What can I do in JavaScript to make each drop down menu only appear after selecting the one before it?

            <div class="row">            
                <div class="col-md-4">
                    <label for="selectCustomers">Customer Select</label>
                        <select class="form-control pointer" name="tableCustomers" id="tableCustomers" style="font-size:100%" >
                            <option id="nothing" value="">---Select---</option>
                            <option  id="1" value="1" >1</option>
                            <option  id="2" value="2">2</option>
                            <option  id="3" value="3">3</option>
                            <option  id="4" value="4">4</option>
                        </select>
                </div>
                <div class="col-md-4">
                    <label for="selectBuilding">Chosen Customer, Building Select</label>
                        <select class="form-control pointer" name="tableCustomers" id="tableCustomers" style="font-size:100%">
                            <option id="nothing" value="">---Select---</option>
                            <option  id="5" value="5" >5</option>
                            <option  id="6" value="6">6</option>
                            <option  id="7" value="7">7</option>
                            <option  id="8" value="8">8</option>
                        </select>
                </div>
                <div class="col-md-4">
                    <label for="selectBattery">Chosen Building, Battery Select</label>
                        <select class="form-control pointer" name="tableCustomers" id="tableCustomers" style="font-size:100%">
                            <option id="nothing" value="">---Select---</option>
                            <option  id="9" value="9" >9</option>
                            <option  id="10" value="10">10</option>
                            <option  id="11" value="11">11</option>
                            <option  id="12" value="12">12</option>
                        </select>
                </div>
            </div>

I want it to only show the first dropdown menu (selectCustomers) when you first load onto the page. After selecting an option other than id="nothing" it will show the next dropdown.

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