vue sets tab selection effect

With the continuous development of Web front-end technology, more and more websites and applications are now beginning to use popular JavaScript frameworks to build front-end interactive interfaces. Vue.js is currently a popular JavaScript framework. It adopts the MVVM architecture model, which can effectively improve the development efficiency and maintainability of web applications.

In Vue.js applications, you often encounter situations where you need to use the Tab function, such as tab switching, navigation labels, etc. In the Tab component, we often want to set the selection effect to enhance the interactive experience. This article will introduce how to use Vue.js to achieve this function.

1. Use Vue.js to create a Tab component

First, we need to create a Tab component in Vue.js. The Tab component can be divided into two parts: Tab navigation and Tab content area.

1.1 Create Tab Navigation

First, we need to define the HTML structure of Tab navigation in the component's template. In Vue.js, you can use the v-for directive to loop through an array, and the v-bind directive to bind the value of the array element to the attribute of the HTML element.

<template>
  <div class="tab">
    <ul class="tab-nav">
      <li v-for="(item, index) in tabs"
          :key="index"
          :class="{ 'active': index === currentIndex }"
          @click="handleClick(index)">
        {{ item }}
      </li>
    </ul>
    <div class="tab-content">
      <slot></slot>
    </div>
  </div>
</template>

In the above code, we define an array named "tabs" to store the tab titles in Tab navigation. Use the v-for command to iterate through the array and display each tab title as a li element. We use the :class directive to add the active class name to achieve the selection effect. At the same time, we use the @click directive to bind the click event. When the user clicks a tab, the handleClick method is triggered.

1.2 Create Tab content area

In the Tab content area, we can use the slot mechanism of Vue.js to achieve this. Specifically, we define a slot named TabContent in the component and use the slot in the Tab content area.

<template>
  <div class="tab">
    <ul class="tab-nav">
      <li v-for="(item, index) in tabs"
          :key="index"
          :class="{ 'active': index === currentIndex }"
          @click="handleClick(index)">
        {{ item }}
      </li>
    </ul>
    <div class="tab-content">
      <slot></slot>
    </div>
  </div>
</template>

2. Set the selection effect

Next, we need to add the selection effect to the Tab component. Specifically, when the user clicks a tab, we need to change the tab to the selected state and display the corresponding Tab content area.

2.1 Define the currentIndex variable in the data attribute

First, we need to define a variable named "currentIndex" in the data attribute of the component to record the currently selected tab index. At the same time, we set the initial value of this variable to 0, which means that the first tab is selected by default.

<script>
export default {
  name: 'Tab',
  data() {
    return {
      currentIndex: 0,
      tabs: ['Tab 1', 'Tab 2', 'Tab 3']
    };
  },
  methods: {
    handleClick(index) {
      this.currentIndex = index;
    }
  }
};
</script>

In the above code, we define the handleClick method, which is used to handle the event of clicking the tab. When the user clicks a tab, this method updates the currently selected index to the clicked index.

2.2 Use:class to bind the active class name

Next, we need to use the :class directive to bind the active class name to the tab. Specifically, we can use a ternary expression to determine whether a tab is selected. If so, add the active class name, otherwise do not add it.

<li v-for="(item, index) in tabs"
    :key="index"
    :class="{ 'active': index === currentIndex }"
    @click="handleClick(index)">
  {{ item }}
</li>

In the above code, we use the :class directive on the li element, which will determine whether to add the active class name based on whether the index is equal to the current index. In this way, when the user clicks on a tab, the style of the current tab will change to the selected state.

2.3 Display the corresponding Tab content

Finally, we need to use the slot mechanism of Vue.js to dynamically display the corresponding Tab content. Specifically, we can define a slot named "TabContent" in the component and use the v-if directive to determine whether the current tab is selected. If it is, the slot content is displayed, otherwise it is not displayed.

<template>
  <div class="tab">
    <ul class="tab-nav">
      <li v-for="(item, index) in tabs"
          :key="index"
          :class="{ 'active': index === currentIndex }"
          @click="handleClick(index)">
        {{ item }}
      </li>
    </ul>
    <div class="tab-content">
      <slot v-if="index === currentIndex"></slot>
    </div>
  </div>
</template>

In the above code, we use the v-if directive to determine whether the current tab is selected. If so, the slot contents are displayed.

3. Summary

It is very common to use the Tab component in Vue.js applications, and setting the Tab selection effect is also a necessary means to enhance the interactive experience. In this article, we introduce how to use Vue.js to create the Tab component and set the selection effect. We first defined the Tab navigation and Tab content area in the component, then used the :class directive and ternary expression to bind the active class name to the tab, and finally used the slot and v-if directive to dynamically display the corresponding Tab content. . I hope this article can help you better understand the use of Vue.js and how to achieve the Tab selection effect.

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