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Home form - floating labels
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form - floating labels

By yeojin
Posted 2022-08-15 Updated 2024-01-26 12 min read

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html

test page

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<div class="c-form">
    <!-- 기본 -->
    <div class="c-form__field">
        <label class="c-form__label" for="form-1">default</label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-1">
        </div>
    </div>

    <!-- has-focus -->
    <div class="c-form__field has-focus">
        <label class="c-form__label" for="form-2">has-focus</label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-2" value="has-focus">
        </div>
    </div>

    <!-- has-value -->
    <div class="c-form__field has-value">
        <label class="c-form__label" for="form-3">has-value</label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-3" value="has-value">
        </div>
    </div>

    <!-- has-error -->
    <div class="c-form__field has-error has-value">
        <label class="c-form__label" for="form-4">has-error</label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-4" value="has-error">
        </div>
    </div>

    <!-- is-disabled -->
    <div class="c-form__field is-disabled">
        <label class="c-form__label" for="form-5">is-disabled</label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-5" value="is-disabled" disabled>
        </div>
    </div>

    <!-- 에러메시지 -->
    <div class="c-form__field has-focus has-error">
        <label class="c-form__label" for="form-5">에러메세지</label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-5" aria-invalid="true" aria-describedby="error-message" value="에러">
        </div>
    </div>
    <p class="message-error" id="error-message">에러메세지가 출력됩니다.</p>

    <!-- 기본 + 필수입력 -->
    <div class="c-form__field">
        <label class="c-form__label" for="form-6">이름 <span class="sr-only">필수입력</span><span class="require" aria-hidden="true">*</span></label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-6" placeholder="이름 입력">
        </div>
    </div>
    <div class="c-form__field has-focus">
        <label class="c-form__label" for="form-6">이름 <span class="sr-only">필수입력</span><span class="require" aria-hidden="true">*</span></label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-6" placeholder="이름 입력">
        </div>
    </div>

    <!-- password -->
    <div class="c-form__field">
        <label class="c-form__label" for="form-13">password</label>
        <div class="c-form__row">
            <input type="password" class="o-input o-input--text" id="form-13" placeholder="8자~15자 영문/숫자/특수기호조합" maxlength="15">
        </div>
    </div>
    <div class="c-form__field has-focus">
        <label class="c-form__label" for="form-14">password</label>
        <div class="c-form__row">
            <input type="password" class="o-input o-input--text" id="form-14" placeholder="8자~15자 영문/숫자/특수기호조합" maxlength="15">
        </div>
    </div>

    <!-- 기본 + 텍스트 -->
    <div class="c-form__field">
        <label class="c-form__label" for="form-7">금액</label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-7" placeholder="금액 입력" pattern="[0-9]*">
            <span class="c-form__text">원</span>
        </div>
    </div>
    <div class="c-form__field has-focus">
        <label class="c-form__label" for="form-8">금액</label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-8" placeholder="금액 입력" pattern="[0-9]*">
            <span class="c-form__text">원</span>
        </div>
    </div>

    <!-- date -->
    <div class="c-form__field">
        <label class="c-form__label" for="form-19">date</label>
        <div class="c-form__row c-form__row--gutter">
            <input type="date" class="o-input o-input--date" title="시작일" id="form-19">
            <input type="date" class="o-input o-input--date" title="종료일">
        </div>
    </div>
    <div class="c-form__field has-focus">
        <label class="c-form__label" for="form-20">date</label>
        <div class="c-form__row c-form__row--gutter">
            <input type="date" class="o-input o-input--date" title="시작일" id="form-20">
            <input type="date" class="o-input o-input--date" title="종료일">
        </div>
    </div>

    <!-- textarea -->
    <div class="c-form__field">
        <label class="c-form__label" for="form-21">textarea</label>
        <div class="c-form__row">
            <textarea class="o-input o-input--textarea c-form__textarea" id="form-21" placeholder="댓글을 입력하세요." title="댓글" cols="5" rows="10" maxlength="300"></textarea>
        </div>
    </div>
    <div class="c-form__field has-focus">
        <label class="c-form__label" for="form-22">textarea</label>
        <div class="c-form__row">
            <textarea class="o-input o-input--textarea c-form__textarea" id="form-22" placeholder="댓글을 입력하세요." title="댓글" cols="5" rows="10" maxlength="300"></textarea>
        </div>
    </div>

    <!-- 한줄에 들어가는 요소가 한개 이상인 경우 -->
    <div class="c-form__field">
        <label class="c-form__label" for="form-9">생년월일</label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-9" readonly value="1988년" title="년">
            <input type="text" class="o-input o-input--text" readonly value="09월" title="월">
            <input type="text" class="o-input o-input--text" readonly value="24일" title="일">
        </div>
    </div>
    <div class="c-form__field has-focus">
        <label class="c-form__label" for="form-10">생년월일</label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-10" readonly value="1988년" title="년">
            <input type="text" class="o-input o-input--text" readonly value="09월" title="월">
            <input type="text" class="o-input o-input--text" readonly value="24일" title="일">
        </div>
    </div>

