how to add user define variable with some predefine integer in javascript?

Question

I am trying to add user define number with some predefine integer. But I am getting the wrong output.

I have a user define the variable 'qdt'. suppose the value of qdt is '5000.00'. I want to 2000 in qdt. I need output 7000.00 but I am getting '5000.002000'.

where I am doing wrong with the function? please help.

thank You.

    <script>
            function totalise() {    
            var qtd   = document.getElementById('qt').value;
            var myCheck1 = document.getElementById('myCheck1');
            var myCheck2 = document.getElementById('myCheck2');
            if (myCheck1.checked == true){
            var qtd   = document.getElementById('qt').value;

            qtd = qtd + 2000;

            } else {
                    if (myCheck2.checked == true){
                         var qtd   = document.getElementById('qt').value;

                           qtd = qtd + 500;

                    }else{
                         var qtd   = document.getElementById('qt').value;
                    }
                    var qtd   = document.getElementById('qt').value;
            }
            document.getElementById('result').value = qtd ;
            }
    </script>

Its not a number type, so its just concatenating it, `'5000.00'+'2000'` — Lawrence Cherone, May 28 '19 at 10:00
You can use parseInt to parse a string to a number. To be on the safe side of things, always pass 10 as the second argument to parse in base 10. — Arpit Jain, May 28 '19 at 10:09

score 1 · Accepted Answer · answered May 28 '19 at 10:01

1

You need convert to number before add

var qtd   = document.getElementById('qt').value;

qtd = parseFloat(qtd) + 500;

answered May 28 '19 at 10:01

Hien Nguyen

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how to add user define variable with some predefine integer in javascript?

1 Answers1