Rails spinoffs - Jul 2007 - ASP.NET AJAX Web Services and Prototype Version 1.5.1.1

I wanted to use a web service published with ASP.NET AJAX from
Prototype Version 1.5.1.1

It''s easier to call an ASP.NET AJAX web service by using an ASP.NET
AJAX page with a proxy class, but I have an application which still
has many Classic ASP pages and using Prototype seemed like a better
idea than hand coding the the interactions, or figuring out how to
include all the right ASP.NET AJAX libraries and use a proxy class.

ASP.NET AJAX expects to be sent JSON and the return JSON, but not in
the exact same manner that Prototype seems to expects it.  I made some
minor adjustments to Prototype to get it to work.

Here is some sample code that calls the service:

new Ajax.Request(''User.asmx/GetUserId'', {
 method:''post'',
 contentType: ''application/json'',
 postBody : {lsUserName : $(''uoManagerUsername'').value,
lsCatalogName : $(''uoMainCatalog'').value},
 onSuccess: function(transport, json){
   var lnId = eval(json);
   if ($(''uoManagerUsername'').value ==
''none'') lnId=0;
   if (lnId >= 0) {
    $(''uoManagerUsernameText'').innerHTML = $
(''uoManagerUsername'').value;
    $(''uoManagerUsername'').value = '''';
    $(''uoManagerId'').value = lnId;
   } else alert(''"'' +
$(''uoManagerUsername'').value + ''" was not
found.'');
   $(''uoChangeManagerButton'').disabled = false;
   }
  });

I started messing with the "parameters" first, but switched to using
"postBody" because it required less code changes to Prototype.

These are my Prototype changes:

Replace this at line 1047:

      this.body = this.method == ''post'' ?
(this.options.postBody ||
params) : null;
      this.transport.send(this.body);

With this:

      if (this.options.contentType.indexOf(''json'') >= 0) {
				this.transport.send(Hash.toJSON(this.options.postBody));
      } else {
	      this.body = this.method == ''post'' ?
(this.options.postBody ||
params) : null;
				this.transport.send(this.body);
      }

Replace this at line 1145:

  evalJSON: function() {
    try {
      var json = this.getHeader(''X-JSON'');
      return json ? json.evalJSON() : null;
    } catch (e) { return null }
  },

With this:

  evalJSON: function() {
    try {
      var json = this.getHeader(''X-JSON'');
      var contentType = this.getHeader(''Content-type'');
      if (!json && contentType.indexOf(''json'')>=0)
json this.transport.responseText;
      return json ? json.evalJSON() : null;
    } catch (e) { return null }
  },

I don''t think these changes broke anything that it already did, and it
now works to send JSON and received JSON from an ASP.NET AJAX web
service.


--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---