从json文件中提取数据并用按钮显示
我试图从json文件中提取数据并显示它,但我无法继续执行该程序,因为我缺乏编写代码的经验 目前使用Angular 4.3,它使用HttpClientModule 应用程序组件.ts从json文件中提取数据并用按钮显示,json,angular,Json,Angular,我试图从json文件中提取数据并显示它,但我无法继续执行该程序,因为我缺乏编写代码的经验 目前使用Angular 4.3,它使用HttpClientModule 应用程序组件.ts import { Component, OnInit } from '@angular/core'; import { HttpClient } from '@angular/common/http'; @Component({ selector: 'app-root', templateUrl:
import { Component, OnInit } from '@angular/core';
import { HttpClient } from '@angular/common/http';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
title = '?';
data;
constructor(private http: HttpClient) {
}
ngOnInit(): void {
this.http.get('/src/app/students.json')
}
chgTab1() {
this.title = "Changed Title";
}
chgTab2() {
//Want to display the items from json file
}
}
students.json
[
{"id": "3", "mame": "Dama"},
{"id": "1", "mame": "ASD"},
{"id": "2", "mame": "Chris"},
{"id": "4", "mame": "Sass"},
]
我编辑了整件事。现在对你有用了。确保您的student.json路径位于正确的位置。我将其移动到资产目录您的版本是否在4.0之前?由于某种原因,我无法从@angular/common/http获取导入头。我的错误。我已经更新了导入。您可以删除公共部分。还要导入RxJS还要确保在app.module.ts.Update中导入HttpModule:我无法获取json文件。获取404(未找到)无需担心。我刚刚启动了电脑,并为你做了测试。我已经更改了上面的答案,我可以确认它返回了数据。还有什么问题请告诉我。
import { Component, OnInit } from '@angular/core';
import { Http,Headers } from '@angular/http';
import 'rxjs/add/operator/map';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
title = '?';
data;
showData = false;
constructor(private http: Http) { }
ngOnInit(): void {
let headers = new Headers();
headers.append('Content-Type', 'application/json');
this.http.get('/assets/students.json', { headers: headers }).map(res => res.json()).subscribe(data => {
this.data = data;
})
}
chgTab1(){
this.title ="Changed Title";
}
chgTab2(){
//Want to display the items from json file
this.showData = !this.showData;
}
}