dart - Angular Dart中的分层路径参数

Question

我有一个简单的测试设置:一个带有参数A的路由parA和一个带有参数B的子路由parB。

    'A' : ngRoute 
    (
        path : '/A/:parA',
        enter: (RouteEnterEvent e)
        {
            print ('ENTERED A');
            e.parameters.keys.forEach(print);
        },
        mount: 
        {
            'B' : ngRoute
            (
                path: '/B/:parB',
                enter: (RouteEnterEvent e)
                {
                    print ('ENTERED B');
                    e.parameters.keys.forEach(print);
                }
            )
        }
    )

当我去/#/A/1234/B/5678时，我期望得到

Entered B 
parA
parB

相反，我得到了

Entered A
parA
Entered B
parB

这意味着在B中创建的组件的构造函数具有RouteProvider的组件无法访问参数parA。

Answer 1

似乎与此问题有关https://github.com/angular/route.dart/issues/85。
也许那里列出的解决方法也适用于您。

从问题复制:

As a current workaround I have a helper method that goes through all parent routes and adds them to the RouteEvent.

/// Adds the parameters of all parent routes to [e].
RouteEvent _addParentParams(RouteEvent e) {

  // Function to recursively get the parents.
  Function recursiveAddParentParams;
  recursiveAddParentParams = (Route route) {
    // Set the parent parameters to the event.
    e.parameters.addAll(route.parameters);

    if (route.parent != null) {
      recursiveAddParentParams(route.parent);
    }
  };

  recursiveAddParentParams(e.route.parent);

  return e;
}