Angular 2 NgModel不起作用

时间:2016-01-03 15:47:24

标签: typescript browserify angular angular-ngmodel

我开始从Angular 1过渡到Angular 2.我尝试先做一些简单的事情,所以我写了一个组件:

import {Component} from 'angular2/core';
import {NgModel} from 'angular2/common';

@Component({
  selector: 'app',
  template: `
    <div>
    <div>Value is {{ value }}</div>
    <input type="text" [(ngModel)]="value" />
    </div>
  `,
  directives: [NgModel]
})
export class App {
  value: string;
};
<!DOCTYPE html>
<html>
  <head>
    <title>Angular2</title>
  </head>
  <body>
    <app></app>

    <script src="./js/bundle.js"></script>
  </body>
</html>

(bundle.js只进行app组件的引导)

我希望在文本框中输入内容后,我应该在div中获得相同的文字。但它并没有发生。

为什么我的代码不起作用?

此致 Sarun

更新我认为我可能错误地配置了我的构建系统,因此我添加了gulpfile.jspackage.jsonboot.ts

gulpfile.js

var gulp = require('gulp');
var browserify = require('browserify');
var tsify = require('tsify');
var source = require('vinyl-source-stream');
var uglify = require('gulp-uglify');
var buffer = require('vinyl-buffer');
var sourcemaps = require('gulp-sourcemaps');

gulp.task('ts', function() {
  browserify({
    debug: true
  })
  .add('source/ts/boot.ts')
  .plugin(tsify)
  .bundle()
  .pipe(source('bundle.js'))
  .pipe(buffer())
  .pipe(sourcemaps.init({
    loadMaps: true
  }))
  .pipe(uglify())
  .pipe(sourcemaps.write())
  .pipe(gulp.dest('build/js'));
});

gulp.task('watch', function() {
  gulp.watch('source/ts/**/*.ts', ['ts']);
});

的package.json

{
  "name": "hello-angular2",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "angular2": "^2.0.0-beta.0",
    "es6-promise": "^3.0.2",
    "es6-shim": "^0.34.0",
    "reflect-metadata": "^0.1.2",
    "rxjs": "^5.0.0-beta.0",
    "zone.js": "^0.5.10"
  },
  "devDependencies": {
    "browserify": "^12.0.1",
    "gulp": "^3.9.0",
    "gulp-exec": "^2.1.2",
    "gulp-live-server": "0.0.29",
    "gulp-sourcemaps": "^1.6.0",
    "gulp-uglify": "^1.5.1",
    "gulp-watch": "^4.3.5",
    "lite-server": "^1.3.2",
    "tsify": "^0.13.1",
    "typescript": "^1.7.5",
    "vinyl-buffer": "^1.0.0",
    "vinyl-source-stream": "^1.1.0"
  }
}

boot.ts

import 'reflect-metadata';
import {bootstrap} from 'angular2/platform/browser';
import {App} from './app';

bootstrap(App);

3 个答案:

答案 0 :(得分:3)

问题是您导入的_id是否有效(或需要)将其取出并且运行正常,请参阅此处:

https://plnkr.co/edit/tGqtYOXpPp0qdDpUNrtZ?p=preview

答案 1 :(得分:2)

经过长时间深入研究文档和漫长的谷歌搜索,我终于找到了答案。

(此答案将来可能有所变化,请参阅Angular文档)

https://github.com/angular/angular/blob/master/modules/angular2/docs/bundles/overview.md

正如@pixelbits所提到的,我错过了几个依赖项rxjsangular2-polyfills,后者是两个其他依赖项zone.jsreflect-metadata的填充,这必须是仅包含在<script>标记中。

我需要做的是:

  1. reflect-metadata移除boot.ts导入,并为其添加rxjs导入。
  2. <script>
  3. 添加angular2-polyfills.js的{​​{1}}代码

    瞧!它按预期工作。

    感谢@pixelbits,@ Zyzle和@GünterZöchbauer帮助我。

答案 2 :(得分:0)

您需要添加FORM_DIRECTIVESNgModel是不够的。 当我只添加No value accessor for '' in [AST](在Dart中)时,我收到错误NgModelexample in the code documentation也使用FORM_DIRECTIVES