如何将url参数（查询字符串）传递给Angular上的HTTP请求

问题描述

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）。

Hi guys I'm creating a HTTP request on Angular, but I do not know how to add url arguments (query string) to it.

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就像一个没有查询的网址字符串如：但我希望它是

Now my StaticSettings.BASE_URL is something like a url with no query string like: http://atsomeplace.com/ but I want it to be 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。

Where var1, and var2 fit on my Http request object? I want to add them like an object.

{
  query: {
    var1: val1,
    var2: val2
  }
}

然后只是Http模块完成工作将其解析为URL查询字符串。

and then just the Http module do the job to parse it into URL query string.

推荐答案

方法允许您设置 params 在它的选项中。

您可以通过导入 。

You can configure it by importing the HttpClientModule from the @angular/common/http package.

import {HttpClientModule} from '@angular/common/http';

@NgModule({
  imports: [ BrowserModule, HttpClientModule ],
  declarations: [ App ],
  bootstrap: [ App ]
})
export class AppModule {}

之后你可以注入 HttpClient 并使用它来执行请求。

After that you can inject the HttpClient and use it to do the request.

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);
  }
}

你可以找到一个工作示例。

You can find a working example here.

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。

For angular versions prior to version 4 you can do the same using the Http service.

Http.get method接受一个实现的对象第二个参数。

The Http.get method takes an object that implements RequestOptionsArgs as a second parameter.

该对象的搜索字段可用于设置字符串或对象。

The search field of that object can be used to set a string or a URLSearchParams object.

例如：

 // 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()
 );

Http 类的文档有更多细节。它可以在和一个工作示例中找到。

The documentation for the Http class has more details. It can be found here and an working example here.

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