Wechat applet custom TAB

1. Component encapsulation

Swiper and Swiper-item components provided by wechat are used to realize monitoring the change of swiper to change options, and also monitoring the change of options to change the current swiper, two-way monitoring two-way change

wxml

<view class="weui-tabs"> <! - options - ><view class="weui-tabs-bar__wrp" id="weui-tabs-bar__wrp">
    <scroll-view scroll-x scroll-into-view="item_{{currentView}}" scroll-with-animation="{{animation}}">
      <view class="weui-tabs-bar__content">
        <block wx:for="{{tabs}}" wx:key="title">
          <view id="item_{{index}}" class="weui-tabs-bar__item" style="background-color: {{tabBackgroundColor}}; color: {{activeTab === index ? tabActiveTextColor : tabInactiveTextColor}};" bindtap="handleTabClick" data-index="{{index}}">
            <view class="weui-tabs-bar__title {{tabClass}} {{activeTab === index ? activeClass : ''}}" style="border-bottom-color: {{activeTab === index ? tabUnderlineColor : 'transparent'}}">
              <text class="">{{item.title}}</text>
            </view>
          </view>
        </block>
      </view>
    </scroll-view>
  </view><! - content - ><swiper class="{{swiperClass}}" current="{{activeTab}}" duration="{{duration}}" bindchange="handleSwiperChange">
    <swiper-item wx:for="{{tabs}}" wx:key="title">
      <slot name="tab-content-{{index}}"></slot>
    </swiper-item>
  </swiper>
</view>
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js

Component({
  options: {
    addGlobalClass: true.pureDataPattern: / / ^ _,
    multipleSlots: true
  },
  properties: {
    tabs: { type: Array.value: []},// Data item format {title:" option 1 "}
    tabClass: { type: String.value: ' ' },// Tabbed style
    swiperClass: { type: String.value: ' ' },// The content area swiper style
    activeClass: { type: String.value: ' ' },// Class when the option is enabled
    tabUnderlineColor: { type: String.value: '#07c160' },// Activate the underline color
    tabActiveTextColor: { type: String.value: '# 000000' },// Activate text color
    tabInactiveTextColor: { type: String.value: '# 000000' },// Unselected text color
    tabBackgroundColor: { type: String.value: '#ffffff' },// TAB background color
    activeTab: { type: Number.value: 0 },// The TAB is currently activated
    animation: { type: Boolean.value: true },// Whether to use animation
    duration: { type: Number.value: 500 }// Animation transition time
  },
  data: {
    currentView: 0
  },
  observers: {
    activeTab(_activeTab) {
      var len = this.data.tabs.length;
      if (len === 0) return;
      var currentView = _activeTab - 1;
      if (currentView < 0) currentView = 0;
      if (currentView > len - 1) currentView = len - 1;
      this.setData({ currentView: currentView }); }},methods: {
    handleTabClick(e) {
      var index = e.currentTarget.dataset.index;
      this.setData({ activeTab: index });
      this.triggerEvent('tabclick', { index: index });
    },
    handleSwiperChange(e) {
      var index = e.detail.current;
      this.setData({ activeTab: index });
      this.triggerEvent('change', { index: index }); }}});Copy the code

wxss

.weui-tabs{
  width:100%
}
.weui-tabs-bar__wrp{
  width:100%;
  background:#fff;
}
.weui-tabs-bar__content{
  width:100%;
  white-space:nowrap;
}
.weui-tabs-bar__item{
  display:inline-block;
}
.weui-tabs-bar__title{
  display:inline-block;
  border-bottom-width:2px;
  border-bottom-style:solid;
  border-bottom-color:transparent;
  padding-bottom: 4px;
  margin: 0 10px;
  color: rgba(0.0.0.0.9);
}
.tab-bar-title__selected{
  font-size: 20px;
  font-weight: bold;
}
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json

{
    "component": true."usingComponents": {}}Copy the code

2, use,

json

{
  "usingComponents": {
    "tab":"/com/tabs/index"}}Copy the code

wxml

<view class="page">
  <tab tabs="{{tabs}}" activeTab="{{activeTab}}" swiperClass="weui-tabs-swiper" bindtabclick="onTabClick" bindchange="onChange" activeClass="tab-bar-title__selected">
    <view class="tab-content" slot="tab-content-0">Option a</view>
    <view class="tab-content" slot="tab-content-1">Option 2</view>
    <view class="tab-content" slot="tab-content-2">Option three</view>
    <view class="tab-content" slot="tab-content-3">Four options</view>
    <view class="tab-content" slot="tab-content-4">Five options</view>
    <view class="tab-content" slot="tab-content-5">Option six</view>
    <view class="tab-content" slot="tab-content-6">Seven options</view>
  </tab>
</view>
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js

Page({
  data: {
    tabs: [].activeTab: 0,
  },

  onLoad () {
    const tabs = [
      { title: 'Option one'}, {title: 'Option two'}, {title: 'Option three'}, {title: 'Option four'}, {title: 'Option five'}, {title: 'Option six'}, {title: 'Option seven',},]this.setData({ tabs })
  },

  onTabClick (e) {
    this.setData({ activeTab: e.detail.index })
  },

  onChange (e) {
    this.setData({ activeTab: e.detail.index })
  },
})
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wxss

.weui-tabs-swiper{
  height: calc(100vh - 76rpx);
}
.tab-content{
  width: 100%;
  height: 100%;
  overflow: scroll;
}
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Effect of 3,