Title Rewrite: Unable to react to Sum function

Question

I have enabled the OnClick functionality using JavaScript. But during the final process, i.e. the summation, the code I inserted didn't react.

<div class="modal fade" id="tambahgajiModal" tabindex="-1" role="dialog" aria-labelledby="tambahgajiModal" aria-hidden="true" data-backdrop="static" data -keyboard="false">
<div class="modal-dialog modal-lg">
    <div class="modal-content">
        <div class="modal-header">
            <h5 class="modal-title" id="tambahfungsiModal">Tambah Gaji Karyawan</h5>
            <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                <span aria-hidden="true">×</span>
            </button>
        </div>
        <div class="modal-body">
            <form action="/gaji/insert" method="POST" enctype="multipart/form-data">
                @csrf
                <div class="content">
                    <div class="row">
                        <div class="col-sm-12">
                            <!--on clik on change javascript-->
                            <script type="text/javascript">
                                function golongan() {
                                    var data = document.getElementById("gol").value;
                                    document.getElementById("tunjangan_gol").value = data;
                                }

                                function fungsional() {
                                    var data = document.getElementById("fungsi").value;
                                    document.getElementById("tunjangan_fungsi").value = data;
                                }

                                function struktural() {
                                    var data = document.getElementById("struktur").value;
                                    document.getElementById("tunjangan_struktur").value = data;
                                }

                                function sum() {
                                    var txtFirstNumberValue = document.getElementById('tunjangan_gol').value;
                                    var txtSecondNumberValue = document.getElementById('tunjangan_fungsi').value;
                                    var txtThreeNumberValue = document.getElementById('tunjangan_struktur').value;
                                    var result = parseFloat(txtFirstNumberValue)   parseFloat(txtSecondNumberValue)   parseFloat(txtThreeNumberValue);
                                    if (!isNaN(result)) {
                                        document.getElementById('total').value = result;
                                    }
                                }
                            </script>
                            <div class="form-group">
                                <select name="nama" type="text" class="form-control @error('nama') is-invalid @enderror" value="{{ old('nama') }}">
                                    <option>-- Nama Karyawan --</option>
                                    @foreach ($karyawan as $data)
                                    <option value="{{ $data->nama }}">{{ $data->nama }}</option>
                                    @endforeach
                                </select>
                                <div class="invalid-feedback">
                                    @error('nama')
                                    {{ $message }}
                                    @enderror
                                </div>
                            </div>
                            <div class="form-group">
                                <select name="gol" id="gol" type="text" onclick="golongan()" class="form-control @error('gol') is-invalid @enderror" value="{{ old('gol') }}">
                                    <option>-- Golongan dan M K G --</option>
                                    @foreach ($golongan as $data)
                                    <option value="{{ $data->tunjangan_gol }}">{{ $data->gol }} | {{ $data->mkg }}</option>
                                    @endforeach
                                </select>
                                <div class=" invalid-feedback">
                                    @error('gol')
                                    {{ $message }}
                                    @enderror
                                </div>
                            </div>
                            <div class="form-group">
                                <input name="tunjangan_gol" type="number" id="tunjangan_gol" onclick="sum()" placeholder="Gaji Pokok" class="form-control @error('tunjangan_gol') is-invalid @enderror" value="{{ old('tunjangan_gol') }}" readonly>
                                <div class="invalid-feedback">
                                    @error('tunjangan_gol')
                                    {{ $message }}
                                    @enderror
                                </div>
                            </div>
                            <div class="form-group">
                                <select name="jbt_fungsi" id="fungsi" type="text" onclick="fungsional()" class="form-control @error('jbt_fungsi') is-invalid @enderror" value="{{ old('jbt_fungsi') }}">
                                    <option>-- Jabatan Fungsional --</option>
                                    @foreach ($fungsi as $data)
                                    <option value="{{ $data->tunjangan_fungsi }}">{{ $data->jbt_fungsi }}</option>
                                    @endforeach
                                </select>
                                <div class="invalid-feedback">
                                    @error('gol')
                                    {{ $message }}
                                    @enderror
                                </div>
                            </div>
                            <div class="form-group">
                                <input name="functional_allowance" type="number" id="functional_allowance" onclick="sum()" placeholder="Functional Allowance" class="form-control @error('functional_allowance') is-invalid @enderror" value="{{ old('function_allowance') }}" readonly>
                                <div class="invalid-feedback">
                                    @error('function_allowance')
                                    {{ $message }}
                                    @enderror
                                </div>
                            </div>
                            <div class="form-group">
                                <select name="jbt_structure" id="structure" onclick="structural()" class="form-control @error('jbt_structure') is-invalid @enderror" value="{{ old('jbt_structure') }}">
                                    <option>-- Structural & Functional Position --</option>
                                    @foreach ($structure as $data)
                                    <option value="{{ $data->benefits_structure }}">{{ $data->jbt_structure }} | {{ $data->jbt_function }}</option>
                                    @endforeach
                                </select>
                                <div class="invalid-feedback">
                                    @error('jbt_structure')
                                    {{ $message }}
                                    @enderror
                                </div>
                            </div>
                            <div class="form-group">
                                <input name="structure_allowance" type="number" id="structure_allowance" onclick="sum()" placeholder="Structural_allowance" class="form-control @error('structure_allowance') is-invalid @enderror" value="{{ old('benefits_structure') }}" readonly>
                                <div class="invalid-feedback">
                                    @error('allowance_structure')
                                    {{ $message }}
                                    @enderror
                                </div>
                            </div>
                            <div class="form-group">
                                <input name="total_gaji" type="number" id="total" onclick="sum()" placeholder="Total Salary" class="form-control @error('total_gaji') is-invalid @enderror" value="{{ old('total_salary') }}" readonly>
                                <div class="invalid-feedback">
                                    @error('total_salary')
                                    {{ $message }}
                                    @enderror
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
                    <button type="submit" class="btn btn-primary">Save</button>
                </div>
            </form>
        </div>
    </div>
</div>

Is there anything I missed? I think this is correct, maybe my code insertion is wrong...

Thank you for taking the time to review and answer my questions.

Answer 1

First use the console log to check your value, then also console the sum and then push it to the sum input field. As far as I know your code is fine and works as raw html on my computer. So you might have selected the wrong id, please check.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
</head>
<body>
    <input name="num1" type="number" id="num1" onkeyup="sum()" type="text" placeholder="" class="form-control" value="" />
    <input name="num1" type="number" id="num3" onkeyup="sum()" type="text" placeholder="" class="form-control" value="" />
    <input name="num1" type="number" id="num2" onkeyup="sum()" type="text" placeholder="" class="form-control" value="" />
    <input name="num1" type="number" id="total" onkeyup="sum()" type="text" placeholder="" class="form-control" value="" />

    <script>
        function sum() {
            var txtFirstNumberValue = document.getElementById("num1").value;
            var txtSecondNumberValue = document.getElementById("num2").value;
            var txtThreeNumberValue = document.getElementById("num3").value;
            var result = parseFloat(txtFirstNumberValue) parseFloat(txtSecondNumberValue) parseFloat(txtThreeNumberValue);
            if (!isNaN(result)) {
                document.getElementById("total").value = result;
            }
        }
    </script>
</body>