Page Updated:   2021-09-25

This is about a Roll20 feature exclusive to Pro-subscribers (and often to players in a Game created by a Pro-subscriber). If you'd like to use this feature, consider upgrading your account.

• Oosh's explanation of CRP^(Forum)
• Custom Roll Parsing for Character Sheets

Parts

• An action button
• sheetworker to parse the roll sent with the action button
• Changes to Roll Templates to display the roll

Currently you can only display computed values in the first 10 fields that are sent in the macro.

The functions startRoll and finishRoll will allow sheet authors to access dice rolls and compute their own results for those rolls

Custom_Roll_Parsing.gif

Sheetworker Functions

Main Page: Sheetworkers

startRoll( roll, callback? ) (asynchronous)

This function accepts a roll as a string (generally a roll template string). The function will initiate a roll to the roll server, the results for which will be returned to the callback. The roll will wait for a corresponding finishRoll function call before posting the results to chat, however if the finishRoll call is not made within 5 seconds, the roll will be posted automatically. The results from the roll server will be an object containing the following properties

rollId: (string)

A unique identifier for this roll, required to finish the roll

results: (object)

An object containing the roll information from the roll server, where the keys are roll names and the values are an object containing the roll information, for example:

results: {
  roll1: {
      // The result of the roll, as calculated by the roll server
      result: 48,
      // An ordered array of the results of all dice in this roll
      dice: [9,9,20,4,4,1],
      // The original expression for this roll
      expression: ‘4d20+2d4’,
      // A breakdown of each “sub-roll” (each part of an expression is rolled separately)
      [
          {
              // The ‘4’ in ‘4d20’
              dice: 4,
              // The ‘20’ in ‘4d20’
              sides: 20,
              // Array of the results of each die
              results: [9,9,20,4]
          },
          …
      ]
  },
  …
}

finishRoll( rollId, computedResults? )

This function will finish a roll initiated with the startRoll function, and allow for adding computed results to each roll. The function requires the rollId from the startRoll function, and can accept an object, where the keys are roll names and the values are the computed results for that roll, as a string or an integer.

Roll Template Changes

Main Page: BCS/Roll Templates

To use the custom computed results in your roll templates, replace the roll names in the template with computed::<rollname>:

<rolltemplate class="sheet-rolltemplate-test">
    <div class="sheet-template-container">
        <h1>{{name}}</h1>
        <div class="sheet-results">
            <h4>Result = {{roll1}}</h4>
            <h4>Custom Result = {{computed::roll1}}</h4>
        </div>
    </div>
</rolltemplate>

When the roll is output to the chat, hovering the mouse over a custom result will display the quantum roll symbol, and the original results of each die.

In addition, the roll template functions rollTotal, rollGreater, rollLess, and rollBetween can use the computed result of a roll:

<rolltemplate class="sheet-rolltemplate-test2">
    <div class="sheet-template-container">
        <h1>{{name}}</h1>
        <div class="sheet-results">
            <h4>Result = {{roll1}}</h4>
            <h4>Custom Result = {{computed::roll1}}</h4>
            {{#rollTotal() computed::roll1 0}}
                <h5>Total 0!</h5>
            {{/rollTotal() computed::roll1 0}}
            {{#rollGreater() computed::roll1 1}}
                <h5>Greater Than 1!</h5>
            {{/rollGreater() computed::roll1 1}}
            {{#rollLess() computed::roll1 2}}
                <h5>Less Than 2</h5>
            {{/rollLess() computed::roll1 2}}
            {{#rollBetween() computed::roll1 1 3}}
                <h5>Between 1 and 3</h5>
            {{/rollBetween() computed::roll1 1 3}}
        </div>
    </div>
</rolltemplate>

Note that these roll template functions generally expect an integer value to compare, and attempting to use them to compare string values may not not work as expected.

Example

Bringing all of these new elements together, here is an example of implementing this feature:

<button type="action" name="act_test">Click me</button>

<rolltemplate class="sheet-rolltemplate-test">
    <div class="sheet-template-container">
        <h1>{{name}}</h1>
        <div class="sheet-results">
            <h4>Result = {{roll1}}</h4>
            <h4>Custom Result = {{computed::roll1}}</h4>
        </div>
    </div>
</rolltemplate>

<script type="text/worker">
    on('clicked:test', (info) => {
        startRoll("&{template:test} {{name=Test}} {{roll1=[[1d20]]}}", (results) => {
            const total = results.results.roll1.result
            const computed = total % 4;

            finishRoll(
                results.rollId,
                {
                    roll1: computed
                }
            );
        });
    });
</script>

Sheet Examples

Character sheets using the method:

Forum threads

• Adventures with startRoll()^(Forum) Aug, 2021 by Oosh
  • long discussion with many details
• Custom Roll Parsing - Separating groups of dice by type^(Forum)
• Now on Dev Server: Custom Roll Parsing for Character Sheets^(Forum) - old thread back when this was on Dev Server for testing

See Also

• Custom Roll Parsing for Character Sheets