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HTML 

              
                <div class="container">
  <div class="row">
    <div class="col-lg-12">
      <div class="card">
        <div class="card-header">
          <h2 class="text-center">Input based on select</h2>
        </div>
        <div class="card-body">
          <p class="lead text-center">Example of a select form with an input appearing based on the
            selection.</p>
          <p class="text-center">Change the select input below to see the changes</p>
          <form id="submit-form" method="post" action="" role="form">
            <div class="row">
              <div class="col-md-12">
                <div class="form-group">
                  <label for="player_type">Find players by:</label>
                  <select id="player_type" name="player_type" class="form-control">
                    <option value="team">Team</option>
                    <option value="experience">Experience</option>
                    <option value="age">Age</option>
                    <option value="surname">Surname beginning with:</option>
                    <option value="all" selected>All</option>
                  </select>
                </div>
              </div>
            </div>
            <div class="row">
              <div class="col-md-12">
                <div class="form-group">
                  <div id="experiance">
                    <select id="exp" name="exp" class="form-control">
                      <option value="1">1 Year</option>
                      <option value="2">2-3 Years</option>
                      <option value="3">3-5 Years</option>
                      <option value="4">6+ Years</option>
                    </select>
                  </div>
                  <div id="teams">
                    <select id="team" name="team" class="form-control">
                      <option value="1">Rangers</option>
                      <option value="2">Blazers</option>
                      <option value="3">Mystics</option>
                      <option value="4">United</option>
                      <option value="5">Power</option>
                      <option value="6">Kings</option>
                    </select>
                  </div>
                  <div id="ages">
                    <select id="age" name="age" class="form-control">
                      <option value="1">18-20</option>
                      <option value="2">20-25</option>
                      <option value="3">25-28</option>
                      <option value="4">28+</option>
                    </select>
                  </div>
                  <div id="surname">
                    <input type='text' class='form-control' id='surname' maxlength='1' minlength='1' value='H'>
                  </div>
                </div>
              </div>
            </div>
            <div class="row">
              <div class="col-12 text-center">
                <input type="submit" class="btn btn-success btn-send" value="Search">
              </div>
            </div>
          </form>
        </div>
      </div>
    </div>
  </div>
</div>
!

CSS 

              
                body {
  background-color: #c3e775;
}

.card-body {
  -ms-flex: 1 1 auto;
  flex: 1 1 auto;
  padding: 1.25rem 1.25rem 0.5rem 1.25rem;
}

.card {
  background-color: #9af5a8;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.12), 0 3px 6px rgba(0, 0, 0, 0.2);
}

.card:hover {
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.24);
}

.card-header {
  background-color: #a3f4dd;
  border-bottom: 1px solid rgb(91, 186, 255);
}

.btn-success {
  color: #464646;
  background-color: #b9deff;
  border-color: #566bdc;
  padding: 0.6rem 8rem;
  transition: ease-in-out 0.5s;
}

.btn-success:hover {
  color: #fff;
  background-color: #96bcdf;
  border-color: #507ba0;
}

.form-control {
  padding: 0.375rem 0.75rem;
  color: #fff;
  background-color: #89bbca;
  border: 1px solid #95aae9;
  border-radius: 0.45rem;
}

.form-control:focus {
  color: #495057;
  background-color: #c9d6f6;
  border-color: #8e93e5;
  outline: 0;
  box-shadow: 0 0 0 0.2rem rgba(0, 4, 255, 0.15);
}

::-webkit-input-placeholder {
  /* WebKit, Blink, Edge */
  color: #d7eeff !important;
}

:-moz-placeholder {
  color: #d7eeff !important;
  opacity: 1;
}

::-moz-placeholder {
  color: #d7eeff !important;
  opacity: 1;
}

::placeholder {
  color: #d7eeff;
}
!

JS 

              
                $(document).ready(function () {
  toggleFields();
  $("#player_type").change(function () {
    toggleFields();
  });
});

function toggleFields() {
  if ($("#player_type").val() === "experience") {
    $("#experiance").show();
  } else {
    $("#experiance").hide();
  }
  if ($("#player_type").val() === "team") {
    $("#teams").show();
  } else {
    $("#teams").hide();
  }
  if ($("#player_type").val() === "age") {
    $("#ages").show();
  } else {
    $("#ages").hide();
  }
    if ($("#player_type").val() === "surname") {
    $("#surname").show();
  } else {
    $("#surname").hide();
  }
}
!
999px

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