how can I decode the json object that has been sent in javascript to server and save them to variable op1,op2,opr.
and in java script i wanna decode the response sent by the server and save it variable result.
java script code:
var calculate = {
operand1 : null,
operand2 : null,
operator : null
};
function UserAction() {
var xhttp = new XMLHttpRequest();
xhttp.open("POST", "http://localhost:8000/", true);
xhttp.setRequestHeader("Content-type", "application/json");
xhttp.send(calculate);
var response = (xhttp.responseText);
console.log(response);
}
UserAction();
go server code:
package main
import ("fmt"
"net/http"
"encoding/json"
)
type answer struct {
result float64
}
func index(w http.ResponseWriter, r *http.Request) {
ans := answer{result: 30}
fmt.Println(r)
w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.WriteHeader(http.StatusOK)
if err := json.NewEncoder(w).Encode(ans); err != nil {
panic(err)
}
}
func main() {
http.HandleFunc("/",index)
http.ListenAndServe(":8000", nil)
}
The same way you can encode a payload in json in a http response, you can decode the body of a request.
err:= json.NewDecoder(request.Body).Decode(&answer);
Read Go documentation for future reference, and avoid any third party tutorial that doesn't clearly reference to the documentation.