大家好我在Angular上创建HTTP请求,但我不知道如何向其添加url参数(查询字符串)。
this.http.get(StaticSettings.BASE_URL).subscribe(
(response) => this.onGetForecastResult(response.json()),
(error) => this.onGetForecastError(error.json()),
() => this.onGetForecastComplete()
);
现在我的StaticSettings.BASE_URL就像一个没有查询字符串的网址,如:http://atsomeplace.com/,但我希望它是http://atsomeplace.com/?var1=val1&var2=val2
哪里var1和var2适合我的Http请求对象?我想像对象一样添加它们。
{
query: {
var1: val1,
var2: val2
}
}
然后只是Http模块完成这项工作,将其解析为URL查询字符串。
答案 0 :(得分:280)
HttpClient 方法允许您在其选项中设置参数。
您可以通过从@ angular / common / http包导入 HttpClientModule 来配置它。
import {HttpClientModule} from '@angular/common/http';
@NgModule({
imports: [ BrowserModule, HttpClientModule ],
declarations: [ App ],
bootstrap: [ App ]
})
export class AppModule {}
之后,您可以注入 HttpClient 并使用它来执行请求。
import {HttpClient} from '@angular/common/http'
@Component({
selector: 'my-app',
template: `
<div>
<h2>Hello {{name}}</h2>
</div>
`,
})
export class App {
name:string;
constructor(private httpClient: HttpClient) {
this.httpClient.get('/url', {
params: {
appid: 'id1234',
cnt: '5'
},
observe: 'response'
})
.toPromise()
.then(response => {
console.log(response);
})
.catch(console.log);
}
}
对于版本4之前的角度版本,您可以使用 Http 服务执行相同操作。
Http.get 方法将实现RequestOptionsArgs的对象作为第二个参数。
该对象的搜索字段可用于设置字符串或URLSearchParams对象。
一个例子:
// Parameters obj-
let params: URLSearchParams = new URLSearchParams();
params.set('appid', StaticSettings.API_KEY);
params.set('cnt', days.toString());
//Http request-
return this.http.get(StaticSettings.BASE_URL, {
search: params
}).subscribe(
(response) => this.onGetForecastResult(response.json()),
(error) => this.onGetForecastError(error.json()),
() => this.onGetForecastComplete()
);
答案 1 :(得分:149)
HttpClient与HttpParams一起被引入。下面是一个使用示例:
import { HttpParams, HttpClient } from '@angular/common/http';
constructor(private http: HttpClient) { }
let params = new HttpParams();
params = params.append('var1', val1);
params = params.append('var2', val2);
this.http.get(StaticSettings.BASE_URL, {params: params}).subscribe(...);
(老答案)
requestOptions.search
已被弃用。请改用requestOptions.params
:
let requestOptions = new RequestOptions();
requestOptions.params = params;
您需要导入URLSearchParams
,如下所示
import { Http, RequestOptions, URLSearchParams } from '@angular/http';
然后构建您的参数并按如下方式生成http请求:
let params: URLSearchParams = new URLSearchParams();
params.set('var1', val1);
params.set('var2', val2);
let requestOptions = new RequestOptions();
requestOptions.search = params;
this.http.get(StaticSettings.BASE_URL, requestOptions)
.toPromise()
.then(response => response.json())
...
答案 2 :(得分:49)
使用Angular 5及更高版本,您不必使用HttpParams 。您可以直接发送您的json对象,如下所示。
let data = {limit: "2"};
this.httpClient.get<any>(apiUrl, {params: data});
请注意,数据值应为字符串,即; { params: {limit: "2"}}
使用 @ angular / common / http
中的 HttpParams,HttpClientimport { HttpParams, HttpClient } from '@angular/common/http';
...
constructor(private httpClient: HttpClient) { ... }
...
let params = new HttpParams();
params = params.append("page", 1);
....
this.httpClient.get<any>(apiUrl, {params: params});
可能会帮助一些人!
