$(document).ready(function() {
 
  $('#mydropdown').change(function() {
    var selectedOption = $(this).val();
    var x = 'my_trigger_value';

    if (selectedOption === x) {
      dosomething();
    }
  });

 
  $('#my_trigger_value').change(function() {
    var isChecked = $(this).is(':checked');

    if (isChecked) {
      dosomething();
    }
  });

  // Function to be called
  function dosomething() {
    
    console.log("Condition met (through dropdown OR through checkbox)!");
  }
});

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