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JQuery-AJAX: Change a HTML control name from server



I want to share a very basic and simple but a bit advance sample code on ASP.Net Ajax using JSON and JQuery. Now I want to change a control name or text based on server response data.

To demonstrate this thing I shall change my clicked button name based on server. This type of sample code is very easy to learn and you can use similar concept to develop solution for lots of requirement. Say you are developing some code where you have a button to 'Like' but after clicking on it the button  name will change to 'Unlike', or in a social network one user will start following some group or person; so when user will click on 'Follow' button will be changed to 'Following' etc.
Lets have a look in to the code:

HTML for this solution as below -
in put id="btnClick" type="button" value="Click Me!"

Here button 'btnClick' text will be changed. Next look into the back-end C# code.


[WebMethod]
public static string ChangeButtonNameJQuery(string btnName)
{     
      return btnName+ " - changed from Server";
}



Very simple Web Method or WebService in page 'ChangeButtonName.aspx'. To declare a page method as WebService we need to use namespace 'System.Web.Services', which I have used in using namespace section. Besure this method is 'static' type and its 'public'. Return type of webservice is string and invoking with one string parameter 'btnName'.

Now look at the jQuery code.



"js/jquery-1.9.1.js">
"text/javascript">
      $(document).ready(function () {
            $("#btnClick").click(function () {               
                
                $.ajax({
                    type: "POST",
                    url: "ChangeButtonName.aspx/ChangeButtonNameJQuery",
                    data: JSON.stringify({ btnName: $("#btnClick").val() }),
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function (msg) {                       
                        $("#btnClick").val(msg.d);                       
                    }
                });
            });
        });

I have used here Jquery version 1.9.1 and calling my method when document becomes ready to execute which will call just after loading completion of page.



$(document).ready(function ()
{
}

the above code is doing this thing (to know details about Jquery Ajax calling from ASP.Net, read my 1st post on Jquery-Ajax). In my present code We are calling web method 'ChangeButtonNameJQuery' from current page (ChangeButtonName.aspx/ChangeButtonNameJQuery). Once successful web method execution client browser is getting response and invoking method 'success:' with response in object 'msg'. We can access server response from 'msg' property 'd' by using 'msg.d' and that I am setting to change button value, by


$("#btnClick").val(msg.d);

I hope you have enjoyed this post and has helped to learn little more on ASP.Net ajax using JQuery. Continue reading my next blog post to know more on Ajax using JQuery.

Thank you for visiting my blog. Happy coding.

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