EmberJS 路由器当 Promise 拒绝时

如果在过渡期间模型拒绝 Promise，则过渡将被中止，并且将不会显示新的目标路由模板，并且控制台中不会出现错误消息。

语法

Ember.Route.extend ({
   model() {
      //code here
   },

   actions: {
      error: function(reason) {
         // display or return the "Failure Message"
      }
   }
});

示例

下面给出的示例显示了如果模型拒绝 Promise 将如何中止过渡。创建一个新路由并将其命名为 promisereject 并在 router.js 文件中打开以定义 URL 映射 −

import Ember from 'ember';                   
//Access to Ember.js library as variable Ember
import config from './config/environment';
//It provides access to app's configuration data as variable config 

//The const declares read only variable
const Router = Ember.Router.extend ({
   location: config.locationType,
   rootURL: config.rootURL
});

//Defines URL mappings that takes parameter as an object to create the routes
Router.map(function() {
   this.route('promisereject');
});

//It specifies Router variable available to other parts of the app
export default Router;

使用以下代码打开在 app/templates/ 下创建的 application.hbs 文件 −

<h2>Router When Promises Reject</h2>
{{#link-to 'promisereject'}}Click Here{{/link-to}}

现在打开在 app/routes/ 下创建的 promisereject.js 文件，其中包含以下代码 −

import Ember from 'ember';

export default Ember.Route.extend ({
   model: function () {
      //RSVP.js is an implementation of Promises
      return Ember.RSVP.reject("Failure of promises");
   },

   actions: {
      //actions for displaying failure of promises using error hook and it takes 
         reason as parameter
      error: function (reason) {
         document.write("<h3>" + reason + "</h3>");
      }
   }
});