防止击中子状态ui-router

Here is what i have so far with ui-router states:

以下是我到目前为止ui-router状态:

$stateProvider
  .state('tools', {
    url: '/tools/:tool',
    template: '<div ui-view=""></div>',
    abstract: true,
    onEnter: function ($stateParams, $state, TOOL_TYPES) {
      if (TOOL_TYPES.indexOf($stateParams.tool) === -1) {
        $state.go('error');
      }
    }
  })
  .state('tools.list', {
    url: '',
    templateUrl: 'app/tools/tools.tpl.html',
    controller: 'ToolsController'
  })
  .state('tools.view', {
    url: '/:id/view',
    templateUrl: 'app/tools/partials/tool.tpl.html',
    controller: 'ToolController'
  });

As you can see parent state has parameter tool which can be only in TOOL_TYPES array. So in case when tool is not available, i want to redirect to the error page.

正如您所见,父状态具有参数工具,该工具只能在TOOL_TYPES数组中。因此,如果工具不可用,我想重定向到错误页面。

Actually, everything works as expected, but i get two errors:

实际上,一切都按预期工作,但我得到两个错误:

TypeError: Cannot read property '@' of null

TypeError:无法读取null的属性'@'

TypeError: Cannot read property '@tools' of null

TypeError:无法读取null的属性“@tools”

So i guess, child states have been 'hit' anyway. Is it possible to prevent this? Or maybe there is some other way to achieve what i want?

所以我想,无论如何,儿童状态已被“击中”。有可能阻止这种情况吗?或者也许还有其他方法来实现我想要的东西?

1 个解决方案

#1

Angular ui-router's documentation mentions that onEnter callbacks gets called when a state becomes active, hence, the child states were activated.

Angular ui-router的文档提到当状态变为活动状态时调用onEnter回调,因此激活了子状态。

To solve this problem you need to implement two things:

要解决此问题,您需要实现两件事:

Create a resolve that returns a rejected promise once a specific condition does not apply to that state. Make sure that the rejected promise is passed with information regarding the state to redirect to.

创建一个在特定条件不适用于该状态时返回被拒绝的承诺的决心。确保传递被拒绝的承诺,并提供有关要重定向到的状态的信息。
Create a $stateChangeError event handler in the $rootScope and use the 6th parameter which is the representation of the information you have passed in the rejected promise. Use the information to create your redirect implementation.

在$ rootScope中创建$ stateChangeError事件处理程序,并使用第6个参数,该参数表示您在被拒绝的承诺中传递的信息。使用该信息创建重定向实现。

DEMO

Javascript

angular.module('app', ['ui.router'])

  .value('TOOL_TYPES', [
    'tool1', 'tool2', 'tool3'
  ])

  .config(function($stateProvider, $urlRouterProvider) {

    $stateProvider

      .state('error', {
        url: '/error',
        template: 'Error!'
      })

      .state('tools', {
        url: '/tools/:tool',
        abstract: true,
        template: '<ui-view></ui-view>',
        resolve: {
          tool_type: function($state, $q, $stateParams, TOOL_TYPES) {

            var index = TOOL_TYPES.indexOf($stateParams.tool);

            if(index === -1) {
              return $q.reject({
                state: 'error'
              });
            }

            return TOOL_TYPES[index];
          }
        }
      })

      .state('tools.list', {
        url: '',
        template: 'List of Tools',
        controller: 'ToolsController'
      })
      .state('tools.view', {
        url: '/:id/view',
        template: 'Tool View',
        controller: 'ToolController'
      });

  })

  .run(function($rootScope, $state) {
    $rootScope.$on('$stateChangeError', function(
      event, toState, toStateParams, 
      fromState, fromStateParams, error) {

        if(error && error.state) {
          $state.go(error.state, error.params, error.options);
        }

    });
  })

  .controller('ToolsController', function() {})
  .controller('ToolController', function() {});

#1