选中了哪个单选按钮? [英] which radio button is checked?

问题描述

我想检查选中了哪个单选按钮.然后，在问这个问题之前，我先看了这里的问题，然后他们说代码

I wanted to check which radio button is checked. Then, I looked at the questions in here before i asked this question and they said that the code

        if(document.getElementById('number1').checked) 

是答案.但是，我收到了错误消息使用未定义的常量文档-假定为'document'"和

is the answer. But, i got the error "Use of undefined constant document - assumed 'document'" and

Call to undefined function getElementById().

哪里出错了?我是否必须编写getElementById('number1').checked的功能，因为它说未定义"? 谢谢

Where did it go wrong? Did i have to write the function of getElementById('number1').checked because it says "undefined"? Thanks

推荐答案

您的代码是Javascript.要检查PHP中单选按钮的值，它需要具有name属性，该属性是通过GET或POST形式发送的.

Your code is Javascript. To check the value of a radio button in PHP, it needs to have a name attribute, which was sent in a form either by a GET or POST.

// If form method='get'
if (isset($_GET['name_of_radio_group'])) {

  // Show the radio button value, i.e. which one was checked when the form was sent
  echo $_GET['name_of_radio_group'];
}

// If form method='post'
if (isset($_POST['name_of_radio_group'])) {

  // Show the radio button value, i.e. which one was checked when the form was sent
  echo $_POST['name_of_radio_group'];
}

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