    <!-- 여러줄인 경우 + 한줄에 들어가는 요소가 한개 이상인 경우 (row 태그가 추가됨) -->
    <div class="c-form__field">
        <label class="c-form__label" for="form-11">이메일</label>
        <div class="c-form__row">
            <select class="o-input o-input--select" id="form-11" title="도메인">
                <option>직접입력</option>
                <option>naver.com</option>
            </select>
        </div>
        <!-- 도메인 선택 시, 활성화시 display: none 제거 -->
        <div class="c-form__row" style="display: none">
            <input type="email" class="o-input o-input--text" title="이메일 아이디">
            <span class="c-form__text">@gmail.com</span>
        </div>
        <!-- 직접입력 선택 시, 활성화시 display: none 제거 -->
        <div class="c-form__row" style="display: none">
            <input type="email" class="o-input o-input--text" title="이메일 주소">
        </div>
    </div>
    <div class="c-form__field has-focus">
        <label class="c-form__label" for="form-12">이메일</label>
        <div class="c-form__row">
            <select class="o-input o-input--select" id="form-12" title="도메인">
                <option>직접입력</option>
                <option>naver.com</option>
            </select>
        </div>
        <!-- 도메인 선택 시, 활성화시 display: none 제거 -->
        <div class="c-form__row">
            <input type="email" class="o-input o-input--text" title="이메일 아이디" placeholder="메일ID 입력">
            <span class="c-form__text">@gmail.com</span>
        </div>
        <!-- 직접입력 선택 시, 활성화시 display: none 제거 -->
        <div class="c-form__row">
            <input type="email" class="o-input o-input--text" title="이메일 주소" placeholder="메일주소 입력">
        </div>
    </div>

    <!-- input + button  -->
    <div class="c-form__field">
        <label class="c-form__label" for="form-15">아이디</label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-15" placeholder="아이디 입력">
            <button type="button" class="button button--gray button--1x c-form__button">중복확인</button>
        </div>
    </div>
    <div class="c-form__field has-focus">
        <label class="c-form__label" for="form-16">아이디</label>
        <div class="c-form__row">
            <input type="text" class="o-input o-input--text" id="form-16" placeholder="아이디 입력">
            <button type="button" class="button button--gray button--1x c-form__button">중복확인</button>
        </div>
    </div>

    <!-- select + input -->
    <div class="c-form__field">
        <label class="c-form__label" for="form-17">휴대폰 번호</label>
        <div class="c-form__row">
           <select class="o-input o-input--select" id="form-17" title="통신사">
                <option>통신사 선택</option>
                <option>SKT</option>
                <option>KT</option>
                <option>U+</option>
            </select>
           <input type="tel"  class="o-input o-input--text" title="휴대폰 번호" maxlength="11" placeholder="'-' 없이 입력" pattern="[0-9]*">
        </div>
    </div>
    <div class="c-form__field has-focus">
        <label class="c-form__label" for="form-18">휴대폰 번호</label>
        <div class="c-form__row">
           <select class="o-input o-input--select" id="form-18" title="통신사">
                <option>통신사 선택</option>
                <option>SKT</option>
                <option>KT</option>
                <option>U+</option>
            </select>
          <input type="tel"  class="o-input o-input--text" title="휴대폰 번호" maxlength="11" placeholder="'-' 없이 입력" pattern="[0-9]*">
        </div>
    </div>
</div>

script

  • c-form__field 에 상태에 따라 클래스 추가 필요
    • has-focus : 내부에 포커스가 들어가 있는 경우
    • has-value : value 값이 있는 경우
    • has-error : 에러가 있는 경우
    • is-disabled : disabled 상태인 경우

기타

  • script로 .has-focus 클래스를 추가하는 방법 대신 :focus-within css 속성을 사용하는 방법이 있음
  • 관련 포스팅 : :focus-within

css 

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/*---------------------------------------------
  Form
 ----------------------------------------------*/
.o-input {
  $root : ".o-input";

  border: 0;
  border-radius: 0;
  background-color: transparent;
  vertical-align: middle;
  color: #222;
  -webkit-appearance: none;
  appearance: none;
  -webkit-transition: border 200ms ease-in-out;
  transition: border 200ms ease-in-out;

  &::-webkit-input-placeholder,
  &:-ms-input-placeholder,
  &::-moz-placeholder {
    color: #767676;
  }

  &::-ms-clear {
    display: none;
  }

  &:-webkit-autofill,
  &:-webkit-autofill:focus {
    border-color: #d8d8d8;
    -webkit-text-fill-color: #000;
    -webkit-box-shadow: 0 0 0 1000px #fff inset;
    transition: background-color 5000s ease-in-out 0s;
  }

