[AgnularJS] Route Life Cycle

If you change a route, basic there are four steps before you can see the final reuslt.

1. on fire, for exmaple:

$location.path("/new");

In this step, there is your only change to do something you need to do before route changed.

 

2. route change start:

$rootScope.$on("$routeChangeStart", function(){...});

It knows where it should go and where it comes from. But data is not ready yet.

 

3. route change success:

$rootScope.$on("$routeChangeSuccess",function(){...});

The data is ready, route is changed ono the address panel and tempalte is loaded into the memory, but not yet shown on the screen.

 

4. show the template on the screen. Get into the new controller.

 

复制代码
var app = angular.module("app", ["ngRoute"]);

app.config(function ($routeProvider) {
    $routeProvider
        .when('/',
        {
            templateUrl: "app.html",
            controller: "ViewCtrl"
        }).when('/new', {
            templateUrl: 'new.html',
            controller: "NewCtrl",
            resolve:{
                loadData: viewCtrl.loadData
            }
        })
});

app.directive('error', function($rootScope){
    return{

        restrict: 'E',
        template: '<div class="alert-box alert" ng-show="isError">Error!!!</div>',
        link: function(scope){
            $rootScope.$on("$routeChangeError", function (event, current, previous, rejection) {
                scope.isError = true;
            })
        }
    }
})

app.controller("AppCtrl", function ($scope, $rootScope, $route, $location) {
    //event on route, depends on root scope
    $rootScope.$on("$routeChangeStart", function(event, current, previous, resolve){
        console.log("-------------2- change start----------------");
        //Before any promises been  resolved
        //know where it's going
        //where it comes from
        //but not yet data ready
        console.log($scope, $rootScope, $route, $location);
    });

    $rootScope.$on("$routeChangeSuccess",function(event, current, previous, resolve){
        console.log("-------------3- change success----------------");
        //Data is ready,
        //route is change
        //template has been loaded into memory
        //but visual not change yet
        console.log($scope, $rootScope, $route, $location);
    });
});

var viewCtrl = app.controller("ViewCtrl", function ($scope, $route, $location) {
    console.log($route);
   $scope.changeRoute = function(){
       console.log("-------------1-before change route----------------");
       console.log($scope);
       //Before the route change, here is the only change to do anything you need to do
       $location.path("/new");
   }
});

app.controller("NewCtrl", function($scope, loadData, $template) {
    console.log("-------------4-all done----------------");
    //change the visual
    console.log($scope, loadData, $template);
});

viewCtrl.loadData = function ($q, $timeout) {
    var defer = $q.defer();
    $timeout(function () {
       defer.resolve({message: "success"})
    }, 2000);
    return defer.promise;
}
复制代码

 

复制代码
<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="utf-8">
  <title>Egghead Videos</title>
  <link rel="stylesheet" href="./foundation.min.css">
  <script type="text/javascript" src="./angular.min.js"></script>
  <script type="text/javascript" src="./angular-route.min.js"></script>
  <script type="text/javascript" src="./app.js"></script>  
</head>
<body>

  <div ng-app="app" ng-controller="AppCtrl">
    <ng-view></ng-view>
      <error></error>
  </div>
</body>
</html>
复制代码

 

app.html

<h1><div ng-click="changeRoute()">Change route</div></h1>

 

new.html

<h1>Hi, I'm new here!</h1>

 

after cilick, change to   

posted @   Zhentiw  阅读(415)  评论(0)  编辑  收藏  举报
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