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HTML Required屬性用法及代碼示例

HTML Required 屬性是一個布爾屬性,它指定必須在提交表單之前填寫 input 元素。此屬性與以下元素一起使用:

  1. <input>
  2. <select>
  3. <textarea>

<input>

我們可以輕鬆地將 required 屬性與 <input> 元素一起使用,如以下語法所示:

<input required>

示例

<html>
<head>
<title>
Example of required attribute with input element 
</title>
<style>
div
{
padding:10px 0;
}
</style>
<head>
<body>
<form>
<div>
<label>Name</label> 
<input type="text" placeholder="Enter Name" name="name" required> 
</div>
<div> 
<label> E-mail </label> 
<input type="email" placeholder="Enter email ID" name="email" required> 

</div>
<div>
 <label> Mobile No. </label> 
<input type="text" placeholder="Enter Your Mobile No." name="mobileno" required>
</div>

<div>
<label>Password</label> 
<input type="password" placeholder="Enter Password" name="psw" required> 
<br>
  </div> 
<button type="submit" VALUE="SUBMIT"> SUBMIT </button>
</form>
</body>
</html>

輸出:

HTML Required Attribute

<select>

我們可以輕鬆地將 required 屬性與 <select> 元素一起使用,如以下語法所示:

<select required>

示例

<html>
<head>
<title> Example of required attribute with select option </title>
<style>
div
{
padding:10px 0;
}
</style>
<head>
<body>
<form>
<label> 
Course:
</label> 
<select required>
<option value="">None</option>
<option value="BCA">BCA</option>
<option value="BBA">BBA</option>
<option value="B.Tech">B.Tech</option>
<option value="MBA">MBA</option>
<option value="MCA">MCA</option>
<option value="M.Tech">M.Tech</option>
</select>
<button type="submit" VALUE="SUBMIT"> SUBMIT </button>
</form>
</body>
</html>

輸出:

HTML Required Attribute

<textarea>

我們還可以輕鬆地將 required 屬性與 <textarea> 元素一起使用,如以下語法所示:

<textarea required>

示例

<html>
<head>
<title> Example of required attribute with textarea </title>
<style>
div
{
padding:10px 0;
}
</style>
<head>
<body>
<form>
Any Comment:
<br>
<textarea cols="80" rows="5" placeholder="Enter a comment" value="address" required>
</textarea>
<button type="submit" VALUE="SUBMIT"> SUBMIT </button>
</form>
</body>
</html>

輸出:

HTML Required Attribute

瀏覽器支持

Elementchrome browser Chromeie browser IEfirefox browser Firefoxopera browser Operasafari browser Safari
<required>YesYesYesYesYes




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