerIsGM

playJukeboxPlaylist

randomInteger

sendChat

sendPing

spawnFx

spawnFxBetweenPoints

spawnFxWithDefinition

stopJukeboxPlaylist

toBack

toFront