Question

I am writting some javascript class code, which will accept array of ‘Steps’ objects, and will perform steps navigations.

What I am planning to do is , whenever Next() method is called, it should call a callback function before going to next step.

pseduo code

var mySteps = {[1,"Step1","javascriptCallbackStep1"],[2,"Step2","javascriptCallbackStep2"]};
var StepsManager.Next = function() {
  var step = getcurrentStep();
  if(step.javascriptCallbackStep1())
      //go next
}

this javascriptCallbackStep1 is not getting called, any help with this little details will be greatly appreciated.

Thanks,

[Update:Answer]
I think I didnt ask it properly.

What I was trying to do was passing function name as string to javascript class property , and expecting it to be called.

passedValue = "MyFunctionName";
Class.Validate = passedValue;

And then finally for calling it was trying soemthing like below

Class.Validate();

Offcourse it was not working as in Class.Validate there was string, and there was no specification that treat it as function and not string.

So I successfully tried following

Class.Validate = function () { return window[passedValue](); };

It worked. Thanks anyways.

Answer 1

Javascript needs to be given a reference to a function to execute it. Passing the function itself or doing what @paul suggests is the surest way to write code that acts predictably/reliably.

You shouldn’t be passing the function name as a string, but know that you can:

function someFunction(name) { return "hello " + name; }
var fn = window["someFunction"]; 
console.log(fn("test"))

Change window to the namespace where the function lives