gistfile1.txt

This illustrates the problem better:

          something_that_will_insert_element_in_page()

          console.log('length:::');
          console.log($('#calc_historical_field').length);   // 0

          (function () {
            console.log('length::::');
            console.log($('#calc_historical_field').length); // 1
          }).defer(1000)




  ...binding a calc line...
    before
      <<< line
        _id: 'BMI', 
        display_name: 'Body Mass Index',
        line_type: 'calc',
        calc_historic: '[Weight] / 5',
      >>> transforms: 'line'
    ^
    before_each  
      bind(@line)
      
    ... binds `_id`
        area.should.have_input 'calc_id', 'BMI'    
    ... binds `display_name`
        area.should.have_input 'calc_display_name', 'Body Mass Index'
        
    ...builds calc input fields for columns...
      before
      ... asks for the current sheet columns
          area.should.have_input 'calc_historical'
          for (var i = 0; i < 10000000; i++) { i++; i--; i += 0}
          console.log($('#calc_historical_field').length);
      ^