How to implement the hidden function of bottom navigation in uniapp

When using uniapp to develop mobile applications, the existence of the bottom navigation bar can help users quickly switch pages and functions, improving user experience and operational efficiency. However, in some special cases, we may need to hide the bottom navigation bar. This article will introduce how to hide the bottom navigation in uniapp.

1. Basic use of the bottom navigation bar

The bottom navigation bar of uniapp is configured in the pages.json file, where we can set the style, icon and jump of the bottom menu bar Information about the page to be redirected. The following is a simple sample code:

{
  "pages":[
    {
      "path":"pages/index/index",
      "name":"index",
      "style":{
        "navigationBarTitleText":"首页"
      }
    },
    {
      "path":"pages/user/user",
      "name":"user",
      "style":{
        "navigationBarTitleText":"个人中心"
      }
    }
  ],
  "tabBar":{
    "color":"#666",
    "selectedColor":"#4285f4",
    "backgroundColor":"#ffffff",
    "list":[
      {
        "pagePath":"pages/index/index",
        "text":"首页",
        "iconPath":"static/img/tabbar/home.png",
        "selectedIconPath":"static/img/tabbar/home-selected.png"
      },
      {
        "pagePath":"pages/user/user",
        "text":"我的",
        "iconPath":"static/img/tabbar/user.png",
        "selectedIconPath":"static/img/tabbar/user-selected.png"
      }
    ]
  },
  "globalStyle":{
    "navigationBarBackgroundColor":"#fff",
    "navigationBarTextStyle":"black"
  }
}

In the above code, the "pages" array is used to configure all page information, and the "tabBar" object is used to configure the style and jump information of the bottom menu bar. Among them, each object in the "list" array represents a bottom menu item, including "pagePath" (jump page path), "text" (menu item text), "iconPath" (icon path when not selected) and "selectedIconPath" ” (icon path when selected) and other attributes.

2. Methods of hiding the bottom navigation bar

In some scenarios, we may need to hide the bottom navigation bar in order to achieve special interactive effects or full-screen display and other functions. In uniapp, there are several ways to hide the bottom navigation bar:

1. Use the meta information of vue-router

You can set the page through the meta information of vue-router Some special properties, such as whether to hide the bottom navigation bar. When configuring vue-router in pages.json, you can add the meta field, add the required information in meta, and use this.$route.meta.xxx to obtain it in the page component.

{
  "pages": [
    {
      "path": "pages/index/index",
      "name": "index",
      "meta": {
        "showTabbar": true
      }
    },
    {
      "path": "pages/user/user",
      "name": "user",
      "meta": {
        "showTabbar": false
      }
    }
  ],
  "tabBar": {...}
}

In the above code, add the "meta" field in pages.json to set whether the page needs to display the bottom navigation bar, which can be obtained through this.$route.meta.showTabbar in the component.

In pages where the bottom navigation bar is hidden, we need to manually set the style at the bottom of the page. For example, set a div with a height equal to the height of the bottom navigation bar to replace the navigation bar to ensure that the page is displayed normally.

<template>
  <div>
    <div class="content">
      ...
    </div>
    <div class="placeholder"></div>
  </div>
</template>

<style>
  .placeholder {
    height: 100rpx;
  }
</style>

In the above code, we added a div with a height of 100rpx at the bottom to replace the position of the bottom navigation bar.

2. Use global variables in app.vue to control whether the bottom navigation bar is displayed

In the uniapp main entry file app.vue, we can define a global variable to Controls whether the bottom navigation bar is displayed. The specific operation method is as follows:

<template>
  <div class="app">
    <uni-tab-bar v-if="showTabBar" />
    <router-view />
  </div>
</template>

<script>
export default {
  data() {
    return {
      showTabBar: true
    }
  },
  mounted() {
    const pages = getCurrentPages()
    const currentPage = pages[pages.length - 1]
    this.showTabBar = currentPage.route.indexOf('/home') !== -1 // 在这里根据当前页面路由来设置showTabBar的值
  }
}
</script>

In the above code, we determine whether the bottom navigation bar needs to be displayed by getting the current page route. If it needs to be displayed, set the showTabBar variable to true, otherwise set it to false. In the app.vue component, we use the v-if directive to decide whether to display the bottom navigation bar based on the value of showTabBar.

In the page where the bottom navigation bar is hidden, we also need to add a div with a height equal to the height of the bottom navigation bar to ensure that the page is displayed normally.

<template>
  <div>
    <div class="content">
      ...
    </div>
    <div class="placeholder"></div>
  </div>
</template>

<style>
  .placeholder {
    height: 100rpx;
  }
</style>

3. Use dynamic binding in the uni-tab-bar component to control whether the bottom navigation bar is displayed

uni-tab-bar is the default tab provided by uniapp Bar component where we can use dynamic binding to control the showing and hiding of the bottom navigation bar. The specific operation method is as follows:

<template>
  <div class="tab-bar" :class="{&#39;hidden&#39;:hidden}">
    <div class="item" v-for="(tab,index) in tabList" :key="index" @click="switchTab(index)">
      <div class="icon" :class="{&#39;active&#39;:tab.active}">
        <img :src="tab.active ? tab.selectedIconPath : tab.iconPath" />
      </div>
      <div class="text" :class="{&#39;active&#39;:tab.active}">{{tab.text}}</div>
    </div>
  </div>
</template>

<script>
export default {
  props: {
    hidden: Boolean,
    tabList: Array,
    color: String,
    selectedColor: String,
    backgroundColor: String
  },
  methods: {
    switchTab(index) {
      this.$emit('switchTab', index)
    }
  }
}
</script>

<style>
  .hidden {
    display: none;
  }
</style>

In the above code, we define a hidden attribute to control the display and hiding of the bottom navigation bar. When introducing the uni-tab-bar component into the page component, we can control whether the bottom navigation bar is displayed by dynamically binding the hidden attribute.

In pages where the bottom navigation bar is hidden, we need to manually set the style at the bottom of the page, for example, add a div with a height equal to the height of the bottom navigation bar to replace the navigation bar.

<template>
  <div class="content">
    ...
  </div>
  <div class="placeholder"></div>
</template>

<style>
  .placeholder {
    height: 100rpx;
  }
</style>

The above are three methods to hide the bottom navigation bar in uniapp. When using it, you should choose the most appropriate method according to your own needs.

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