html - How to multiple (a*b) two input text value and show it Dynamicly with text change in javascript? -

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i want show money customer must pay , inputs : 

<input type="text" class="form-control" placeholder="cost " id="txt" name="credit">  <input type="text" class="form-control" placeholder="quantity" id="txt" name="limit">

when input text changing want show total cost (quantity*cost) in <p> tag dynamicly how can javascript?

all of above generate errors if both boxes blank . try code , tested , running . 

<script>  function calc() {     var credit = document.getelementbyid("credit").value;      var limit = document.getelementbyid("limit").value;       if(credit == '' && limit != '')     {         document.getelementbyid("cost").innerhtml = parseint(limit);     }     else if(limit == '' && credit != '')     {         document.getelementbyid("cost").innerhtml = parseint(credit);     }     else if(limit!= '' && credit!= '')     {         document.getelementbyid("cost").innerhtml = parseint(limit) * parseint(credit);     }     else     {         document.getelementbyid("cost").innerhtml = '';     } }  </script>  </head>  

<input type="number" value="0" min="0"  class="form-control" placeholder="cost" id="credit" name="credit" onkeyup="calc();">  <input type="number" value="0" min="0"  class="form-control" placeholder="quantity" id="limit" name="limit" onkeyup="calc();">   <p id="cost"></p>


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