css implementation tab

CSS implements Tab style

Tab style is a very common interactive design in web development. It displays multiple content areas in the form of tab pages. The user switches the display area by clicking on the tab, which greatly Improved the usability of web pages. In this article, we'll show you how to implement a simple Tab style using CSS.

First, we need to define the HTML structure. The specific structure is as follows:

<div class="tab">
  <div class="tab-header">
    <button class="tab-button active">Tab 1</button>
    <button class="tab-button">Tab 2</button>
    <button class="tab-button">Tab 3</button>
  </div>
  <div class="tab-content active">
    <p>这里是 Tab 1 的内容</p>
  </div>
  <div class="tab-content">
    <p>这里是 Tab 2 的内容</p>
  </div>
  <div class="tab-content">
    <p>这里是 Tab 3 的内容</p>
  </div>
</div>

In the above structure, we use the div element as the container, which contains two sub-elements, namely the tab header. and tab content. The tab header uses a button element to represent each tab, and the tab content is wrapped using a div element. Among them, each tab and tab content are associated with an active class name, which is used to represent the currently selected tab.

Next, we start using CSS to define styles. First, we need to remove the default style of the button element:

button {
  background: transparent;
  border: none;
  outline: none;
  padding: 0.5rem 1rem;
  cursor: pointer;
}

In the above style, we remove the background, border, outline and padding of the button element to make it look like a plain text link. And set the mouse pointer style to a hand shape to make it look more like a clickable button.

Next step, we set the style of .tab-header to realize the background color and activation status of the tab:

.tab-header {
  display: flex;
}

.tab-button {
  background-color: #f4f4f4;
}

.tab-button:hover {
  background-color: #ddd;
}

.tab-button.active {
  background-color: #ddd;
}

In the above style, we use Flexbox layout to arrange tabs horizontally. Then, we define the background color of .tab-button and the background color of the hover state. Finally, we use the class name .active to represent the currently active tab, and we set its background color to the same as the hover state so that the active state of the tab is displayed directly when the page loads.

Now, we just need to define a class name for each tab and add the active class name to the first tab. For example:

<button class="tab-button active tab-1">Tab 1</button>
<button class="tab-button tab-2">Tab 2</button>
<button class="tab-button tab-3">Tab 3</button>

In the above structure, we added a class name for each tab tab-1, tab-2, tab -3. These class names will be used to define CSS styles for the respective tabs.

Next step, we set the style of .tab-content to display and hide the tab content:

.tab-content:not(.active) {
  display: none;
}

In the above style, we use :not(.active) Selector to match the content of the tab except the active state. We set their display property to none so that they are hidden on the page.

Finally, we use JavaScript to bind events to implement the function of clicking the tab to switch content:

const tabs = document.querySelectorAll('.tab-button')

tabs.forEach(tab => {
  tab.addEventListener('click', () => {
    // 隐藏所有选项卡内容
    document.querySelectorAll('.tab-content').forEach(content => {
      content.classList.remove('active')
    })
    // 显示当前选项卡内容
    const activeTab = tab.classList[1]
    document.querySelector(`.${activeTab}`).classList.add('active')
    // 切换选项卡的激活状态
    tabs.forEach(tab => {
      tab.classList.remove('active')
    })
    tab.classList.add('active')
  })
})

In the above code, we use the querySelectorAll() method Selects all tab content elements and loops through them when the tab is clicked, removing all their active class names. Then, we use the classList attribute to get the content element corresponding to the current tab, and add the active class name to display the tab content. Finally, we remove the activation state of all tabs and add the active class name to the current tab to make it active. In this way, we have successfully implemented a simple Tab style.

Summary:

In this article, we used CSS and JavaScript to implement a simple Tab style. We first defined the HTML structure and then used CSS to define the tab's background color, hover state, and activation state. Finally, we use JavaScript to implement the function of switching content by clicking on the tab. The implementation of this style is simple, easy to understand and modify, and is suitable for most web development projects.

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