webmethod returning whole html instread string value

Question

I am trying to call asp.net webmethod from xmlhttp object.

My webmethod is like this

[WebMethod]
public string getCities(string province)

And my javascript is like following

 xmlhttp=new XMLHttpRequest({mozSystem: true});
 xmlhttp.open("POST","http://www.rental-1.com/lp.aspx/getCities/Ontario",true);
  xmlhttp.send();
 xmlhttp.onreadystatechange=function(){
alert(xmlhttp.readyState+", "+xmlhttp.status);
if (xmlhttp.readyState==4 && xmlhttp.status==200){
var v1=xmlhttp.responseText;
alert(v1);
}}

In response I am getting the whole html of the page. But above I am calling just webmethod and I expecting string value in return.

Any help will be appreciated. Why I am not getting just string value instead of html of the page

here is my server side code

[WebMethod]
public static List<string> getCities(string province)
{

    List<string> strp = new List<string>();



            strp=getCitiesFromDB(province);

    return strp;
}

@Quentin actually if u just read the question u will find out it not the same. — user4545762
– user4545762, Commented Mar 22, 2015 at 16:57
Your change to the question doesn't make any sense. You make a request to the URL. You get the body of the response in a string. Since that URL gives you an HTML document you get a complete HTML document in the string. — Quentin
– Quentin, Commented Mar 22, 2015 at 16:59
@Quentin Yes that is the question. How can I call webmethod from xmlhttp object — user4545762
– user4545762, Commented Mar 22, 2015 at 17:02
You appear to be doing that already. The web method just isn't doing what you want it to do. That isn't a problem with the JavaScript. — Quentin
– Quentin, Commented Mar 22, 2015 at 17:03

Dave Ward · Accepted Answer · 2015-03-22 19:07:08Z

1

ASP.NET will only invoke your web method if you use a post request (which you are) and send any parameters to the server as JSON (which you aren't). When those requirements aren't met, ASP.NET will just treat your request as a normal one to the underlying ASPX page. That's why you're seeing the full page's HTML returned.

If you JSON.stringify({ province: 'Ontario' }), set a content type header of application/json, and send that as your POST data, you should get a JSON array back from ASP.NET instead of the full page's HTML.

See the last section of this post for the specifics: http://encosia.com/asmx-and-json-common-mistakes-and-misconceptions/

answered Mar 22, 2015 at 19:07

Dave Ward

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6 Comments

user4545762 Over a year ago

I am calling a method with parameter "province" which is string. My question is what will my url be. should it be rental-1.com/lp.aspx?op=getCities?v. v is json object. But it is not working

Dave Ward Over a year ago

@user4545762: A URL like lp.aspx/getCities is okay, but the JSON object needs to be sent as the request's POST data, not on the querystring.

user4545762 Over a year ago

can you show me how to do it in request's POST data?

Dave Ward Over a year ago

@user4545762: I don't have a raw XMLHttpRequest sample handy, but it would be

$.ajax('lp.aspx/getCities', { type: 'post', contentType: 'application/json', data: JSON.stringify({ province: 'Ontario' }), success: function(response) { console.log(response); } });

using jQuery's $.ajax.

user4545762 Over a year ago

I am looking for javascript solution and not jquery. can you please let me know the pure javascript solution. Just tell me how can I embed parameter info in post data

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