上传图片 无刷新。

 

<asp:FileUpload ID="fuPhoto" runat="server" name="fuPhoto" onchange="setImagePreview(this);" />

<img id="preView" alt="" src="<%=StyleUrl %>images/none.jpg" class="thumbImage xzyy">
<div id="div_view" style="height: 6px; width: 6px">

 <asp:ImageButton ID="btnSave" OnClick="btnSave_Click" OnClientClick="return VaillReturn()"
 runat="server" ImageUrl="http://artvillageonline.com/Template/xpshop_clothes2/images/Step1images/submit.jpg" />
<pre name="code" class="html">OnClientClick为JS验证

function setImagePreview(obj) {
    var docObj = obj;
    var imgObjPreview = document.getElementById("preView");
    if (docObj.files && docObj.files[0]) {
        var file = docObj.files[0];
        if (!checkCondition(file.name)) {
            clearLogo();
            return;
        }

        if ('FileReader' in window) {
            var reader = new FileReader();
            reader.onload = function(e) {
                imgObjPreview.setAttribute("src", e.target.result);
            }
            reader.readAsDataURL(docObj.files[0]);
        }

        else
            imgObjPreview.src = window.URL.createObjectURL(file);


        //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
        var localImagId = document.getElementById("div_view");
        docObj.select();
        localImagId.focus();
        var imgSrc = document.selection.createRange().text;
        if (!checkCondition(imgSrc)) {
            clearLogo();
            return;
        }

        imgObjPreview.style.width = "300px";
        imgObjPreview.style.height = "300px";
        //图片异常的捕捉，防止用户修改后缀来伪造图片
        try {
            imgObjPreview.src = "";
            imgObjPreview.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
            imgObjPreview.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.backgroundColor = "#ffffff";
        document.selection.empty();
    }
    if ($("#txtLength").val() != "" && $("#txtLength").val() != "0") {
        if ($("#CheckSize").is(':checked')) {
            var image = new Image();
            image.src = imgObjPreview.src;
            HeightorWidth(image.height, image.width);
        }
    } else {
        $("#CheckSize").attr("checked", false); //重置
    }
    return true;
}
function checkCondition(name) {
    var limitSize = 200 * 1024;

    if (!/.(gif|jpg|jpeg|png)$/.test(name)) {
        alert("Can only upload the GIF | JPG | jpeg | PNG format images");
        return false;
    }

    return true;
}

  protected void btnSave_Click(object sender, System.EventArgs e)
        {
            try
            {
                string ext = System.IO.Path.GetExtension(fuPhoto.PostedFile.FileName).ToLower();
                string filename = "product_" + DateTime.Now.ToString("yyyyMMddHHmmss") + ext;
                string path = "~/UploadPhoto/" + filename;
                if (!Directory.Exists(this.Server.MapPath("~/UploadPhoto/")))
                {
                    Directory.CreateDirectory(this.Server.MapPath("~/UploadPhoto/"));
                }

                fuPhoto.PostedFile.SaveAs(Server.MapPath(path));
            }
        }