select2引起的滚动问题修复

在一个七八年前的项目中使用了 select2 js库，select2会引起父盒子滚动条无法滚动的情况。github上有相应的 issue，但是官方并为解决。这里贴一下解决方案。

$.fn.select2.amd.require(["select2/dropdown/attachBody", "select2/utils"], (AttachBody, Utils) => {
    AttachBody.prototype._attachPositioningHandler = function (decorated, container) {
        var self = this;
        var scrollEvent = "scroll.select2." + container.id;
        var resizeEvent = "resize.select2." + container.id;
        var orientationEvent = "orientationchange.select2." + container.id;
        var $watchers = this.$container.parents().filter(Utils.hasScroll);
        $watchers.each(function () {
            $(this).data("select2-scroll-position", {
                x: $(this).scrollLeft(),
                y: $(this).scrollTop()
            });
        });
        $watchers.on(scrollEvent, function (ev) {
            var position = $(this).data("select2-scroll-position");
            $(self).scrollTop(position.y); // patch: this => self
        });
        $(window).on(scrollEvent + " " + resizeEvent + " " + orientationEvent,
            function (e) {
                self._positionDropdown();
                self._resizeDropdown();
            }
        );
    };
});

相关 issue 地址：https://github.com/select2/select2/issues/3125

本文地址：https://www.tides.cn/p_js-select2-stop-parent-box-scroll