原生JavaScript实现拖拽效果
2014.07.12
JerryC
搬砖码农
热度
℃
前言
闲着无事干，突然想做一个类Q+ Web桌面的东西，当然那是一个大工程（对本菜鸟来说）。那么，这个Demo就是第一步，起码可以实现图标的拖拽效果。
截图：
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
| <!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>Drag Demo</title>
<style>
body{
background:url(images/bg.jpg) no-repeat;
background-size:100%;
padding: 20px ;
}
.icon{
width: 100px;height: 100px;margin-bottom:15px;position: absolute;cursor: move;
}
.icon-0{
background: url("images/png/0.png") no-repeat;background-size: 100%;
top: 20px;
left: 20px;
}
.icon-1{
background: url("images/png/1.png") no-repeat;background-size: 100%;
top: 140px;
left: 20px;
}
.icon-2{
background: url("images/png/2.png") no-repeat;background-size: 100%;
top: 260px;
left: 20px;
}
.icon-3{
background: url("images/png/3.png") no-repeat;background-size: 100%;
top: 380px;
left: 20px;
}
.icon-4{
background: url("images/png/4.png") no-repeat;background-size: 100%;
top: 500px;
left: 20px;
}
</style>
</head>
<body>
<div class="icon icon-0"></div>
<div class="icon icon-1"></div>
<div class="icon icon-2"></div>
<div class="icon icon-3"></div>
<div class="icon icon-4"></div>
</body>
<script type="text/javascript">
function g(el){ return document.getElementsByClassName(el);}
var icons = g('icon');
var instace = false;
for(var i =0 ; i<icons.length ; i++){
if(icons[i]) {
icons[i].addEventListener('mousedown', function (e) {
instace = {};
var e = e || window.event;
var el = e.toElement || e.target;
console.log(e);
instace.moveElement = el;
var mouseX = e.pageX;
var mouseY = e.pageY;
var elX = el.offsetLeft;
var elY = el.offsetTop;
instace.offSetX = mouseX - elX;
instace.offSetY = mouseY - elY;
instace.moveElement.style.zIndex = 9000;
});
}
}
document.onmouseup = function(e){
instace.moveElement.style.zIndex = 2;
instace = false;
};
document.onmousemove = function(e){
if(instace){
var mouseX = e.pageX;
var mouseY = e.pageY;
var moveX = mouseX - instace.offSetX;
var moveY = mouseY - instace.offSetY;
var maxX = document.documentElement.clientWidth - instace.moveElement.offsetWidth;
var maxY = document.documentElement.clientHeight - instace.moveElement.offsetHeight;
instace.moveElement.style.left = Math.max(0,Math.min(maxX,moveX)) + 'px';
instace.moveElement.style.top = Math.max(0,Math.min(maxY,moveY)) + 'px';
}
};
</script>
</html>
|
演示地址：http://jerryc8080.github.io/dragDemo/
项目地址：https://github.com/JerryC8080/dragDemo/
