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HTML 

              
                <div class="fieldset">
	<div class="legend">バリデーションフォーム</div>

	<div class="form-group">
		<div class="form-label"><label class="control-label required">お名前</label></div>
		<div class="form-control">
      <input type="text" name="sei" size="16" placeholder="山田" maxlength="16" value="">
      <input type="text" name="mei" size="16" placeholder="太郎" maxlength="16" value=""></div>
	</div>
  
  <div class="form-group">
		<div class="form-label"><label class="control-label required">電話番号</label></div>
		<div class="form-control"><input type="text" name="tel" size="20" placeholder="0312345678" maxlength="20" value="">
    <p class="help-block">10桁または11桁の数字を入力してください。（ハイフンは必要ありません）</p>
      </div>
    
	</div>
  

	
	<div class="form-group">
		<div class="form-label"><label class="control-label required">郵便番号</label></div>
		<div class="form-control">
			<input type="text" name="zip" size="10" placeholder="1234567" maxlength="10" value="">
			<p class="help-block">7桁の数字を入力してください。（ハイフンは必要ありません）</p>
		</div>
	</div>
!

CSS 

              
                @charset "UTF-8";

/* ----入力フォーム共通---- */

input,
button,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

input[type="text"],
input[type="tel"],
input[type="email"],
input[type="search"],
input[type="password"],
input[type="url"],
input[type="number"],
select,
textarea {
  padding: 4px;
  border: 1px solid #ccc;
  background-color: #fff;
  max-width: 43%;
  margin: 5px;
}

input[type="text"]:hover,
input[type="tel"]:hover,
input[type="email"]:hover,
input[type="search"]:hover,
input[type="password"]:hover,
input[type="url"]:hover,
input[type="number"]:hover,
select:hover,
textarea:hover {
  border: 1px solid #666;
}

input[type="radio"] {
  width: 18px;
  height: 18px;
  vertical-align: middle;
  margin-right: 5px;
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  vertical-align: middle;
  margin-right: 5px;
}

label.radio,
label.checkbox,
input[type="radio"],
input[type="radio"] + label,
input[type="checkbox"],
input[type="checkbox"] + label,
select {
  cursor: pointer;
}

input[type="text"][disabled] {
  background: #dcdcdc;
  cursor: not-allowed;
}

/* ----入力フォームタイトル---- */

.legend {
  margin: 40px 0 20px;
  padding: 0 0 5px 2px;
  font-size: 26px;
  font-weight: normal;
  border-bottom: #999 1px solid;
}

/* ----縦型入力フォーム---- */

.fieldset-vertical {
  margin-top: 10px;
  margin-bottom: 10px;
}

.fieldset-vertical .form-group {
  margin: 5px 0 10px 0;
}

.fieldset-vertical .form-label,
.fieldset-vertical .constraint {
  margin: 0 0 5px 0;
}

.fieldset-vertical .form-label {
  padding: 10px;
  margin-right: 10px;
  text-align: left;
  background: #f9f9f9;
  vertical-align: middle;
}

.fieldset-vertical .form-label label {
  font-weight: bold;
}

.fieldset-vertical .form-control {
  clear: both;
}

/* ----横型入力フォーム---- */

.fieldset {
  margin-top: 10px;
  margin-bottom: 10px;
  width: 100%;
}

.fieldset .form-group {
  display: table;
  width: 100%;
  border-top: #e5e5e5 1px solid;
}

.fieldset .form-group:last-child {
  border-bottom: #e5e5e5 1px solid;
}

.fieldset .form-label,
.fieldset .constraint,
.fieldset .form-control {
  display: table-cell;
}

.fieldset .form-label {
  width: 23%;
  padding: 25px 15px 25px 15px;
  text-align: left;
  background: #f9f9f9;
}

.fieldset .form-label label {
  font-weight: bold;
}

.fieldset .constraint {
  width: 65px;
  padding: 5px;
  background: #f9f9f9;
}

.fieldset .form-control {
  padding: 5px 0 5px 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
}

/* ----入力支援---- */

.form-error {
  display: block;
  color: #a94442;
}

.required:after {
  display: inline-block;
  margin-left: 10px;
  padding: .2em .6em;
  font-size: 11px;
  text-align: center;
  white-space: nowrap;
  vertical-align: top;
  border-radius: .25em;
  color: #fff;
  background-color: #d9534f;
  content: "必須";
}

.help-block {
  display: block;
  width: 100%;
  font-size: 11px;
  margin-top: 5px;
  color: #737373;
}

.count-msg-another {
  display: block;
  font-size: 11px;
  margin-top: 5px;
  color: #555;
}

.count-msg {
  display: block;
  font-size: 11px;
  margin-top: 5px;
  color: #f66;
}

/* ----入力フォームボタン---- */

.action-buttons {
  margin-top: 10px;
  width: 100%;
  text-align: center;
  display: block;
}

