js中如何拖动DIV中的图片？

2023-03-05 08:58:02JavaScript011

js中如何拖动DIV中的图片？,第1张

实现思路：

①鼠标按下+鼠标移动 → 拖拽

②鼠标松开 → 无拖拽

③鼠标偏移 → 拖拽距离

用JavaScript事件方法表示就是：

① onmousedown + onmousemove → startDrag()

② onmouseup → stopDrag()

drag.js代码：

var params = {

left: 0,

top: 0,

currentX: 0,

currentY: 0,

flag: false

}

//获取相关CSS属性

var getCss = function(o,key){

return o.currentStyle? o.currentStyle[key] : document.defaultView.getComputedStyle(o,false)[key]

}

//拖拽的实现

var startDrag = function(bar, target, callback){

if(getCss(target, "left") !== "auto"){

params.left = getCss(target, "left")

}

if(getCss(target, "top") !== "auto"){

params.top = getCss(target, "top")

}

//o是移动对象

bar.onmousedown = function(event){

params.flag = true

if(!event){

event = window.event

//防止IE文字选中

bar.onselectstart = function(){

return false

}

var e = event

params.currentX = e.clientX

params.currentY = e.clientY

}

document.onmouseup = function(){

params.flag = false

if(getCss(target, "left") !== "auto"){

params.left = getCss(target, "left")

}

if(getCss(target, "top") !== "auto"){

params.top = getCss(target, "top")

}

document.onmousemove = function(event){

var e = event ? event: window.event

if(params.flag){

var nowX = e.clientX, nowY = e.clientY

var disX = nowX - params.currentX, disY = nowY - params.currentY

target.style.left = parseInt(params.left) + disX + "px"

target.style.top = parseInt(params.top) + disY + "px"

}

if (typeof callback == "function") {

callback(parseInt(params.left) + disX, parseInt(params.top) + disY)

}

HTML/CSS

#box{position:absolute left:100px top:100px padding:5px background:#f0f3f9 font-size:12px -moz-box-shadow:2px 2px 4px #666666 -webkit-box-shadow:2px 2px 4px #666666}

#main{border:1px solid #a0b3d6 background:white}

#bar{line-height:24px background:#beceeb border-bottom:1px solid #a0b3d6 padding-left:5px cursor:move}

#content{width:420px height:250px padding:10px 5px}

</style>

内容……

</div>

JS部分

var oBox = document.getElementById("box")

var oBar = document.getElementById("bar")

startDrag(oBar, oBox)

</script>

不是很简单一两句话能说清楚地，需要HTML, CSS和javascript的配合。我大概说下做法，你需要自己写写试试看

首先把你的div设置style为overflow hidden

然后在div里面再添加一个div，假设叫做imgcontainer，在里面存放所有图片，图片以float: left方式显示，每个图片的宽度你是知道的，这样图片的个数*每个图片的宽度（必要的话再加上图片之间的间隔）设置为imgcontainer的总宽度。然后把div的宽度设置为显示3个图片的宽度。这样就可以保证只显示3个图片，多余的图片看不到。

然后在点击左右2个按钮的时候添加事件，每点击一次，让imgcontainer的marginLeft增加或减少一个图片的宽度（同样必要的时候加上图片之间的间隔距离），这样就使得图片列表在左右移动了。

下面是我的一个例子，跟你的需求可能不完全一样，大概做下参考：

HTML片段

<li><figure onclick="ViewPhoto(this,'aaaaa')"><div class="samplecontainer"><img src="./img/singularity.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">aaaaa</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'bbbbb')"><div class="samplecontainer"><img src="./img/pyre.jpg" onload="DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">bbbbb</figcaption></figure></li>

</ol>

</div>

</div>

CSS部分

.photolist_container {

margin: 0

/*Firefox*/

width: -moz-calc(100% - 30px)

/*chrome safari*/

width: -webkit-calc(100% - 30px)

