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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/zh-cn/web/css/_colon_focus-within/index.html | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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diff --git a/files/zh-cn/web/css/_colon_focus-within/index.html b/files/zh-cn/web/css/_colon_focus-within/index.html new file mode 100644 index 0000000000..e638f478b5 --- /dev/null +++ b/files/zh-cn/web/css/_colon_focus-within/index.html @@ -0,0 +1,97 @@ +--- +title: ':focus-within' +slug: 'Web/CSS/:focus-within' +tags: + - ':focus-within' + - CSS + - Layout + - Pseudo-class + - 伪类 + - 参考 + - 选择器 +translation_of: 'Web/CSS/:focus-within' +--- +<div>{{CSSRef}}</div> + +<p><strong><code>:focus-within</code></strong> 是一个<a href="/zh-CN/docs/Web/CSS">CSS</a> <a href="/zh-CN/docs/Web/CSS/Pseudo-classes">伪类</a> ,表示一个元素获得焦点,或,该元素的后代元素获得焦点。换句话说,元素自身或者它的某个后代匹配 {{CSSxRef(":focus")}} 伪类。(<a href="/zh-CN/docs/Web/Web_Components/Shadow_DOM">shadow DOM 树</a>中的后代也包括在内)</p> + +<pre class="brush: css no-line-numbers">/* 当 <div> 的某个后代获得焦点时,匹配 <div> */ +div:focus-within { + background: cyan; +}</pre> + +<p>该选择器非常实用。举个通俗的例子:表单中的某个 {{htmlElement("input")}} 字段获得焦点时,整个表单的 {{HTMLElement("form")}} 元素都可被高亮。</p> + +<h2 id="语法">语法</h2> + +<pre class="syntaxbox">{{csssyntax}}</pre> + +<h2 id="Example">Example</h2> + +<p>此例子中,当表单某个文本输入框获得焦点后,表单会被设置颜色样式。</p> + +<h3 id="HTML">HTML</h3> + +<pre class="brush: html"><p>试试在这个表单中输入点什么。</p> + +<form> + <label for="given_name">Given Name:</label> + <input id="given_name" type="text"> + <br> + <label for="family_name">Family Name:</label> + <input id="family_name" type="text"> +</form></pre> + +<h3 id="CSS">CSS</h3> + +<pre class="brush: css">form { + border: 1px solid; + color: gray; + padding: 4px; +} + +form:focus-within { + background: #ff8; + color: black; +} + +input { + margin: 4px; +} +</pre> + +<h3 id="结果">结果</h3> + +<p>{{EmbedLiveSample("Example", 500, 150)}}</p> + +<h2 id="规范">规范</h2> + +<table class="standard-table"> + <thead> + <tr> + <th scope="col">规范</th> + <th scope="col">状态</th> + <th scope="col">备注</th> + </tr> + </thead> + <tbody> + <tr> + <td>{{SpecName("CSS4 Selectors", "#the-focus-within-pseudo", ":focus-within")}}</td> + <td>{{Spec2("CSS4 Selectors")}}</td> + <td>Initial definition.</td> + </tr> + </tbody> +</table> + +<h2 id="浏览器兼容性">浏览器兼容性</h2> + + + +<p>{{Compat("css.selectors.focus-within")}}</p> + +<h2 id="参见">参见</h2> + +<ul> + <li>{{CSSxRef(":focus")}}</li> + <li>{{CSSxRef(":focus-visible")}} {{Experimental_Inline}}</li> +</ul> |