title: Error: a url property or function must be specified
body: <p>These are my initial days of working on BackBone.js. I am actually stuck with the router part as i am getting an error in the console "Error: a url property or function must be specified". This is my scenario; I have a click function which dynamically forms a REST URL, and fetch the data from server accordingly.</p>
  
  <p>Here is the click function code</p>
  
  <pre><code>function onUserClick(obj){
       var userID=$(obj).attr('id');
       window.location.href="#"+userID+"/";
       var userRouter = new UserRouter;
  }
  </code></pre>
  
  <p>And I have the following code in the router</p>
  
  <pre><code>var userModel;
  var UserRouter = Backbone.Router.extend({
      routes:{
          ":userid/":"getUsers"
      },
      getUsers:function(userid){
          var url="http://myserver.com/users/"+userid;
          userModel = new UserModel({urlRoot:url});
          var userView = new UserView({el:$(#"container")});
      }
  });
  var UserModel = Backbobe.Model.extend({});
  var UserView = Backbone.View.extend({
      model:userModel,
      initialize:function(){
          _.templateSettings = {
              interpolate: /\{\{\=(.+?)\}\}/g,
              evaluate: /\{\{(.+?)\}\}/g
          };
          this.model.fetch();
          this.model.bind("change",this.render,this);
      },
      render:function(){
          var data=this.model.toJSON();
          var userTemplate=_.template($("#userTemplate").text());
          var htmlData=userTemplate({
              "userData":data
          });
          $(this.el).html(htmlData);
      }
  });
  </code></pre>
  
  <p>Can someone help me to figure out the issue here? I know i have done something wrong here and seeks an expert advice on this. A woking sample for this scenario is much appreciated.</p>