How to call a C function from JavaScript

Question

I want to call CsharpFunction  a C  function in code-behind  from JavaScript  I tried the code below but whether the JavaScript condition is True or False  CsharpFunction was called regardless   JavaScript code   if  Javascriptcondition  gt  0        lt  CsharpFunction     gt      C  code behind   protected void CsharpFunction          Notification show        How do I call a C  function from JavaScript

User · Answer

Use Blazor http   learn-blazor com architecture interop   Here s the C    namespace BlazorDemo Client      public static class MyCSharpFunctions             public static void CsharpFunction                         Notification show                      Then the Javascript   const CsharpFunction   Blazor platform findMethod   BlazorDemo Client    BlazorDemo Client    MyCSharpFunctions    CsharpFunction     if  Javascriptcondition  gt  0       Blazor platform callMethod CsharpFunction  null

User · Answer

A modern approach is to use ASP NET Web API 2  server-side  with jQuery Ajax  client-side    Like page methods and ASMX web methods  Web API allows you to write C  code in ASP NET which can be called from a browser or from anywhere  really   Here is an example Web API controller  which exposes API methods allowing clients to retrieve details about 1 or all products  in the real world  products would likely be loaded from a database    public class ProductsController   ApiController       Product   products   new Product                   new Product   Id   1  Name    Tomato Soup   Category    Groceries   Price   1             new Product   Id   2  Name    Yo-yo   Category    Toys   Price   3 75M             new Product   Id   3  Name    Hammer   Category    Hardware   Price   16 99M                 Route  api products         HttpGet      public IEnumerable lt Product gt  GetAllProducts                 return products              Route  api product  id          HttpGet      public IHttpActionResult GetProduct int id                var product   products FirstOrDefault  p    gt  p Id    id           if  product    null                        return NotFound                      return Ok product             The controller uses this example model class   public class Product       public int Id   get  set        public string Name   get  set        public string Category   get  set        public decimal Price   get  set        Example jQuery Ajax call to get and iterate over a list of products     document  ready function             Send an AJAX request       getJSON   api products            done function  data                   On success   data  contains a list of products                each data  function  key  item                       Add a list item for the product                      lt li gt      text  formatItem item     appendTo     products                                       Not only does this allow you to easily create a modern Web API  you can if you need to get really professional and document it too  using ASP NET Web API Help Pages and or Swashbuckle   Web API can be retro-fitted  added  to an existing ASP NET Web Forms project  In that case you will need to add routing instructions into the Application Start method in the file Global asax   RouteTable Routes MapHttpRoute      name   DefaultApi       routeTemplate   api  controller   id        defaults  new   id   System Web Http RouteParameter Optional        Documentation   Tutorial  Getting Started with ASP NET Web API 2  C   Tutorial for those with legacy sites  Using Web API with ASP NET Web Forms MSDN  ASP NET Web API 2

User · Answer

If you re meaning to make a server call from the client  you should use Ajax - look at something like Jquery and use   Ajax   or   getJson   to call the server function  depending on what kind of return you re after or action you want to execute

User · Answer

You can use a Web Method and Ajax    lt script type  text javascript  gt                Default aspx    function DeleteKartItems                     ajax            type   POST            url   Default aspx DeleteItem            data               contentType   application json  charset utf-8            dataType   json            success  function  msg                     divResult   html  success                         error  function  e                     divResult   html  Something Wrong                               lt  script gt    WebMethod                                    Default aspx cs public static void DeleteItem           Your Logic

User · Answer

Server-side functions are on the server-side  client-side functions reside on the client  What you can do is you have to set hidden form variable and submit the form  then on page use Page Load handler you can access value of variable and call the server method   More info can be found here and here

User · Answer

CS File         namespace Csharp             public void CsharpFunction                     Code                     JS code      function JSFunction                  lt   ProjectName Csharp CsharpFunction    gt            Note  in JS Function when call your CS page function     first name of project then name of name space of CS page then function name

User · Answer

You can t  Javascript runs client side  C  runs server side   In fact  your server will run all the C  code  generating Javascript  The Javascript then  is run in the browser  As said in the comments  the compiler doesn t know Javascript   To call the functionality on your server  you ll have to use techniques such as AJAX  as said in the other answers

[javascript] How to call a C# function from JavaScript?

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