请，我需要帮助来显示单个JSON对象属性。
这是我的服务：
<!DOCTYPE html>
<html>
<head>
<title>Contact</title>
<link href="https://fonts.googleapis.com/css?family=Quicksand" rel="stylesheet">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="contact.css">
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.css">
</head>
<body>
<!--navbar-->
<nav class="navbar navbar-expand-sm navbar-dark bg-dark">
<a class="navbar-brand" href="home.html"><img class="avatar" src="images/Originals/avatar.jpg" alt>Munoz Designs</a>
<!--Toggle Button-->
<button class="navbar-toggler" type="button" data-toggle="collapse"data-target="#navbarResponsive"aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span></button>
<!--Navbar links-->
<div class="collapse navbar-collapse" id="navbarResponsive">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<li class="nav-item">
<a class="nav-link"
href="about.html">About</a>
</li>
<li class="nav-item">
<a class="nav-link"
href="gallery.html">Gallery</a>
</li>
<!--Social Media Icons-->
<li class="nav-item">
<a class="nav-link" href="https://www.instagram.com/eddiearkmunoz/" title="Follow on Instagram" target="_blank"><i class="fa fa-instagram" aria-hidden="true"></i></a>
<li class="nav-item">
<a class="nav-link" href="https://www.linkedin.com/in/eddie-munoz-351a9428/" title="Follow on Linkedin" target="_blank"><i class="fa fa-linkedin-square" aria-hidden="true"></i></a>
<li class="nav-item">
<a class="nav-link" href="https://twitter.com/arkadiusart" title="Follow on Twitter" target="_blank"><i class="fa fa-twitter" aria-hidden="true"></i></a>
<li class="nav-item">
<a class="nav-link" href="https://eddiemunoz.deviantart.com/gallery/" title="Follow on Deviant Art" target="_blank"><i class="fa fa-deviantart" aria-hidden="true"></i></a>
<li class="nav-item">
<a class="nav-link" href="https://www.artstation.com/ed209" title="Follow on ArtStation" target="_blank"><i class="fa fa-paint-brush" aria-hidden="true"></i></a>
<li class="nav-item">
<a class="nav-link" title="Email">
<i class="fa fa-envelope-o" aria-hidden="true"></i></a>
</ul>
</div>
</div>
</nav>
<div class="intro">
<h1>Contact</h1>
<h4>If you would like to work with me, send me a message!</h4>
</div>
<!--Contact-->
<div class="container">
<div class="row">
<div class="col-md-12">
<div class="well well-sm">
<form class="form-horizontal" method="post">
<fieldset>
<div class="form-group">
<div class="col-md-8">
<div class="input-wrapper">
<input id="fname" name="name" placeholder="Name" type="text" class="form-control">
<label for="fname" class="fa fa-user input-icon bigicon"></label>
</div>
</div>
</div>
<div class="form-group">
<div class="col-md-8">
<div class="input-wrapper">
<input id="email" name="email" type="text" placeholder="Email" class="form-control">
<label for="email" class="fa fa-envelope-o input-icon bigicon"></label>
</div>
</div>
</div>
<div class="form-group">
<div class="col-md-8">
<div class="input-wrapper">
<textarea class="form-control" id="message" name="message" placeholder="Message" rows="3"></textarea>
<label for="message" class="fa fa-pencil input-icon bigicon"></label>
</div>
</div>
</div>
<div class="form-group">
<div class="col-md-12 text-center">
<button type="submit" class="btn btn-outline-secondary btn-md">Submit</button>
</div>
</div>
</fieldset>
</form>
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>
</body>
</html>
html{
box-sizing: border-box;}
*,
*: before,
*: after {
