如何在 Angular 2 中获取 JSON 文件 [英] How to fetch JSON file in Angular 2
本文介绍了如何在 Angular 2 中获取 JSON 文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
由于我是 Angular 的新手，任何人都可以提供一个使用 angular 2 加载 JSON 文件数据的简单解决方案.
我的代码如下
索引.html
<头><title>Angular 2 快速入门</title><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="css/styles.css"><!-- 1. 加载库--><!-- 旧浏览器的 Polyfill(s) --><script src="node_modules/core-js/client/shim.min.js"></script><script src="node_modules/zone.js/dist/zone.js"></script><script src="node_modules/reflect-metadata/Reflect.js"></script><script src="node_modules/systemjs/dist/system.src.js"></script><!-- 2.配置SystemJS--><script src="systemjs.config.js"></script><脚本>System.import('app').catch(function(err){ console.error(err); });<!-- 3. 显示应用程序--><身体><my-app>正在加载...</my-app></html>app.component.ts
import {Component} from '@angular/core';@成分({选择器:'我的应用'，模板:`<div id="main">主部门<div id = "标题"></div><div id = "内容"><ul class="游戏"><li>`})导出类 AppComponent {}
games.json
{游戏":[{"title":"主要操作",启用":真},{"title":"精选游戏",启用":假}]}我想在 app.component.ts 中将 games.json 中的所有游戏提取到 li 中请详细指教.
解决方案
这里是我解析JSON的部分代码，可能对你有帮助:
import { Component, Input } from '@angular/core';从@angular/core"导入{可注射}；从@angular/http"导入 { Http, Response, Headers, RequestOptions };从 'rxjs/Rx' 导入 {Observable}；导入 'rxjs/add/operator/map';导入 'rxjs/add/operator/catch';@Injectable()导出类 AppServices{构造函数(私有http:Http){变量对象；this.getJSON().subscribe(data => obj=data, error => console.log(error));}public getJSON(): Observable{返回 this.http.get("./file.json").map((res:any) => res.json()).catch((error:any) => console.log(error));}} as I am new to the Angular, can anyone please give a simple solution on loading the JSON file data using angular 2.
My code is like below
Index.html
<html>
<head>
<title>Angular 2 QuickStart</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="css/styles.css">
<!-- 1. Load libraries -->
<!-- Polyfill(s) for older browsers -->
<script src="node_modules/core-js/client/shim.min.js"></script>
<script src="node_modules/zone.js/dist/zone.js"></script>
<script src="node_modules/reflect-metadata/Reflect.js"></script>
<script src="node_modules/systemjs/dist/system.src.js"></script>
<!-- 2. Configure SystemJS -->
<script src="systemjs.config.js"></script>
<script>
System.import('app').catch(function(err){ console.error(err); });
</script>
</head>
<!-- 3. Display the application -->
<body>
<my-app>Loading...</my-app>
</body>
</html>
app.component.ts
import {Component} from '@angular/core';
@Component({
selector: 'my-app',
template: `
<div id="main">
Main Div
<div id = "header"></div>
<div id = "content">
<ul class="games">
<li>
</li>
</ul>
</div>
</div>
`
})
export class AppComponent {
}
games.json
{
"games":[
{
"title":"Primary Operations",
"enabled":true
},
{
"title":"Curated Games",
"enabled":false
}
]
}
I want to fetch all games from games.json into li at app.component.ts Please advise in detail.
解决方案
Here is a part of my code that parse JSON, it may be helpful for you:
import { Component, Input } from '@angular/core';
import { Injectable } from '@angular/core';
import { Http, Response, Headers, RequestOptions } from '@angular/http';
import {Observable} from 'rxjs/Rx';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
@Injectable()
export class AppServices{
constructor(private http: Http) {
var obj;
this.getJSON().subscribe(data => obj=data, error => console.log(error));
}
public getJSON(): Observable<any> {
return this.http.get("./file.json")
.map((res:any) => res.json())
.catch((error:any) => console.log(error));
}
}
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