Angular 2 NgModel不起作用 [英] Angular 2 NgModel doesn't work
问题描述
我正在开始从Angular 1过渡到Angular2.我尝试首先做一些简单的事情，所以我写了一个组件:
I'm starting my transition from Angular 1 to Angular 2. I tried to do simple things first so I wrote a component:
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仅执行app组件的引导程序)
(bundle.js do only the bootstrapping of app component)
我希望在文本框中输入内容后，我应该在div中得到相同的文本.但这不会发生.
I expect after I type something into the textbox, I should get the same text in the div. But it doesn't happen.
为什么我的代码不起作用?
Why doesn't my code work?
关于， 萨伦(Sarun)
Regards, Sarun
更新我认为我可能会错误地配置我的构建系统，所以我包括了gulpfile.js，package.json和boot.ts.
UPDATE I assume I may configure my build system incorrectly, so I include my gulpfile.js, package.json and boot.ts.
gulpfile.js
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']);
});
package.json
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);
推荐答案
在深入研究文档并进行了长时间的谷歌搜索之后，我终于找到了答案.
After a long dig in to the docs and a long googling, I finally found the answer.
(此答案将来可能会更改，请参阅Angular文档)
(This answer may change in the future, refer to Angular Documentation)
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rxjs和angular2-polyfills，后者是另外两个依赖项zone.js和reflect-metadata的polyfill，并且必须仅包含在<script>标记中
As @pixelbits mentioned, I missed a couple of dependencies rxjs and angular2-polyfills, the latter is a polyfill for two other dependencies zone.js and reflect-metadata and this must be included in a <script> tag only.
我需要做的是:
- 从
boot.ts中删除reflect-metadata导入，并将rxjs导入添加到其中. - 将
angular2-polyfills.js的<script>标记添加到index.html
- Remove
reflect-metadataimport fromboot.tsand addrxjsimport to it. - Add a
<script>tag forangular2-polyfills.jstoindex.html
瞧！它按预期工作.
感谢@ pixelbits，@ Zyzle和@GünterZöchbauer帮助我.
Thanks to @pixelbits, @Zyzle and @Günter Zöchbauer for helping me.
这篇关于Angular 2 NgModel不起作用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！
