Call javascript from MVC controller action

Question

Can I call javascript function from MVC controller action  not from view page  and get return value  How     I need to make request to server from code   cs  using javascript like here  but this is aspx page   function getInitData      var code  code    return      code     me  API getProfiles  uids  API getVariable  key  1280    fields   photo    0     code         VK Api call  execute      code   code    onGetInitData

User · Answer

If I understand correctly the question  you want to have a JavaScript code in your Controller   Your question is clear enough  but the voted and accepted answers are throwing some doubt  So  you can do this by using the  NET s System Windows Forms WebBrowser control to execute javascript code  and everything that a browser can do  It requires reference to System Windows Forms though  and the interaction is somewhat  old school   E g   void webBrowser1 DocumentCompleted object sender       WebBrowserDocumentCompletedEventArgs e        HtmlElement search   webBrowser1 Document GetElementById  searchInput        if search    null                search SetAttribute  value    Superman            foreach HtmlElement ele in search Parent Children                        if  ele TagName ToLower       input   amp  amp  ele Name ToLower       go                                 ele InvokeMember  click                    break                                    So probably nowadays  that would not be the easiest solution   The other option is to use Javascript  NET or jint to run javasctipt  or another solution  based on the specific case   Some related questions on this topic or possible duplicates   Embedding JavaScript engine into  NET  Load a DOM and Execute javascript  server side  with  Net  Hope this helps

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There are ways you can mimic this by having your controller return a piece of data  which your view can then translate into a JavaScript call   We do something like this to allow people to use RESTful URLs to share their jquery-rendered workspace view   In our case we pass a list of components which need to be rendered and use Razor to translate these back into jquery calls

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You can call a controller action from a JavaScript function but not vice-versa  How would the server know which client to target  The server simply responds to requests   An example of calling a controller action from JavaScript  using the jQuery JavaScript library  in the response sent to the client     ajax              type   POST              url    Controller Action      the URL of the controller action method            data  null     optional data            success  function result                       do something with result                                          error   function req  status  error                       do something with error

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It is late answer but can be useful for others  In view use ViewBag as following    Html Raw   lt script gt     ViewBag DynamicScripts     lt  script gt      Then from controller set this ViewBag as follows   ViewBag DynamicScripts    javascriptFun       This will execute JavaScript function   But this function would not execute if it is ajax call  To call JavaScript function from ajax call back  return two values from controller and write success function in ajax callback as following     ajax          type   POST          url    Controller Action      the URL of the controller action method        data  null     optional data        success  function result                   do something with result                success  function result  para            if para     something                  run JavaScript function                                           error   function req  status  error                   do something with error                      from controller you can return two values as following   return Json new   json   jr Data  value2    value2

User · Answer

Yes  it is definitely possible using Javascript Result   return JavaScript  Callback        Javascript should be referenced by your view   function Callback           do something where you can call an action method in controller to pass some data via AJAX   request

User · Answer

The usual standard way in MVC is that you should put call your all display  UI  CSS and Javascript in View  however there is no rule to it  you can call it in the Controller as well if you manage to do so  something i don t see the possibility of

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lt script gt        document  ready function              var msg     ViewBag ErrorMessage          if  msg length  gt  0              OnFailure  Register   msg                function OnSuccess header Message                Message Header   text header               Message Text   text Message               MessageDialog   modal  show               function OnFailure header error                    Message Header   text header               Message Text   text error               MessageDialog   modal  show           lt  script gt

User · Answer

For those that just used a standard form submit  non-AJAX   there s another way to fire some Javascript JQuery code upon completion of your action   First  create a string property on your Model     public class MyModel        public string JavascriptToRun   get  set       Now  bind to your new model property in the Javascript of your view    lt script type  text javascript  gt        Model JavascriptToRun  lt  script gt    Now  also in your view  create a Javascript function that does whatever you need to do    lt script type  text javascript  gt        Model JavascriptToRun       function ShowErrorPopup               alert  Sorry  we could not process your order              lt  script gt    Finally  in your controller action  you need to call this new Javascript function    HttpPost  public ActionResult PurchaseCart MyModel model           Do something useful              if  success    false                model JavascriptToRun   ShowErrorPopup             return View model             else         return RedirectToAction  Success

User · Answer

Since your controller actions execute on the server  and JavaScript  usually  executes on the client  browser   this doesn t make sense  If you need some action to happen by default once the page is loaded into the browser  you can use JavaScript s document OnLoad event handler

[javascript] Call javascript from MVC controller action

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