如果特定的stateParam为空，如何重定向到状态 [英] How to redirect to state if specific stateParam is empty

问题描述

我不确定我的操作方式是否正确，任何建议都将不胜感激.

I'm not sure if the way I am doing it is correct, any advice would be appreciated.

我有一个餐厅选择器，用户可以从中选择餐厅.然后，所有其他子州都加载特定于所选餐厅的内容.但是我需要默认选择一个子状态，包括一个餐厅，该餐厅将根据用户最近的位置或如果他们以前选择过一个cookie数据来选择.但是，我不确定如何在不知道餐厅ID的情况下默认情况下如何重定向到子状态?

I have a Restaurant Selector, which the user can select a restaurant from. Then all other child states load up content specific to the restaurant selected. But I need to have a child state selected by default, including a restaurant, which will be either selected based on the users closest location or on cookie data if they have previously selected one. But, i'm not sure how I can redirect to a child state by default without knowing the restaurant id already?

下面我的代码的混搭版本来说明.

A bastardised version of my code below to illustrate.

app.config(function ($stateProvider, $urlRouterProvider) {
$urlRouterProvider.otherwise("/restaurant/[some id based on cookie info]/our-food"); // if no id is set, then I want to get it from a cookie, but then how do i do the redirect?

$stateProvider
    .state('restaurant', {
        url: '/restaurant/:restaurantId',
        template: "<ui-view/>",
        controller: function($state, $stateParams, Data, RestaurantService, $cookieStore) {
            if(typeof $stateParams.restaurantId !== 'undefined') {
                                  // get the restaurantID from the cookie
                            }
        }
    })
    .state('restaurant.our-food', {
        url: '/our-food',
        templateUrl: function($stateParams) {
        return 'templates/food-food.html?restaurantId=' + $stateParams.restaurantId;
        },
    controller: 'SubNavCtrl'
    })
    .state('restaurant.glutenfree-vegetarian', {
        url: '/glutenfree-vegetarian',
        templateUrl: function($stateParams) {
    return 'templates/food-vegetarian.html?restaurantId=' + $stateParams.restaurantId;
        },
    controller: 'SubNavCtrl'
    })

下面的图片说明了前端发生的情况: www.merrywidowswine.com/ss.jpg

An image below to illustrate what is happening on the front end: www.merrywidowswine.com/ss.jpg

推荐答案

我将创建一个每次打开该特定状态时都会触发的事件.

I would create an event that is fired every time you open that specific state.

查看他们的文档: https://github.com/angular- ui/ui-router/wiki#onenter-and-onexit-callbacks

所以我的猜测是这样的

1. onEnter回调到餐厅状态(推荐)

$stateProvider.state("contacts", {
  template: '<ui-view>',
  resolve: ...,
  controller: function($scope, title){
  },
  onEnter: function(){
    if(paramNotSet){ $state.go(...)}
  }
});

我自己从来没有使用过这样的活动，因此您可能必须做一些有决心的体操运动，但是我相信这是最干净，最容易理解且最可维护的解决方案.

I've never used an event as such myself so you might have to do some gymnastics with resolve, but I believe this is the cleanest, easiest to understand and most maintainable solution.

2个全局onStateChangeStart事件 全球事件(尽管每次状态更改都会触发此事件)

2 Global onStateChangeStart event A global event (although this would get fired for every state change)

$rootScope.$on('$stateChangeStart', 
function(event, toState, toParams, fromState, fromParams){ ... //check cookie, change state etc ...})

3在控制器中 或者，如果您想像开始一样使用控制器.

3 In the controller Alternatively If you want to use the controller like you started doing.

controller: ['$state', '$stateParams', 'Data', 'RestaurantService', '$cookieStore', 
function($state, $stateParams, Data, RestaurantService, $cookieStore) {
    if(typeof $stateParams.restaurantId !== 'undefined') {
        sate.go('restaurant', $cookieStore['restaurant'])
    }
}]

就开发而言，这可能是最快的解决方案，但我相信使用事件会更清洁，并且使代码更容易理解.

This is probably the fastest solution in terms of development but I believe using events is cleaner and makes for more understandable code.

注意:我实际上没有运行任何此类代码，因此可能无法正常工作，它只是伪代码，可让您了解去向.如果您遇到问题，请告诉我.

Note: I haven't actually run any of this code so it might not work, it's just pseudo-code to give you an idea of where to go. Let me know if you run into issues.

编辑:完全不知道是否将stateParams传递给控制器​​.您可能必须使用resolve来访问它们.

EDIT: Acutally I'm not sure if stateParams are passed on to the controller. You might have to use resolve to access them.

编辑:要访问onEnter回调或控制器中的stateParams，我相信您必须这样使用resolve:

EDIT: to access stateParams in onEnter callback or the controller, I believe you have to use resolve as such:

    resolve: {
         checkParam: ['$state','$stateParams', '$cookieStore', function($state, $stateParams, $cookieStore) {
//logic in here, what it returns can be accessed in callback or controller.
         }]

有关更多示例/更好的解释，请参见ui-router文档上的解决方法

see the ui-router doc on resolve for more examples/better explanation

这篇关于如果特定的stateParam为空，如何重定向到状态的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！