我想从一个Angular组件触发HTTP请求，但我不知道如何向它添加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()
)
现在是我的静态设置。BASE_URL就像一个没有查询字符串的URL: http://atsomeplace.com/，但我想让它像http://atsomeplace.com/?var1=val1&var2=val2
如何添加var1，和var2到我的HTTP请求对象作为对象?
{
query: {
var1: val1,
var2: val2
}
}
然后只有HTTP模块将其解析为URL查询字符串。
当前回答
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);
}
如果你已经安装了jQuery，我做npm I jQuery—保存并包含在应用程序中。angular-cli.json中的脚本
其他回答
在最新的Angular 7/8中，你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);
}
编辑Angular >= 4.3.x
HttpClient是和HttpParams一起引入的。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)
编辑Angular >= 4.x
requestOptions。搜索已弃用。requestOptions使用。改为参数:
let requestOptions = new RequestOptions();
requestOptions.params = params;
原始答案(Angular 2)
您需要导入URLSearchParams，如下所示
import { Http, RequestOptions, URLSearchParams } from '@angular/http';
然后构建参数并像下面这样进行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())
...
角6
你可以通过使用params传入get调用所需的参数:
this.httpClient.get<any>(url, { params: x });
其中x = {property: "123"}。
对于记录“123”的api函数:
router.get('/example', (req, res) => {
console.log(req.query.property);
})
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);
}
如果你已经安装了jQuery，我做npm I jQuery—保存并包含在应用程序中。angular-cli.json中的脚本
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');
}
在我的分量中
userList: User[] = [];
this.userService.getUserByName(this.userName).subscribe(users => {
this.userList = users;
});
由邮递员
http://localhost:8080/test/user/?name=Ethem
