Question

在datagrid中显示了产品图片,图片是以二进制存放在数据库中的,鼠标放在图片上时,图片放大,请问怎么做啊

Answer 1

用js脚本实现吧，可以在页面上添加一个div层，设置图片的onmouseover事件及onmouseout事件，通过脚本控制显示层，层的内容为放大后的图片

参考脚本：
var ua = navigator.userAgent
var ps = navigator.productSub
var dom = (document.getElementById)? 1:0
var ie4 = (document.all&&!dom)? 1:0
var ie5 = (document.all&&dom)? 1:0
var nn4 =(navigator.appName.toLowerCase() == "netscape" && parseInt(navigator.appVersion) == 4)
var nn6 = (dom&&!ie5)? 1:0
var sNav = (nn4||nn6||ie4||ie5)? 1:0
var cssFilters = ((ua.indexOf("MSIE 5.5")>=0||ua.indexOf("MSIE 6")>=0)&&ua.indexOf("Opera")<0)? 1:0
var Style=[],Text=[],Count=0,sbw=0,move=0,hs="",mx,my,scl,sct,ww,wh,obj,sl,st,ih,iw,vl,hl,sv,evlh,evlw,tbody
var HideTip = "eval(obj+sv+hl+';'+obj+sl+'=0;'+obj+st+'=-800')"
var doc_root = ((ie5&&ua.indexOf("Opera")<0||ie4)&&document.compatMode=="CSS1Compat")? "document.documentElement":"document.body"
var PX = (nn6)? "px" :""

if(sNav) {
window.onresize = ReloadTip
document.onmousemove = MoveTip
if(nn4) document.captureEvents(Event.MOUSEMOVE)
}
if(nn4||nn6) {
mx = "e.pageX"
my = "e.pageY"
scl = "window.pageXOffset"
sct = "window.pageYOffset"
if(nn4) {
obj = "document.TipLayer."
sl = "left"
st = "top"
ih = "clip.height"
iw = "clip.width"
vl = "'show'"
hl = "'hide'"
sv = "visibility="
}
else obj = "document.getElementById('TipLayer')."
}
if(ie4||ie5) {
obj = "TipLayer."
mx = "event.x"
my = "event.y"
scl = "eval(doc_root).scrollLeft"
sct = "eval(doc_root).scrollTop"
if(ie5) {
mx = mx+"+"+scl
my = my+"+"+sct
}
}
if(ie4||dom){
sl = "style.left"
st = "style.top"
ih = "offsetHeight"
iw = "offsetWidth"
vl = "'visible'"
hl = "'hidden'"
sv = "style.visibility="
}
if(ie4||ie5||ps>=20020823) {
ww = "eval(doc_root).clientWidth"
wh = "eval(doc_root).clientHeight"
}
else {
ww = "window.innerWidth"
wh = "window.innerHeight"
evlh = eval(wh)
evlw = eval(ww)
sbw=15
}

function applyCssFilter(){
if(cssFilters&&FiltersEnabled) {
var dx = " progid:DXImageTransform.Microsoft."
TipLayer.style.filter = "revealTrans()"+dx+"Fade(Overlap=1.00 enabled=0)"+dx+"Inset(enabled=0)"+dx+"Iris(irisstyle=PLUS,motion=in enabled=0)"+dx+"Iris(irisstyle=PLUS,motion=out enabled=0)"+dx+"Iris(irisstyle=DIAMOND,motion=in enabled=0)"+dx+"Iris(irisstyle=DIAMOND,motion=out enabled=0)"+dx+"Iris(irisstyle=CROSS,motion=in enabled=0)"+dx+"Iris(irisstyle=CROSS,motion=out enabled=0)"+dx+"Iris(irisstyle=STAR,motion=in enabled=0)"+dx+"Iris(irisstyle=STAR,motion=out enabled=0)"+dx+"RadialWipe(wipestyle=CLOCK enabled=0)"+dx+"RadialWipe(wipestyle=WEDGE enabled=0)"+dx+"RadialWipe(wipestyle=RADIAL enabled=0)"+dx+"Pixelate(MaxSquare=35,enabled=0)"+dx+"Slide(slidestyle=HIDE,Bands=25 enabled=0)"+dx+"Slide(slidestyle=PUSH,Bands=25 enabled=0)"+dx+"Slide(slidestyle=SWAP,Bands=25 enabled=0)"+dx+"Spiral(GridSizeX=16,GridSizeY=16 enabled=0)"+dx+"Stretch(stretchstyle=HIDE enabled=0)"+dx+"Stretch(stretchstyle=PUSH enabled=0)"+dx+"Stretch(stretchstyle=SPIN enabled=0)"+dx+"Wheel(spokes=16 enabled=0)"+dx+"GradientWipe(GradientSize=1.00,wipestyle=0,motion=forward enabled=0)"+dx+"GradientWipe(GradientSize=1.00,wipestyle=0,motion=reverse enabled=0)"+dx+"GradientWipe(GradientSize=1.00,wipestyle=1,motion=forward enabled=0)"+dx+"GradientWipe(GradientSize=1.00,wipestyle=1,motion=reverse enabled=0)"+dx+"Zigzag(GridSizeX=8,GridSizeY=8 enabled=0)"+dx+"Alpha(enabled=0)"+dx+"Dropshadow(OffX=3,OffY=3,Positive=true,enabled=0)"+dx+"Shadow(strength=3,direction=135,enabled=0)"
}
}