box-sizing: inherit;
padding: 0;
margin: 0;
}
body{background-image: url();
width: 100%;
height: 100%;
background-position: bottom center;
background-repeat: no-repeat;
background-attachment: fixed;
background-size: cover;
background-color: #464646;
font-family:"Quicksand";
font-size: 1.2em;
line-height: 1.375em;
padding: 0;
margin: 0;
background-color: #2F3A3B;
overflow-x: hidden;
-webkit-font-smoothing: antialiased;
}
navbar-brand{
height: 3em;
width: 3em;
margin-top: -8px;
border-radius: 5.0em;
margin-right: 1em;
margin-left: -5em;
margin-bottom: -8px
}
.avatar{
border-radius: 5em;
margin-right: .5em;
margin-left: 1em;
}
.intro{
display: inline-block;
width: 100%;
padding: 65px 0 65px;
background-color: #2A2332;
background-size: cover;
font-size: 1.9em;
text-align: center;
color: #FFF;
}
h1{
font-weight: medium;
text-shadow:5px 5px 10px black;
}
h4{
font-size: -.5em;
}
.row{
margin-right: 4em;
margin-left: 4em;
margin-top: .10em;
padding-bottom: -.30em;
}
.container {
margin-left: 17em;
padding-top: 1.5em;
}
.bigicon {
font-size: 35px;
color: #808080;
}
.input-icon {
position: absolute;
left: .5rem;
top: .7rem;
/* Keep icon in center of input, regardless of the input height */
}
#message {
vertical-align: middle;
}
input {
padding-right:30px;
}
.form-control {
text-indent: 2rem;
width: 75%;
}
.input-wrapper {
position: relative;
}
.btn{
margin-right: 10em;
}
@media screen and (min-width: 640px){
}
@media screen and (min-width: 960px){
}
main {flex: 1;}
我的component.ts文件：
import {
Injectable
} from '@angular/core';
import {
Http,
HttpModule,
Headers,
RequestOptions,
Response
} from '@angular/http';
import { HttpClientModule } from '@angular/common/http';
import {
Observable
} from 'rxjs/Rx';
import 'rxjs/Rx'; //get everything from Rx
import 'rxjs/add/operator/toPromise';
import {
IProduct
} from "../models/iproduct";
@Injectable()
export class ProcessJsonService {
constructor(private http: Http) {}
//
getProcesslist() {
return this.http.request('http://www.json-generator.com/api/json/get/bVOdrzTUeq?indent=0')
.map(res => { console.log("I SEE DATA HERE: ", res.json())
return res.json(); })
}
}
我的HTML代码：
import { Component, OnInit } from '@angular/core';
import { IProduct } from "../models/iproduct";
import {
Http
} from '@angular/http';
import {
ProcessJsonService
} from '../models/myjsonprocess';
import {
Observable
} from 'rxjs/Rx';
@Component({
selector: 'app-product-list',
templateUrl: './product-list.component.html',
styleUrls: ['./product-list.component.css']
})
export class ProductListComponent implements OnInit {
pageTitle: string = 'Process List';
imageWidth: number = 50;
imageMargin: number = 2;
showImage: boolean = false;
listFilter: string = '';
processList: IProduct[];
errorMessage: string;
constructor(private _processJsonService: ProcessJsonService) {
this.processList = [];
}
ngOnInit(): void {
this._processJsonService.getProcesslist()
.subscribe(
processList => this.processList = processList)
}
}
问题是我没有在浏览器上显示我的数据，但是如果URL包含JSON数组，则数据会显示在浏览器中。
我在服务中添加了一个console.log来显示控制台中的res.json，我得到了它。我在组件中尝试了相同的（在ngOnInit中），但我没有在控制台中获取数据。这可能有助于找出问题所在。
请帮忙吗？
答案 0 :(得分：1)
您是说getProcessList()可以返回[{...}, {...}, {...}]和（如果只有一个流程）这样的内容会返回{...}吗？
如果是这种情况，则ngFor不会喜欢收到不是列表的内容，所以：
ngOnInit(): void {
this._processJsonService.getProcesslist()
.subscribe(processList => {
if (processList instanceof Array) {
this.processList = processList;
} else {
this.processList = [processList];
}
});
}