Vue component development: implementation method of tab page component

Vue component development: Tab component implementation method

In modern web applications, the tab page (Tab) is a widely used UI component. The Tab component can display multiple related content on a single page and switch them by clicking on the tab. In this article, we will introduce how to implement a simple tab component using Vue.js and provide detailed code examples.

Structure of Vue tab component

Tab component usually consists of two parts: label (Tab) and panel (Panel). Labels identify panels, and panels display content related to labels. Therefore, there is a one-to-many relationship between labels and panels, with each label corresponding to one panel.

In Vue, the tab component can be implemented with the following HTML structure:

<template>
  <div>
    <ul class="tabs">
      <li v-for="(tab, index) in tabs" 
          :key="index" 
          :class="{'active': isActiveTab(index)}" 
          @click="activeTab = index">
        {{ tab.name }}
      </li>
    </ul>
    <div class="panels">
      <slot></slot>
    </div>
  </div>
</template>

In this structure, we have a list containing multiple Tabs and a container containing multiple Panels . The Panel corresponding to the selected Tab will be displayed. Tab can be implemented as an array of objects. Each tab has a name attribute indicating its name. The isActiveTab(index) method is used to check whether the Tab is active when the Tab is clicked, that is, whether it is selected. The activeTab attribute is used to store the index of the currently active Tab.

Next, we will introduce some JavaScript code required in Vue components to control the interaction between labels and panels.

Control logic of Vue tab component

To implement the Vue tab component, we need to write some JavaScript code to control the interaction between Tab and Panel. The following is a simple example:

<script>
export default {
  data() {
    return {
      activeTab: 0, // 默认选中第一个标签
      tabs: [], // 存储标签的数组
    };
  },
  methods: {
    isActiveTab(index) {
      return this.activeTab === index;
    },
    addTab(tab) {
      this.tabs.push(tab);
    },
  },
  mounted() {
    this.tabs = this.$children;
  },
};
</script>

In this JavaScript code, we first define the properties required in the two Vue components. The activeTab attribute is used to store the index of the currently active Tab, and the tabs array is used to store all tabs. Next, we define two methods, isActiveTab(index) and addTab(tab).

The function of isActiveTab(index) is to determine whether the Tab is selected. If the current Tab index is equal to the given index in the tab array, then this method will return True, indicating that the current Tab is active.

addTab(tab) method is used to add a new tab to the tab array. We can put the panel into the Tab by using v-slot:

<Tabs>
  <Tab name="Tab1">
    <div>
      <h1 id="Tab-content">Tab 1 content</h1>
    </div>
  </Tab>
  <Tab name="Tab2">
    <div>
      <h1 id="Tab-content">Tab 2 content</h1>
    </div>
  </Tab>
  <Tab name="Tab3">
    <div>
      <h1 id="Tab-content">Tab 3 content</h1>
    </div>
  </Tab>
</Tabs>

The above code defines 3 new tabs, all of which contain some text content. Here we can see how to add tabs to slots within the component.

Finally, we added the Vue life cycle hook function mounted to put all the children's tabs into the component's tabs array. The result of this processing is that when the component is mounted to the DOM, we can pass the tab of the subcomponent into the Tabs component to add a new tab using the component.

Styles for the Vue tab component

Now, we need to add styles to the Vue tab component. Here is a simple CSS code example:

.tabs {
  display: flex;
  justify-content: space-between;
  list-style: none;
  padding: 0;
  margin: 0;
}

.tabs li {
  padding: 10px;
  background-color: #ececec;
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
  cursor: pointer;
  border: 1px solid #ccc;
  margin-right: 2px;
}

.tabs li.active {
  background-color: white;
  border-bottom: none;
}

.panels {
  border: 1px solid #ccc;
  padding: 20px;
  border-bottom-left-radius: 5px;
  border-bottom-right-radius: 5px;
}

In this CSS code, we add some basic styles to control the interaction between labels and panels. Specifically, we defined a Flex layout so that all labels are arranged horizontally. We also added some styles to the labels such as background color, borders, spacing, mouse pointer styles, etc.

For the selected label, we set its background color to white and eliminate the bottom border. Panels also have similar styles for displaying content related to the selected tag.

Use of Vue tab component in applications

Now, we have learned how to use Vue.js to implement a simple tab component. In order for this component to really work, we need to apply it to an actual project.

Suppose we have an e-commerce website, and our main page needs a tab component to display products, orders, and account information. We can create this page using the Vue tab component:

<template>
  <div>
    <Tabs>
      <Tab name="Products">
        <!-- 在这里放置商品内容的HTML -->
      </Tab>
      <Tab name="Orders">
        <!-- 在这里放置订单内容的HTML -->
      </Tab>
      <Tab name="Account">
        <!-- 在这里放置账户内容的HTML -->
      </Tab>
    </Tabs>
  </div>
</template>

In this way, we can quickly create a page with multiple tabs and switch them easily. At the same time, when maintaining the code, we can more easily manage and modify the code of Tab and Panel, thereby improving the readability and maintainability of the code.

Summary

The Vue tab component is one of the very common UI elements in web applications. In order to create a tab component in Vue.js, we need to write HTML, JavaScript and CSS code for it. Importantly, the tab component consists of two related parts: tabs and panels. In Vue.js, we can easily add panels to tags using the v-slot directive, creating a clean, easy-to-maintain and easy-to-extend code structure.

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