记录一个使用jquery实时监听元素高度变化的插件

//转的别人的博文，但忘了原文链接了
//一个jquery的插件，用于监听元素宽度高度变化，调用方式：

//一个jquery的插件，用于监听元素宽度高度变化，调用方式：
//$("classname").bind('resize',function(){
//callback
//...
//...
//});
(function ($, window, undefined) {
    var elems = $([]),
        jq_resize = $.resize = $.extend($.resize, {}),
        timeout_id,
        str_setTimeout = 'setTimeout',
        str_resize = 'resize',
        str_data = str_resize + '-special-event',
        str_delay = 'delay',
        str_throttle = 'throttleWindow';
    jq_resize[str_delay] = 250;
    jq_resize[str_throttle] = true;
    $.event.special[str_resize] = {
        setup: function () {
            if (!jq_resize[str_throttle] && this[str_setTimeout]) {
                return false;
            }
            var elem = $(this);
            elems = elems.add(elem);
            $.data(this, str_data, {
                w: elem.width(),
                h: elem.height()
            });
            if (elems.length === 1) {
                loopy();
            }
        },
        teardown: function () {
            if (!jq_resize[str_throttle] && this[str_setTimeout]) {
                return false;
            }
            var elem = $(this);
            elems = elems.not(elem);
            elem.removeData(str_data);
            if (!elems.length) {
                clearTimeout(timeout_id);
            }
        },
        add: function (handleObj) {
            if (!jq_resize[str_throttle] && this[str_setTimeout]) {
                return false;
            }
            var old_handler;

            function new_handler(e, w, h) {
                var elem = $(this),
                    data = $.data(this, str_data);
                data.w = w !== undefined ? w : elem.width();
                data.h = h !== undefined ? h : elem.height();
                old_handler.apply(this, arguments);
            }

            if ($.isFunction(handleObj)) {
                old_handler = handleObj;
                return new_handler;
            } else {
                old_handler = handleObj.handler;
                handleObj.handler = new_handler;
            }
        }
    };

    function loopy() {
        timeout_id = window[str_setTimeout](function () {
            elems.each(function () {
                var elem = $(this),
                    width = elem.width(),
                    height = elem.height(),
                    data = $.data(this, str_data);
                if (width !== data.w || height !== data.h) {
                    elem.trigger(str_resize, [data.w = width, data.h = height]);
                }
            });
            loopy();
        }, jq_resize[str_delay]);
    }
})(jQuery, this);

使用：

//bind resize事件
//$(".widget-main")需要监听的元素
$(".widget-main").bind('resize', function () {
       if ($(".widget-main").height() >= 500) {
             $(".widget-body").css({
                   "overflowY": "scroll"
              })
       } else {
              $(".widget-body").css({
                     "overflowY": "auto"
                })
        }
 });