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Javascript 使用ajax与C#获取文件大小实例详解

时间:2024-3-2 07:40     作者:韩俊     分类: Javascript


Javascript ajax实现获取文件大小的方法。

顾名思义,通过JS和Ajax来获取上传文件的大小,在上传之前可以有个判断,对上传的文件有所控制,因为js控制文件大小(JS获取文件大小)有些问题,具体大家试下就知道了,在此整理了一下ajax的获取文件大小的方法,比较好用,再调试过程中,出现了c:/fakepath/ 的错误,也将解决方案罗列在下面,以供大家参考

废话少说,代码如下

JS如下:

<script language="Jscript">
function chksize(){
 var ticketType = "Oil";
 var file1=document.getElementById("txtfile");
 var v = file1.value;
 file1.select();
 var realpath = document.selection.createRange().text;
 var input = "<Record><Type>TicketLoanResult</Type><TicketType>" + realpath + "</TicketType></Record>";
 var objXmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
 objXmlHttp.Open("POST", "XMLHttpPost.aspx", false);
 objXmlHttp.Send(input);
 var returnXml = objXmlHttp.responseText;
 if(returnXml!=null)
 {
  returnXml=parseInt(returnXml/1024/1024);
 }
 alert(returnXml); 
 return false; 
}
</script>

后台C#代码:

public partial class XMLHttpPost : System.Web.UI.Page
{
 protected void Page_Load(object sender, EventArgs e)
 {
 try
 {
  XmlDocument xmlDocumenet = new XmlDocument();
  xmlDocumenet.Load(Request.InputStream);
  string type = xmlDocumenet.SelectSingleNode("descendant::Type").InnerText;
  string returnMessage = string.Empty;
  switch (type.Trim())
  {
  case "TicketLoanResult":
   returnMessage = GetTicketLoanResult(xmlDocumenet);
   break;
  default:
   break;
  }
  Response.ContentType = "text/xml";
  Response.Write(returnMessage);
 }
 catch (Exception exceptional)
 {
  //如果有???t返回??信息(Xml格式)
  string errorMessage = "<Error>" + exceptional.Message + "</Error>";
  Response.ContentType = "text/xml";
  Response.Write(errorMessage);
 }
 finally
 {
  Response.End();
 }
 }
 private string GetTicketLoanResult(XmlDocument input)
 {
 XmlNode item = input.SelectSingleNode("descendant::TicketType");
 string ticketType = item.InnerText.Trim();
 FileStream stream = new FileStream(ticketType,FileMode.Open);
 return stream.Length.ToString();
 }
}

js ajax获取文件大小,实例代码!

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标签: javascript

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