jQuery检查单选按钮 [英] jquery check radio button

问题描述

PHP一直在说unidentified index: gender?我不确定错误在哪里.

PHP keeps saying unidentified index: gender? I'm not sure where the error is.

HTML:

<label>Gender:</label> <input type="radio" name="gender" value="1">Male <input type="radio" name="gender" value="0">Female

jQuery:

gender: $("input[@name=gender]:checked").val()

PHP:

$gender = $_POST['gender'];
if($gender == '') {
  echo 'Please select gender';
} 

推荐答案

$("input[@name=gender]:checked")

在现代jQuery中，这是无效的选择器.这意味着未找到任何元素，因此未为gender设置任何值.您需要删除@并添加引号:

That is an invalid selector in modern jQuery. This means that no element is found, and therefore no value is set for gender. You need to remove the @ and add quote marks:

$("input[name='gender']:checked")

请参阅属性等于选择器的API .

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