如何在实时JS中用键盘更新单选按钮检查状态

Question

所以我有一个带有隐形单选按钮的手风琴。一切都很好，直到我试着获得单选按钮的状态。对于每个手风琴单选按钮，我有4行代码：

const ac1 = document.getElementById('ac-1');

单选按钮包装在表单中：

<form class="ac-container">
<input id="ac-1" name="accordion-1" type="radio" checked="checked">
<input id="ac-2" name="accordion-1" type="radio">
<input id="ac-3" name="accordion-1" type="radio">
<input id="ac-4" name="accordion-1" type="radio">
</form>

这是我的单选按钮CSS：

.ac-container input {
    opacity: 0;
}

要检查单选按钮的状态，我尝试了：

if (ac1.checked) {
  //do something
} 

if (document.getElementById('ac-1').checked) {
  //do something
}

我需要单选按钮状态，这样我就可以实时显示东西了。对于常规的点击，我只是使用addEventListener('click', (e) => {}，它工作得很好，但我需要单选按钮也与键盘一起工作。这就是我需要状态的原因，所以如果选中单选按钮，我可以立即更新所需的内容。

我不确定这是否是问题所在，但是，当我单击单选按钮时，“选中”属性永远不会从一个按钮转移到另一个按钮？

如果我发现什么，我会继续寻找和更新。

Answer 1

您可以监听input事件。

示例：

<input type="radio" name="value" id="inp">
<input type="radio" name="value" id="inp2">
<script>

const inp = document.getElementById("inp")
const inp2 = document.getElementById("inp2")

inp.addEventListener('input', (e) => {
    console.log(inp.checked)
})

inp2.addEventListener('input', (e) => {
    console.log(inp.checked)
})
</script>

Answer 2

从我上面的评论..。

“由于OP使用复选框和/或无线电控件，为什么OP需要一个基于JavaScript的解决方案？(几乎)一切都可以通过纯HTML/CSS实现。

​

[data-accordion] [type="radio"] + p,
[data-accordion] [type="checkbox"] + p {
  height: 0;
  overflow: hidden;
  opacity: 0;
  transition: opacity 2.5s ease-out;
  
}
[data-accordion] [type="radio"]:checked + p,
[data-accordion] [type="checkbox"]:checked + p {
  height: auto;
  opacity: 1;
}
h2 { margin: 0; font-size: 1em; }
p { margin: 0; }

<article data-accordion>
  <section>
    <h2>Topic 4</h2>
    <input type="radio" name="single-fold" />
    <p>
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi nec lectus ante. Suspendisse sed tortor purus. Suspendisse potenti. Nunc pharetra odio id lorem pellentesque tincidunt.
    </p>
  </section>
  <section>
    <h2>Topic 5</h2>
    <input type="radio" name="single-fold" />
    <p>
      Praesent ut ipsum efficitur, commodo lectus eu, maximus risus. Fusce eu ipsum mauris. Pellentesque semper neque a convallis consequat. Suspendisse eu urna quis est condimentum dapibus id ac lectus. Nulla sit amet hendrerit arcu.
    </p>
  </section>
  <section>
  <h2>Topic 6</h2>
  <input type="radio" name="single-fold" />
  <p>
    Vestibulum vel sapien convallis diam iaculis consectetur non non ex. Suspendisse eget hendrerit ipsum. Suspendisse finibus quam eget est fringilla, finibus vehicula tortor varius. Praesent fermentum ac odio a ullamcorper.
    </p>
  </section>
</article>

<hr/>

<article data-accordion>
  <section>
    <h2>Topic 1</h2>
    <input type="checkbox" />
    <p>
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi nec lectus ante. Suspendisse sed tortor purus. Suspendisse potenti. Nunc pharetra odio id lorem pellentesque tincidunt.
    </p>
  </section>
  <section>
    <h2>Topic 5</h2>
    <input type="checkbox" />
    <p>
      Praesent ut ipsum efficitur, commodo lectus eu, maximus risus. Fusce eu ipsum mauris. Pellentesque semper neque a convallis consequat. Suspendisse eu urna quis est condimentum dapibus id ac lectus. Nulla sit amet hendrerit arcu.
    </p>
  </section>
  <section>
  <h2>Topic 3</h2>
    <input type="checkbox" />
  <p>
    Vestibulum vel sapien convallis diam iaculis consectetur non non ex. Suspendisse eget hendrerit ipsum. Suspendisse finibus quam eget est fringilla, finibus vehicula tortor varius. Praesent fermentum ac odio a ullamcorper.
    </p>
  </section>
</article>

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