以下方法只能预览不能判断大小,img.readyState!="complete"判断为true为什么
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!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 id="Head1" runat="server">
<title>主</title>
</style>
<script language="javascript" type="text/javascript">
function btnBacl_Click() {
window.location = "UserList.aspx";
}
function Preview(imageshow,obj) { obj.select();
//得到真实的图片路径
var realpath = document.selection.createRange().text;
var img=document.createElement("img");
img.src=realpath ;
if(img.readyState!="complete")
{
alert("未加载完成!")
}
else
{
alert(img.fileSize);
}
var browser = getBrowserInfo();
var verinfo = (browser + "").replace(/[^0-9.]/ig, "");
if (verinfo == "8.0") { document.getElementById("imgPreview").innerHTML = "";
document.getElementById("imgPreview").style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled='true',src=\"" + realpath + "\")"; //使用滤镜效果,sizingMethod='scale' }
else {
document.getElementById("Image1").src = realpath;
}
} function getBrowserInfo() {
var agent = navigator.userAgent.toLowerCase(); var regStr_ie = /msie [\d.]+;/gi;
var regStr_ff = /firefox\/[\d.]+/gi
var regStr_chrome = /chrome\/[\d.]+/gi;
var regStr_saf = /safari\/[\d.]+/gi;
//IE
if (agent.indexOf("msie") > 0) {
return agent.match(regStr_ie);
} //firefox
if (agent.indexOf("firefox") > 0) {
return agent.match(regStr_ff);
} //Chrome
if (agent.indexOf("chrome") > 0) {
return agent.match(regStr_chrome);
} //Safari
if (agent.indexOf("safari") > 0 && agent.indexOf("chrome") < 0) {
return agent.match(regStr_saf);
} }
function isimg()
{
// show.insertAdjacentElement("BeforeEnd",img);
show1.innerHTML = "图片大小" + img.fileSize/1024 +"K<br />图片宽度"+ img.offsetWidth +"<br />图片高度"+ img.offsetHeight;
}
</script></head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" onChange="Preview(imageshow,this);" />
</div>
<div id="imgPreview" style='width: 110px; height: 133px;'>
<asp:Image ID="Image1" runat="server" Width="110px" Height="130px" CssClass="input" /><br />
</div>
<div><img border="0" id="imageshow" name="imageshow"src="" style="display:none;" alt="预览图片" > </div>
<div id="show" >
</div>
<div id="show1">
</div>
</form>
</body>
</html>JavaScript图片
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!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 id="Head1" runat="server">
<title>主</title>
</style>
<script language="javascript" type="text/javascript">
function btnBacl_Click() {
window.location = "UserList.aspx";
}
function Preview(imageshow,obj) { obj.select();
//得到真实的图片路径
var realpath = document.selection.createRange().text;
var img=document.createElement("img");
img.src=realpath ;
if(img.readyState!="complete")
{
alert("未加载完成!")
}
else
{
alert(img.fileSize);
}
var browser = getBrowserInfo();
var verinfo = (browser + "").replace(/[^0-9.]/ig, "");
if (verinfo == "8.0") { document.getElementById("imgPreview").innerHTML = "";
document.getElementById("imgPreview").style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled='true',src=\"" + realpath + "\")"; //使用滤镜效果,sizingMethod='scale' }
else {
document.getElementById("Image1").src = realpath;
}
} function getBrowserInfo() {
var agent = navigator.userAgent.toLowerCase(); var regStr_ie = /msie [\d.]+;/gi;
var regStr_ff = /firefox\/[\d.]+/gi
var regStr_chrome = /chrome\/[\d.]+/gi;
var regStr_saf = /safari\/[\d.]+/gi;
//IE
if (agent.indexOf("msie") > 0) {
return agent.match(regStr_ie);
} //firefox
if (agent.indexOf("firefox") > 0) {
return agent.match(regStr_ff);
} //Chrome
if (agent.indexOf("chrome") > 0) {
return agent.match(regStr_chrome);
} //Safari
if (agent.indexOf("safari") > 0 && agent.indexOf("chrome") < 0) {
return agent.match(regStr_saf);
} }
function isimg()
{
// show.insertAdjacentElement("BeforeEnd",img);
show1.innerHTML = "图片大小" + img.fileSize/1024 +"K<br />图片宽度"+ img.offsetWidth +"<br />图片高度"+ img.offsetHeight;
}
</script></head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" onChange="Preview(imageshow,this);" />
</div>
<div id="imgPreview" style='width: 110px; height: 133px;'>
<asp:Image ID="Image1" runat="server" Width="110px" Height="130px" CssClass="input" /><br />
</div>
<div><img border="0" id="imageshow" name="imageshow"src="" style="display:none;" alt="预览图片" > </div>
<div id="show" >
</div>
<div id="show1">
</div>
</form>
</body>
</html>JavaScript图片
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$(this).attr('width');
});在load事件里面可以获取加载完成后图片的大小,这时候你可以对图片的显示进行相关处理
http://www.cnblogs.com/insus/archive/2012/11/13/2768951.html
http://www.cnblogs.com/insus/archive/2012/03/08/2385054.html
img.readyState如果你查过这个属性,你就知道它正是反应加载过程中的状态的
所以,用事件来比较好
img.onload = function(){if(img.readyState=="complete" || img.complete == true) ...};
img.src=realpath ; //一定要在注册事件处理之后再赋值(加载)
如果你在否定条件里alert,会发现可能会alert多次