angular.element($ window).scrollTop()使用webpack抛出"不是函数"

Question

我正在使用Angularjs进行前端开发.最近我开始实现Webpack然后我意识到angular.element($ window).scrollTop()停止工作并开始抛出错误,因为"windowElement.width不是函数".以下是旧代码和webpack的新代码.

旧工作代码:

app.directive("ajnav", ['$window', '$location', function ($window, $location) {
        return {
            restrict: "E",
            templateUrl: "/templates/common/AJNav.html",
            replace: true,
            scope: {
                seo: '=',
                conf: '='
            },
            link: function (scope, element, attrs) {
                //Bind event change the postion of AJ Nav on scroll
                var windowElement = angular.element($window);
                var onScrollHandler = function () {                    
                    //Get current height of iNav.
                    var iNavHeight = $("#iNavNGI_Header").height();
                    if (windowElement.scrollTop() > iNavHeight) {
                        $(element).addClass('navbar-fixed-top');
                        $(element).removeClass('aj-nav-container-absolute');
                    }
                    else {
                        $(element).removeClass('navbar-fixed-top');
                        $(element).addClass('aj-nav-container-absolute');
                    }
                };
                //Bind event handler on scroll
                windowElement.on('scroll', scope.$apply.bind(scope, onScrollHandler));                
            }

        };
    }]);

使用webpack的新代码抛出错误:

var $ = require("jquery");
var angular = require("angular");
var Utilities = require("./../../utilities/Utilities");
var AppUtilities = require("./../../utilities/AppUtilities"); 
module.exports = ['$window', '$location', function ($window, $location) {
        return {
            restrict: "E",
            templateUrl: "/templates/common/AJNav.html",
            replace: true,
            scope: {
                seo: '=',
                conf: '='
            },
            link: function (scope, element, attrs) {
                //Bind event change the postion of AJ Nav on scroll
                var windowElement = angular.element($window);
                var onScrollHandler = function () {
                    //Get current height of iNav.
                    var iNavHeight = $("#iNavNGI_Header").height();
                    if (windowElement.scrollTop() > iNavHeight) {
                        $(element).addClass('navbar-fixed-top');
                        $(element).removeClass('aj-nav-container-absolute');
                    }
                    else {
                        $(element).removeClass('navbar-fixed-top');
                        $(element).addClass('aj-nav-container-absolute');
                    }
                };
                //Bind event handler on scroll
                windowElement.on('scroll', scope.$apply.bind(scope, onScrollHandler));                
            }

        };
    }];

Follownig是我得到的异常的堆栈跟踪.

TypeError: windowElement.scrollTop is not a function
    at module.exports.link.onScrollHandler (site.min.js:42181)
    at Scope.$get.Scope.$eval (ite.min.js:25066)
    at Scope.$get.Scope.$apply (site.min.js:25165)
    at eventHandler (site.min.js:12594)

我在我的条目App.js中绑定了这个指令,如下所示

app.directive("ajnav", require("./directives/common/AJNav"));

我尝试了所有可能的选项,但无法修复它.请帮忙.

Answer 1

scrollTop函数是由jquery添加的,你必须在angular之后加载jquery.在这种情况下,您不会将$.fn函数添加到angular.element实例中.你也可以这样做$.fn.scrollTop.call($window).或者$($window).scrollTop()在角度之前加载jquery,以便当前代码按原样运行.

侧注:你不必这样做$(element),元素已经是jq(lite/query)包装,它已经有了add/removeClass可用的功能.