文件上传显示缩略图

来源：互联网发布：甲骨文 ibm做啥软件编辑：程序博客网时间：2024/04/29 15:05

<!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>By：DragonDean</title>
<script type="text/javascript">
//下面用于图片上传预览功能
function setImagePreview(avalue) {
var docObj = document.getElementById("doc");

var imgObjPreview = document.getElementById("preview");
if(docObj.files && docObj.files[0]) {
//火狐下，直接设img属性
imgObjPreview.style.display = 'block';
imgObjPreview.style.width = '150px';
imgObjPreview.style.height = '180px';
//imgObjPreview.src = docObj.files[0].getAsDataURL();

//火狐7以上版本不能用上面的getAsDataURL()方式获取，需要一下方式
console.log(docObj.files.length);
imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);
} else {
//IE下，使用滤镜
docObj.select();
var imgSrc = document.selection.createRange().text;
var localImagId = document.getElementById("localImag");
//必须设置初始大小
localImagId.style.width = "150px";
localImagId.style.height = "180px";
//图片异常的捕捉，防止用户修改后缀来伪造图片
try {
localImagId.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;
} catch(e) {
alert("您上传的图片格式不正确，请重新选择!");
return false;
}
imgObjPreview.style.display = 'none';
document.selection.empty();
}
return true;
}
</script>
</head>

<body>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td height="101" align="center">
<div id="localImag"><img id="preview" src="http://blog.chuangling.net/Public/images/top.jpg" width="150" height="180" style="display: block; width: 150px; height: 180px;"></div>
</td>
</tr>
<tr>
<td align="center" style="padding-top:10px;"><input accept="image/gif,image/jpeg,image/jpg,image/png,image/svg" multiple="multiple" type="file" name="file" id="doc" style="width:150px;" onchange="javascript:setImagePreview();"></td>
</tr>
</tbody>
</table>
</body>

</html>

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