Nan is comming on the second add function

Question

1.00/5 (1 vote)

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<html>
  <head>
        <title>Add program</title>
        <script language='javascript'>
                function addNumbers()
                {
                        var val1 = parseInt(document.getElementById('value1').value);
                        var val2 = parseInt(document.getElementById('value2').value);
                        var ans = document.getElementById('answer');
                        ans.value = val1 + val2;

                        
                }
        </script>
  </head>
  <body>
        value 1 = <input type='text' id='value1' name='value1' value=''/>
        <br>
        <br>
        value 2 = <input type='text' id='value2' name='value2' value=''/>
        <br>
        <br>
        <input type='button' name='Sumbmit' value='ADD' onclick='javascript:addNumbers()'/>
        <br>
        <br>
        Answer = <input type='text' id='answer' name='answer' value=''/>
        <br>
        <br>
  </body>
  <script  language='javascript'>
      function addNumbers()
  

  function addNumbers()
                        {

                        var val3 = parseInt(document.getElementById('value3').value);
                        var val4 = parseInt(document.getElementById('value4').value);
                        var ans = document.getElementById('answer');
                        ans.value = val3 + val4;
                        }
                        </script>


<body>
    Value 3 =<input type='text' id='value3' name='value3' value=''/>
    <br>
    <br>
    Value 4 =<input type='text' id='value4' name='value4' value=''/>
    <br>
    <br>
    <input type='button' name='Sumbmit' value='ADD' onclick='javascript:addNumbers()'/>
    <br>
    <br>
    </body>



</html>

What I have tried:

changing the double quotations into single quotations

Posted 12-Jan-20 18:48pm

Member 14714436

Updated 12-Jan-20 19:42pm

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kp564 · Answer 1 · 2020-01-12T19:43:00

Hi,

Please replace you function

JavaScript

function addNumbers()
                {
                        var val1 = parseInt(document.getElementById('value1').value);
                        var val2 = parseInt(document.getElementById('value2').value);
                        var ans = document.getElementById('answer');
                        ans.value = val1 + val2;

                        
                }

With the below code.

JavaScript

function addNumbers()
{
        var val1 = parseInt(document.getElementById('value1').value);
        var val2 = parseInt(document.getElementById('value2').value);
        var ans = document.getElementById('answer');
        if(isNaN(val1))
        {
        val1=0;
        }
        if(isNaN(val2))
        {
        val2=0;
        }
        ans.value = val1 + val2;


}

Also change the second method "addNumbers" to AddNumber2() or relevant to you naming convention.

Also check the NaN value using isNaN method of JavaScript in second function.

As you can not have the same name for two different functionalities.
And will always call the first method as you have given same name to both method.

Hope this will help you.