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?

Answer 1

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).

Answer 2

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   
           }
       });

Answer 3

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.

Answer 4

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); 
}