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实现根据后台绑定小图片，鼠标移至小图，自动显示相应大图
.net精简版本
<script language="javascript">
function getshowimg(imgfile)
{
document.all("showimage").src = "/semir/images/"+ imgfile;
}
</script>
//datalist绑定
<asp:datalist id="dlsides" runat="server" onitemcommand="dlsides_itemcommand" repeatdirection="horizontal"
repeatcolumns="3" datakeyfield="sideid" cssclass="semirtext">
<itemtemplate>
<a onmouseover="getshowimg('<%# databinder.eval(container.dataitem, "sidepath")%>')"><img style="width: 45px; height: 56px" alt="" src='/semir/images/small<%# databinder.eval(container.dataitem, "sidepath")%>' border=0 ></a>
</itemtemplate>
</asp:datalist>
// 显示相应大图
<img name="showimage">
asp完整版
<script language="javascript">
function imagepreload()
{
var args = imagepreload.arguments;
document.imgprearray = new array(args.length);
for(var i=0; i<args.length; i++)
{
document.imgprearray[i] = new image;
document.imgprearray[i].src = "admin/upfile/newbook/"+ args[i];
}
}
function fitsize() {
var a, b;
var imgobj = document.all("showimage");
var oldimg = new image();
oldimg.src = imgobj.src;
var dw = oldimg.width;
var dh = oldimg.height;
if(imgobj == null) {
settimeout("fitsize()", 50);
return;
}
if(imgobj.offsetwidth == 0) {
settimeout("fitsize()", 50);
return;
}
var maxw = 300;
var maxh = 270;
if(dw>maxw || dh>maxh) {
a = dw/maxw;
b = dh/maxw;
if(b>a) a=b;
dw = dw/a;
dh = dh/a;
}
if(dw > 0 && dh > 0) {
imgobj.width = dw;
imgobj.height = dh;
}
}
function getshowimg(imgtext, imgfile) {
document.all("showimgtext").innerhtml = imgtext;
document.all("showimage").src = "admin/upfile/newbook/"+ imgfile;
document.all("showimage").width = 267;
document.all("showimage").height = 267;
//fitsize();'show picture size
}
function showtextdetail(n) {
for (i=1; i<5; i++) {
document.all("textdetail"+i).style.display = "none";
}
document.all("textdetail"+n).style.display = "";
for (i=1; i<4; i++) {
document.all("titledetail"+i).classname = "shoptaboff";
}
if (n < 4) {
document.all("titledetail"+n).classname = "shoptabon";
}
}
</script>
<script language="javascript" for="window" event="onload">
imagepreload('<%=rs("picture")%>');
</script>
'---------调用-显示-------
<%if rs("picture")<>"" then %>
<a style="cursor:hand">
<img name="showimage" src="admin/upfile/newbook/<%=rs("picture")%>" border="0" width="267" height="267">
<!-- <img name="showimage" src="../upimages/f_060524_000613_46398.jpg" border=0 onload="fitsize();"> -->
</a> <span id="showimgtext" style="font-weight: bold;"></span>
<% end if %>
‘--------------鼠标移过的图片------
<% if rs("picture")<>"" then%>
<a onmouseover="getshowimg('','<%=rs("picture")%>');">
<img name="image71" src="admin/upfile/newbook/<%=rs("picture")%>" alt="dogo" width="40" height="30" border="0"></a>
<%end if%>
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