在javascript中将文本上传到asp.net通用处理程序

Question

How can I upload text written by the user to an asp.net generic handler? the text is pretty lengthy.

Answer 1

Looking at the code from your comment (thanks for sharing), it seems like the parameter containing your text is called data in your JavaScript and you are looking for file in your handler.

Try: context.Request.Form["data"] in your handler.

Answer 2

Try some jQuery code like this:

jQuery(document).ready(function($){
    $('#button-id-to-submit-info-to-the-handler').on('click', function(ev) {
        ev.preventDefault();

        //Wrap your msg in some fashion
        //in case you want to end other things
        //to your handler in the future
        var $xml = $('<root />')
            .append($('<msg />', { 
                text: escape($('#id-of-your-textarea-that-has-the-text').val()) 
            }
        ));

        $.ajax({
            type:'POST',
            url:'/path/to-your/handler.ashx',
            data: $('<nothing />').append($xml).html(),
            success: function(data) {
                $('body').prepend($('<div />', { text: $(data).find('responsetext').text() }));
            }
        });
    });
});

And in your handler:

public class YourHandler : IHttpHandler
{
   public void ProcessRequest(HttpContext ctx)
   {
       //Response with XML
       //Build a response template
       ctx.Response.ContentType = "text/xml";
       String rspBody = @"<?xml version=\""1.0\"" encoding=\""utf-8\"" standalone=\""yes\""?>
<root>
    <responsetext>{0}</responsetext>
</root>";

      //Get the xml document created via jquery
      //and load it into an XmlDocument
      XmlDocument xDoc = new XmlDocument();
      using (System.IO.StreamReader sr = new StreamReader(ctx.Request.InputStream))
      {
         String xml = sr.ReadToEnd();
         xDoc.LoadXml(xml);
      }

      //Find your <msg> node and decode the text
      XmlNode msg = xDoc.DocumentElement.SelectSingleNode("/msg");
      String msgText = HttpUtility.UrlDecode(msg.InnerXml);
      if (!String.IsNullOrEmpty(msgText))
      {
          //Success!!
          //Do whatever you plan on doing with this
          //and send a success response back
          ctx.Response.Write(String.Format(rspBody, "SUCCESS"));
      }
      else
      {
          ctx.Response.Write(String.Format(rspBody, "FAIL: msgText was Empty!"));
      }
   } 
}