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EmberJS 路由器通过willTransition防止转换

2018-01-04 11:49 更新

描述

如果URL更改，尝试转换将触发当前活动的路由，即willTransition操作。这调用最叶路由来决定是否应该发生转换。

语句

Ember.Route.extend({
   actions: {
      willTransition: function(transition) {
         //handle the transition
      }
   }
});

例子

<!DOCTYPE html>
<html>
   <head>
      <title>Emberjs Preventing Transitions Via willTransition</title>
      <!-- CDN's -->
      <script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/3.0.1/handlebars.min.js"></script>
      <script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.10.0/ember.min.js"></script>
      <script src="https://builds.emberjs.com/tags/v1.10.0-beta.3/ember-template-compiler.js"></script>
      <script src="https://builds.emberjs.com/release/ember.debug.js"></script>
      <script src="https://builds.emberjs.com/beta/ember-data.js"></script>
   </head>
   <body>
      <script type="text/x-handlebars">
         <h1>Transactions</h1>
         <!-- link to the trans template -->
         {{link-to 'Click For Transaction' 'trans'}}
      </script>

      <script type="text/x-handlebars" data-template-name="trans">
         {{outlet}}
      </script>

      <script type="text/javascript">
         App = Ember.Application.create();

         App.Router.map(function() {
            //trans route
            this.route('trans');
         });

         App.IndexRoute = Ember.Route.extend({
            actions:{
               willTransition: function(transition){
                  //decalring the self variable
                  var self = this;
                 //checking for self var: is false
                 if(!this.get('allowTransition')){
                    document.write('<b><font color="red">');
                    //display the message
                    document.write("transition abort");
                    document.write('</font><br>');
                    transition.abort();//calling abort function

                    Ember.run.later(function(){
                       //setting the self var true
                        self.set('allowTransition', true);
                        document.write('<b><font color="blue">');
                       //display message
                        document.write("transition retry");
                        document.write('</font>');
                        transition.retry();//calling retry function
                    }, 500);
                  }
                }
             }
         });
      </script>
   </body>
</html>

输出

让我们执行以下步骤，看看上面的代码如何工作：

将上面的代码保存在routing_prvntng_trans.html文件中
在浏览器中打开此HTML文件。

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