当我的静态文件位于具有不同 URL 的 CDN 上时，如何使用 AngularDart? [英] How do I use AngularDart when my static files are on a CDN with a varying URL?

问题描述

我将 AngularDart 用于我的一个新应用程序.我有一个像这样设置的组件:

I'm using AngularDart for a new application of mine. I have a component set up like so:

@NgComponent(
    selector: 'game-timeline',
    templateUrl: '/static/dart/game/web/views/timelineview.html',
    cssUrl: '/static/dart/game/web/views/timelineview.css',
    publishAs: 'ctrl'
)

但我的问题是，在构建时不一定知道模板和 css 位置.它们将位于带有唯一部署标识符的 CDN 上.像……

But my problem is, the template and css locations aren't necessarily known at build-time. They'll be on a CDN with a unique deploy-identifier on them. Something like...

http://cdn.domain.com/static/30294832098/dart/game/web/views/timelineview.html

而且这个数字因每次部署而异.

And that number varies every deploy.

该路径似乎与其托管的 html 页面相关，但不在 CDN 上，因此我不能只使用相对路径 (../blah/blah)

The path seems to be relative to the html page it's hosted on, which is not on the CDN, so I can't just use a relative path (../blah/blah)

我可以在页面中注入一个 JS 变量，告诉我它的静态根在哪里，如果有帮助的话.

I can inject a JS variable into the page telling me where the static root it, if that helps.

主要的 .dart/.js 文件是从 CDN 加载的，但我似乎无法让它与它相关.

The main .dart/.js file is loaded from the CDN, but I can't seem to make it be relative to that.

有什么想法吗?

更新，这是我的完整解决方案，改编自 pavelgj 的精彩答案，该答案读取页面上名为 STATIC_URL 的 js 变量.

Update, here's my full solution adapted from pavelgj's great answer that reads in a js variable called STATIC_URL on the page.

import 'package:angular/angular.dart';
import 'package:js/js.dart' as js;

class CDNRewriter implements UrlRewriter {
  String staticUrl;

  CDNRewriter() {
    var context = js.context;
    staticUrl = js.context.STATIC_URL;
  }

  String call(String url) {
    if (url.startsWith('/static/')) {
      return _rewriteCdnUrl(url);
    }
    return url;
  } 

  String _rewriteCdnUrl(String url) {
    return url.replaceFirst(new RegExp(r'/static/'), staticUrl);
  }
}

推荐答案

您可以实现自定义 UrlRewriter.UrlRewriter 为通过 angular Http 服务，包括模板和 css.

You can implement a custom UrlRewriter. UrlRewriter is called for all resources fetched via angular Http service, including templates and css.

class MyUrlRewriter implements UrlRewriter {
  String call(String url) {
    if (url.startsWith('/static/')) {
      return _rewriteCdnUrl(url);
    }
    return url;
  } 
}

myModule.type(UrlRewriter, implementedBy: MyUrlRewriter);

这篇关于当我的静态文件位于具有不同 URL 的 CDN 上时，如何使用 AngularDart?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！