Various ways of WeChat applet to realize item click color change

1: wxs implements multiple item clicks to change color and keeps the same as before

Renderings:

Idea 1: for loop rendering item

           Add an active tag to the clicked element

           Multiple elements use wxs syntax to determine whether there is a clicked index in the active label array

                Idea 2: If only one element is allowed to change color at the same time, there is no need to use wxs to directly put { {utility.isActive(salaryState,index)}}

Change to { { state == index? 'active':' '}}

Idea 3: If you only need to change color temporarily on the basis of 2, use WeChat: hover syntax

wxml：

<view class="salary">
    <van-row>
        <van-col span="23" offset="1">期待薪资<van-icon name="arrow-down" /></van-col>
    </van-row>
    <van-row class="tags">
      <van-col span="4" offset="{
   
   {index%4 == 0 ? 0 : 2}}" wx:for="{
   
   {job_salarys}}" wx:for-item="salary" wx:key="index">
        <view  class="tag {
   
   {utility.isActive(salaryState,index)}}"  data-key="{
   
   {index}}" bindtap="salaryActiveType">
          {
   
   {salary.dictLabel}}
        </view>
      </van-col>
    </van-row>
</view>

wxss：

.salary {
    margin-top: 40rpx;
    padding: 20rpx 40rpx;
}

.tag {
    text-align: center;
    width: 140rpx;
    height: 60rpx;
    line-height: 60rpx;
    margin: 20rpx 20rpx;
    font-size: 24rpx;
    color: #000000;
    background-color: #ffffff;
    border-radius: 14rpx;
    font-weight: bold;
  }

.active-tag {
    background-color: rgb(36, 0, 241);
}

 wxs:

 

<!-- 工具方法 -->
<wxs module="utility">
  function isActive(array,index) {
   if(array.indexOf(index)>-1) {
     return 'active-tag';
   }else {
     return '';
   }
  }

  module.exports.isActive = isActive;
</wxs>

js:

import {getDict} from '../../../../apis/dict';
Page({

    /**
     * 页面的初始数据
     */
    data: {
        job_salarys:[],
        salaryState: []
    },

    getDict(data) {
        getDict(data).then((res)=>{
            console.log(res);
            let that = this;
            if(res.code==200) {
            that.setData({
                job_salarys: res.data
            })
            }
        })
    },

    salaryActiveType(e) {
        let Nowstate = this.data.salaryState
        let key = e.currentTarget.dataset.key
        if (Nowstate.indexOf(key)>-1) {
            Nowstate.splice(Nowstate.indexOf(key), 1)
        }else {
            Nowstate.push(key);
        }
        
        this.setData({
            salaryState: Nowstate
        })
        console.log(this.data.salaryState);
    },

    /**
     * 生命周期函数--监听页面加载
     */
    onLoad(options) {
        this.getDict('job_salary');
    },