Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
537 views
in Technique[技术] by (71.8m points)

npm - Angular2 beta - bootstrapping HTTP_PROVIDERS - "Unexpected Token <"

Starting with the 5 minute quick start I've been playing around the angular2 beta and have run across a problem that has me stumped.

Here is a dumbed down version that shows the problem I have. First here a hello world app working perfectly.

package.json

{
   "name": "...",
   "version": "0.0.1",
   "description": "...",
   "author": {
   "name": "...",
   "email": "..."
    },
    "scripts": {
    "tsc": "tsc",
    "tsc:w": "tsc -w",
    "lite": "lite-server",
    "start": "concurrent "npm run tsc:w" "npm run lite" "
    },
    "license": "ISC",
    "dependencies": {
    "angular2": "2.0.0-beta.0",
    "bootstrap": "^3.3.6",
    "es6-promise": "^3.0.2",
    "es6-shim": "^0.33.3",
    "reflect-metadata": "^0.1.2",
    "rxjs": "5.0.0-beta.0",
    "systemjs": "0.19.6",
    "zone.js": "^0.5.10"
    },
    "devDependencies": {
    "concurrently": "^1.0.0",
    "lite-server": "^1.3.1",
    "typescript": "^1.7.3"
    }
}

index.html

<head>
<title>Title</title>
<link rel="stylesheet" href="node_modules/bootstrap/dist/css/bootstrap.min.css">
<link href="styles.css" rel="stylesheet" />

<!-- 1. Load libraries -->
<script src="node_modules/es6-shim/es6-shim.js"></script>
<script src="node_modules/angular2/bundles/angular2-polyfills.js">    </script>
<script src="node_modules/systemjs/dist/system.src.js"></script>
<script src="node_modules/rxjs/bundles/Rx.js"></script>
<script src="node_modules/angular2/bundles/angular2.dev.js"></script>


<!-- 2. Configure SystemJS -->
<script>
    System.config({
        packages: {
            app: {
                format: 'register',
                defaultExtension: 'js'
            }
        }
    });
    System.import('app/boot')
          .then(null, console.error.bind(console));
</script>

</head>

<!-- 3. Display the application -->
<body>
    <my-app></my-app>
</body>

app/boot.ts

import {bootstrap}    from 'angular2/platform/browser'
import {AppComponent} from './app.component'
import {AccountService} from './accounts/account.service'

bootstrap(AppComponent);

app/app.component.ts

import {Component, View} from 'angular2/core';
import {RegisterFormComponent} from './accounts/register-form.component'
@Component({
    selector: 'my-app',
})
@View({
    template: 'hello world',
})
export class AppComponent {
}

I evntually want to call my Web Api service so I am trying to follow the docs for Http, I update boot.ts as follows:

new app/boot.ts

import {bootstrap}    from 'angular2/platform/browser'
import {AppComponent} from './app.component'
import {AccountService} from './accounts/account.service'
import {HTTP_PROVIDERS} from 'angular2/http';

bootstrap(AppComponent, [HTTP_PROVIDERS]);

And here's where things choke.

Chrome gives me:

uncaught SyntaxError: Unexpected token < - http:1
uncaught SyntaxError: Unexpected token < - angular2-polyfills.js:138
    evaluating http://localhost:3000/angular2/http
    error loading http://localhost:3000/app/boot.js

It also fails if I try to set the HTTP_PROVIDERS as a viewProvider on my component.

Has anyone else had any luck getting Http to inject properly in the angular2 beta?

  • Visual Studio 2015
  • Node.JS & Node.JS tools for visual studio
  • Using 'NPM start' to compile and run
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

This error occurs when you try to import something that is not being included in your HTML when using SystemJS. Module bundlers like Webpack handle all that for you.

For your case you have to add the Http bundle that's a separated bundle, for example

<script src="https://code.angularjs.org/2.0.0-beta.0/http.dev.js"></script>

You'll see this same error when trying to use the router and you forgot to add the router bundle.

Check the difference between these two configurations from @pkozlowski-opensource's repos

  • Using SystemJS : For this case he would've to add http bundle, or router bundle if he wanted to use them.
  • Using Webpack : In this case Webpack bundles everything in that bundle.js file for you.

Glad it helped.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...