B4J Question [WebApp] B4J Websocket: Call a JS-Function that is not in the window-scope?

[Kiffi]

Hello,

calling a JS-Function from a B4J-Websocket-Server, that is in the window-scope (with ws.RunFunction("myTest", Args)) works like a charm:

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

      [...]
     
    });
});

function myTest() {
  // no problem here
};

but i don't know how to call a JS-Function, that is not in the window-scope:

$(function () {
    $(document).ready(function () {
       
        [...]

        function myTest() {
           // i don't know how to call this function
           // i get 'undefined is not a function'
        };

    });
});

because b4j_runFunction() wants to apply a function in the window-scope:

function b4j_runFunction(func, params) {
    return window[func].apply(null, params);
}

Any ideas how to solve it?

Thanks in advance & Greetings ... Kiffi

 

[warwound]

I'm not a user of jquery (that is jquery syntax i see you using?) but can you try something like this:

window.myTest=function(){
  alert('Hello World');
}

Martin.

(Edited to correct function name)

 

[Erel]

The function you created is not accessible from outside (unless you follow @warwound suggestion):
https://developer.mozilla.org/en/do..._function_scope#Nested_functions_and_closures

 

[Kiffi]

Hello warwound,
hello Erel,

thanks for your fast replies!

@warwound: your solution works but it is unfortunately impractical for me because then the function is not accesible from the other 'inner' functions.

@Erel: Thanks for the background informations!

Perhaps i use b4j_eval()...

Thanks again & Greetings ... Kiffi

 

[Erel]

WebSocket.RunEval will not help here. The inner function is not accessible from outside of the outer function.

You cannot call it from JavaScript either.

Why don't you make it a regular function? What is it needed for at all?

 

[warwound]

@warwound: your solution works but it is unfortunately impractical for me because then the function is not accesible from the other 'inner' functions.

You could declare all functions locally and then create global references to any of these (local) function(s) that require global scope:

function myTest(){
  alert('Hello World');
}

function doSomething(){
  console.log('Hello World');
}

window.myTest=myTest;

Martin.

 

[Kiffi]

You could declare all functions locally and then create global references to any of these (local) function(s) that require global scope: [...]

Perfect! Works like a charm. Thank you very much!

What is it needed for at all?

i have written a tool that converts PureBasic to JavaScript (PB2Web). And now i want to implement an interface to connect a B4J-Websocket-Server. The first steps are very promising.

Greetings ... Kiffi

 

[Erel]

Note that the last step is not required. You just need to declare the functions. They will be declared in the window scope.

 

[Kiffi]

Hello Erel,

this is, what i'm doing now:

$(function () {
  $(document).ready(function () {
    [...]

    function myTest() {
      [...]
    });

    window.myTest = myTest;

  });
});

and now i'm able to access the function with:

ws.RunFunction("myTest", Args)

Thanks again & Greetings ... Peter

 

[Erel]

This is a good solution. This code will also work:

$( document ).ready(function() {
  b4j_connect("...");
});
function myTest() {
 ...
}