How Do I Call Two Function On Enter Key Event

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Javascript

dear sir,

I just want to call to function on enter key event first function is to add row and second function is calculate value and pass to the textbox.

my code

<script>
function addRow(myfield1,e)
 {
        var keycode;
        if (window.event) keycode = window.event.keyCode;
        else if (e) keycode = e.which;
        else return true;
        var pname = document.getElementById("pname").value;
        var unit = document.getElementById("unit").value;
        var Weight = document.getElementById("Weight").value;       
      
        if (keycode == 13)
        {

        if(rate==""||amount=="")
        {
            alert("Enter The Fileds");
        }
        else
        {
        //debugger;
            var tble1 = document.getElementById('mytab1');
            var Count1 = tble1.rows.length;
            var row1 = tble1.insertRow(Count1-1);
            var rowno1=Count1-1;
            //alert(Count1);

            var val0 = row1.insertCell(0);  //delete
            //val0.align='center';
            val0.innerHTML = "<a href='#' onclick='deletethisrow(this);'><img src='images/Delete.png'/></a>";

            var val1 = row1.insertCell(1);  //auto increment no.
            val1.align='center';
            val1.innerHTML = (rowno1);

            var val2 = row1.insertCell(2);  //pname
            //val2.align='center';
            var element2 = document.createElement("input");
            element2.type = "text";
            element2.name = "txtbox2[][element2]";
            element2.style="width:130px";
            element2.value= pname;
            val2.appendChild(element2);
            document.getElementById("pname").value='';

            var val3 = row1.insertCell(3);  //unit
            //val2.align='center';
            var element3 = document.createElement("input");
            element3.type = "text";
            element3.name = "txtbox2[][element3]";
            element3.style="width:70px";
            element3.value= unit;
            val3.appendChild(element3);
            document.getElementById("unit").value='';

            var val4 = row1.insertCell(4);  //Weight
            //val2.align='center';
            var element4 = document.createElement("input");
            element4.type = "text";
            element4.name = "txtbox2[][element4]";
            element4.style="width:100px";
            element4.value= Weight;
            val4.appendChild(element4);
            document.getElementById("Weight").value='';

            var val8 = row1.insertCell(8);  //item
            //val2.align='center';
            var element8 = document.createElement("input");
            element8.type = "text";
            element8.name = "txtbox2[][element8]";
            element8.style="width:70px";
            element8.value= document.getElementById("item").value;
            val8.appendChild(element8);
            document.getElementById("item").value='';


            claval();
         return false;
        }

        }
        else
            {
            return true;
            }
}
</script>
<script>

function claval()
{
debugger;
var it=document.getElementById('item').value;
if(it=='10 kg')
{
var g=document.getElementById('10kg').value;
alert(g);
alert(qty);
var sm=parseFloat(g)+parseFloat(qty);
document.getElementById('10kg').value=sm.toFixed(2);
}
else
if(it=='5 kg')
{
var g=document.getElementById('5kg').value;
var sm=parseFloat(g)+parseFloat(qty);
document.getElementById('5kg').value=sm.toFixed(2);
}
else
if(it=='BOX')
{
var g=document.getElementById('BOX1').value;
var sm=parseFloat(g)+parseFloat(qty);
document.getElementById('BOX1').value=sm.toFixed(2);
}
else
if(it=='30 kg')
{
var g=document.getElementById('30kg').value;
var sm=parseFloat(g)+parseFloat(qty);
document.getElementById('30kg').value=sm.toFixed(2);
}
}
</script>

</script

>
In above code function calval get null value in var it.so how to get value from previous on enter press