Nightwatch returns 'null' back to runner before my .execute() block finishes

[Eric Mumford]

As a test running remote javascript execution and wanting to parse the boolean value returned, I am always returning null, instead of waiting for the javascript execution to finish and return a true/false. 

My question is twofold: Why is this working this way, and what do I need to learn to have my test wait for the execution to return a value? 

Presently, if I run my execute code in the console of a browser on the page in question, it works (returns true/false). 

When I run my test through nightwatch, I can see my remote console.log debug statements logging a correct callback, but the callback happens after Nightwatch has already returned a null back to the runner.

The sanitized code takes the following form (note I've removed uninteresting logic chunks not related to my question):

browser

 .api.execute(function(day) { // The following sanitized code does run correctly in the console

  var sessions = document.querySelectorAll('.itemlst');

  var clickFirstInstanceOfDay = function (d,callback) {

   for (var i=0,found=false;i<sessions.length && found==false;i++) { 

    if (sessions[i].innerText.toString().indexOf(d)>-1) {

       callback((containsCheckBeforeClick != containsCheckAfterClick));

    }

   }

  }

  clickFirstInstanceOfDay('Tuesday', function(bool){

   console.log('>> clickFirstInstanceOfDay(callback): returning value ',bool);

   return bool; // This verifies the right value is being returned

  });

      }, ['Tuesday'], function(res) { // This will always output null

     console.log("<< NW test scope: The response back from the remote toggle check is ",res.value);

        

Any ideas? Do I really need to use promises instead of callbacks? Is there a Nightwatch library method I can employ to say "Hey do this and wait for a response"?

[David Linse]

Did you tried the `async` variant of `.execute` .. ?
http://nightwatchjs.org/api/executeAsync.html

regards

~david

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