function stm(title,txt,s) {
if(sNav) {
if(title.length<2||s.length<25) {
var ErrorNotice = "DHTML TIP MESSAGE VERSION 1.2 ERROR NOTICE.\n"
if(t.length<2&&s.length<25) alert(ErrorNotice+"It looks like you removed an entry or more from the Style Array and Text Array of this tip.\nTheir should be 25 entries in every Style Array even though empty and 2 in every Text Array. You defined only "+s.length+" entries in the Style Array and "+t.length+" entry in the Text Array. This tip won't be viewed to avoid errors")
else if(t.length<2) alert(ErrorNotice+"It looks like you removed an entry or more from the Text Array of this tip.\nTheir should be 2 entries in every Text Array. You defined only "+t.length+" entry. This tip won't be viewed to avoid errors.")
else if(s.length<25) alert(ErrorNotice+"It looks like you removed an entry or more from the Style Array of this tip.\nTheir should be 25 entries in every Style Array even though empty. You defined only "+s.length+" entries. This tip won't be viewed to avoid errors.")
}
else {
var ab = "" ;var ap = ""
var titCol = (s[0])? "COLOR='"+s[0]+"'" : ""
var txtCol = (s[1])? "COLOR='"+s[1]+"'" : ""
var titBgCol = (s[2])? "BGCOLOR='"+s[2]+"'" : ""
var txtBgCol = (s[3])? "BGCOLOR='"+s[3]+"'" : ""
var titBgImg = (s[4])? "BACKGROUND='"+s[4]+"'" : ""
var txtBgImg = (s[5])? "BACKGROUND='"+s[5]+"'" : ""
var titTxtAli = (s[6] && s[6].toLowerCase()!="left")? "ALIGN='"+s[6]+"'" : ""
var txtTxtAli = (s[7] && s[7].toLowerCase()!="left")? "ALIGN='"+s[7]+"'" : ""
var add_height = (s[15])? "HEIGHT='"+s[15]+"'" : ""
if(!s[8]) s[8] = "Verdana,Arial,Helvetica"
if(!s[9]) s[9] = "Verdana,Arial,Helvetica"
if(!s[12]) s[12] = 2
if(!s[13]) s[13] = 2
if(!s[14]) s[14] = 200
if(!s[16]) s[16] = 0
if(!s[17]) s[17] = 0
if(!s[18]) s[18] = 10
if(!s[19]) s[19] = 10
hs = s[11].toLowerCase()
if(ps==20001108){
if(s[2]) ab="STYLE='border:"+s[16]+"px solid"+" "+s[2]+"'"
ap="STYLE='padding:"+s[17]+"px "+s[17]+"px "+s[17]+"px "+s[17]+"px'"}
var closeLink=(hs=="sticky")? "<TD ALIGN='right'><FONT SIZE='"+s[12]+"' FACE='"+s[8]+"'><A HREF='javascript:void(0)' ONCLICK='stickyhide()' STYLE='text-decoration:none;color:"+s[0]+"'><B>Close</B></A></FONT></TD>":""
var title=(title||hs=="sticky")? "<TABLE WIDTH='100%' BORDER='0' CELLPADDING='0' CELLSPACING='0'><TR><TD "+titTxtAli+"><FONT SIZE='"+s[12]+"' FACE='"+s[8]+"' "+titCol+"><B>"+title+"</B></FONT></TD>"+closeLink+"</TR></TABLE>" : ""
var txt="<TABLE "+titBgImg+" "+ab+" WIDTH='"+s[14]+"' BORDER='0' CELLPADDING='"+s[16]+"' CELLSPACING='0' "+titBgCol+" ><TR><TD>"+title+"<TABLE WIDTH='100%' "+add_height+" BORDER='0' CELLPADDING='"+s[17]+"' CELLSPACING='0' "+txtBgCol+" "+txtBgImg+"><TR><TD "+txtTxtAli+" "+ap+" VALIGN='top'><FONT SIZE='"+s[13]+"' FACE='"+s[9]+"' "+txtCol +">"+txt+"</FONT></TD></TR></TABLE></TD></TR></TABLE>"
if(nn4) {
with(eval(obj+"document")) {
open()
write(txt)
close()
}
}
else eval(obj+"innerHTML=txt")
tbody = {
Pos:s[10].toLowerCase(),
Xpos:s[18],
Ypos:s[19],
Transition:s[20],
Duration:s[21],
Alpha:s[22],
ShadowType:s[23].toLowerCase(),
ShadowColor:s[24],
Width:parseInt(eval(obj+iw)+3+sbw)
}
if(ie4) {
TipLayer.style.width = s[14]
tbody.Width = s[14]
}
Count=0
move=1
}
}
}

