CSS：改变孩子焦点的父母 [英] CSS: Change parent on focus of child

问题描述

假设您有以下内容：

<div class="parent">
    <input class="childInput" type="text" />
    <div class="sibling"></div>
</div>

我希望在孩子获得焦点时更改父/兄弟姐妹的外观。是否有任何CSS技巧可以做这样的事情？

I want to change the appearance of the parent/siblings when the child receives focus. Are there any CSS tricks for doing stuff like this?

编辑：

我的问题的原因如下：

我正在创建一个需要可编辑文本字段的Angular应用程序。它应该看起来像一个标签，直到它被点击，此时它应该看起来像一个普通的文本输入。我基于以下方式设置文本字段：focus以实现此效果，但文本被文本输入的边界切断。我还使用ng-show，ng-hide，ng-blur，ng-keypress和ng-click在标签和文本输入之间切换，基于模糊，按键和点击。除了一件事之外，这个工作正常：在标签的ng-click =setEdit（this，$ event）之后，将ng-show和ng-hide使用的编辑布尔值更改为true，它使用jQuery调用.select（）文字输入。但是，直到完成ng-click之后，所有内容都是$ digest'd，因此文本输入再次失去焦点。由于文本输入实际上从未实际获得焦点，因此使用ng-blur恢复显示标签是错误的：用户必须单击文本输入，然后再次单击它以恢复显示标签。

I'm creating an Angular app which needs editable text fields. It should look like a label until it is clicked, at which point it should look like a normal text input. I styled the text field based on :focus to achieve this effect, but the text is cut off by text input's boundaries. I also used ng-show, ng-hide, ng-blur, ng-keypress and ng-click to switch between the label and the text input based on blurs, key presses and clicks. This worked fine except for one thing: After the label's ng-click="setEdit(this, $event)" changes the edit boolean used by ng-show and ng-hide to true, it uses a jQuery call to .select() the text input. However, it isn't until after the completion of the ng-click that everything is $digest'd, so the text input loses focus again. Since the text input never actually receives focus, using ng-blur to revert back to showing the label is buggy: The user has to click in the text input and then click out of it again to revert back to showing the label.

编辑：

以下是问题的示例： http://plnkr.co/edit/synSIP?p=preview

推荐答案

您现在可以在纯CSS中执行此操作，因此不需要JavaScript。

You can now do this in pure CSS so no JavaScript is needed.

新的CSS伪类：focus-within 将有助于此类案例，当人们使用Tab键进行导航时，将有助于访问，在使用屏幕阅读器时常见。

The new CSS pseudo-class :focus-within would help for cases like this and will help with accessibility when people use tabbing for navigating, common when using screen readers.

.parent:focus-within {
  border: 1px solid #000;
}

---

---

：focus-within伪类匹配自己
匹配的元素：focus或具有匹配的后代：focus。

The :focus-within pseudo-class matches elements that either themselves match :focus or that have descendants which match :focus.

您可以查看哪些浏览器支持此 http://caniuse.com/#search=focus-在

You can check which browsers support this http://caniuse.com/#search=focus-within

fieldset {
  padding: 0 24px 24px !important;
}

fieldset legend {
  opacity: 0;
  padding: 0 8px;
  width: auto;
}

fieldset:focus-within {
  border: 1px solid #000;
}

fieldset:focus-within legend {
  opacity: 1;
}

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet" />

<div class="container">
  <form>
    <fieldset>
      <legend>Parent Element</legend>
      <div class="form-group">
        <label for="name">Name:</label>
        <input type="email" class="form-control" id="name" placeholder="Enter name">
      </div>
      <div class="form-group">
        <label for="email">Email:</label>
        <input type="email" class="form-control" id="email" placeholder="Enter email">
      </div>
    </fieldset>
  </form>
</div>

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