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Angularjs 发布时间：2022-04-20 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了Angular .controller()在.run()AngularJS之前运行，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

我在.run()中有一个ajax调用,它将一个变量加载到$rootScope中.在与视图关联的控制器中需要该变量.
有时在.controller加载时刷新(F5)时,$rootScope.SuperCategories中没有任何内容.

sampleApp.factory('SuperCategoryservice',['$http','$q','$rootScope',function ($http,$q,$rootScopE){

    var SuperCategoryservice =  {};
    SuperCategoryservice.SuperCategories = $rootScope.SuperCategories;
    alert ($rootScope.SuperCategories);
    return SuperCategoryservice;

}]);



sampleApp.run(function($rootScope,$http) {

    var req = {
        method: 'POST',url: 'SuperCategoryData.txt',//url: 'http://localhost/cgi-bin/superCategory.pl',headers: { 'Content-Type': 'application/x-www-form-urlencoded' }//,//data: { action: 'GET' }
    };


    $rootScope.SuperCategories = [];

    $rootScope.GetSuperCategories = function () {

        var defer = $q.defer();
        $http(screq).then(function(responsE) {
            $rootScope.SuperCategories = response.data;
            //alert ($rootScope.SuperCategories);
            defer.resolve($rootScope.SuperCategories);
        },function(error) {
            defer.reject("Some error");
        });
        return defer.promise;
    }

    $rootScope.GetSuperCategories();


});

如何解决这个bug.

解决方法

注意：这不是你问题的直接答案.
我只是试图以一种利用promises和工厂更常见的方式重写你的代码,可能会给你一些可以改进的想法,以使异步代码更可预测地工作.

控制器调用工厂来获取数据,当Promise得到解决时,你会在$rootScope.SuperCategories中获得数据

sampleApp.factory('SuperCategoryservice',$q){

    var req = {
        method: 'POST',//data: { action: 'GET' }
    };

    var SuperCategoryservice =  {};

    SuperCategoryservice.SuperCategories = function () {

        var defer = $q.defer();
        $http(screq).success(function(responsE) {
            defer.resolve(responsE);
        });
        return defer.promise;
    }


    return SuperCategoryservice;

}]);



sampleApp.controller('myController',['$scope','SuperCategoryservice',function($scope,SuperCategoryservicE) {

   SuperCategoryservice.SuperCategories().then(function(data){
             $rootScope.SuperCategories = data;
        });


});