JQuery+drag.js上传图片并且实现图片拖曳
作者：一往而深のcode
这篇文章主要介绍了JQuery+drag.js上传图片并且实现图片拖曳,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
外层的容器的id属性应为'container'
容器中有多个队列，这些队列之间可以随意拖动，class属性应为'queue'
队列中有多个拖动块，class属性应为'dragger'
把拖动块拖到队列的尾部空白处会使这个拖动块加到队列尾部
1.html部分：
<tr>
<td><span class="colorred">* </span>商品展示图片：</td>
<td style="padding:20px 20px 20px 0">
<div id="container11" style="padding:20px 0; border: 1px #ededed solid;">
<ul class="shop_imgs queue" style="width: 746px; height: 100px;">
<li class="dragger" data-id="1">
<input type="file" name="files[]" class="qy_yyzz1 f" onchange="handleFiles(this.files,this.parentNode)">
</li>
<li class="dragger" data-id="2"> <input type="file" name="files[]" class="qy_yyzz2 f" onchange="handleFiles(this.files,this.parentNode)">
</li>
<li class="dragger" data-id="3"> <input type="file" name="files[]" class="qy_yyzz3 f" onchange="handleFiles(this.files,this.parentNode)">
</li>
<li class="dragger" data-id="4"> <input type="file" name="files[]" class="qy_yyzz4 f" onchange="handleFiles(this.files,this.parentNode)">
</li>
<li class="dragger" data-id="5"> <input type="file" name="files[]" class="qy_yyzz5 f" onchange="handleFiles(this.files,this.parentNode)">
</li>
</ul>
</div>
</td>
</tr>
js部分:
<script type="text/javascript" src="jquery-1.9.1.min.js"></script>
<script type="text/javascript" src="/drag/drag.js"></script>
<script type="text/javascript" src="/drag/main.js"></script>
//构建预览上传图片的函数，并接收传递过来的2个变量参数
function handleFiles(file, obj) {
var val=file[0].name
if (!/.(gif|jpg|jpeg|png|GIF|JPG|bmp)$/.test(val)) {
layer.msg('图片类型必须是.gif,jpeg,jpg,png,bmp中的一种', {icon: 0,time: 2000, title: '提示'});
return false;
}
//获取当前点击的元素的所有同级元素的html内容
var con = obj.innerHTML;
//判断当前点击元素内是否已经存在img图片元素，如果有则先全部清除后再添加，如果没有就直接添加
if (con.indexOf("img") > 0) {
var pic = obj.getElementsByTagName("img");
for (var i = 0; i < pic.length; i++) {
obj.removeChild(pic[i]);
}
//调用添加img图片的函数
creatImg();
} else {
creatImg();
}
function creatImg() {
//创建一个img元素
var img = document.createElement("img");
// 创建一个删除img
var del =document.createElement("span")
//设置img元素的源文件路径，window.URL.createObjectURL() 方法会根据传入的参数创建一个指向该参数对象的URL. 这个URL的生命仅存在于它被创建的这个文档里
img.src = window.URL.createObjectURL(file[0]);
//window.URL.revokeObjectURL() 释放一个通过URL.createObjectURL()创建的对象URL，在图片被显示出来后，我们就不再需要再次使用这个URL了，因此必须要在加载后释放它
img.onload = function () {
window.URL.revokeObjectURL(this.src);
}
//在当前点击的input元素后添加刚刚创建的img图片元素
obj.appendChild(img);
obj.appendChild(del);
}
// 删除图片
$(".shop_imgs li span").bind("click",function(){
$(this).siblings("input[type='file']").val('')
$(this).siblings('img').remove()
$(this).remove()
});
}
// 图片禁止拖拽
$('.shop_imgs li').on('mousedown',function (e) {
e.preventDefault()
css部分:
.div1-table tr {
width: 100%;
height: 68px;
line-height: 68px;
border-bottom: 1px solid #eaeaea;
}
.div1-table tr td:first-child {
padding-left: 30px;
width: 16%;
}
.shop_imgs {
display: flex;
justify-content: space-around;
margin: 20px 0;
}
.shop_imgs li {
position: relative;
width: 100px;
height: 100px;
background: url(../../images/user/shell/plus_sp_img.jpg) no-repeat center;
text-align: center;
cursor: move;
list-style: none;
}
.shop_imgs input[type="file"] {
position: absolute;
left: 0;
bottom: 0;
/* z-index: 3; */
display: inline-block;
width: 100%;
height: 100%;
cursor: pointer;
border: none;
opacity: 0;
padding-left: 10px;
}
.shop_imgs li span {
position: absolute;
right: 6px;
top: 7px;
width: 23px;
height: 23px;
background: url(../../images/close.png) no-repeat center;
background-size: 100%;
cursor: pointer;
}
.shop_imgs li img {
position: absolute;
top: 10px;
left: 10px;
width: 80px;
height: 80px;
}
main.js:
// main.js里面的内容是调用:
(function(){registerDrag($('#container11'));})();
drag.js:
var queueArr = []; var draggers = []; var isDragging = false; var isMouseDown = false; var dragger = null; var mouseX; var mouseY; var draggerLeft; var draggerTop; var clone = null; var DRAG_THRESHOLD = 5; var queueContainer; var queueActive = { }; var queueUnActive = { }; var registerDrag = function (container) {
queueContainer = container; $.each(container.find('.queue'), function (index, value) { queueArr[index] = $(value); draggers[index] = []; elements = $(value).find('.dragger'); $.each(elements, function (_index, _value) { draggers[index][_index] = $(_value); }); }); for (var i = 0; i < draggers.length; i++)
for (var j = 0; j < draggers[i].length; j++) { draggers[i][j].on('mousedown', dragStart); }
$(document).on('mousemove', dragMove); $(document).on('mouseup', dragEnd);
}
var dragStart = function (e) { e.stopPropagation(); isMouseDown = true; mouseX = e.clientX; mouseY = e.clientY; dragger = $(this); }
