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

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);
}

其他回答

版本5 +

在Angular 5及更高版本中,你不必使用HttpParams。您可以直接发送json对象,如下所示。

let data = {limit: "2"};
this.httpClient.get<any>(apiUrl, {params: data});

请注意,数据值应该是字符串,即;{params: {limit: "2"}}

版本4.3.x +

使用@angular/common/http中的HttpParams、HttpClient

import { 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});

另外,尝试使用JSON.stringify()对嵌套对象进行字符串化。

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())
...

你可以使用@angular/common/http中的HttpParams,并在查询时传递一个字符串。 例如:

import { HttpClient, HttpParams } from '@angular/common/http';
const query = 'key=value' // date=2020-03-06

const options = {
  params: new HttpParams({
    fromString: query
  })
}

现在在你的代码中

this.http.get(urlFull, options);

这对你有用:)

我希望能帮到你

您可以使用官方文档中的Url参数。

操作:这个httpClient。得到(这个。火,(params: new HttpParams()。集合(“noCover”,noCover)

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);