转 ： http://www.codefans.net/articles/1395.shtml
兼容好的JS图片上传预览代码 （谷歌，IE11）
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>本地图片预览</title> <style type="text/css"> #preview{100px;height:100px;border:1px solid #000;overflow:hidden;} #imghead {filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);} </style> <script type="text/javascript"> function previewImage(file) { var MAXWIDTH = 100; var MAXHEIGHT = 100; var div = document.getElementById('preview'); if (file.files && file.files[0]) { div.innerHTML = '<img id=imghead>'; var img = document.getElementById('imghead'); img.onload = function () { var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight); img.width = rect.width; img.height = rect.height; img.style.marginLeft = rect.left + 'px'; img.style.marginTop = rect.top + 'px'; } var reader = new FileReader(); reader.onload = function (evt) { img.src = evt.target.result; } reader.readAsDataURL(file.files[0]); } else { var sFilter = 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="'; file.select(); var src = document.selection.createRange().text; div.innerHTML = '<img id=imghead>'; var img = document.getElementById('imghead'); img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src; var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight); status = ('rect:' + rect.top + ',' + rect.left + ',' + rect.width + ',' + rect.height); div.innerHTML = "<div id=divhead style='" + rect.width + "px;height:" + rect.height + "px;margin-top:" + rect.top + "px;margin-left:" + rect.left + "px;" + sFilter + src + ""'></div>"; } } function clacImgZoomParam(maxWidth, maxHeight, width, height) { var param = { top: 0, left: 0, width, height: height }; if (width > maxWidth || height > maxHeight) { rateWidth = width / maxWidth; rateHeight = height / maxHeight; if (rateWidth > rateHeight) { param.width = maxWidth; param.height = Math.round(height / rateWidth); } else { param.width = Math.round(width / rateHeight); param.height = maxHeight; } } param.left = Math.round((maxWidth - param.width) / 2); param.top = Math.round((maxHeight - param.height) / 2); return param; } </script> </head> <body> <div id="preview"> <img id="imghead" width="100" height="100" border="0" src='../images/btn_area.jpg'><!--无预览时的默认图像，自己弄一个--> </div> <br/> <input type="file" onchange="previewImage(this)" /> </body> </html>
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IE8, IE9,IE10 本地上传图片预览
<script>
function PreviewImage(imgFile)
{
var filextension=imgFile.value.substring(imgFile.value.lastIndexOf("."),imgFile.value.length);
filextension=filextension.toLowerCase();
if ((filextension!='.jpg')&&(filextension!='.gif')&&(filextension!='.jpeg')&&(filextension!='.png')&&(filextension!='.bmp'))
{
alert("对不起，系统仅支持标准格式的照片，请您调整格式后重新上传，谢谢 !");
imgFile.focus();
}
else
{
var path;
if(document.all)//IE
{
imgFile.select();
path = document.selection.createRange().text;
document.getElementById("imgPreview").innerHTML="";
document.getElementById("imgPreview").style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled='true',sizingMethod='scale',src="" + path + "")";//使用滤镜效果
}
else//FF
{
path = imgFile.files[0].getAsDataURL();
document.getElementById("imgPreview").innerHTML = "<img id='img1' width='120px' height='100px' src='"+path+"'/>";
//document.getElementById("img1").src = path;
}
}
}
</script>
</head>
<body>
<input type="file" onchange='PreviewImage(this)' />
<br />
<div id="imgPreview" style='120px; height:100px;'>
<img id="img1" src="" width="120" height="100" />
</div>
===================================
<script type="text/javascript">
//js本地图片预览，兼容ie[6-9]、火狐、Chrome17+、Opera11+、Maxthon3
function PreviewImage(fileObj, imgPreviewId, divPreviewId) {
var allowExtention = ".jpg,.bmp,.gif,.png"; //允许上传文件的后缀名document.getElementById("hfAllowPicSuffix").value;
var extention = fileObj.value.substring(fileObj.value.lastIndexOf(".") + 1).toLowerCase();
var browserVersion = window.navigator.userAgent.toUpperCase();
if (allowExtention.indexOf(extention) > -1) {
if (fileObj.files) {//HTML5实现预览，兼容chrome、火狐7+等
if (window.FileReader) {
var reader = new FileReader();
reader.onload = function (e) {
document.getElementById(imgPreviewId).setAttribute("src", e.target.result);
}
reader.readAsDataURL(fileObj.files[0]);
} else if (browserVersion.indexOf("SAFARI") > -1) {
alert("不支持Safari6.0以下浏览器的图片预览!");
}
} else if (browserVersion.indexOf("MSIE") > -1) {
if (browserVersion.indexOf("MSIE 6") > -1) {//ie6
document.getElementById(imgPreviewId).setAttribute("src", fileObj.value);
} else {//ie[7-9]
fileObj.select();
if (browserVersion.indexOf("MSIE 9") > -1)
//fileObj.blur(); //不加上document.selection.createRange().text在ie9会拒绝访问
document.getElementById(divPreviewId).focus(); //参考http://gallop-liu.iteye.com/blog/1344778
var newPreview = document.getElementById(divPreviewId + "New");
if (newPreview == null) {
newPreview = document.createElement("div");
newPreview.setAttribute("id", divPreviewId + "New");
newPreview.style.width = document.getElementById(imgPreviewId).width + "px";
newPreview.style.height = document.getElementById(imgPreviewId).height + "px";
newPreview.style.border = "solid 1px #d2e2e2";
}
newPreview.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='scale',src='" + document.selection.createRange().text + "')";
var tempDivPreview = document.getElementById(divPreviewId);
tempDivPreview.parentNode.insertBefore(newPreview, tempDivPreview);
tempDivPreview.style.display = "none";
}
} else if (browserVersion.indexOf("FIREFOX") > -1) {//firefox
var firefoxVersion = parseFloat(browserVersion.toLowerCase().match(/firefox/([d.]+)/)[1]);
if (firefoxVersion < 7) {//firefox7以下版本
document.getElementById(imgPreviewId).setAttribute("src", fileObj.files[0].getAsDataURL());
} else {//firefox7.0+
document.getElementById(imgPreviewId).setAttribute("src", window.URL.createObjectURL(fileObj.files[0]));
}
} else {
document.getElementById(imgPreviewId).setAttribute("src", fileObj.value);
}
} else {
alert("仅支持" + allowExtention + "为后缀名的文件!");
fileObj.value = ""; //清空选中文件
if (browserVersion.indexOf("MSIE") > -1) {
fileObj.select();
document.selection.clear();
}
fileObj.outerHTML = fileObj.outerHTML;
}
}
</script>
-----
<td>
<asp:FileUpload ID="AttrImage" runat="server" Width="400px" onchange="PreviewImage(this,'imgHeadPhoto','divPreview')" size="20" />
</td>
<td colspan="2" rowspan="2" align="center">
<div id="divPreview">
<img id="imgHeadPhoto" src="../../Manager/Image/暂无.jpg" style=" 135px; height: 125px; border: solid 1px #d2e2e2;" alt="" />
</div>