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我让用户上传图片,效果很好。如果用户第一次加载页面,该图像也会显示在Web表单上。刚刚上传的显示图片
问题是当用户上传另一个图像(替换图像)我想新的图像显示在页面上(使用ajax),但没有显示任何内容。
网页表单:
<asp:TextBox ID="txtVllID" runat="server" /><br />
<asp:Image ID="imgUploaded" runat="server" /><br />
服务器端脚本:
Public Sub Page_Load(ByVal sender As Object, ByVal args As EventArgs)
If Page.IsPostBack Then
Exit Sub
End If
'initieren
txtVllID.Text = Nothing
txtVllID.Text = Request.QueryString("vllid")
imgUploaded.ImageUrl = "ImageHandler.ashx?vllid=" & txtVllID.Text
End Sub
ImageHandler.ashx
<%@ WebHandler Language="VB" Class="ImageHandler" %>
Imports System
Imports System.Web
Imports System.IO
Public Class ImageHandler : Implements IHttpHandler
Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
Dim vllid = HttpContext.Current.Request.QueryString("vllid")
context.Response.ContentType = "image/jpeg"
context.Response.WriteFile("App_Themes/theme_yellow/uploads/" + vllid + ".jpg")
End Sub
Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
Get
Return False
End Get
End Property
End Class
jQuery脚本:
<script type="text/javascript">
$(document).ready(function() {
var settings = {
url: "FileUploadHandler.ashx?vllid=" + $("#txtVllID").val(),
allowedTypes: "jpg,jpeg,png,gif",
onSuccess: function (files, response, xhr) {
$.ajax({
url: "ImageHandler.ashx?vllid=" + $("#txtVllID").val(),
datatype: "image/jpg",
success: function (data) {
//console.log(data); you see imagedata?(bytes?)
$("#imgUploaded").attr("src", data);
}
});
$("#divGelukt").show("slow", function() { });
}
}
$("#UploadArea").uploadFile(settings);
});
</script>
在屏幕上图像不可见。当我查看浏览器中的结果代码时,imgUploades.src包含不可读的字符。我怎样才能让它成为一个图像?