Listen to js variable change

Let’s say there is a code in place 2

var place2IsReady = true;

In place 1 I need to implement the logic below :

Once place2IsReady value was changed (to true) then display alert('ready!');


  • place2IsReady variable is not available in the scope of place 1.
  • the code from place 1 gets executed before place 2 gets executed (or there is a race condition).

Solution 1

I believe I can use window.place2IsReady instead and use setTimeout/setInterval in place 1 until I get window.place2IsReady === true.

Any better options? Using Listeners? On the variable change?

P.S. I need to track only first possible change of place2IsReady.

Is there a better way? Thank you.

120 thoughts on “Listen to js variable change”

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