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微信小程序 实现列表项滑动显示删除按钮的功能
微信小程序并没有提供列表控件，所以也没有iOS上惯用的列表项左滑删除的功能，SO只能自己干了。
原理很简单，用2个层，上面的层显示正常的内容，下面的层显示一个删除按钮，就是记录手指滑动的距离，动态的来移动上层元素，当然上层用绝对定位。
wxml：
<view class="container">
<view class="record-box" data-datetime="{{record.datetime}}" wx:for="{{detailList}}" wx:for-item="record">
<view class="record" style="left:{{record.offsetX}}px" bindtouchstart="recordStart" catchtouchmove="recordMove" bindtouchend="recordEnd">
<view class="left">
<view>{{record.type}} {{record.count+record.unit}}</view>
<view class="summary">{{record.remark}}</view>
</view>
<view class="right">
{{record.datetime}}
</view>
</view>
<view class="delete-box">
<view>删除</view>
</view>
</view>
</view>
</div>
wxss：
@import "../common/weui.wxss";
.container {
box-sizing: border-box;
padding: 0 0 0 0;
}
.record {
display: flex;
flex-direction: row;
align-items: center;
width:100%;
height: 120rpx;
position: absolute;
justify-content: space-between;
background-color: #fff;
}
.record .right{
margin-right: 30rpx;
color: #888888;
}
.record .left{
margin-left: 30rpx;
display: flex;
flex-direction: column;
justify-content: space-between;
}
.record .left .summary{
color: #aaa;
font-size: 30rpx;
line-height: 30rpx;
}
.record-box{
height: 120rpx;
width: 100%;
border-bottom: 1rpx solid #ddd;
background-color: #fff;
}
.delete-box{
background-color: #e64340;
color: #ffffff;
float: right;
height: 100%;
width: 80px;
display: flex;
align-items: center;
justify-content: center;
}
.record-box:last-child {
border-bottom: 0;
}
.record .r-item {
}
</div>
JS代码：
var detailList = [
{ datetime: '2017-01-01 17:00', count: 100, unit: 'ml', type: '开水', remark: '哈哈哈哈' },
{ datetime: '2017-01-01 17:01', count: 100, unit: 'ml', type: '开水' },
{ datetime: '2017-01-01 17:02', count: 100, unit: 'ml', type: '开水' }
];
var recordStartX = 0;
var currentOffsetX = 0;
Page(
{
data: {
detailList: detailList
}
,
recordStart: function (e) {
recordStartX = e.touches[0].clientX;
currentOffsetX = this.data.detailList[0].offsetX;
console.log('start x ', recordStartX);
}
,
recordMove: function (e) {
var detailList = this.data.detailList;
var item = detailList[0];
var x = e.touches[0].clientX;
var mx = recordStartX - x;
console.log('move x ', mx);
var result = currentOffsetX - mx;
if (result >= -80 && result <= 0) {
item.offsetX = result;
}
this.setData({
detailList: detailList
});
}
,
recordEnd: function (e) {
var detailList = this.data.detailList;
var item = detailList[0];
console.log('end x ', item.offsetX);
if (item.offsetX < -40) {
item.offsetX = -80;
} else {
item.offsetX = 0;
}
this.setData({
detailList: detailList
});
}
}
);
</div>
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</div>