how to get data from WebMethod in angular2 - http

Question

In Javascript using Ajax
$.ajax({
type: "Get",
url: "AttendanceMaster.aspx/GetDistinctBatch",
data: "{}",
contentType: "application/json; charset=utf-8",
datatype: "jsondata",
async: "true",
success: function(response) {
},
error: function(response) {
alert("(allstudent )" + response.status + ' Error ' + response.statusText);
}
});
tried following for angular2
return this._http.get("AttendanceMast.apsx/GetDistinctBatch")
.map((response) => response.toString());
it returns
{ "_isScalar": false, "source": { "_isScalar": false }, "operator": {} }
C#
[System.Web.Services.WebMethod]
public static string GetDistinctBatch()
{
return "welcome Angular 2";
}
1) how to use in angular2?
See Error below

Answer 1

Your method is just returning Observable, they will just sit as a function. Observable are lazy in nature. They wouldn't get executed until you subscribe to them.
AttendanceMast() {
return this._http.get("AttendanceMast.apsx/GetDistinctBatch")
.map((response) => response.toString()); //better do it response.json();
}
myService.AttendanceMast().subscribe(
data => console.log(data);
)

Answer 2

dataservice
getwithParamter(): Observable<JSON> {
this.headers = new Headers();
this.headers.append('Content-Type', 'application/json; charset=utf-8');
let options = new RequestOptions({
method: RequestMethod.Post,
url: "AttendanceMast.aspx/HelloWorldss",
headers: this.headers,
body:{program: 'pravin'} //same like data: "{}" in ajax
});
return this._http.request(new Request(options)).retry(2)
.map((response: Response) => response.text())
.do(data => console.log('All: ' + JSON.stringify(data)))
.catch(this.handleError);
}
handleError(error: any) {
console.error('An error occurred', error);
return Promise.reject(error.message || error);
}
C#
[System.Web.Services.WebMethod]
public static string HelloWorldss(string program)
{
return "welcome Angular" + program;
}
call
this.dataService.getwithParamter().subscribe(
tradeshows => this.getwithparamter = tradeshows,
error => console.error('Error: ' +error)
);
print this variable showing your output this.getwithparamter

Answer 3

I assume you are using the standard configuration for a WebService. If so, I believe your problem is that your are using the inbuilt rest capability of Angular2 to access a WebService, aka a Soap service, returning xml soap envelopes. Hence the 404.
Unfortunately, you have a bit more work to do to make it work than if you were accessing a rest service.
Have a look at angular2-soap on github. It should get you on the right track.