HTML DOM Input Email maxLength 属性

htmlweb developmentfront end technology更新于 2025/6/26 4:28:17

HTML DOM Input Email maxLength 属性返回/设置输入电子邮件的 maxLength 属性。如果未定义，此属性返回"-1"。

语法

以下是语法 −

返回 maxLength 属性

inputEmailObject.maxLength

将 maxLength 属性设置为 number

inputEmailObject.maxLength = number

示例

让我们看一个 Input Email maxLength 属性的示例 −

<!DOCTYPE html>
<html>
<head>
<title>Input Email maxLength</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 id="Multitech-MNC">
<fieldset>
<legend>Email-maxLength</legend>
<label for="EmailSelect">Employee Email :
<input type="email" id="EmailSelect" placeholder="jkl@qwerty.com" maxLength="10">
</label>
<input type="button" onclick="logIN()" value="Log In">
<input type="button" onclick="changeMaxLength()" value="Change Maxlength">
<div id="divDisplay"></div>
</fieldset>
</form>
<script>
   var divDisplay = document.getElementById("divDisplay");
   var inputEmail = document.getElementById("EmailSelect");
   divDisplay.textContent = 'Maxlength: '+inputEmail.maxLength;
   function changeMaxLength() {
      inputEmail.maxLength += 5;
      divDisplay.textContent = 'Maxlength: '+inputEmail.maxLength;
   }
   function logIN(){
      if(inputEmail.value !== '')
         divDisplay.textContent = 'Logging Into: '+inputEmail.form.id;
      else
         divDisplay.textContent = 'Please enter valid email';
   }
</script>
</body>
</html>