/*Standard */

width: calc(100% - 30px)

float: left

height: 140px

overflow: hidden

}

ol.photolist {

background-color: black

margin: 0

margin-left: 1px

padding: 0

list-style: none

height: auto

padding: 0

display: block

height: 125px

}

ol.photolist>li {

margin: 0

margin-left: -1px

padding: 4px

text-align:center

display:inline

float: left

border: 1px solid #FF6699

width: 100px

}

#photolist figure {

margin: 0

padding: 0

text-align:center

border: 1px solid #000000

cursor: pointer

}

.samplecontainer {

height: 100px

width: 100px

text-align: center

margin: 0

padding: 0

border: 0

display: table-cell

vertical-align: middle

}

.samplecontainer>img {

margin: 0

padding: 0

border: 0

vertical-align:middle

}

Javascript部分

function MovePhotoList(size) {

var photolist = document.getElementById("photolist")

var marginLeft = 1

if (photolist.style.marginLeft != "")

marginLeft = parseInt(photolist.style.marginLeft)

marginLeft = marginLeft + size

if (marginLeft <(document.getElementById("photolist_container").offsetWidth - photolist.offsetWidth))

{

marginLeft = document.getElementById("photolist_container").offsetWidth - photolist.offsetWidth

document.getElementById("nav_thumbs_next").setAttribute("class", "disabled")

}

else

{

document.getElementById("nav_thumbs_next").setAttribute("class", "enable")

}

if (marginLeft >1)

{

marginLeft = 1

document.getElementById("nav_thumbs_prev").setAttribute("class", "disabled")

}

else

{

document.getElementById("nav_thumbs_prev").setAttribute("class", "enable")

}

photolist.style.marginLeft = marginLeft + "px"

}

function NavThumbsPrev() {

var nav_thumbs_prev = document.getElementById("nav_thumbs_prev")

if (nav_thumbs_prev.getAttribute("class") != "disabled") {

MovePhotoList(56)

}

function NavThumbsNext() {

var nav_thumbs_next = document.getElementById("nav_thumbs_next")

if (nav_thumbs_next.getAttribute("class") != "disabled") {

MovePhotoList(-56)

}

这段代码可以： <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns=" http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/htmlcharset=gb2312" /><title>图片</title><script language="javascript"></script><style type="text/css"></style></head><body><DIV class=blk_18><A onmouseup=ISL_StopUp_1() class=LeftBotton onmousedown=ISL_GoUp_1() onmouseout=ISL_StopUp_1() href="javascript:void(0)" target=_self></A><DIV class=pcont id=ISL_Cont_1><DIV class=ScrCont><DIV id=List1_1><A class=pl href=" http://info.china.alibaba.com/news/detail/v3000103-d1002527920.html" target=_blank><IMG height=72 alt=20-50元夏装抢疯 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>美女小凡最新夏装</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v5000180-d1002468482.html" target=_blank><IMG height=72 alt=韩国人气小耳环 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>韩国人气小耳环</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v9-d1002531301.html" target=_blank><IMG height=72 alt=3万6超值装修88平 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>3万6超值装修88平</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v8-d1002530067.html" target=_blank><IMG height=72 alt=牛干巴敲开财富门 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>牛干巴敲开财富门</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v5003519-d1002285304.html" target=_blank><IMG height=72 alt=4K至7K高性能本本 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>4K至7K高性能本本</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v5001800-d1002511645.html" target=_blank><IMG height=72 alt=7万装修102平婚房 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>7万装修102平婚房</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v5003463-d1002527336.html" target=_blank><IMG height=72 alt=最新小车节油为主 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>最新小车节油为主</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v5003000-d1002505656.html" target=_blank><IMG height=72 alt="热门项目 BT烤翅" src=" http://www.baidu.com/img/baidu_logo.gif" width=96>热门项目 BT烤翅</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v3000103-d1002421590.html" target=_blank><IMG height=72 alt=流行T恤+裤装 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>要显瘦就这么穿！</A></DIV><DIV id=List2_1></DIV></DIV></DIV><A onmouseup=ISL_StopDown_1() class=RightBotton onmousedown=ISL_GoDown_1() onmouseout=ISL_StopDown_1() href="javascript:void(0)" target=_self></A></DIV><SCRIPT type=text/javascript></SCRIPT></body></html>

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