IMP example of callback function in Jquery

Try this

Plugin

    (function($) {
        $.fn.myPlugin = function(options) {
            var settings = $.extend({
                // Default options
                onComplete: null, // Callback for completion
                onClick: null     // Callback for a click event
            }, options);

            // Plugin logic
            return this.each(function() {
                var $this = $(this);

                // Example: Trigger onComplete callback
                if (typeof settings.onComplete === 'function') {
                    settings.onComplete.call($this); // Call with 'this' context
                }

                // Example: Trigger onClick callback on a click event
                $this.on('click', function() {
                    if (typeof settings.onClick === 'function') {
                        settings.onClick.call($this, event); // Pass event object
                    }
                });
            });
        };
    })(jQuery);

Call

    // Usage example:
    $('#myElement').myPlugin({
        onComplete: function() {
            console.log('Plugin completed on:', this); // 'this' refers to #myElement
        },
        onClick: function(event) {
            console.log('Element clicked:', this, 'Event:', event);
        }
    });