devextreme/esm/__internal/integration/knockout/event_registrator.js

JavaScript/TypeScript Component Suite for Responsive Web Development

/**
 * DevExtreme (esm/__internal/integration/knockout/event_registrator.js)
 * Version: 25.2.7
 * Build date: Tue May 05 2026
 *
 * Copyright (c) 2012 - 2026 Developer Express Inc. ALL RIGHTS RESERVED
 * Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
 */
import eventRegistratorCallbacks from "../../../common/core/events/core/event_registrator_callbacks";
import $ from "../../../core/renderer";
import {
    isPlainObject
} from "../../core/utils/m_type";
import eventsEngine from "../../events/core/m_events_engine";
import {
    addNamespace
} from "../../events/utils/index";
import ko from "knockout";
if (ko) {
    eventRegistratorCallbacks.add(name => {
        const koBindingEventName = addNamespace(name, `${name}Binding`);
        ko.bindingHandlers[name] = {
            update(element, valueAccessor, allBindingsAccessor, viewModel) {
                const $element = $(element);
                const unwrappedValue = ko.utils.unwrapObservable(valueAccessor());
                const eventSource = unwrappedValue.execute ? unwrappedValue.execute : unwrappedValue;
                eventsEngine.off($element, koBindingEventName);
                eventsEngine.on($element, koBindingEventName, isPlainObject(unwrappedValue) ? unwrappedValue : {}, e => {
                    eventSource.call(viewModel, viewModel, e)
                })
            }
        }
    })
}