The Angular4 HTTP POST method fails to send data to the web API

Whenever I make a http post request, it keeps returning an error message saying "data does not pass correctly". I have tried passing the data through the body and also attempted using json.stringify(). Additionally, I experimented with setting the content type but none of these solutions seemed to work.

const headers = new Headers({ 'Content-Type': 'application/json' });
const options = new RequestOptions({ headers: headers });
this.http_.post('http://localhost:12412/api/employee', remark, options)
  .subscribe((data) => {console.log(data)})};  

The post call method in the component.ts file is included below:

import { Component, OnInit } from '@angular/core';
import 'rxjs/add/operator/map';
import { Injectable } from '@angular/core';
import { Response, Headers, RequestOptions,Http} from '@angular/http';
import { HttpClient} from '@angular/common/http';
import { Time } from '@angular/common/src/i18n/locale_data_api';
import { NgbDateStruct } from '@ng-bootstrap/ng-bootstrap/datepicker/ngb-date-struct';
import { NgbCalendar } from '@ng-bootstrap/ng-bootstrap/datepicker/ngb-calendar';
import {Ng2OrderModule} from 'ng2-order-pipe';
import {Observable} from "rxjs/Rx";
import { PostChangesService } from './PostChanges.service';
import { Body } from '@angular/http/src/body';


@Component({
  selector: 'app-table',
  templateUrl: './table.component.html',
  styleUrls: ['./table.component.css']
})

export class TableComponent implements OnInit {
  constructor(private http: HttpClient, private http_:Http){

  }

  EditValue(event,remark,log_id) {
    console.log(remark+" "+log_id );

    const headers = new Headers({ 'Content-Type': 'application/x-www-form-urlencoded' });
    const options = new RequestOptions({ headers: headers });

   this.http_.post('http://localhost:12412/api/employee?',remark,options)
    .subscribe((data) => {console.log(data)} 
   )};  
  }
}

Here is the web api post method that corresponds with the above code:

[HttpPost]
public string Post([FromBody]string remark)
{
    if (remark != null)
    {
        return remark + " _ " ;
    }
    else
        return "data doesn't pass correctly";
}

Answer №1

You can improve your data handling by structuring your post data as an object in the following way:

 // Create an object with 'remark' property
 let body = JSON.stringify({ remark: remark });
 
 this.http_.post('http://localhost:12412/api/employee', body, options)
   .subscribe((data) => {
     console.log(data);
   }); 

Creating a Web API POST method

[HttpPost]
public string Post([FromBody]RemarkModel model)
{
   if (model.remark != null)
   {
        return model.remark + " _ ";
   }
   else
   {
        return "Data was not passed correctly";             
   }
}

public class RemarkModel
{
   public string remark { get; set; }
}

Answer №2

If you want to update your script, consider the following adjustment:

let details = {
   note : remark
};

this.http_.post('http://localhost:12412/api/employee',JSON.stringify(details),options)
   .subscribe((result) => {console.log(result)}); 

There is no need to modify the Web API. This modification should function properly.

Answer №3

Include Headers from @angular/http

Post=(url:string,data:any)=>{
    this.headers = new Headers();
    let options = new RequestOptions({ headers: this.headers, method: "post"}); 
    return this.http.post(
        url,
        data,
        options
    );
}

It did the trick for me ;)

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