angularJS routing

AngularJS routing

AngularJS routing allows us to access different content through different URLs.

1. First, you need to introduce angular and angular-route on the page, pay attention to introduce angular before angular-route

<script src="https://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script>
<script src="https://apps.bdimg.com/libs/angular-route/1.3.13/angular-route.js"></script>

This is mainly because angular-route.js needs to pass in the parameter window.angular, and this parameter will only appear after angular is loaded.

2. The routing function is implemented by the routeProvider service and ng-view. ng-view is equivalent to providing a mount point for page templates. When switching URLs to jump, different page templates will be placed where ng-view is located. ; Then configure the route mapping through routeProvider.

Generally, there are two main methods:

when(): configuration path and parameters;

otherwise: Configure other path jumps, which can be thought of as default.

The second parameter of when:

controller: the controller function corresponding to the path, or the name

controllerAs: give the controller an alias

template: the page template corresponding to the path, which will appear at ng-view, such as "<div>xxxx</div>"

templateUrl: The path of the corresponding template, such as "src/xxx.html"

resolve: This parameter emphasizes that this property will bind a service or value to the routing-related controller in the form of a key-value pair object. Then inject the result value of the execution or the corresponding service reference into the controller. If the resolve is a promise object, it will wait for it to execute successfully before injecting it into the controller. At this time, the controller will wait for the execution result in resolve.

For a detailed example, please refer to the following example.

redirectTo: redirect address

reloadOnSearch: Set whether to load the corresponding template only when the address changes; neither search nor params changes will load the template

caseInsensitiveMatch: Paths are case sensitive

There are several commonly used events for routing:

$routeChangeStart: This event fires before the route jumps

$routeChangeSuccess: This event fires after the route jumps successfully

$routeChangeError: This event fires after a route jump fails

Example:

<div ng-controller="myCtrl">
        <ul>
            <li><a href="#/a">click a</a></li>
            <li><a href="#/b">click b</a></li>
        </ul>

        <view-div> </div>
</div>

Usually our URLs are of the form http://runoob.com/first/page, but in single page web applications AngularJS is implemented via the # + tag.

<script type="text/javascript">
    angular.module("myApp",["ngRoute"])
    .controller("aController",function($scope,$route){
        $scope.hello = "hello,a!";
    })
    .controller("bController",function($scope){
        $scope.hello = "hello,b!";
    })
    .controller("myCtrl",function($scope,$location){

        $scope.$on("$viewContentLoaded",function(){
            console.log("ng-view content loaded!");
        });

        $scope.$on("$routeChangeStart",function(event,next,current){
            //event.preventDefault(); //cancel url change
            console.log("route change start!");
        });
    })
    .config(function($routeProvider, $locationProvider) {
          $routeProvider
           .when('/a', {
            templateUrl: 'a.html',
            controller: 'aController'
          })
        .when('/b', {
            templateUrl: 'b.html',
            controller: 'bController',
            resolve: {
                  // I will cause a 3 second delay
                  delay: function($q, $timeout) {
                    var delay = $q.defer();
                    $timeout(delay.resolve, 3000);
                    return delay.promise;
                  }
            }
        })
        .otherwise({
            redirectTo: '/a'
          });
    });
</script>

解析：

1、载入了实现路由的 js 文件：angular-route.js。

2、包含了 ngRoute 模块作为主应用模块的依赖模块。

angular.module('routingDemoApp',['ngRoute'])

3、使用 ngView 指令。

该 div 内的 HTML 内容会根据路由的变化而变化。

配置 $routeProvider，AngularJS $routeProvider 用来定义路由规则。

AngularJS 模块的 config 函数用于配置路由规则。通过使用 configAPI，我们请求把$routeProvider注入到我们的配置函数并且使用$routeProvider.whenAPI来定义我们的路由规则。

$routeProvider 为我们提供了 when(path,object) & otherwise(object) 函数按顺序定义所有路由，函数包含两个参数:

第一个参数是 URL 或者 URL 正则规则。

第二个参数是路由配置对象。

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