  &--text,
  &--date {
    display: inline-block;
    width: 100%;
    height: 48px;
    padding: 0 20px;
    border: 1px solid #d8d8d8;
    border-radius: 6px;
    background-color: #fff;
    font-weight: 600;
    font-size: 17px;
    text-align: left;

    &[aria-placeholder] {
      color: #666;
    }

    &[readonly],
    &:disabled {
      background-color: #f8f8f8;
      cursor: default;
    }

    &:focus {
      border-color: #0076c0;
    }
  }

  &--text {
    &::-webkit-search-cancel-button {
      display: none;
    }

    &[type="number"]::-webkit-inner-spin-button {
      display: none;
    }
  }

  &--textarea {
    display: block;
    width: 100%;
    height: 132px;
    padding: 18px 20px;
    border: 1px solid #d8d8d8;
    border-radius: 6px;
    background-color: #f8f8f8;
    font-weight: 600;
    font-size: 17px;
    line-height: 21px;
    color : #666;
    resize: none;
  }

  &--select {
    display: inline-block;
    position: relative;
    overflow: hidden;
    width: 100%;
    height: 48px;
    padding: 0 20px;
    border: 1px solid #d8d8d8;
    border-radius: 6px;
    background: #fff url("../img/com/bg_select.png") no-repeat right 20px top 50%;
    background-size: 10px auto;
    font-size: 17px;
    font-weight: 600;
    color: #222;
    text-align: left;
    text-overflow: ellipsis;
    white-space: nowrap;

    &:disabled,
    &.is-disabled {
      background-color: #f8f8f8;
      cursor: default;
    }

    &:focus {
      border-color: #0076c0;
    }

    &.is-disabled:focus {
      border-color: #ccc;
    }
  }
}

.c-form {
  $root : ".c-form";

  margin-top: 25px;

  &__field {
    position: relative;
    padding: 0 20px;
    background-color: #fff;
    border: 1px solid #d8d8d8;
    border-radius: 6px;

    &:nth-child(n+2) {
      margin-top: 10px;
    }
  }

  &__label {
    position: absolute;
    top: 50%;
    left: 20px;
    font-size: 17px;
    color: #666;
    transform: translateY(-50%);
    transition: all 100ms;
  }

  &__row {
    display: flex;
    font-size: 0;

    #{$root}__label + & {
      #{$root}__text,
      .o-input {
        height: 64px;
        padding-top: 22px;
      }
    }

    & + & {
      border-top: 1px solid #eee;
    }

    & > *:nth-child(n+2) {
      display: none;
      margin-left: 10px;
    }
  }

  &__auto {
    flex: none !important;
  }

  &__text {
    flex: none !important;
    font-size: 17px;
    line-height: 42px;
    color: #000;
  }

  .o-input--text,
  .o-input--date,
  .o-input--textarea {
    padding: 0;
    border: none;
    background-color: transparent;
  }

  .o-input--date {
    line-height: 42px;

    & + #{$root}__text {
      margin: 0 10px 0 20px;
    }
  }

  .o-input--text {
    height: 42px;
    background-color: transparent !important;
  }

  .o-input--select {
    height: 42px;
    padding: 0;
    border: none;
    background-color: transparent;
    background-position: right 0 top 50%;
  }

  .o-input--text,
  .o-input--date,
  .o-input--textarea,
  .o-input--select {
    color: transparent;

    &::-webkit-input-placeholder {
      color: transparent;
    }

    &:-ms-input-placeholder {
      color: transparent;
    }

    &::-moz-placeholder {
      color: transparent;
    }
  }

  // 상태
  &__field {
    &.has-focus, // :focus-within
    &.has-value,
    &.has-value.is-disabled {
      #{$root}__row {
        & > * {
          display: block;
          flex: 1;
        }
      }

      #{$root}__label {
        top: 0;
        font-size: 13px;
        transform: translateY(10px);
      }

      #{$root}__label + #{$root}__row {
        .o-input--date,
        .o-input--select {
          background-position: right 0 top 40px;
        }
      }

      .o-input {
        color: #000;

        &::-webkit-input-placeholder {
          color: #666;
        }

        &:-ms-input-placeholder {
          color: #666;
        }

        &::-moz-placeholder {
          color: #666;
        }
      }

      .o-input--textarea {
        height: 108px;
        margin-top: 40px;
        padding-top: 0;
        font-size: 17px;
        line-height: 24px;
      }
    }

    &.has-focus { // :focus-within
      border-color: #0076c0;

      #{$root}__label {
        color: #0076c0;
      }
    }

    &.has-error {
      border-color: #ff3c50;

      #{$root}__label {
        color: #ff3c50;
      }
    }

    &.is-disabled {
      background-color: #f8f8f8;
    }
  }
}

/*---------------------------------------------
  기타
 ----------------------------------------------*/
// 에러 메시지
.message-error {
  display: block;
  width: 100%;
  margin-top: 9px;
  font-size: 15px;
  color: #ff3c50;
}

// 필수입력
.require {
  color: #ff3c50;
}
html
html component
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