HTML required属性

HTML Required属性是一个布尔属性, 它指定在提交表单之前必须填写输入元素。该属性与以下元素一起使用:

  1. < input>
  2. < select>
  3. < textarea>
< input>
我们可以通过< input> 元素轻松使用required属性, 如以下语法所示:
< input required>


< 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="http://www.srcmini.com/SUBMIT"> SUBMIT < /button> < /form> < /body> < /html>

立即测试
输出:
HTML required属性

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< select>
我们可以使用< select> 元素轻松使用required属性, 如以下语法所示:
< select required>


< 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="http://www.srcmini.com/BCA"> BCA< /option> < option value="http://www.srcmini.com/BBA"> BBA< /option> < option value="http://www.srcmini.com/B.Tech"> B.Tech< /option> < option value="http://www.srcmini.com/MBA"> MBA< /option> < option value="http://www.srcmini.com/MCA"> MCA< /option> < option value="http://www.srcmini.com/M.Tech"> M.Tech< /option> < /select> < button type="submit" VALUE="http://www.srcmini.com/SUBMIT"> SUBMIT < /button> < /form> < /body> < /html>

立即测试
输出:
HTML required属性

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< textarea>
【HTML required属性】我们还可以轻松地在< textarea> 元素中使用required属性, 如以下语法所示:
< textarea required>


< 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="http://www.srcmini.com/address" required> < /textarea> < button type="submit" VALUE="http://www.srcmini.com/SUBMIT"> SUBMIT < /button> < /form> < /body> < /html>

立即测试
输出:
HTML required属性

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浏览器支持
Element Chrome IE Firefox Opera Safari
< required> Yes Yes Yes Yes Yes

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