[OlegUP]

базовый класс:

function Widget(block, options) {
    this.options = eval(options);
    this.block = $(block);
    var self = this;
//    this.options.widget = this.block.attr('widget');

    this.render = function(result_container) {
        if (result_container == undefined) result_container = this.block;
        $.ajax({
            url: "/widget/",
            type: "GET",
            data: {"options": JSON.stringify(this.options) },
            success: function (result) {
                $(result_container).empty().html(result); // empty добавил только что и тестю
                manager.run();
            }
        });
    };

    this.query = function(request_handler) {
    $.ajax({
        url: "/widget/",
        type: "GET",
        data: {"options": JSON.stringify(this.options) },
        success: function (result) {
            request_handler(result);
        }
        });
    };

    this.replaceRender = function() {
        $.ajax({
        url: "/widget/",
        type: "GET",
        data: {"options": JSON.stringify(this.options) },
        success: function (result) {
            self.block.replaceWith(result);
            manager.run()
        }
        });
    };
}