在微信小程序里面没有DOM对象, 不能操作DOM. 所有的操作通过数据来实现，下面主要实现了给循环列表点击添加类的操作
一、单项
目标需求：实现下图，给点击的view增加类，每次只能选择一个。
主要思路：给点击的view增加类，依靠点击的index对state进行赋值。如果相同时，给该view增加类。
实现代码：
.wxml文件
<view>
<view class='appointent-date'>
<view class="appointent-date-div {{state==index?'active-tag':''}}" bindtap="select_date" wx:for="{{dates}}" data-key='{{index}}'>
<view class="flex-item" >
<rich-text class='data_name'>{{item.data_name}}</rich-text>
<rich-text>{{item.name}}</rich-text>
</view>
</view>
</view>
</view>
.wxss文件
.appointent-date-div{
display:inline-block;
width:20%;
text-align: center;
margin-top: 30rpx;
}
.flex-item{
display: inline-block;
width:96rpx;
height: 88rpx;
font-size: 26rpx;
border:2rpx solid #999;
text-align: center;
border-radius: 10rpx;
color: #999;
cursor: pointer;
line-height: 30rpx;
}
.data_name{
font-size: 36rpx;
line-height: 52rpx;
}
.active-tag .flex-item{
background: #c8321e;
color:#fff;
border:1rpx solid #fff;
}
.js文件
Page({
/**
* 页面的初始数据
*/
data: {
dates: [
{ "data_name": "30", "name": "十三"},
{ "data_name": "1", "name": "十四"},
{ "data_name": "2", "name": "十五"},
{ "data_name": "3", "name": "十六"},
{ "data_name": "4", "name": "十七"},
{ "data_name": "5", "name": "十八"},
{ "data_name": "6", "name": "十九"},
{ "data_name": "7", "name": "二十"},
{ "data_name": "8", "name": "廿一"},
{ "data_name": "9", "name": "廿二"},
{ "data_name": "10", "name": "廿三"},
{ "data_name": "11", "name": "廿四"},
{ "data_name": "12", "name": "廿五"},
{ "data_name": "13", "name": "廿六"},
{ "data_name": "14", "name": "廿七"}
],
state:''
},
//选择日期后加样式
select_date: function (e) {
this.setData({
state: e.currentTarget.dataset.key,
});
},
})
二，多项
目标需求：实现下图，给点击的view增加类，再次点击时取消，可以多项选择。
主要思路：
给dates数组增加一个属性state, 1表示状态选中,0表示未选中，每次点击时修改state的值。
实现代码：
.wxml文件
<view class='appointent-date'>
<view class="appointent-date-div {{item.state==1?'active-tag':''}}" bindtap="select_date" wx:for="{{dates}}" data-key='{{index}}'>
<view class="flex-item" >
<rich-text class='data_name'>{{item.data_name}}</rich-text>
<rich-text>{{item.name}}</rich-text>
</view>
</view>
</view>
.wxss文件
.appointent-date{
padding:10rpx 30rpx 40rpx 30rpx;
background: #fff;
box-sizing: border-box;
}
.appointent-date-div{
display:inline-block;
width:20%;
text-align: center;
margin-top: 30rpx;
}
.flex-item{
display: inline-block;
width:96rpx;
height: 88rpx;
font-size: 26rpx;
border:2rpx solid #999;
text-align: center;
border-radius: 10rpx;
color: #999;
cursor: pointer;
line-height: 30rpx;
}
.data_name{
font-size: 36rpx;
line-height: 52rpx;
}
.active-tag .flex-item{
background: #c8321e;
color:#fff;
border:1rpx solid #fff;
}
.js文件
Page({
/**
* 页面的初始数据
*/
data: {
dates: [
{ "data_name": "30", "name": "十三", "state": 0 },
{ "data_name": "1", "name": "十四", "state": 0 },
{ "data_name": "2", "name": "十五", "state": 0 },
{ "data_name": "3", "name": "十六", "state": 0 },
{ "data_name": "4", "name": "十七", "state": 0 },
{ "data_name": "5", "name": "十八", "state": 0 },
{ "data_name": "6", "name": "十九", "state": 0 },
{ "data_name": "7", "name": "二十", "state": 0 },
{ "data_name": "8", "name": "廿一", "state": 0 },
{ "data_name": "9", "name": "廿二", "state": 0 },
{ "data_name": "10", "name": "廿三", "state": 0 },
{ "data_name": "11", "name": "廿四", "state": 0 },
{ "data_name": "12", "name": "廿五", "state": 0 },
{ "data_name": "13", "name": "廿六", "state": 0 },
{ "data_name": "14", "name": "廿七", "state": 0 }
]
},
//选择日期后加样式
select_date: function (e) {
var index = e.currentTarget.dataset.key;
if (this.data.dates[index].state == 1) {
this.data.dates[index].state = 0;
} else if (this.data.dates[index].state == 0) {
this.data.dates[index].state = 1;
}
this.setData({
dates: this.data.dates,
});
},
})