Using AngularJS ui-router ui-sref results in the error message "Uncaught TypeError: Cannot read property '0' of undefined."

Question

Using AngularJS ui-router ui-sref results in the error message "Uncaught TypeError: Cannot read property '0' of undefined."

I am currently working on an angularJS component that utilizes ui-router with 2 straightforward route states.

export default function Routes($stateProvider, $urlRouterProvider, $locationProvider) {
    $stateProvider
        .state('details', {
          url: '/',
          template: '<div>...</div>'
        })
        .state('pdf', {
          url: '/viewpdf',
          template: '<pdf-viewer></pdf-viewer>'
        });

    $urlRouterProvider.otherwise(function ($injector, $location) {
        var $state = $injector.get("$state");
        $state.go("details");
    });
}

Within the details view, there is a controller responsible for retrieving a PDF document. Upon fetching the document successfully, the route state is updated within the callback using $state.go('pdf');

In the pdf view, there is a link with ui-sref functionality that redirects back to the details view:

<a ui-sref="details">Back to Details</a>

Sporadically, when clicking the Back to Details button, an error is triggered by page.js and does not change the route state.

Uncaught TypeError: Cannot read property '0' of undefined
    at new Context (page.js:208)
    at Function.page.replace (page.js:154)
    at onpopstate (page.js:347)
    at B (history.min.js:21)
    at history.min.js:22
Context @ page.js:208
page.replace @ page.js:154
onpopstate @ page.js:347
B @ history.min.js:21
(anonymous) @ history.min.js:22

Upon investigating the source of the error, it points to line 208 in page.js:

/**
   * Initialize a new "request" `Context`
   * with the given `path` and optional initial `state`.
   *
   * @param {String} path
   * @param {Object} state
   * @api public
   */

function Context(path, state) {
    /* ERROR STACK ENDS ON THIS LINE */
    if ('/' == path[0] && 0 != path.indexOf(base)) path = base + path;
    /* END */
    var i = path.indexOf('?');

    this.canonicalPath = path;
    this.path = path.replace(base, '') || '/';

    this.title = document.title;
    this.state = state || {};
    this.state.path = path;
    this.querystring = ~i ? path.slice(i + 1) : '';
    this.pathname = ~i ? path.slice(0, i) : path;
    this.params = [];

    // fragment
    this.hash = '';
    if (!~this.path.indexOf('#')) return;
    var parts = this.path.split('#');
    this.path = parts[0];
    this.hash = parts[1] || '';
    this.querystring = this.querystring.split('#')[0];
  }

Despite encountering the error, the URL and view remain at /viewpdf. Interestingly, if I wait a few seconds and click the back button again, it functions correctly.

What could be causing this issue, and how can it be resolved?

Edit: To clarify, the reference to the back button pertains to the Back to Details button within the /viewpdf view, not the browser's built-in back button. The browser's back button does not experience this bug.

javascript angularjs angular-ui-router page.js

Answer 1

Answer №1

Here is a solution that may help:

$state.go('state',{},{
    reload: true
});

For more information on the reload feature, visit:

To ensure that your state transition is successful, consider using the .then() method to handle any loading issues with the pdf state when switching back to the details state:

$state.go(..
    .then(
        onfulfilled,
        onrejected
    );

Find more details on the then() function at:

Update:

If you have other navigation buttons inside the component of the state, you can refer to this section of the documentation for assistance.

https://github.com/angular-ui/ui-router/wiki#user-content-view-load-events

$rootScope.$on('$viewContentLoaded',
  function(event, viewConfig){
      // Accessing all the view config properties.
      // Including the special property 'targetView'
      // viewConfig.targetView
  });

Within this listener, you could implement something like $scope.loaded = true combined with ng-disabled for navigation buttons.

This sample code sets up a directive for a navigation control and disables it until the DOM of the view has loaded:

angular.module('app',['ui.router'])
  .component('componentHome', {
    template: '<div>Home Page Contents...</div>',
    controller: ['$scope','$state','$rootScope',function($scope,$state,$rootScope){
      $scope.loaded = false;
      $rootScope.$on('$viewContentLoaded',
      function(event, viewConfig){
          $scope.loaded = true;
      });
    }]
  })
  .component('componentA', {
    template: '<div><go></go></div>',
    controller: ['$scope','$state','$rootScope',function($scope,$state,$rootScope){
      $scope.loaded = false;
      $rootScope.$on('$viewContentLoaded',
      function(event, viewConfig){
          $scope.loaded = true;
      });
      $scope.stateName = 'b';
      $scope.stateLabel = 'B';
    }]
  })
  .component('componentB', {
    template: '<div><go></go></div>',
    controller: ['$scope','$state','$rootScope',function($scope,$state,$rootScope){
      $scope.loaded = false;
      $rootScope.$on('$viewContentLoaded',
      function(event, viewConfig){
          $scope.loaded = true;
      });
      $scope.stateName = 'a';
      $scope.stateLabel = 'A';
    }]
  })
  .directive('go',['$state',function($state){
    return {
      restrict: 'E',
      template: '<button ng-disabled="!loaded" state="stateName">Go to Page {{ stateLabel }}</button>',
      link: function(scope,element){
        element.on('click',function(e){
          $state.go(scope.stateName,{},{
            reload: true
          }).then(
            function(){
              // fulfilled
            },
            function(){
              // rejected
            }
          );
        });
      }
    };
  }])
  .config(function($stateProvider){
    $stateProvider.state('/',{ url: '/', component: 'componentHome' });
    $stateProvider.state('a',{ url: '/a', component: 'componentA' });
    $stateProvider.state('b',{ url: '/b', component: 'componentB' });
  })
;

