angularjs ui-router: Get list of child states of a

问题:

Do you know a way in ui-router to get the list of child states of a given state?

I'm implementing a complex SPA with maybe 4 level deep navigation using ui-router.

I would like to implement a navigation tab interface for the second level generated automatically from the router table.

For that, I need to get the list of direct children of a given state (maybe is an abstract state). The only way that I've found to get the states is to do a $state.get() and obtain the full list of states, but that means that I'll have to parse child states on my own, and I think that's code already written in ui-router.

I let this question here in case there's anyone with experience in the source code or know of a plugin or module that can help me on this. Meanwhile I will do a research on my own and post results if I find something.

回答1:

I did this which is easier and faster:

var chillin = $state.get().filter(function(cState) { return cState.name.indexOf('parent.state.') === 0 });

回答2:

In the end, had to implement the functionality myself.

In the controller of the abstract route that has the tab interface, filtered the states using a regular expression taking advantage of the default naming convention for routes:

var routeName='Root.Parent'; // this is the "actual" route

// this regex is going to filter only direct childs of this route.
var secondRouteOnlyRegex = new RegExp(routeName + "\.[a-z]+$", "i");
var states = $state.get();

// this uses lodash to filter the states based on the regex
var navLinks = _.filter(states, (s) => {
    return secondRouteOnlyRegex.test(s.name) && !s.abstract;
});
$scope.tabs = navlinks;

My route definitions have a data property that contains the title and other metadata needed to render the tabs.

My template looks something like this (using bootstrap):

<ul class="nav nav-tabs">
    <li ng-repeat="state in tabs" ui-sref-active="active">
        <a href="{{state.url}}" ui-sref="{{state.name}}">{{state.data.title}}</a>
    </li>
</ul>

回答3:

If you use stateHelper, it enables you to register states like this (from the stateHelper readme):

angular.module('myApp', [ 'ui.router', 'ui.router.stateHelper' ])
    .config(function(stateHelperProvider){
        stateHelperProvider
            .state({
                name: 'root',
                templateUrl: 'root.html',
                children: [
                    {
                        name: 'contacts',
                        template: '<ui-view />',
                        children: [
                            {
                                name: 'list',
                                templateUrl: 'contacts.list.html'
                            }
                        ]
                    },
                    {
                        name: 'products',
                        templateUrl: 'products.html',
                        children: [
                            {
                                name: 'list',
                                templateUrl: 'products.list.html'
                            }
                        ]
                    }
                ]
            })
            .state({
                name: 'rootSibling',
                templateUrl: 'rootSibling.html'
            });
      });

In your navigation controller you can then use the children attribute on the "root" state. For instance, I'm using this to display all children of the current state:

angular.module('app')
    .controller('TransportController', function($scope, $state) {
        $scope.items = $state.current.children;     
    });

Hope this helps.