答案 3 :(得分:11)
角度6
您可以使用参数传递get调用所需的参数:
this.httpClient.get<any>(url, { params: x });
其中x = {属性:“ 123”}。
关于记录“ 123”的api函数:
router.get('/example', (req, res) => {
console.log(req.query.property);
})
答案 4 :(得分:8)
我的例子
private options = new RequestOptions({headers: new Headers({'Content-Type': 'application/json'})});
我的方法
getUserByName(name: string): Observable<MyObject[]> {
//set request params
let params: URLSearchParams = new URLSearchParams();
params.set("name", name);
//params.set("surname", surname); for more params
this.options.search = params;
let url = "http://localhost:8080/test/user/";
console.log("url: ", url);
return this.http.get(url, this.options)
.map((resp: Response) => resp.json() as MyObject[])
.catch(this.handleError);
}
private handleError(err) {
console.log(err);
return Observable.throw(err || 'Server error');
}
在我的组件中
userList: User[] = [];
this.userService.getUserByName(this.userName).subscribe(users => {
this.userList = users;
});
邮递员
http://localhost:8080/test/user/?name=Ethem
答案 5 :(得分:5)
如果您打算发送多个参数。
private options = {
sort: '-id',
select: null,
limit: 1000,
skip: 0,
from: null,
to: null
};
constructor(private service: Service) { }
ngOnInit() {
this.service.getAllItems(this.options)
.subscribe((item: Item[]) => {
this.item = item;
});
}
private options = new RequestOptions({headers: new Headers({'Content-Type': 'application/json'})});
constructor(private http: Http) { }
getAllItems(query: any) {
let params: URLSearchParams = new URLSearchParams();
for(let key in query){
params.set(key.toString(), query[key]);
}
this.options.search = params;
this.header = this.headers();
继续你的http请求@ethemsulan的做法。
router.get('/api/items', (req, res) => {
let q = {};
let skip = req.query.skip;
let limit = req.query.limit;
let sort = req.query.sort;
q.from = req.query.from;
q.to = req.query.to;
Items.find(q)
.skip(skip)
.limit(limit)
.sort(sort)
.exec((err, items) => {
if(err) {
return res.status(500).json({
title: "An error occurred",
error: err
});
}
res.status(200).json({
message: "Success",
obj: items
});
});
});
答案 6 :(得分:2)
您可以使用@ angular / common / http中的 HttpParams 并在查询中传递一个字符串。 例如:
import { HttpClient, HttpParams } from '@angular/common/http';
const query = 'key=value' // date=2020-03-06
const options = {
params: new HttpParams({
fromString: query
})
}
现在输入您的代码
this.http.get(urlFull, options);
这对您有用:)
我希望能帮助您
答案 7 :(得分:1)
在最新的Angular 7/8中,您可以使用最简单的方法:-
import { HttpClient, HttpHeaders, HttpParams } from '@angular/common/http';
getDetails(searchParams) {
const httpOptions = {
headers: { 'Content-Type': 'application/json' },
params: { ...searchParams}
};
return this.http.get(this.Url, httpOptions);
}
答案 8 :(得分:0)
import ...
declare var $:any;
...
getSomeEndPoint(params:any): Observable<any[]> {
var qStr = $.param(params); //<---YOUR GUY
return this._http.get(this._adUrl+"?"+qStr)
.map((response: Response) => <any[]> response.json())
.catch(this.handleError);
}
如果您有installed jQuery,我会npm i jquery --save
并在apps.scripts
中加入angular-cli.json
答案 9 :(得分:0)
import { Http, Response } from '@angular/http';
constructor(private _http: Http, private router: Router) {
}
return this._http.get('http://url/login/' + email + '/' + password)
.map((res: Response) => {
return res.json();
}).catch(this._handleError);
答案 10 :(得分:0)
您可以使用官方文档中的Url Parameters。
示例:this.httpClient.get(this.API, { params: new HttpParams().set('noCover', noCover) })