Using HTML:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <script src="jquery.js"></script>
    <script src="angular.js"></script>
    <script src="angular-ui-router.min.js"></script>
    <style>
      .active{ border: 1px dashed red; }
    </style>
  </head>
  <body ng-app="app">
      <a ui-sref="/"  ui-sref-active="active">Home Page</a>
      <a ui-sref="a" ui-sref-active="active">Page A</a>
      <a ui-sref="b" ui-sref-active="active">Page B</a>
      <div>
        <ui-view></ui-view>
      </div>
    <script src="app.js"></script>
  </body>
</html>

Answer 2

Here is a solution that may help:

$state.go('state',{},{
    reload: true
});

For more information on the reload feature, visit:

To ensure that your state transition is successful, consider using the .then() method to handle any loading issues with the pdf state when switching back to the details state:

$state.go(..
    .then(
        onfulfilled,
        onrejected
    );

Find more details on the then() function at:

Update:

If you have other navigation buttons inside the component of the state, you can refer to this section of the documentation for assistance.

https://github.com/angular-ui/ui-router/wiki#user-content-view-load-events

$rootScope.$on('$viewContentLoaded',
  function(event, viewConfig){
      // Accessing all the view config properties.
      // Including the special property 'targetView'
      // viewConfig.targetView
  });

Within this listener, you could implement something like $scope.loaded = true combined with ng-disabled for navigation buttons.

This sample code sets up a directive for a navigation control and disables it until the DOM of the view has loaded:

angular.module('app',['ui.router'])
  .component('componentHome', {
    template: '<div>Home Page Contents...</div>',
    controller: ['$scope','$state','$rootScope',function($scope,$state,$rootScope){
      $scope.loaded = false;
      $rootScope.$on('$viewContentLoaded',
      function(event, viewConfig){
          $scope.loaded = true;
      });
    }]
  })
  .component('componentA', {
    template: '<div><go></go></div>',
    controller: ['$scope','$state','$rootScope',function($scope,$state,$rootScope){
      $scope.loaded = false;
      $rootScope.$on('$viewContentLoaded',
      function(event, viewConfig){
          $scope.loaded = true;
      });
      $scope.stateName = 'b';
      $scope.stateLabel = 'B';
    }]
  })
  .component('componentB', {
    template: '<div><go></go></div>',
    controller: ['$scope','$state','$rootScope',function($scope,$state,$rootScope){
      $scope.loaded = false;
      $rootScope.$on('$viewContentLoaded',
      function(event, viewConfig){
          $scope.loaded = true;
      });
      $scope.stateName = 'a';
      $scope.stateLabel = 'A';
    }]
  })
  .directive('go',['$state',function($state){
    return {
      restrict: 'E',
      template: '<button ng-disabled="!loaded" state="stateName">Go to Page {{ stateLabel }}</button>',
      link: function(scope,element){
        element.on('click',function(e){
          $state.go(scope.stateName,{},{
            reload: true
          }).then(
            function(){
              // fulfilled
            },
            function(){
              // rejected
            }
          );
        });
      }
    };
  }])
  .config(function($stateProvider){
    $stateProvider.state('/',{ url: '/', component: 'componentHome' });
    $stateProvider.state('a',{ url: '/a', component: 'componentA' });
    $stateProvider.state('b',{ url: '/b', component: 'componentB' });
  })
;

Using HTML:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <script src="jquery.js"></script>
    <script src="angular.js"></script>
    <script src="angular-ui-router.min.js"></script>
    <style>
      .active{ border: 1px dashed red; }
    </style>
  </head>
  <body ng-app="app">
      <a ui-sref="/"  ui-sref-active="active">Home Page</a>
      <a ui-sref="a" ui-sref-active="active">Page A</a>
      <a ui-sref="b" ui-sref-active="active">Page B</a>
      <div>
        <ui-view></ui-view>
      </div>
    <script src="app.js"></script>
  </body>
</html>

Using AngularJS ui-router ui-sref results in the error message "Uncaught TypeError: Cannot read property '0' of undefined."

Answer №1

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