Chat Events

chat:message

Triggered whenever a new chat message is received. Note that if the message is of type "rollresult", you will need to call JSON.parse() on the content of the message to get an object which contains information on the roll results.

Note: If a player enters a chat message beginning with an exclamation mark (!), that message will have the type of "api" and not be shown to anyone. It's intended that this functionality can be used to provide commands that API scripts respond to. So, if the message is of type "api", then it hasn't been shown to anyone, and the player who sent the chat message is probably expecting an API script to do something as a result of the message.

Callback parameter:

Note: You probably don't need all of this information. In most cases you'll only be interested in the overall result of the roll (see the bottom of the first example). However all of it is provided if you want to really dig deeper into the results of a roll.

{
  "type":"V", //"V" = "Validated Roll" (this will always be "V" right now)
  "rolls": [
    {
      "type":"G", //"G" indicates a grouped roll. A group is like a series of "sub-rolls" within a roll.
      "rolls": [
        [
          {
            "type":"R", //"R" = "Roll"
            "dice":2, // Number of dice rolled (2dX means 2 dice)
            "sides":6, //Number of sides for the dice (Xd6 means 6 sides)
            "mods":{},
            "results": [ //An array of the results of each roll.
             {
               "v":1 // We rolled a 1 for our first 2d6
             },
             {
               "v":5 //We rolled a 5 for our second 2d6
             }
            ]
          }
        ]
      ],
      "mods":{},
      "resultType":"sum", //The result is a sum (as opposed to a success check)
      "results": [
        {
          "v":6 // In this case, the overall result (total) of the group.
        }
      ]
    },
    {
      "type":"M", //"M" = Math Expression
      "expr":"+5+"
    },
    {
      "type":"R", //"R" = Roll
      "dice":1,
      "table":"weather", //The table property is set to the name of the table used if this roll was made against a table
      "mods":{},
      "sides":2, //You can probably just ignore this for table rolls.
      "results": [
        {
          "v":0, //The "value" of the table item rolled. For text tables this is always 0.
          "tableidx":1, //The index of the item in the table that was rolled.
          "tableItem": { //A copy of the table item object as it existed when the table was rolled.
            "name":"rainy", 
            "avatar":"", //This will be a URL to an image if the rollable table uses image icons
            "weight":1,
            "id":"-IpzPx2j_9piP09ceyOv"
          }
        }
      ]
    },
    {
      "type":"C", // "C" = Comment
      "text":" Attack!"
    }
  ],
  "resultType":"sum", //The overall result type of the entire roll
  "total":11 // The overall total of the entire roll (including all sub-groups)
}

{
  "type":"V",
  "rolls": [
    {
      "type":"G",
      "rolls": [
        [
          {
            "type":"R",
            "dice":1,
            "sides":6,
            "mods": { //Modifications to the roll
              "compounding": { //"compounding" = "Compounding exploding (!!)"
                "comp":">=", //Comparison type
                "point":5 //Comparison point
              }
            },
            "results": [
              {
                "v":13 //Overall dice result. Note that since this is compounding exploding there is only one dice result.
              }
            ]
          }
        ]
      ],
      "mods": {
        "success": {
          "comp":">=",
          "point":6
        }
      },
      "resultType":"sum",
      "results": [
        {
          "v":13
        }
      ]
    }
  ],
  "resultType":"success", // In this case, the result is a count of successes
  "total":1 //Total number of successes
}

Chat Event Example (Implementing Custom Roll Type)

on("chat:message", function(msg) {
  //This allows players to enter !sr <number> to roll a number of d6 dice with a target of 4.
  if(msg.type == "api" && msg.content.indexOf("!sr ") !== -1) {
    var numdice = msg.content.replace("!sr ", "");
    sendChat(msg.who, "/roll " + numdice + "d6>4");
  }
});

Note that you can also use the "token_id" attribute with @selected and @target variables in your API commands to pass in the token ID of a selected or targeted token. For example:

!attack @{target|token_id}

Chat Functions

sendChat(speakingAs, input)

You can use this function to send a chat message.

speakingAs should be one of:

• Any string, in which case that will be used as the name of the person who sent the message. E.g. "Riley"
• A player's ID, formatted as "player|-Abc123" where "-Abc123" is the ID of the player. If you do this it will automatically use the avatar and name of the player.
• A character's ID, formatted as "character|-Abc123". If you do this it will automatically use the avatar and name of the Character.

input should be any valid expression just like the ones used in the Roll20 App. You enter text to send a basic message, or use slash-commands such as "/roll", "/em", "/w", etc. In addition:

• You can use Character Attributes with the format @{CharacterName|AttributeName}.
• You can use Character Abilities with the format: %{CharacterName|AbilityName}.
• You cannot use macros.
• You can use the "/direct <msg>" command to send a message without any processing (e.g. autolinking of URLs), and you can use the following HTML tags in the message:

  <code><span><div><label><a><br><br /><p><b><i><del><strike><u><img><blockquote><mark><cite><small><ul><ol><li><hr><dl><dt><dd><sup><sub><big><pre><code><figure><figcaption><strong><em><table><tr><td><th><tbody><thead><tfoot><h1><h2><h3><h4><h5><h6>

You can also add a third parameter consisting of a callback function which will be passed the results of the sendChat() call instead of sending the commands to the game. The results of the sendChat command will be an ARRAY of operations, and each individual object will be just like an object you receive during a chat:message event (see above).

You can use this, for example, to perform a roll using the Roll20 roll engine, then get the results of the roll immediately. You could then perform additional modifications to the roll before sending it to the players in the game.

sendChat("Riley", "/roll 1d20+4", function(ops) {
    // ops will be an ARRAY of command results.
    var rollresult = ops[0];
    //Now do something with rollresult, just like you would during a chat:message event...
});

API Command Buttons

Now available with the Update of Holding you can take advantage of the new text chat formatting (in both your API-generated messages and those generated by macros and abilities) to create "API command buttons" in the chat. Here's an example of what that looks like:

To do so using Markdown formatting:

[Attack Roll](!attackroll)

The text in between the brackets will show up in the button, and part in the parentheses is the command to be executed. You can include anything in a normal roll (macros, abilities, queries, etc.), but keep in mind that the command itself will be executed by the player who clicks on it. For example, don't include @{Character|AC} if everyone who can see the message can't access that character. Instead, include the actual value as it existed when you sent the command by filling it in yourself before you send the chat message. These buttons will work in all message types, general messages, whispers, gmwhispers, etc.

Note that if you use /direct to send a message, we won't do any Markdown parsing on it, so you need to include your own <a> tags. Here's an example of that:

<a href="!attackroll">Attack Roll</a>