javascript - 获取一组单选按钮值

Question

给定一个单选按钮数组。例如，如何获取它们的值数组(包括空值)。

// use jquery to display [Yes, null, null, No]

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>
    true     <input type="radio" name="one" value="Yes" checked>
    false    <input type="radio" name="one" value="No">
    </p>
    <p>
    true     <input type="radio" name="two" value="Yes">
    false    <input type="radio" name="two" value="No">
    </p>
    <p>
    true     <input type="radio" name="three" value="Yes" >
    false    <input type="radio" name="three" value="No" >
    </p>
    <p>
    true     <input type="radio" name="four" value="Yes">
    false    <input type="radio" name="four" value="No" checked >
    </p>

我如何得到 [Yes, null, null No]

Answer 1

1. 您需要检查每个 <p>选中的单选框长度

2. 如果长度为 0，则推送 NULL数组否则推送选中的单选按钮值

工作片段:-

$(document).ready(function(){
  var radio_arr = [];
  $('p').each(function(){
    radio_arr.push($(this).find('input[type=radio]:checked').length ? $(this).find('input[type=radio]:checked').val() : 'NULL');
  });
  console.log(radio_arr);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>
    true     <input type="radio" name="one" value="Yes" checked>
    false    <input type="radio" name="one" value="No">
    </p>
    <p>
    true     <input type="radio" name="two" value="Yes">
    false    <input type="radio" name="two" value="No">
    </p>
    <p>
    true     <input type="radio" name="three" value="Yes" >
    false    <input type="radio" name="three" value="No" >
    </p>
    <p>
    true     <input type="radio" name="three" value="Yes">
    false    <input type="radio" name="three" value="No" checked >
    </p>