javascript预览上传的本地图片

 

<form  id="myForm" runat="server">
    <div>
    <input type="file" name="updFile" id="updFile" onchange="Change()"/>
    </div>
    <div id="imgFiles"></div>
    <script type="text/javascript">
        function Change() {

            var x = document.getElementById("updFile");
            var imgAll = document.getElementById("imgFiles");
           
            if (!x || !x.value) return;
            var patn = /\.jpg$|\.jpeg$|\.gif$/i;
            if (patn.test(x.value)) {
                var y = document.getElementById(x.value);
                //判断原图片是否存在，如果存在，则不加载进来
                if (y) return
                var newFileName = document.getElementById("updFile").value;
                var imgHtml = "<div><h1 id=\"" + newFileName + "\" style=\"border: 1px solid black; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);width: 100px; height: 100px\"></h1><INPUT type=\"button\"  NAME=\"Delete\" value=\"删除\" onclick=\"delFile(this)\"></div>";
                var objFiles = document.getElementById("imgFiles");
                document.getElementById('imgFiles').insertAdjacentHTML("beforeEnd", imgHtml)

                document.getElementById(newFileName).filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = newFileName;
                document.getElementById(newFileName).style.width = document.getElementById(newFileName).offsetWidth;
                document.getElementById(newFileName).style.height = document.getElementById(newFileName).offsetHeight;
                document.getElementById(newFileName).filters.item("DXImageTransform.Microsoft.AlphaImageLoader").sizingMethod = "scale";
            }
            else {
                alert("您选择的似乎不是图像文件。");
            }

        }
        function delFile(obj) {
            obj.parentElement.removeNode(true);
        }
        </script>
</form>