2022年4月24日 星期日

[研究][HTML5][CSS3]placeholder-shown偽類實現輸入框浮動文字效果

[研究][HTML5][CSS3]浮動標籤 (Floating labels)

[研究][HTML5][CSS3]placeholder-shown偽類實現輸入框浮動文字效果

2022-04-24

HTML5 + CSS3

<head>
<style>
.LoginForm {
            padding: 10px;
            width: 500px;
            border: 4px solid #1199CD;
            margin-right: auto;
            margin-left: auto;
            background-color: #FFF;
            margin-bottom: 30px;
            border-radius: 12px;
            overflow: auto;
        }

.input-group {
  position: relative;
  margin: 20px;
  font-size: 16px;
}

.input-group>input {
  display: block;
  box-sizing: border-box;
  width: 100%;
  padding: 1em;
  font-size: 16px;
  line-height: 1.0;
  border: none; 
  border-bottom: 1px solid #cdcdcd;
  border-radius: 0.4em;
  transition: box-shadow 0.3s;
}

.input-group input::placeholder {
  font-style: italic;
  color: #cdcdcd;
}

.input-group>input:focus {
  outline: none;
  box-shadow: 0.2em 0.8em 1.6em #cdcdcd;
}

.input-group>label {
  position: absolute;
  bottom: 0;
  left: 1em;
  z-index: -1;

  visibility: hidden;
  color: #555555;
  opacity: 0;

  -webkit-transform-origin: 0 0;
  transform-origin: 0 0;
  -webkit-transform: translate3d(0, 0, 0) scale(0);
  transform: translate3d(0, 0, 0) scale(0);
  -webkit-transition:
    opacity 0.3s,
    visibility 0.3s,
    transform 0.3s,
    z-index 0.3s;

  transition:
    opacity 0.3s,
    visibility 0.3s,
    transform 0.3s,
    z-index 0.3s;
}

.input-group>input:focus ~ label {
  z-index: 1;
  visibility: visible;
  opacity: 1;
  -webkit-transform: translate3d(0, -2.4em, 0) scale(1);
  transform: translate3d(0, -2.4em, 0) scale(1);
}
</style>
</head>
<form id="form1" runat="server" class="LoginForm">
<h1 style="text-align:center">管理平台</h1><hr>
<div class="input-group">
  <input type="text" id="username" placeholder="請輸入賬號">
  <label for="username">賬號</label>
</div>
<!-- 密碼 -->
<div class="input-group">
  <input type="text" id="password" placeholder="請輸入6~8位密碼">
  <label for="password">密碼</label>
</div>

<div class="input-group">
  <input type="text" id="password" placeholder="驗證碼">
  <label style="z-index: 1;
  visibility: visible;
  opacity: 1;
  -webkit-transform: translate3d(0, -2.4em, 0) scale(1);
  transform: translate3d(0, -2.4em, 0) scale(1);" for="password">驗證碼</label>
</div>
<div class="input-group">
  <input type="submit" value="登入">
</div>
</form>

(完)



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