点击图片弹出缩略图
js代码：
function ImgShow(evt){
var imgTag = (window.event) ? event.srcElement : evt.target;
var imgPath = imgTag.src.replace(/\_\d\./, "_4.");//取得弹出的大图url
var tagTop = Math.max(document.documentElement.scrollTop, document.body.scrollTop);
var tag = document.createElement("div");
tag.style.cssText = "width:100%;height:" + Math.max(document.body.clientHeight, document.body.offsetHeight, document.documentElement.clientHeight) + "px;position:absolute;background:black;top:0;filter: Alpha(Opacity=80);Opacity:0.8;";
tag.ondblclick = closes;
var tagImg = document.createElement("div");
tagImg.style.cssText = "font:12px /18px verdana;overflow:auto;text-align:center;position:absolute;width:200px;border:5px solid white;background:white;color:white;left:" + (parseInt(document.body.offsetWidth) / 2 - 100) + "px;top:" + (document.documentElement.clientHeight / 3 + tagTop) + "px;"
tagImg.innerHTML = "<div style='padding:10px;background:#cccccc;border:1px solid white'><img src='http://www.newxing.com/img/loading.gif' /><br /><br /><b style='color:#999999;font-weight:normal'>Image loading...</b><br /></div>";
tagImg.oncontextmenu = function(){
var clsOK = confirm("确定要取消图片显示吗?点击确定将关闭图片。\n如果您是想缩放图片请在图片上双击。");
if (clsOK) {
closes();
};
return false
};
var closeTag = document.createElement("div");
closeTag.style.cssText = "display:block;position:absolute;left:82%;top:0px;color:black;font-size:18px;";
var closesHtml = "<b style='background:red;border:1px solid white;filter:Alpha(Opacity=50);Opacity:0.5;cursor:pointer;'>关闭</b>";
closeTag.innerHTML = closesHtml + " 提示:双击图片缩放";
closeTag.onclick = closes;
document.body.appendChild(tag);
document.body.appendChild(tagImg);
var img = new Image();
img.src = imgPath;
img.style.cssText = "border:1px solid #cccccc;filter: Alpha(Opacity=0);Opacity:0;cursor:pointer";
var barShow, imgTime;
img.complete ? ImgOK() : img.onload = ImgOK;
function ImgOK(){
var Stop1 = false, Stop2 = false, temp = 0;
var tx = tagImg.offsetWidth, ty = tagImg.offsetHeight;
var ix = img.width, iy = img.height;
var sx = document.documentElement.clientWidth, sy = window.innerHeight || document.documentElement.clientHeight;
if (iy > sy || ix > sx) {
var yy = sy - 100;
var xx = (ix / iy) * yy;
}
else {
var xx = ix + 100;
var yy = iy + 100;
}
img.style.width = xx - 4 + 'px';
img.style.height = yy - 3 + 'px';
if (ix < sx && iy < sy) {
tagImg.alt = "";
closeTag.innerHTML = closesHtml;
};
//closeTag.innerHTML=closesHtml;
var maxTime = setInterval(function(){
temp += 35;
if ((tx + temp) < xx) {
tagImg.style.width = (tx + temp) + "px";
tagImg.style.left = (sx - (tx + temp)) / 2 + "px";
}
else {
Stop1 = true;
tagImg.style.width = xx + "px";
tagImg.style.left = (sx - xx) / 2 + "px";
}
if ((ty + temp) < yy) {
tagImg.style.height = (ty + temp) + "px";
tagImg.style.top = (tagTop + ((sy - (ty + temp)) / 2)) + "px";
}
else {
Stop2 = true;
tagImg.style.height = yy + "px";
tagImg.style.top = (tagTop + ((sy - yy) / 2)) + "px";
}
if (Stop1 && Stop2) {
clearInterval(maxTime);
tagImg.appendChild(img);
temp = 0;
imgOPacity();
}
}, 1);
function imgOPacity(){
temp += 10;
img.style.filter = "alpha(opacity=" + temp + ")";
img.style.opacity = temp / 100;
imgTime = setTimeout(imgOPacity, 1)
if (temp > 100)
clearTimeout(imgTime);
}
tagImg.innerHTML = "";
tagImg.appendChild(closeTag);
if (ix > xx || iy > yy) {
img.alt = "左键拖动,双击放大缩小";
img.ondblclick = function(){
if (tagImg.offsetWidth < img.offsetWidth || tagImg.offsetHeight < img.offsetHeight) {
img.style.width = "auto";
img.style.height = "100%";
img.alt = "双击可以放大";
img.onmousedown = null;
closeTag.style.top = "10px";
closeTag.style.left = "10px";
tagImg.style.overflow = "visible";
tagImg.style.width = img.offsetWidth + "px";
tagImg.style.left = ((sx - img.offsetWidth) / 2) + "px";
}
else {
img.style.width = ix + "px";
img.style.height = iy + "px";
img.alt = "双击可以缩小";
img.onmousedown = dragDown;
tagImg.style.overflow = "auto";
tagImg.style.width = (ix < sx - 100 ? ix + 20 : sx - 100) + "px";
