Question

I have a variable declared at the top of my function as this.current_test = null; and then down the line I have a setInterval function and I need to set the variable to a new parameter…

this.current_test.failed = true;

Code:

timer = this.window.setInterval(function() 
   {
      this.window.clearInterval(timer);
      this.current_test.failed = true;
   },1000);
 }

However I am getting a TypeError: 'undefined' is not an object (evaluating 'this.current_test.failed = true' error

And I assume this is because this.current_test is not defined inside the setInterval function, so how can I edit that variable?

Answer 1

The scope of your ‘this’ in the timer function will not refer to this.window. this scope is that for function only what you can do

var wnd=this.window; // take your widow to local variable
timer = this.window.setInterval(function() 
{
   this.window.clearInterval(timer);
   wnd.current_test.failed = true; // use your local variabe in the function
   },1000);
}

By the way for reffering to window why do you need ‘this’ and also the if cuurent_test is a global variable then you can declare like

var current_test;

and you can use the global variable inside the timer function