微信小程序实现拖拽功能

<viewclass='collectBox'bindtap='addCollect'wx:if="{{write[0]+write[1]>0}}"bindtouchmove="touchmove"catch:touchmove

<view class='collectBox' 
 bindtap='addCollect' 
 wx:if="{{write[0]+write[1] > 0}}" 
 bindtouchmove="touchmove" 
 catch:touchmove 
 style="left:{{write[0]}}px;top:{{write[1]}}px;">
 <image src='../../images/icon/addcollect.png'></image>
</view>

// pages/cateDetaile/cateDetaile.js
const app = getApp()
Page({
 
 /**
 * 页面的初始数据
 */
 data: {
 // 拖拽参数
 writePosition: [80, 90], //默认定位参数
 writesize: [0, 0],// X Y 定位
 window: [0, 0], //屏幕尺寸
 write: [0, 0], //定位参数
 scrolltop: 0,//据顶部距离
 },
 
 /**
 * 生命周期函数--监听页面加载
 */
 onLoad: function (options) {
 // 在页面中定义插屏广告
 let that = this;
 that.getSysdata();
 },
 //计算默认定位值
 getSysdata: function () {
 var that = this;
 wx.getSystemInfo({
 success: function (e) {
 that.data.window = [e.windowWidth, e.windowHeight];
 var write = [];
 write[0] = that.data.window[0] * that.data.writePosition[0] / 100;
 write[1] = that.data.window[1] * that.data.writePosition[1] / 100;
 console.log(write,45)
 that.setData({
 write: write
 }, function () {
 // 获取元素宽高
 wx.createSelectorQuery().select('.collectBox').boundingClientRect(function (res) {
 console.log(res.width)
 that.data.writesize = [res.width, res.height];
 }).exec();
 })
 },
 fail: function (e) {
 console.log(e)
 }
 });
 },
 //开始拖拽 
 touchmove: function (e) {
 var that = this;
 var position = [e.touches[0].pageX - that.data.writesize[0] / 2, e.touches[0].pageY - that.data.writesize[1] / 2 - this.data.scrolltop];
 that.setData({
 write: position
 });
 },
 onPageScroll(e) {
 this.data.scrolltop = e.scrollTop;
 },
})

总结

以上所述是小编给大家介绍的微信小程序实现拖拽功能,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！ 如果你觉得本文对你有帮助，欢迎转载，烦请注明出处，谢谢！