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
| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{
margin:0;
padding:0;
}
#ul{
width:1000px;
border:1px solid red;
margin:0 auto;
position: relative;
}
ul,li{
list-style-type: none;
}
#ul>li{
width:200px;
height:200px;
position: absolute;
font-size:60px;
text-align: center;
line-height: 200px;
color:#fff;
cursor: pointer;
user-select: none;
transition: all .5s cubic-bezier(0.395, 1.650, 0.525, 0.745);
}
</style>
</head>
<body>
<ul id="ul">
</ul>
</body>
</html>
<script>
function createLi(){
var oUl = document.querySelector("#ul");
for(let i = 1;i<21;i++){
let tag = document.createElement("li");
let text = document.createTextNode(i);
tag.draggable=true;
tag.appendChild(text);
oUl.appendChild(tag);
}
}
function computedLiPostion(){
var oUl = document.querySelector("#ul");
var oLi = oUl.getElementsByTagName("li");
oUl.style.height = Math.ceil(oLi.length / 5) * oLi[0].offsetHeight+1 + 'px';
var left =0,top=0;
for(var i=0,length = oLi.length;i<length;i++){
const bg = `rgb(${parseInt(Math.random() * 256)},${parseInt(Math.random() * 256)},${parseInt(Math.random() * 256)})`;
oLi[i].style.cssText= `;left:${left}px;top:${top}px;background-color:${bg}`;
left=left+oLi[0].offsetWidth;
if(left >=1000){
left=0;
top+=oLi[0].offsetHeight;
}
}
}
function getStyle(element,attr){
if(element.currentStyle){
return element.currentStyle[attr]
}else{
console.log(window.getComputedStyle(element));
return window.getComputedStyle(element)[attr]
}
}
function changePosition(){
var oUl = document.querySelector("#ul");
var oLi = oUl.getElementsByTagName("li");
for(var i=0,length=oLi.length;i<length;i++){
oLi[i].index= i;
var startIndex=0,endIndex=0;
oLi[i].ondragstart=function(e){
startIndex = this.index;
}
oLi[i].ondragend=function(e){
e.preventDefault();
}
oLi[i].ondragover=function(e){
e.preventDefault();
}
oLi[i].ondrop=function(e){
e.preventDefault();
endIndex = this.index;
for(let j=0,length=oLi.length;j<length;j++){
oLi[j].style.zIndex = 1;
}
let fromX = getStyle(oLi[startIndex],'left');
let fromY = getStyle(oLi[startIndex],'top');
let toX = getStyle(oLi[endIndex],'left');
let toY = getStyle(oLi[endIndex],'top');
oLi[startIndex].style.cssText+=`;z-index:100;left:${toX};top:${toY}`;
oLi[endIndex].style.cssText+=`;z-index:100;left:${fromX};top:${fromY}`;
}
}
}
createLi();
computedLiPostion();
changePosition();
</script>
|