.action {
  display: inline;
  margin-left: 10px;
  margin-right: 10px;
}

.action .btn {
  margin-top: 10px;
  padding: 8px 8px;
  font-size: 16px;
  border-bottom-width: 2px;
  min-width: 160px;
}

/* ----ラジオボタン、チェックボックス---- */

.radio {
  margin-right: 10px;
}

.checkbox {
  margin-right: 10px;
}

/* ----EFO---- */
.efo-icon {
  border: none;
  vertical-align: middle;
}

input[type="text"].efo-error,
input[type="tel"].efo-error,
input[type="email"].efo-error,
input[type="search"].efo-error,
input[type="password"].efo-error,
input[type="url"].efo-error,
input[type="number"].efo-error,
select.efo-error,
textarea.efo-error {
  background-color: #f2dede;
}

input[type="text"].efo-valid,
input[type="tel"].efo-valid,
input[type="email"].efo-valid,
input[type="search"].efo-valid,
input[type="password"].efo-valid,
input[type="url"].efo-valid,
input[type="number"].efo-valid,
select.efo-valid,
textarea.efo-valid {
  background-color: #e9f2d7;
}
!

JS 

              
                class Validate {
  constructor() {
    this.isError = false
    this.errorMessage = ""
    this.errorMessageList = [
      "桁数に誤りがあります。",
      "半角数字で入力してください。",
    ]
  }
  // 未入力の判定
  checkEntered(formPartSelf) {
    const _this = this
    formPartSelf.on("keyup focus blur", function (e) {
      const targetElm = $(this)
      const targetValue = e.target.value

      if (e.type == "focus") {
        if (targetValue == "") {
          _this._validateReset(targetElm)
        }
      }

      if (e.type == "blur") {
        if (targetValue == "") {
          _this._validateError(targetElm)
          return
        }
      }

      if (e.type == "keyup") {
        if (targetValue == "") {
          _this._validateReset(targetElm)
          _this._balloonHide(targetElm)
        } else {
          _this._validateNormal(targetElm)
        }
      }
    })
  }
  // 数字の桁数チェック
  checkNumber(formPartSelf, minNum, maxNum) {
    const _this = this
    formPartSelf.on("keyup", function (e) {
      const targetElm = $(this)
      const targetValue = e.target.value

      // 未入力の場合は処理しない
      if (targetValue == "") return

      if (e.type == "keyup") {
        _this.isError = false
        _this._minLength(targetValue, minNum)
        _this._maxLength(targetValue, maxNum)
        _this._isNumber(targetValue)
      }
      _this._judgeShowError(targetElm)
    })
  }

  // 入力数チェック(最大)
  _maxLength(val, num) {
    const targetDigit = val.toString().length
    if (targetDigit > num) {
      this.isError = true
      this.errorMessage = this.errorMessageList[0]
    }
  }
  // 入力数チェック(最小)
  _minLength(val, num) {
    const targetDigit = val.toString().length
    if (targetDigit < num) {
      this.isError = true
      this.errorMessage = this.errorMessageList[0]
    }
  }
  // 数字チェック
  _isNumber(val) {
    if (isNaN(val)) {
      this.isError = true
      this.errorMessage = this.errorMessageList[1]
    }
  }

  // エラー判定
  _judgeShowError(targetElm) {
    if (this.isError) {
      this._validateError(targetElm)
      this._balloonShow(targetElm)
    } else {
      this._validateNormal(targetElm)
      this._balloonHide(targetElm)
    }
  }

  // ツールチップ表示
  _balloonShow(targetElm) {
    console.log(targetElm)
    const _this = this
    // 修正ここから
    if (targetElm?.data("balloon")?.data('active')) {
      targetElm.data("balloon").data('active', false);
    }
    targetElm
      .one("blur", function (e) {
        targetElm.hideBalloon()
      })
      .showBalloon({
        contents: _this.errorMessage,
      })
    // 修正ここまで
    
  }

  // ツールチップ非表示
  _balloonHide(_targetElm) {
    _targetElm.hideBalloon()
  }
  // エラー表示
  _validateError(targetElm) {
    targetElm.removeClass("efo-valid")
    targetElm.addClass("efo-error")
  }
  // 入力OK
  _validateNormal(targetElm) {
    targetElm.removeClass("efo-error")
    targetElm.addClass("efo-valid")
  }
  // 　リセット
  _validateReset(targetElm) {
    targetElm.removeClass("efo-valid")
    targetElm.removeClass("efo-error")
    targetElm.hideBalloon()
  }
}

$(function () {
  // Inputにイベント登録
  $("input").each(function () {
    const formPartSelf = $(this)
    // autocompleteを無効化する
    formPartSelf.attr("autocomplete", "off")

    const validate = new Validate()

    // 未入力の判定
    validate.checkEntered(formPartSelf)

    // 電話番号
    if (formPartSelf.attr("name") == "tel") {
      validate.checkNumber(formPartSelf, 10, 11)
    }
    // 郵便番号
    if (formPartSelf.attr("name") == "zip") {
      validate.checkNumber(formPartSelf, 7, 7)
    }
  })
})
!
999px

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