Calling ASP.Net Code Behind using jQuery AJAX

The $.ajax() function in jQuery allows you to make asynchronous HTTP requests to server-side methods, including those defined in a C# class, commonly used in web applications. In your example, the $.ajax() function is used to make an asynchronous request to the getOutput() web method, and it can be configured to handle the response from the server once the request is completed, enabling dynamic interactions between client-side JavaScript and server-side code in C# or any other server-side technology.

jQuery Source Code
<script> $(document).ready(function () { $.ajax({ type: "POST", url: "jQueryCall.aspx/getOutput", contentType: "application/json; charset=utf-8", dataType: "json", success: function (response) { $("#Content").text(response.d); }, failure: function (response) { alert(response.d); } }); }); </script>

Here we are specifying success: and failure: to show the kind of return data format we are expecting from the web method.

success: function (response)

When the requested web method is successfully executed and the AJAX request is completed, you can specify a success callback function using the .done() or .success() method in jQuery. This callback function will be invoked to process the output or response from the web method. It allows you to handle and manipulate the data returned from the server after a successful execution, enabling dynamic updates and interactions in your web application.

Failure:Function(responce)

In jQuery's AJAX functionality, you can specify an error handling callback function using the .fail() or .error() method. This callback function will be executed when an exception or error occurs during the execution of the web method. It allows you to handle and respond to errors, providing a way to deal with unexpected issues that may arise during the AJAX request to the server-side method.

C# Source Code
using System.Web.Services; namespace WebApplication { public partial class jQueryCall : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } [WebMethod] public static string getOutput() { return "This is from C# code behind!!"; } } }

When using AJAX to call a C# method in the code-behind of a web page, the method must be defined as a static method in the code-behind file. This is because AJAX requests are typically stateless, and static methods do not rely on the instance state of the page. Static methods can be called directly without needing to create an instance of the page or control.

Conclusion

To call ASP.NET code-behind methods using jQuery AJAX, you need to define the server-side method as a static method marked with the [WebMethod] attribute. This enables the method to be invoked asynchronously via AJAX from the client-side JavaScript, facilitating communication between client and server for dynamic web applications.






Related Topics
  1. jQuery Interview Questions (Part-2)
  2. jQuery Interview Questions (Part-3)
  3. Is jQuery a programming language?
  4. Why do we need to go for JQuery?
  1. How to check jQuery version?
  2. How to multiple version of jQuery?
  3. What is jQuery CDN?
  4. Advantages of minified version of JQuery
  5. How do I check if the DOM is ready?
  6. How to Use the jQuery load() Method
  7. Difference between document.ready() and body onload()?
  8. Is jQuery is a replacement of JavaScript?
  9. JQuery or JavaScript which is quicker in execution?
  10. What is the use of param() method in jquery
  11. How to work with jQuery parent(), children() and siblings()?
  12. Difference between parent() and parents() in jQuery?
  13. What does jQuery data() function do?
  14. How do you check if an element exists or not in jQuery?
  15. How do I check if an HTML element is empty using jQuery?
  16. How to run an event handler only once in jQuery?
  17. How to Disable or Enable a Form Element Using jQuery
  18. Hide and show image on button click using jQuery
  19. Difference Between Prop and Attr in jQuery
  20. How do I check if an element is hidden in jQuery?
  21. Difference between return false; and e.preventDefault()
  22. What is each() function in jQuery? How do you use it?
  23. Which one is more efficient, document.getElementbyId( "myId") or $("#myId)?
  24. What is the difference between $.map and $.grep in jQuery
  25. What is the use of serialize method in jQuery
  26. What is the use of clone method in jQuery?
  27. What is event.PreventDefault in jQuery?
  28. Difference between event.PreventDefault and event.stopPropagation?
  29. What are deferred and promise object in jQuery?
  30. What are source maps in jQuery?
  31. What does the jQuery migrate function do?
  32. Differences Between jQuery .bind() and .live()?
  33. How can you delay document.ready until a variable is set?
  34. How to disable cut,copy and paste in TextBox using jQuery?
  35. How to prevent Right Click option using jquery?
  36. How does the jQuery pushStack function work?
  37. Why use jQuery filter() Methods?
  38. Difference between find() and closest() in jquery?
  39. How To Use Ajax In Jquery?
  40. How to multiple AJAX requests be run simultaneously in jQuery?
  41. How to include jQuery in ASP.Net project?
  42. Need to add jQuery file in both Master and Content page?
  43. Uncaught TypeError: $(…).modal is not a function jquery
  44. How to check whether a checkbox is checked in jQuery?
  45. Uncaught ReferenceError: $ is not defined
  46. How to Convert JSON Date to JavaScript/jQuery date