<!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{
filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale);
}
#preview_size_fake{
filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);
visibility:hidden;
}
#preview{ width:300px; height:300px; }
</style>
<script type="text/javascript">
function onUploadImgChange(sender) {
var filePath = sender.value;
var fileExt = filePath.substring(filePath.lastIndexOf(".")).toLowerCase();
if (!checkFileExt(fileExt)) {
alert("您上传的文件不是图片,请重新上传！");
return;
}
var objPreview = document.getElementById('preview');
var objPreviewFake = document.getElementById('preview_fake');
var objPreviewSizeFake = document.getElementById('preview_size_fake');
try {
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();
//读取图片文件大小
fileSize = sender.files[0].fileSize;
checkFileSize(sender, fileSize);
} 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';
//读取图片文件大小
var sh = setInterval(function() {
var img = document.createElement("img");
img.src = imgSrc;
fileSize = img.fileSize;
if (fileSize > 0) {
checkFileSize(sender, fileSize);
clearInterval(sh);
}
img = null;
},
100);
}
} catch(e) {
alert("您上传的文件过大或者不是图片,请重新上传！");
}
}
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
};
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