tagImg.style.left = ((sx - (ix < sx - 100 ? ix + 20 : sx - 100)) / 2) + "px";
}
}
img.onmousedown = dragDown;
tagImg.onmousemove = barHidden;
tagImg.onmouseout = moveStop;
document.onmouseup = moveStop;
}
else {
tagImg.style.overflow = "visible";
//tagImg.onmousemove = barHidden;
}
}
function dragDown(a){
img.style.cursor = "move";
var evts = a || window.event;
var onx = evts.clientX, ony = evts.clientY;
var sox = tagImg.scrollLeft, soy = tagImg.scrollTop;
var sow = img.width + 2 - tagImg.clientWidth, soh = img.height + 2 - tagImg.clientHeight;
var xxleft, yytop;
document.onmousemove = function(e){
var evt = e || window.event;
xxleft = sox - (evt.clientX - onx) < 0 ? "0" : sox - (evt.clientX - onx) > sow ? sow : sox - (evt.clientX - onx);
yytop = soy - (evt.clientY - ony) < 0 ? "0" : soy - (evt.clientY - ony) > soh ? soh : soy - (evt.clientY - ony);
tagImg.scrollTop = yytop;
tagImg.scrollLeft = xxleft;
closeTag.style.top = (yytop + 10) + "px";
closeTag.style.left = (xxleft + 10) + "px";
return false;
}
return false;
}
function barHidden(){
clearTimeout(barShow);
closeTag.style.top = (tagImg.scrollTop + 10) + "px";
closeTag.style.left = (tagImg.scrollLeft + 10) + "px";
if (closeTag.style.display == "none")
closeTag.style.display = "block";
barShow = setTimeout(function(){
closeTag.style.display = "block";
}, 1000);
}
function closes(){
document.body.removeChild(tag);
document.body.removeChild(tagImg);
clearTimeout(barShow);
clearTimeout(imgTime);
document.onmouseup = null;
tag = img = tagImg = closeTag = null;
}
function moveStop(){
document.onmousemove = null;
tagImg.onmousemove = barHidden;
img.style.cursor = "pointer";
}
}
//事件绑定部分
if (document.getElementById("mydiv")) {
var workTag = document.getElementById("mydiv");
var workImg = workTag.getElementsByTagName("img"); //注册此处会把 workDemo下的所有img选中，包括子集下的子集。
var worka = workTag.getElementsByTagName("a");
for (var i = 0; i < workImg.length; i++) {
workImg[i].onclick = ImgShow;
worka[i].href = "##"
}
}
前台代码：
<div class="color1" id="mydiv"><b class="b1"></b><b class="b2"></b><b class="b3"></b><b class="b4"></b><div class="content">
<asp:DataList ID="dlContent" runat="server" OnItemCommand="dlContent_ItemCommand"
Font-Bold="False" Font-Italic="False"
Font-Overline="False" Font-Strikeout="False" Font-Underline="False"
HorizontalAlign="Center" Font-Size="Small"
ShowHeader="False" Width="100%" RepeatColumns="3" RepeatDirection="Horizontal" BackColor="#BBEDD0" BorderColor="#3366CC" BorderWidth="1px" CellPadding="0" BorderStyle="None" CellSpacing="2" ForeColor="#34599D">
<FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
<HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
<ItemStyle VerticalAlign="Middle" BackColor="#BBEDD0" Font-Bold="False" Font-Italic="False" Font-Overline="False" Font-Strikeout="False" Font-Underline="False" ForeColor="#6079AE" />
<ItemTemplate>
<a href="#" runat="server">
<asp:Image ID="userphoto" ImageUrl='<%# Eval("photourl") %>' runat="server" CssClass="image"/><br /></a>
<asp:Label ID="username" runat="server" Text='<%# Eval("agentname") %>' CssClass="odd"></asp:Label>
<asp:Label ID="vnum" runat="server" Text='<%# Eval("votenum") %>'></asp:Label>票
<br /><asp:ImageButton runat="server" ID="ImageVote" ImageUrl="~/images/zan_btn.png" CommandName="vote" CssClass="imgbtn"/>
</ItemTemplate>
<SelectedItemStyle BackColor="#738A9C" ForeColor="White" Font-Bold="True" />
</asp:DataList>
<div class="style_msg">
<asp:Label ID="alert" runat="server" Text="" CssClass="alert"></asp:Label>
|<asp:Button ID="lnkbtnUp" text="上一页" runat="server" OnClick="lnkbtnUp_Click"/>|<asp:Button ID="lnkbtnNext" runat="server" Text="下一页" OnClick="lnkbtnNext_Click"/>|<asp:Button ID="lnkbtnFst" runat="server" Text="首页" OnClick="lnkbtnFst_Click"/>|<asp:Button ID="lnkbtnLast" runat="server" Text="末页" OnClick="lnkbtnLast_Click"/>|<br />
第<asp:Label ID="labPage" runat="server" Text="1"></asp:Label>页,共<asp:Label ID="labLstPage" runat="server"></asp:Label>页</div>
</div><b class="b5"></b><b class="b6"></b><b class="b7"></b><b class="b8"></b></div>
</div>
