How to send and retrieve data from web method using JQuery Ajax Call? [duplicate]

Question

I have a text box and a button next to it. I want to send the content of textbox through Jquery ajax call to webmethod and get back the upper case value of the same and display that in alert. So far i have this code but its not working.

JAVASCRIPT:

function CallWM()
    {          

        var name = $('#name').val();         


        RealCallWM(name);


    }
    function RealCallWM(name) {

        $.ajax({
            url: 'Register.aspx/UpperWM',
            type: 'POST',
            contentType: 'application/json; charset=utf-8',
            data: { name: JSON.stringify(name) },
            success: OnSuccess(response),
            error: function (response) {
                alert(response.responseText);
            }
        })
    };

HTML:

  Name:    <input id="name" type="text" /> 
<input id="Button1" type="button" value="button" onclick="CallWM();"/></div>
    </form>

WEB METHOD:

 [WebMethod]
        public static string UpperWM(string name )
        {
            var msg=name.ToUpper();
            return (msg);
        }

@Delphian i made changes as suggested by Darin but i am getting console error "Uncaught ReferenceError: response is not defined " — SamuraiJack
– SamuraiJack, Commented Jul 15, 2013 at 14:25
what is the use of "msg" in function "CallWM", and you are not passing the value while calling — Able
– Able, Commented Jul 15, 2013 at 14:29

Darin Dimitrov · Accepted Answer · 2013-07-15 13:56:23Z

4

Replace:

data: '{name: ' + name + '}',

with:

data: { name: JSON.stringify(name) },

to ensure proper encoding. Right now you are sending the following payload:

{name:'some value'}

which is obviously an invalid JSON payload. In JSON everything should be double quoted:

{"name":"some value"}

That's the reason why you should absolutely never be building JSON manually with some string concatenations but using the built-in methods for that (JSON.stringify).

Side note: I am not sure that there's a callback called failure that the $.ajax method understands. So:

$.ajax({
    url: 'Register.aspx/UpperWM',
    type: 'POST',
    contentType: 'application/json; charset=utf-8',
    data: { name: JSON.stringify(name) },
    success: OnSuccess(response),
    error: function (response) {                        
        alert(response.responseText);
    }
});

Also notice that in your error callback I have removed the response.d property as if there's an exception in your web method chances are that the server won't return any JSON at all.

edited Jul 15, 2013 at 13:56

answered Jul 15, 2013 at 13:50

Darin Dimitrov

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8 Comments

Karl Anderson Over a year ago

Just for further edification, see What is the difference between JSON and Object Literal Notation?

Karl Anderson Over a year ago

Darin is correct, there is no failure callback for the jQuery.ajax() method.

SamuraiJack Over a year ago

SOrry for responding late, i made the changes but i am getting the console error "ncaught ReferenceError: CallWM is not defined"

Darin Dimitrov Over a year ago

Where is this javascript code written? Is it in a separate javascript file? Did you reference this file in your WebForm? Also you must reference it before the button. Also since you are using jQuery don't forget to reference that as well before your custom javascript code.

SamuraiJack Over a year ago

It is in the same file within the head tags.

|

Able · Accepted Answer · 2013-07-15 14:46:42Z

2

As per your comment I understood your issue not yet resolved, so just try this

    function RealCallWM(name) {
        $.ajax({
            type: "POST",
            url: "Default.aspx/UpperWM",
            data: JSON.stringify({ name: $('#name').val() }),
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            async: true,
            success: function (data, status) {
                console.log("CallWM");
                alert(data.d);
            },               
            failure: function (data) {
                alert(data.d);
            },
            error: function (data) {
                alert(data.d);
            }
        });
    }

answered Jul 15, 2013 at 14:46

Able

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1 Comment

SamuraiJack Over a year ago

Same error Uncaught ReferenceError: response is not defined I guess we are looking for problem at he wrong place. I know it must be something silly, i am trying to figure out whats causing this error.

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