Question

I had a previous question can jquery ajax call external webservice?

and some good developers answered me to use jsonp, but i don’t know how to use it, i am trying to call my service using this code:

$.ajax({             type: 'POST',             url: 'http://localhost:1096/MySite/WebService.asmx?callback=?',             data: '{}',             contentType: 'application/json; charset=utf-8',             dataType: 'jsonp',             success: function(msg) {alert(msg);}             }); 

and this is my service code:

[WebMethod] public string HelloWorld() {     return 'Hello World ' ; } 

anyone have examples or can explain this issue for me?

UPDATE:
I wrote the code again to be like this:

$.getJSON('http://localhost:1096/YourShoppingTest1/WebService.asmx/HelloWorld?jsonp=?',{name:'test'},     function(data){     alert(data.x);     }); 

and the service like this:

[WebMethod] public string HelloWorld(string name) {     return '( {\'x\':10 , \'y\':100} )'; } 

But it always give me this error when back: ‘missing ; before statement [Break on this error] ( {‘x’:10 , ‘y’:100} )’

and never call the success function, can anyone help with that?

Answer 1

I’ve had a similiar problem, unfortunately I don’t have the code at hand.

From memory:

• Add [ScriptService] as an attribute to your Web Method
• Also change your url to call the HelloWorld procedure.
  Something like http://localhost:1096/MySite/WebService.asmx/HelloWorld?callback

See: What are some good examples of JQuery using JSONP talking to .net? & What is the best way to call a .net webservice using jquery?