如何使用get http请求发送参数（id）？

Question

I started typing and http.get accepts only url so i don't have any idea how to send and id of a person to get that person from my api which gets it from Sql database .

public getByID(n :number) : Promise<any>{

    return this.http.get(this.url).toPromise();
  }

maybe appending it to an url ?

Answer 1

您可以选择使用模板字符串将参数添加到URL

return this.http.get(`${this.url}?id=${n}`).toPromise();

Answer 2

If you want to pass variables to the API using GET that would be possible using query string. Remember to escape (urlencode) them properly! It is also possible to use POST, if you dont want your variables to be visible.

Manually formatting the query string is fine for simple situations. But it can become tedious when there are many parameters.

You could write a simple utility function that handles building the query formatting for you.

function formatParams( params ){
return "?" + Object
    .keys(params)
    .map(function(key){
        return key+"="+encodeURIComponent(params[key])
    })
    .join("&")

}

And you would use it this way to build a request.

var endpoint = "https://api.example.com/endpoint"
var params = {
a: 1,
b: 2,
c: 3
}


return this.http.get(this.url+ formatParams(params)).toPromise();

Answer 3

Here is an example of what you would need to do

public getByID(n :number) : Promise<any>{  
    return this.http.get(this.url + '?id=' + number).toPromise();
}

Answer 4

If you want to pass id you can just make post request. It would like return this.http.post(this.url, {id: n}).toPromise() , second argument is just body of request, it can be an array of object, or just object. Then on the server side you just have to parse it to JSON format. You can also use get method, but then you have to send it as search url param. Take a look at this here