function getFullPath(obj)
{
if(obj)
{
if (window.navigator.userAgent.indexOf("MSIE")>=1)
{
obj.select();
return document.selection.createRange().text;
}
else if(window.navigator.userAgent.indexOf("Firefox")>=1)
{
if(obj.files)
{
return obj.files.item(0).getAsDataURL();
}
return obj.value;
}
return obj.value;
}
}
上面那个方法返回图片的全地址
下面是调用方法:
function ShowLogo(obj)
{
var isok = true;
$("errorlogo").style.display ="none";
$("imglogo").style.display = "none";
var filelogo = $("ctl00_ContentPlaceHolder1_FileLogo");//上传控件
var imgobj = new Image();
var AllImgExt = ".jpg|.gif|.bmp|.png|.JPG|.GIF|.BMP|.PNG|";
var AllowImgFileSize=204800;
var ImgFileSize,FileExt;
FileExt=obj.value.substr(obj.value.lastIndexOf(".")).toLowerCase(); if(AllImgExt!=0&&AllImgExt.indexOf(FileExt+"|")==-1) //判断文件类型是否允许上传
{
$("errorlogo").style.display ="";
$("errorlogo").innerHTML = "请上传 "+AllImgExt+" 类型的文件,当前文件类型为"+FileExt;
filelogo.value = "";
return false;
}
img.src = getFullPath(obj);
}
$("ctl00_ContentPlaceHolder1_Logo").setAttribute("src",getFullPath(obj));
}补充:IE6,7/FireFox/遨游/TT都过了,但是就只有IE8不能显示,求高手指出问题所在!
{
if(obj)
{
if (window.navigator.userAgent.indexOf("MSIE")>=1)
{
obj.select();
return document.selection.createRange().text;
}
else if(window.navigator.userAgent.indexOf("Firefox")>=1)
{
if(obj.files)
{
return obj.files.item(0).getAsDataURL();
}
return obj.value;
}
return obj.value;
}
}
上面那个方法返回图片的全地址
下面是调用方法:
function ShowLogo(obj)
{
var isok = true;
$("errorlogo").style.display ="none";
$("imglogo").style.display = "none";
var filelogo = $("ctl00_ContentPlaceHolder1_FileLogo");//上传控件
var imgobj = new Image();
var AllImgExt = ".jpg|.gif|.bmp|.png|.JPG|.GIF|.BMP|.PNG|";
var AllowImgFileSize=204800;
var ImgFileSize,FileExt;
FileExt=obj.value.substr(obj.value.lastIndexOf(".")).toLowerCase(); if(AllImgExt!=0&&AllImgExt.indexOf(FileExt+"|")==-1) //判断文件类型是否允许上传
{
$("errorlogo").style.display ="";
$("errorlogo").innerHTML = "请上传 "+AllImgExt+" 类型的文件,当前文件类型为"+FileExt;
filelogo.value = "";
return false;
}
img.src = getFullPath(obj);
}
$("ctl00_ContentPlaceHolder1_Logo").setAttribute("src",getFullPath(obj));
}补充:IE6,7/FireFox/遨游/TT都过了,但是就只有IE8不能显示,求高手指出问题所在!
<!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/html; charset=utf-8" />
<title>Firefox3,IE6,IE7,IE8上传图片预览</title>
<style type="text/css">
#preview_wrapper{
display:inline-block;
width:300px;
height:300px;
background-color:#CCC;
}
#preview_fake{ /* 该对象用户在IE下显示预览图片 */
filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale);
}
#preview_size_fake{ /* 该对象只用来在IE下获得图片的原始尺寸,无其它用途 */
filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);
visibility:hidden;
}
#preview{ /* 该对象用户在FF下显示预览图片 */
width:300px;
height:300px;
}
</style><script type="text/javascript">
function onUploadImgChange(sender){
if( !sender.value.match( /.jpg|.gif|.png|.bmp/i ) ){
alert('图片格式无效!');
return false;
}
var objPreview = document.getElementById( 'preview' );
var objPreviewFake = document.getElementById( 'preview_fake' );
var objPreviewSizeFake = document.getElementById( 'preview_size_fake' );
if( sender.files && sender.files[0] ){
objPreview.style.display = 'block';
objPreview.style.width = 'auto';
objPreview.style.height = 'auto';
// Firefox 因安全性问题已无法直接通过 input[file].value 获取完整的文件路径
objPreview.src = sender.files[0].getAsDataURL();
}else if( objPreviewFake.filters ){
// IE7,IE8 在设置本地图片地址为 img.src 时出现莫名其妙的后果
//(相同环境有时能显示,有时不显示),因此只能用滤镜来解决
// IE7, IE8因安全性问题已无法直接通过 input[file].value 获取完整的文件路径
sender.select();
var imgSrc = document.selection.createRange().text;
objPreviewFake.filters.item(
'DXImageTransform.Microsoft.AlphaImageLoader').src = imgSrc;
objPreviewSizeFake.filters.item(
'DXImageTransform.Microsoft.AlphaImageLoader').src = imgSrc;
autoSizePreview( objPreviewFake,
objPreviewSizeFake.offsetWidth, objPreviewSizeFake.offsetHeight );
objPreview.style.display = 'none';
}
}function onPreviewLoad(sender){
autoSizePreview( sender, sender.offsetWidth, sender.offsetHeight );
}function autoSizePreview( objPre, originalWidth, originalHeight ){
var zoomParam = clacImgZoomParam( 300, 300, originalWidth, originalHeight );
objPre.style.width = zoomParam.width + 'px';
objPre.style.height = zoomParam.height + 'px';
objPre.style.marginTop = zoomParam.top + 'px';
objPre.style.marginLeft = zoomParam.left + 'px';
}function clacImgZoomParam( maxWidth, maxHeight, width, height ){
var param = { width:width, height:height, top:0, left:0 };
if( width>maxWidth || height>maxHeight ){
rateWidth = width / maxWidth;
rateHeight = height / maxHeight;
if( rateWidth > rateHeight ){
param.width = maxWidth;
param.height = height / rateWidth;
}else{
param.width = width / rateHeight;
param.height = maxHeight;
}
}
param.left = (maxWidth - param.width) / 2;
param.top = (maxHeight - param.height) / 2;
return param;
}
</script></head><body>
<div id="preview_wrapper">
<div id="preview_fake">
<img id="preview" onload="onPreviewLoad(this)"/>
</div>
</div>
<br/>
<input id="upload_img" type="file" onchange="onUploadImgChange(this)"/>
<br/>
<img id="preview_size_fake"/>
</body>
</html>
<Html>
<head>
</head>
<body>
<input id="myfile" type="file" onChange="showImg()" />
<br />
<img src="" alt="Image to be upload." onload="javascript:DrawImage(this)"/>
<script type="text/javascript">
function showImg(){
var dFile = document.getElementById('myfile');
var dImg = document.getElementsByTagName('img')[0];
//ff
if(dFile.files){
dImg.src = dFile.files[0].getAsDataURL();
//ie
}else{
dImg.src = dFile.value;
}
} function DrawImage(ImgD){
var image=new Image();
image.src=ImgD.src;
}
</script>
</body>
</Html>
1、ie8下<script type="text/javascript">....</script>这段东西要写到下面去
2、头部<head>的地方要加“<meta http-equiv="X-UA-Compatible" content="IE=7">”这样ie8下就可以了