Asp.net图片上传实现预览效果的简单代码

在页面上放入一个上传控件和一个图片控件.

<asp:FileUpload ID="FileUpload1" runat="server" onpropertychange="show(this.value)"/>
        <asp:Image ID="Image1" runat="server"  />

在上传控件中写onpropertychange="show(this.value)"事件并调用js中的show函数并将自身的参数传进js.

<script type="text/javascript">
    function show(id)
    ...{
        document.getElementById("Image1").src=id;
    }
    </script>

Ie6,Ie7测试通过(注要通过滤器实现)

<div id="divview" style="filter : progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);WIDTH: 166px; HEIGHT: 190px">
<!--用于显示图片-->
</div>

<asp:FileUpload ID="FileUpload3" runat="server" onpropertychange="show1(this.value)"/>
<script type="text/javascript">

function show1(upimg)
...{
 var dd=document.getElementById("divview");
 dd.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = upimg;
 dd.style.width = 166;
 dd.style.height = 190;
 dd.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").sizingMethod = scale;
}
</script>