css overflow auto with fixed grid menu 不工作

Question

您好，我正在应对一项使用 CSS 网格实现的挑战。

我唯一的最后一个问题是我需要最上面的菜单，它的宽度固定为 520 像素，位置固定，以便在较小的设备上可以在水平轴上滚动，请指教？

出于某种原因 overflow-x:auto;在这种情况下似乎不起作用....

<!--html-->
<main>
    <div class="main-menu-container">
        <ul class="main-menu">
            <li class="main-menu__item"><a href="#" class="main-menu__link js-display-grid-items" >ALL</a></li>
            <li class="main-menu__item"><a href="#" class="main-menu__link js-display-grid-items" data-griditem="a">A</a></li>
            <li class="main-menu__item"><a href="#" class="main-menu__link js-display-grid-items" data-griditem="b">B</a></li>
            <li class="main-menu__item"><a href="#" class="main-menu__link js-display-grid-items"data-griditem="c">C</a></li>
            <li class="main-menu__item"><a href="#" class="main-menu__link js-display-grid-items" data-griditem="d">D</a></li>
            <li class="main-menu__item"><a href="#" class="main-menu__link js-display-grid-items" data-griditem="e">E</a></li>
        </ul>
    </div>
    <section class="main-grid">
        <article class="main-grid__item main-grid__item--type-a is-visible">A</article>
        <article class="main-grid__item main-grid__item--type-c is-visible">C</article>
        <article class="main-grid__item main-grid__item--type-b is-visible">B</article>
        <article class="main-grid__item main-grid__item--type-e is-visible">E</article>
        <article class="main-grid__item main-grid__item--type-b is-visible">B</article>
        <article class="main-grid__item main-grid__item--type-d is-visible">D</article>
        <article class="main-grid__item main-grid__item--type-a is-visible">A</article>
        <article class="main-grid__item main-grid__item--type-b is-visible">B</article>
        <article class="main-grid__item main-grid__item--type-c is-visible">C</article>
        <article class="main-grid__item main-grid__item--type-d is-visible">D</article>
        <article class="main-grid__item main-grid__item--type-a is-visible">A</article>
        <article class="main-grid__item main-grid__item--type-e is-visible">E</article>
    </section>
</main>
<script src="js/site.js" type="text/javascript" ></script>

CSS:

body {
padding: 0;
margin:0;
 }

main {
 max-width: 940px;
 margin: 0 auto;
 font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande',   'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
 position: relative;
 padding: 0 15px;
  box-sizing:border-box;

  }
.main-menu-container {
position: fixed;
width: 910px;
top:0;
float:left;
height: 40px;

 }
.main-menu {
 display: grid;
 list-style: none;
 grid-template-columns: repeat(6, 1fr);
grid-gap: 20px;
padding: 0;
overflow-x: auto;
margin:0;
padding: 1em 0;
background: #fff;
width: 100%;
height: 100%;


 }

.main-menu__link {
display: block;
text-align: center;
padding:0.4em;
background-color: #9A9B9E;
color: #fff;
text-decoration: none;

 }

https://codepen.io/angusgrant/pen/Xqzrry

Answer 1

在您的演示中，您将最顶部的菜单 (.main-menu) 设置为 width: 910px。

.main-menu {
    display: grid;
    list-style: none;
    grid-template-columns: repeat(6, 1fr);
    grid-gap: 20px;
    padding: 0;
    position: static;
    overflow-x: auto;
    margin: 0;
    padding: 1em 0;
    background: #fff;
    width: 910px;     <----------
    height: 100%;
}

您将此菜单的父容器 (.main-menu-container) 也设置为 width: 910px。

.main-menu-container {
    position: absolute;
    width: 910px;     <----------
    top: 0;
    left: 15px;
}

由于它们的宽度始终相同，因此无论屏幕大小如何，都不可能出现溢出。

要允许溢出条件，请对父级进行此调整:

.main-menu-container {
    position: absolute;
    /* width: 910px; */
    top: 0;
    left: 15px;
    width: 100%;       /* new */
    overflow-x: auto;  /* new */
}

revised codepen