WeChat applet implements drag and drop event monitoring examples in detail-Mini Program Development-php.cn

WeChat applet implements drag and drop event monitoring examples in detail

高洛峰

Release： 2017-02-13 10:50:16

Original

2424 people have browsed it

This article mainly introduces the relevant information on the detailed examples of drag and drop event monitoring implemented by WeChat applet. This method is used in the development of many applications or software. Here is an introduction to the implementation of this function by WeChat applet. Friends in need can refer to

WeChat applet drag and drop monitoring function:

When developing software or APP applications, drag and drop monitoring is often encountered. Recently, I have been learning about WeChat mini programs and want to achieve such a drag and drop effect. I will record it here.

I need to make a button that floats on the scroll-view. I tried it.

Upload GIF:

微信小程序实现拖拽事件监听实例详解

There will also be operations similar to moving controls in Android. The idea is similar. Get the X Y variables of the displacement and set the coordinates for the control.

1.index.wxml

../images/gundong.png" bindtap="ballClickEvent" style="bottom:{{ballBottom}}px;right:{{ballRight}}px;" bindtouchmove="ballMoveEvent">  
</image>

Copy after login

Simply set a picture, add touch event listener. Click event listener. Get the X Y displacement according to the touch event and set it to the position of the image

2.index.js

//index.js 
//获取应用实例 
var app = getApp() 
Page({ 
 data: { 
  ballBottom: 240, 
  ballRight: 120, 
  screenHeight: 0, 
  screenWidth: 0, 
 }, 
 onLoad: function () { 
[javascript] view plain copy
<span style="white-space:pre"> </span>//获取屏幕宽高 
  var _this = this; 
  wx.getSystemInfo({ 
   success: function (res) { 
    _this.setData({ 
     screenHeight: res.windowHeight, 
     screenWidth: res.windowWidth, 
    }); 
   } 
  }); 
 }, 
 ballMoveEvent: function (e) { 
  console.log(&#39;我被拖动了....&#39;) 
  var touchs = e.touches[0]; 
  var pageX = touchs.pageX; 
  var pageY = touchs.pageY; 
  console.log(&#39;pageX: &#39; + pageX) 
  console.log(&#39;pageY: &#39; + pageY)

Copy after login

//防止坐标越界,view宽高的一般 
  if (pageX < 30) return; 
  if (pageX > this.data.screenWidth - 30) return; 
  if (this.data.screenHeight - pageY <= 30) return; 
  if (pageY <= 30) return;

Copy after login

//这里用right和bottom.所以需要将pageX pageY转换 
  var x = this.data.screenWidth - pageX - 30; 
  var y = this.data.screenHeight - pageY - 30; 
  console.log(&#39;x: &#39; + x) 
  console.log(&#39;y: &#39; + y) 
  this.setData({ 
   ballBottom: y, 
   ballRight: x 
  }); 
 },

Copy after login

//点击事件 
 ballClickEvent: function () { 
  console.log(&#39;点击了....&#39;) 
 } 
})

Copy after login

3.index.wxss

You need to set z-index## here

.image-style{ 
 position: absolute; 
 bottom: 240px; 
 right: 100px; 
 width: 60px; 
 height: 60px; 
 z-index: 100; 
}

Copy after login

For more detailed examples of WeChat applet implementation of drag and drop event monitoring, please pay attention to the PHP Chinese website for related articles!