test.js

// connect to signalr hub
_connection = new signalR.HubConnectionBuilder().withUrl("/collabHub").build();
_connection.start();

_connection.on("ReceiveRegionSync", async function (syncRegion) {

    // set flag to avoid infinite loops
    _updating = true;

    TXTextControl.editableRegions.forEach(function (er) {

        // find editable region by id
        er.getID(function (id) {

            if (syncRegion.regionId == id) {
                er.getStart(function (start) {
                    er.getLength(function (length) {

                        TXTextControl.inputPosition.getTextPosition(function (sp) {

                            // select editable region
                            var sel = TXTextControl.selection;
                            var bounds = { "start": start - 1, "length": length };
                            sel.setBounds(bounds);

                            //sel = TXTextControl.selection;
                            // load synchronized content
                            sel.load(TXTextControl.StreamType.InternalUnicodeFormat,
                                syncRegion.document);

                            // reset input position
                            var bounds = { "start": sp, "length": 0 };
                            sel.setBounds(bounds);

                            // reset flags
                            setTimeout(function () {
                                _updating = false;
                                _dirtyFlag = false;
                            }, 100);
                        });

                    });
                });
            }
        });
    });
});