var dragMove = function (e) { e.stopPropagation(); if (!isMouseDown) return; var dx = e.clientX - mouseX; var dy = e.clientY - mouseY; if (isDragging) { clone.css({ left: draggerLeft + dx, top: draggerTop + dy }); arrangeDragger(); } else if (Math.abs(dx) > DRAG_THRESHOLD || Math.abs(dy) > DRAG_THRESHOLD) { clone = makeClone(dragger); draggerLeft = dragger.offset().left - parseInt(dragger.css('margin-left')) - parseInt(dragger.css('padding-left')); draggerTop = dragger.offset().top - parseInt(dragger.css('margin-top')) - parseInt(dragger.css('padding-top')); clone.css({ left: draggerLeft, top: draggerTop }); queueContainer.append(clone); dragger.css('visibility', 'hidden'); isDragging = true; } }
var dragEnd = function (e) {
e.stopPropagation(); if (isDragging) { isDragging = false; clone.remove(); dragger.css('visibility', 'visible'); }
for (var i = 0; i < queueArr.length; i++)
queueArr[i].css(queueUnActive); isMouseDown = false;
}
// 复制出来移动的图片的样式
var makeClone = function (source) { var res = source.clone(); res.addClass('cloneimg');res.children('img').attr('src','/static/index/images/user/shell/tuozhuai.png');res.css({ position: 'absolute', 'z-index': 100000 }); return res; }
var arrangeDragger = function () {
for (var i = 0; i < queueArr.length; i++)
queueArr[i].css(queueUnActive); var queueIn = findQueue(); if (queueIn != -1)
queueArr[queueIn].css(queueActive); var hover = findHover(queueIn); if (hover == null)
return; var _hover = hover.hover; var _insert = hover.insert; var queueIdOriginal, drggerIdOriginal; var queueIdHover, drggerIdHover; for (var i = 0; i < draggers.length; i++)
for (var j = 0; j < draggers[i].length; j++) { if (draggers[i][j][0] == dragger[0]) { queueIdOriginal = i; drggerIdOriginal = j; } }
draggers[queueIdOriginal].splice(drggerIdOriginal, 1); if (_hover) {
for (var i = 0; i < draggers.length; i++)
for (var j = 0; j < draggers[i].length; j++) { if (_hover && draggers[i][j][0] == _hover[0]) { queueIdHover = i; drggerIdHover = j; } }
if (_insert == 'left') { _hover.before(dragger); draggers[queueIdHover].splice(drggerIdHover, 0, dragger); }
else { _hover.after(dragger); draggers[queueIdHover].splice(drggerIdHover + 1, 0, dragger); }
} else { draggers[queueIn].push(dragger); queueArr[queueIn].append(dragger); }
// console.log('******************'); for (var i = 0; i < draggers.length; i++)
// for (var j = 0; j < draggers[i].length; j++)
// console.log(draggers[i][j][0]); console.log('******************');
}
var findQueue = function () {
var mx = -1, pos = -1; var cloneTop = clone.offset().top; var cloneHeight = clone.height(); for (var i = 0; i < queueArr.length; i++) { var queueTop = queueArr[i].offset().top; var queueHeight = queueArr[i].height(); var val = Math.min(queueTop + queueHeight, cloneTop + cloneHeight) - Math.max(queueTop, cloneTop); if (val > mx) { mx = val; pos = i; } }
return pos;
}
var findHover = function (queueIn) {
if (queueIn == -1)
return null; var mx = -1, pos = null; var cloneTop = clone.offset().top; var cloneHeight = clone.height(); var cloneLeft = clone.offset().left; var cloneWidth = clone.width(); var isOwn = false; for (var i = 0; i < draggers[queueIn].length; i++) {
var _draggerTop = draggers[queueIn][i].offset().top; var _draggerHeight = draggers[queueIn][i].height(); var vertical = Math.min(_draggerTop + _draggerHeight, cloneTop + cloneHeight) - Math.max(_draggerTop, cloneTop); var _draggerLeft = draggers[queueIn][i].offset().left; var _draggerWidth = draggers[queueIn][i].width(); var horizontal = Math.min(_draggerLeft + _draggerWidth, cloneLeft + cloneWidth) - Math.max(_draggerLeft, cloneLeft); if (vertical <= 0 || horizontal <= 0) continue; var s = vertical * horizontal; if (s <= cloneHeight * cloneWidth / 3)
continue; if (draggers[queueIn][i][0] == dragger[0]) { isOwn = true; continue; }
if (s > mx) { mx = s; pos = draggers[queueIn][i]; }
}
if (mx < 0) {
if (isOwn) return null; if (draggers[queueIn].length == 0) { return { 'hover': null }; } else {
var last, index = draggers[queueIn].length - 1; while (index >= 0 && draggers[queueIn][index][0] == dragger[0])
index--; if (index >= 0)
last = draggers[queueIn][index]; else
return { 'hover': null }; if (cloneLeft >= last.offset().left + last.width())
return { 'hover': last, 'insert': 'right' }; else
return null;
}
}
else {
var posMid = (2 * pos.offset().left + pos.width()) / 2; var cloneMid = (2 * clone.offset().left + clone.width()) / 2; if (posMid > cloneMid)
return { 'hover': pos, 'insert': 'left' }; else
return { 'hover': pos, 'insert': 'right' };
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。