HTML DOM 輸入 Email placeholder 屬性

HTML DOM Input Email placeholder 屬性設定/返回一字串，通常用於向用戶提示輸入文字的外觀。

語法

以下是語法 −

返回字串值

inputEmailObject.placeholder

設定placeholder為 stringValue

inputEmailObject.placeholder = stringValue

示例

讓我們看一個輸入電子郵件 placeholder 的示例 −

<!DOCTYPE html>
<html>
<head>
<title>Input Email placeholder</title>
<style>
   form {
      width:70%;
      margin: 0 auto;
      text-align: center;
   }
   * {
      padding: 2px;
      margin:5px;
   }
   input[type="button"] {
      border-radius: 10px;
   }
</style>
</head>
<body>
<form>
<fieldset>
<legend>Email-placeholder</legend>
<label for="EmailSelect">Employee ID :
<input type="email" id="EmailSelect">
</label>
<input type="button" value="What details should be entered?" onclick="setPlaceholder()">
<div id="divDisplay"></div>
</fieldset>
</form>
<script>
   var divDisplay = document.getElementById("divDisplay");
   var inputEmail = document.getElementById("EmailSelect");
   function setPlaceholder() {
      inputEmail.placeholder = 'Name-ID@MNC.com';
      divDisplay.textContent = inputEmail.placeholder+' --> Replace Name & ID by details provided.';
   }
</script>
</body>
</html>