Home Web Front-end JS Tutorial asp.net+jquery.form method to implement asynchronous uploading of images (with jquery.form.js download)_jquery

asp.net+jquery.form method to implement asynchronous uploading of images (with jquery.form.js download)_jquery

May 16, 2016 pm 03:02 PM
asp.net

本文实例讲述了asp.net+jquery.form实现图片异步上传的方法。分享给大家供大家参考,具体如下:

首先我们需要做准备工作:

jquery 点击此处本站下载

jquery.form.js 点击此处本站下载

页面JqueryFormTest.aspx:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="JqueryFormTest.aspx.cs" Inherits="JqueryFormTest" %>
<!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 runat="server">
 <title></title>
 <script src="JS/jquery-1.8.0.js" type="text/javascript"></script>
 <script src="JS/jquery.form.js" type="text/javascript"></script>
 <script type="text/javascript">
  $(function () {
   $("#btn").click(function () {
    $("#fm1").ajaxSubmit({
     url: "img.ashx",
     type: "post",
     success: function (data) {
      alert(data);
      //IE显示图片会默认加上<PRE>
,着必须要把去除掉才能在低版本ie显示 data = data.replace("
", "").replace("
", ""); $("#divimg").append(""); //清空file控件里面的值 var file = $("#btnfile"); file.after(file.clone().val("")); file.remove(); } }); }); })

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img.ashx:

<%@ WebHandler Language="C#" Class="img" %>
using System;
using System.Web;
public class img : IHttpHandler {
 public void ProcessRequest (HttpContext context) {
  context.Response.ContentType = "text/plain";
  //获取上传的文件的对象
  HttpPostedFile img = context.Request.Files["btnfile"];
  //获取上传文件的名称
  string s = img.FileName;
  //截取获得上传文件的名称(ie上传会把绝对路径也连带上,这里只得到文件的名称)
  string str = s.Substring(s.LastIndexOf("\\") + 1);
  string path = "~/upload/"+ str;
  //保存文件
  img.SaveAs(context.Server.MapPath(path));
  //HttpRuntime.AppDomainAppVirtualPath主要是获取应用程序虚拟路径名称,因为响应给页面时不会自动添加而导致无法显示图片
  context.Response.Write(HttpRuntime.AppDomainAppVirtualPath + path.Substring(1));//path.Substring(1)用来去除第一个~字符
 }
 public bool IsReusable {
  get {
   return false;
  }
 }
}

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更多关于jQuery相关内容感兴趣的读者可查看本站专题:《jQuery切换特效与技巧总结》、《jQuery拖拽特效与技巧总结》、《jQuery扩展技巧总结》、《jQuery常见经典特效汇总》、《jQuery动画与特效用法总结》、《jquery选择器用法总结》及《jQuery常用插件及用法总结

希望本文所述对大家jQuery程序设计有所帮助。

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