function MoveTip(e) {
if(move) {
var X,Y,MouseX = eval(mx),MouseY = eval(my); tbody.Height = parseInt(eval(obj+ih)+3)
tbody.wiw = parseInt(eval(ww+"+"+scl)); tbody.wih = parseInt(eval(wh+"+"+sct))
switch(tbody.Pos) {
case "left" : X=MouseX-tbody.Width-tbody.Xpos; Y=MouseY+tbody.Ypos; break
case "center": X=MouseX-(tbody.Width/2); Y=MouseY+tbody.Ypos; break
case "float": X=tbody.Xpos+eval(scl); Y=tbody.Ypos+eval(sct); break
case "fixed": X=tbody.Xpos; Y=tbody.Ypos; break
default: X=MouseX+tbody.Xpos; Y=MouseY+tbody.Ypos
}

if(tbody.wiw<tbody.Width+X) X = tbody.wiw-tbody.Width
if(tbody.wih<tbody.Height+Y+sbw) {
if(tbody.Pos=="float"||tbody.Pos=="fixed") Y = tbody.wih-tbody.Height-sbw
else Y = MouseY-tbody.Height
}
if(X<0) X=0
eval(obj+sl+"=X+PX;"+obj+st+"=Y+PX")
ViewTip()
}
}

function ViewTip() {
Count++
if(Count == 1) {
if(cssFilters&&FiltersEnabled) {
for(Index=28; Index<31; Index++) { TipLayer.filters[Index].enabled = 0 }
for(s=0; s<28; s++) { if(TipLayer.filters[s].status == 2) TipLayer.filters[s].stop() }
if(tbody.Transition == 51) tbody.Transition = parseInt(Math.random()*50)
var applyTrans = (tbody.Transition>-1&&tbody.Transition<24&&tbody.Duration>0)? 1:0
var advFilters = (tbody.Transition>23&&tbody.Transition<51&&tbody.Duration>0)? 1:0
var which = (applyTrans)?0:(advFilters)? tbody.Transition-23:0
if(tbody.Alpha>0&&tbody.Alpha<100) {
TipLayer.filters[28].enabled = 1
TipLayer.filters[28].opacity = tbody.Alpha
}
if(tbody.ShadowColor&&tbody.ShadowType == "simple") {
TipLayer.filters[29].enabled = 1
TipLayer.filters[29].color = tbody.ShadowColor
}
else if(tbody.ShadowColor&&tbody.ShadowType == "complex") {
TipLayer.filters[30].enabled = 1
TipLayer.filters[30].color = tbody.ShadowColor
}
if(applyTrans||advFilters) {
eval(obj+sv+hl)
if(applyTrans) TipLayer.filters[0].transition = tbody.Transition
TipLayer.filters[which].duration = tbody.Duration
TipLayer.filters[which].apply()
}
}
eval(obj+sv+vl)
if(cssFilters&&FiltersEnabled&&(applyTrans||advFilters)) TipLayer.filters[which].play()
if(hs == "sticky") move=0
}
}

function stickyhide() {
eval(HideTip)
}

function ReloadTip() {
if(nn4&&(evlw!=eval(ww)||evlh!=eval(wh))) location.reload()
else if(hs == "sticky") eval(HideTip)
}

function htm() {
if(sNav) {
if(hs!="keep") {
move=0;
if(hs!="sticky") eval(HideTip)
}
}
}

层代码
<div id="TipLayer" style="Z-INDEX: 103; VISIBILITY: hidden; POSITION: absolute; TOP: -100px"></div>