How to implement inertial sliding & rebound Vue navigation bar on mobile terminal

This time I will show you how to implement the inertial sliding & rebounding Vue navigation bar on the mobile terminal. What are the precautions for realizing the inertial sliding & rebounding Vue navigation bar on the mobile terminal. The following is a practical case. Let’s take a look.

I wrote an adaptive sliding Vue navigation bar component for mobile some time ago. I think it has certain practicality and everyone may use it (of course there is no need if some big guys write better themselves), so I sorted it out two days ago and it has been published to npm and GitHub. Click me to go to npm and click me to the GitHub project. Students in need can npm install ly-tab -S or yarn add ly-tab Use, the specific usage will be discussed below.

Okay, let’s take a look at the results first

Okay, let’s start talking nonsense. The internship has been almost 3 months. During this time, I have been following the mentor. I have also been exposed to some projects and learned a lot. The projects I have come into contact with are basically mobile projects, and the framework mainly uses Vue. Students who have worked on mobile devices or used mobile apps (bah, bullshit) will definitely find that many times there is a tab navigation bar with a sliding effect similar to the one above. I believe you must have seen it on the homepage of the Nuggets.

Implementation ideas

The project at that time happened to have this demand, so I wanted to be lazy and use the Mint-ui component library directly There are ready-made tabbar and tab-item components. I looked at its implementation source code on github and found that it only implements the switching function but cannot slide. So, if I am too lazy, I have to write it myself.

In fact, it is not difficult to implement the tab switching function. Mint-ui actually uses v-model syntax sugar, just like the following

<ly-tab v-model="selected">
  <ly-tab-item></ly-tab-item>
</ly-tab>

The following is the disassembly of v-model syntax The implementation of sugar

<ly-tab :value="selected" @input="selected = arguments[0]">
  <ly-tab-item></ly-tab-item>
</ly-tab>

Then you only need to implement it in the tab-item component. When it is clicked, let its parent component, which is the ly-tab component, $emit an input event, and pass in an identification event for each tab. The unique value of -item is used as the first parameter. Regarding this unique value, mint-ui requires the user to manually pass in a unique id value to each tab-item through props. The following is the demo implementation of Mint UI:

<mt-tabbar v-model="selected">
  <mt-tab-item id="订单">
    <img slot="icon" src="http://placehold.it/100x100">
    <span slot="label">订单</span>
  </mt-tab-item>
 </mt-tabbar>

However, after reading the boss’s thoughts on designing the Tabbar plug-in in vue, I feel that the approach in the article is better, because for the parent component , As long as you know which <ly-tab-item/> is clicked, then I put the index of each <ly-tab-item/> component Wouldn't it be enough to use the index value as its unique identification value?

Then the question is: How to get its own index value inside the tab-item component?

First of all, the $children of the ly-tab component is an array. Since each <ly-tab-item/> component is created sequentially and inserted into the array by push, so each <ly-tab-item/> component is created and pushed to $children , for the <ly-tab-item/> component (this.$parent.$children.length || 1) - 1 Isn’t it just every < ly-tab-item/> The only index value of the component. In fact, the click-to-switch function can already be implemented here. Paste the code in tab-item.vue below:

tab-item.vue

<template>
 <a class="ly-tab-item"
    :style="$parent.value === id ? activeStyle : {}"
    @click="$parent.$emit(&#39;input&#39;, id)">
  <p class="ly-tab-item-icon"><slot name="icon"></slot></p>
  <p class="ly-tab-item-label"><slot></slot></p>
 </a>
</template>
<script>
export default {
 name: 'LyTabItem',
 computed: {
  activeStyle () {
   return {
    color: this.$parent.activeColor,
    borderColor: this.$parent.activeColor,
    borderWidth: this.$parent.lineWidth,
    borderBottomStyle: 'solid'
   }
  }
 },
 data () {
  return {
   id: (this.$parent.$children.length || 1) - 1
  }
 }
}
</script>
<style lang="scss">
.ly-tab-item {
 text-decoration: none;
 text-align: center;
 .ly-tab-item-icon {
  margin: 0 auto 5px;
 }
 .ly-tab-item-label {
  margin: 0 auto 10px;
  line-height: 18px;
 }
}
</style>

Regarding the implementation of touch sliding, inertial sliding and rebound effects in tab.vue, there is no discussion here. The method is explained in detail. Interested friends can check it out on github. Click me to check out the project on github. If you want to see a sample demo, you can clone the project locally and run it. You are welcome to correct me if it is not well written. If you think it is useful It would be best if you can get it or be able to help everyone, so you might as well give it a star, haha...

Hey, hey, that’s not right, why did you start asking for a star? The most important thing is I haven’t talked about it yet—how to use ly-tab?

How to use ly-tab

If you want to use ly-tab, you need to download it through npm or yarn in your project Installation:

npm install ly-tab -S
or
yarn add ly-tab

Then import it globally in main.js:

import Vue from 'vue';
import LyTab from 'ly-tab';
Vue.use(LyTab);

Then you can use it in your project <ly-tab></ly-tab&gt ; and <ly-tab-item></ly-tab-item> component without the need to introduce it again

chestnut

<ly-tab v-model="selected" fixBottom>
 <!-- selected是你自己定义的一个在data中用于存放当前tab-item的索引值的变量 -->
 <ly-tab-item v-for="(item, index) in tabList" :key="index">
  {{item.itemName}}
 </ly-tab-item>
</ly-tab>

上面的栗子其实只是tabbar的实现，大家项目中肯定还需要做视图区的切换，在这里简单说一下我目前的做法：

• 使用Vue-router做router-view的切换

• 使用动态组件（可以配合异步组件使用）

我暂时的话好像只用过这两种，不知道大家还有其他什么更好的方法，欢迎分享~

配置项

可以给 <ly-tab></ly-tab> 组件传入一些配置项以自定义你想要的效果

配置项	类型	描述	默认值
lineWidth	Number	fixBottom为false时tabbar底部border-width	1px
activeColor	String	激活状态下字体color以及border-bottom-color	red
fixBottom	Boolean	是否固定在视图底部（为false时不可滑动）	false
additionalX	Number	近似等于超出边界时最大可拖动距离	50px
reBoundExponent	Number	惯性回弹指数(值越大，幅度越大，惯性回弹距离越长)	10
sensitivity	Number	惯性滑动时的灵敏度(值越小，阻力越大),可近似认为手松开后速度减为零所需时间	1000ms
reBoundingDuration	Number	回弹动画duration	360ms

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