javascript - Variable returns undefined within a jquery function -


this question has answer here:

 $(document).ready(function() {   var modelnumber = false;   var description = false;    $('#step-two-btn').click(function(e) {     e.preventdefault();      modelnumber = $("#model-number-field").val();     description = $("#description-field").val();      alert(modelnumber); //undefined     alert(description); //undefined   });  });

can tell me why following variables returning undefined? have defined global variables jquery not seem recognize them.

this seems working expected when set html 

 $(document).ready(function() {      var modelnumber = false;    var description = false;        $('#step-two-btn').click(function(e) {      e.preventdefault();      modelnumber = $("#model-number-field").val();      description = $("#description-field").val();      alert(modelnumber); //undefined      alert(description); //undefined    });  });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <input type="text" id="model-number-field">  <input type="text" id="description-field">  <button id="step-two-btn">click</button>


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