Execute JavaScript from rules

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The Resco platform offers two main options for adding business logic to your projects:

  • Rules which represent the no-code approach for simpler use cases
  • Resco JavaScript Bridge that allows you to write custom scripts to modify UI, data, and access additional functions

The option to execute scripts directly from rules combines these two options. It aims to simplify writing JavaScript for Mobile CRM by removing the need for boilerplate code, and it should open a path for creating reusable JavaScript libraries with additional functionality for Resco mobile apps, e.g., additional math, date, or string operations, and also business logic.

Warning For now, this option is supported for form rules. Do not attempt to use the ExecuteJS function in other rules, for example, in views.

Offline HTML

In the Offline HTML section of Woodford, you need to add the following:

  • JSBridge.js (the file provided by Resco that contains the method to execute JS desired function from Woodford rule editor)
  • An HTML file with scripts. An example of such a script is available below.

Add function call to form rules

  1. Edit a form in Woodford.
  2. Click Add IFrame and link to the file script that you uploaded to the offline HTML folder in the previous section.
  3. Next, open the rules editor for an event, for example, On Save.
  4. Create a new variable and use the operation ExecuteJS.

Sample executejs rule.png

Additional information

  • The serialized MobileCRM.UI.EntityForm object is automatically passed as a parameter to the function. You cannot pass a custom input parameter.
  • The operator ExecuteJS is supported only for variables of the following types: Boolean, String, Integer, Double, Float, Decimal, Money, DateTime, StringList, Entity, Lookup.
  • The implementation supports also promises for asynchronous result return from functions.


<!DOCTYPE html>
    <meta charset="utf-8" />
    <title>JS from Resco rules</title>
    <meta http-equiv='X-UA-Compatible' content='IE=edge' />
    <meta name='viewport' content='initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no'>
    <script type='text/javascript' src='JSBridge.js'></script>
        function getAccountEntity() {
            return new Promise(function(resolve, reject) {
                var contact = new MobileCRM.FetchXml.Entity("account"); // NOTE: If we save to shared variable of type entity ACCOUNT, we need to create/fetch account entity.

                var fetch = new MobileCRM.FetchXml.Fetch(contact);
                fetch.execute("DynamicEntities", function (res) {
                    var current = res[getRandomInt(res.length)];
                    var entity = new MobileCRM.DynamicEntity(current.entityName, current.id, current.primaryName, clearInvalidProps(current.properties));
                }, reject, null);

        function getLookUp() {
            return new Promise(function(resolve, reject) {
                var account = new MobileCRM.FetchXml.Entity("contact");

                var fetch = new MobileCRM.FetchXml.Fetch(account);
                fetch.execute("DynamicEntities", function (res) {
                    var current = res[getRandomInt(res.length)];
                    resolve(new MobileCRM.Reference(current.entityName, current.id, current.primaryName));
                }, reject, null);

        function getInteger() { return getRandomInt(128); }
        function getString() { return getRandomString(); }
        function getDecimal() {
            var precision = 100; // 2 decimals
            return Math.floor(Math.random() * (10 * precision - 1 * precision) + 1 * precision) / (1 * precision);
        function getStringList() {
            var res = [];
            for (var i = 0; i < getRandomInt(); i++)

            return res;
        function getDateTime() {
            var dt = new Date();
            return dt.toLocaleTimeString();

        // **** Helpers ****

        function getRandomString(length) {
            var len = length || 7;
            return Math.random().toString(36).substring(len);
        function getRandomInt(maximum) {
            var max = maximum || 4;
            return Math.floor(Math.random() * Math.floor(max));