html input file 属性怎么能够选择之后马上预览图片?

html-css026

html input file 属性怎么能够选择之后马上预览图片?,第1张

这个并不是那么简单做出来的,一般情况下会加一段iframe代码,模拟ajax上传。

代码很简单,如下:

<!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/htmlcharset=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

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: blockwidth: 150pxheight: 180px"></div>

</td>

</tr>

<tr>

<td align="center" style="padding-top:10px"><input type="file" name="file"

id="doc" style="width:150px" onchange="javascript:setImagePreview()"></td>

</tr>

</tbody>

</table>

</body>

</html>

uploadimg.change(function(){

var oldimgurl=uploadimg.val()

alert(oldimgurl)//奇怪的是上传的框中显示的是F:\相册\四川之行\12.jpg,但是这句提示的值是C:\fakepath\12.jpg是什么原因????????????????????????

// $("#changeImg .leftpic").attr("src",oldimgurl) //图片框在ID为changeImg的块中,并且含有类leftpic

})