如何从链接到父/子视图/控制器的路线动态构建导航菜单 [英] How to dynamically build navigation menu from routes linking to parent/child views/controllers

问题描述

此问题是我的原始问题

This question is a follow-up question for my original question Linking directly to both parent+child views/controllers from the main navigation menu

可接受的答案很好，但是后来当我动态添加第二个"childRoute"时，我发现了一个问题.为了动态构建导航，我必须添加具有相同"route"属性的多条路线. (请参见下面的示例代码中的app.js).唯一的区别是标题"和设置"属性.

The accepted answer is great, but later when I added a 2nd "childRoute" dynamically, I noticed a problem. In order to build my navigation dynamically I had to add the multiple routes with the same "route" attribute. (see app.js in the example code below). The only difference were the "title" and "settings" attributes.

configureRouter(config, router){
    config.title = 'Aurelia';
    config.map([
        { route: 'shared-parent', moduleId: './shared-parent', settings: { childRoute: 'child-a' }, nav: true, title: 'Shared Parent - child-a' },
        { route: 'shared-parent', moduleId: './shared-parent', settings: { childRoute: 'child-b' }, nav: true, title: 'Shared Parent - child-b' },
        ...
    ]);

    this.router = router;
  }

我在视图中用于执行此操作的设置属性:

The settings attribute I used in the view for doing this:

<a if.bind="row.settings.childRoute" href.bind="row.href + '/' + row.settings.childRoute">${row.title}</a>

我知道它并不漂亮，但确实可以导航到正确的子路线.问题在于，总是两个具有重复"route"属性的路由中的最后一个被标记为活动.

I know it's not pretty but it does navigate to the right child route. The problem is that it's always the last of the 2 routes with duplicate "route" attributes that is marked as active.

之所以我添加settings: {childRoute: 'child-a/b' }而不是给它们提供诸如route: 'shared-parent/child-a'和route: 'shared-parent/child-b'之类的不同路由"属性的原因是，因为我们首先进行链接，所以该网址实际上会匹配shared-parent/child-a/child-a和shared-parent/child-b/child-b到共享的父母.

The reason why I added the settings: {childRoute: 'child-a/b' } instead of giving them distinct "route" attributes like route: 'shared-parent/child-a' and route: 'shared-parent/child-b' was that the url would actually then match shared-parent/child-a/child-a and shared-parent/child-b/child-b since we're first linking to the shared-parent.

此可实时运行的要点应该清楚地显示问题(子路径永远不会激活):

This live runnable gist should clearly display the problem (child-a route never activating): https://gist.run/?id=95469a9cb3a762d79da31e0b64248036

Ps. 如果您对这个问题的标题有更好的了解，请随时对其进行编辑.

Ps. If you have a better idea of what to call the title of this question please feel free to edit it.

推荐答案

因此，我在子视图模型的激活生命周期"钩子中使用EventAggregator来刺探您的问题.

So I took a stab at your problem using the EventAggregator in the Activate lifecycle hook in the child view models.

https://gist.run/?id=bfb5df5e39ac0bb73e9e1cae2d2496e2

在子视图模型中，我刚刚发布了一个事件，指出子路线已更新:

in the child view models, I just published an event stating the child route was updated:

activate(params, routeConfig, navigationInstruction) {
  let payload = navigationInstruction.parentInstruction.config.title;

  payload = payload.substring(0, payload.length - 7);

  this.aggregator.publish("child route updated", payload + "child-a");

}

在app.js文件中，我更新了路线标题，并添加了activeChild属性.接下来，在捕获事件时更新activeChild属性:

In the app.js file, I updated the route titles, and added an activeChild property. Next, update the activeChild property when the event is captured:

constructor(aggregator) { 

  this.aggregator = aggregator; 



  this.aggregator.subscribe("child route updated", payload => { 

    this.activeChildRoute = payload;

    console.log(this.activeChildRoute);

  });

}

最后，我更新了您列表项上的类表达式，以根据该活动子标志进行更新:

Finally, I updated the class expression on you list item to update based on that active child Flag:

    <li repeat.for="row of router.navigation" 
        class="${row.title === activeChildRoute ? 'active' : ''}">

这篇关于如何从链接到父/子视图/控制器的路线动态构建导航菜单的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！