CSS layout attribute optimization skills: position sticky and flexbox

In web development, layout is a very important aspect. A good layout structure can improve the user experience and make the page more beautiful and easy to navigate. CSS layout properties are the key to achieving this goal. In this article, I will introduce two commonly used CSS layout property optimization techniques: position sticky and flexbox, and provide specific code examples.

1. Position sticky

Position sticky is a relatively new property in CSS. It allows an element to be fixed at a certain position on the page when scrolling until it is scrolled to the specified position and then released. fixed. This effect is similar to position fixed, but sticky can automatically switch between fixed and unfixed states according to the scroll position.

There are usually two prerequisites for using the position sticky attribute: first, you need to set a positioning attribute for the element (such as position:relative or position:absolute); secondly, you need to set top, bottom, left or right. at least one.

Code example:

HTML part:

<div class="container">
   <div class="header">
      <h1>這是一個(gè)頂部導(dǎo)航欄</h1>
   </div>
   <div class="content">
      <p>這是頁(yè)面的主要內(nèi)容</p>
   </div>
   <div class="sidebar">
      <p>這是一個(gè)側(cè)邊欄，可以在滾動(dòng)時(shí)固定在頁(yè)面</p>
   </div>
</div>

CSS part:

.container {
   height: 800px; /* 設(shè)置容器的高度，用于演示滾動(dòng)效果 */
   position: relative;
}

.header {
   background-color: #f1f1f1;
   padding: 20px;
}

.sidebar {
   width: 200px;
   position: sticky;
   top: 100px;
}

.content {
   padding: 20px;
}

In the above code example, we set up a container div and It contains a top navigation bar, a main content area and a sidebar. Notice that in the CSS style of the sidebar, we set the position attribute to sticky and set the top attribute to 100px. In this way, when the page scrolls down, the sidebar will be fixed at a position 100px from the top, and will not be unfixed until it scrolls to the specified position.

2. Flexbox

Flexbox is a powerful layout model in CSS that can easily layout elements in one or two dimensions. It is ideal for designing responsive web layouts and has easy-to-understand syntax and powerful performance.

Code example:

HTML part:

<div class="container">
   <div class="header">
      <h1>這是一個(gè)頂部導(dǎo)航欄</h1>
   </div>
   <div class="content">
      <div class="sidebar">
         <p>這是一個(gè)側(cè)邊欄</p>
      </div>
      <div class="main">
         <p>這是頁(yè)面的主要內(nèi)容</p>
      </div>
   </div>
</div>

CSS part:

.container {
   display: flex;
   flex-direction: column;
   height: 800px;
}

.header {
   background-color: #f1f1f1;
   padding: 20px;
}

.content {
   display: flex;
   flex: 1;
}

.sidebar {
   width: 200px;
   background-color: #f9f9f9;
   padding: 20px;
}

.main {
   flex: 1;
   padding: 20px;
}

In the above code example, set the display attribute to flex on the container div , and use the flex-direction property to set the arrangement direction of the elements to vertical (column). In this way, the elements within the container will be arranged in order from top to bottom.

In addition, we can also use the flex attribute to adaptively layout the sidebar and main content area. By setting the value of the .flex property, elements can be distributed in proportion to the space they occupy. In the above example, the .flex properties of the sidebar and main content area are set to 1 respectively. This means that they will occupy the remaining space in equal proportions.

To sum up, this article introduces two commonly used CSS layout attribute optimization techniques: position sticky and flexbox, and provides specific code examples. By rationally using these layout techniques, we can be more flexible in page design and layout, improve user experience, and create beautiful and easy-to-navigate web pages.

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