Kode HTML

<section class="content">
  <div class="row">
    <div class="col-md-6">
       <div class="box box-primary">
            <div class="box-header with-border">
              <h3 class="box-title">Masuka Data Barang</h3>
              <hr>
              <form>
                  <div class="form-group">
                    <label>Jenis Barang</label>
                    <?php
                     $style=array('class'=>'form-control','name'=>'id_kategori_barang') ;
                     echo form_dropdown('kategori',$kategori,'',$style);?>
                  </div>

                  <div class="form-group">
                    <label>Nama Barang</label>
                    <input type="text" class="form-control" name="nama_barang" placeholder="Nama Barang">
                  </div>

                  <div class="form-group">
                    <label>Harga Jual</label>
                    <input type="text" class="form-control" id="harga_jual" name="harga_jual" placeholder="Rp.">
                  </div>

                  <div class="form-group">
                    <label>Harga Laba</label>
                    <input type="text" class="form-control" autocomplete="off" id="harga_laba" name="harga_laba" placeholder="Rp.">
                  </div>

                  <div class="form-group">
                    <label>Jumlah Barang</label>
                    <input type="number" class="form-control" onchange="total_harga(this.value)"
                  onkeyup="total_harga(this.value)" autocomplete="off"  id="jumlah_barang" name="jumlah_barang" placeholder="Jumlah Barang">
                  </div>

                  <div class="form-group">
                    <label>Stok Barang</label>
                    <input type="number" class="form-control" name="stok_barang" placeholder="Stok Barang">
                  </div>

                  <div class="form-group">
                    <label for="total_harga">Total Harga Barang</label>
                    <input type="text" class="form-control" id="total_harga" name="total_harga" readonly="readonly">
                  </div>

                  <div class="form-group">
                    <button type="submit" class="btn btn-primary">Simpan</button>
                    <button type="reset" class="btn btn-danger">Ulangi</button>
                  </div>
            </div>
        </div>
    </div>
    <div class="col-md-6">
       <div class="box box-primary">
            <div class="box-header with-border">
              <h3 class="box-title">Tampil Data Barang</h3>

            </div>
        </div>
    </div>
</div>
</section>