Using LoadVars sendAndLoad instead of WebService when calling web services with Flash ActionScript

by filip 14. August 2008 14:53

I've ran into issues using the WebService object in Flash.  The thing is incredibly buggy.  In certain cases, it works just fine, but in other cases, it flat out does not work. In my last case, the web service loaded perfectly fine (onLoad was called), but the PendingCall would not return anything.  The onFault method was never called after I invoked my web service call, but the web service never returned either.  Examining the outgoing messages from Flash (using HTTP headers in Firefox) revealed that Flash was never even attempting to call the web service.  Flash did correctly acquire the crossdomain.xml file (which allowed access from all domains), and it did load the WSDL.  But, for whatever reason, it did not call the web method like it was supposed to.

Well, after a few hours or attempging to make this work, I gave up with the WebService object.  Instead, I went to the LoadVars object, something I'm more confident in than the WebService class, simply due to the fact that it has been around much longer and has had more attention from the Adobe / Macromedia team.

Using the WebService object, my code looked like the following:

var _wsdl:String = "http://www.bloodforge.com/webservice.asmx?WSDL"; // <- this is fake for the purpose of this blog 
var MailService:WebService = new WebService(_wsdl);
MailService.onLoad = function()
{
  var MailServiceResult:PendingCall = MailService.MyMethod("my parameters");
  MailServiceResult.onFault = function(fault)
  {
    trace("it never gets here even though it fails!");
  }
  MailServiceResult.onResult = function(result)
  {
    trace("it never got here either!");
  }
}

The above was replaced with the code below, and it works perfectly fine:

var result_lv:LoadVars = new LoadVars();
result_lv.onData = function(responseStr:String)
{
  if(responseStr == undefined)
  {
    trace("Error occurred!");
  }
  else
  {
    trace("Success... parse my data below...");
  }
}
var send_lv:LoadVars = new LoadVars();
send_lv.myWebServiceParam1 = "param 1";
send_lv.myWebServiceParam2 = "param 2";
send_lv.sendAndLoad("http://www.bloodforge.com/webservice.asmx/MyMethod", result_lv, "POST");

 
Oh, and make sure that if you do this with your web service, that you have the following line in your web.config file.  Otherwise, you won't be able to access it using these methods (you should be familiar w/ it anyways if you use Ajax to call web services).

<webServices>
  <
protocols
>
    <
add name="HttpGet"
/>
    <
add name="HttpPost"
/>
  </
protocols
>
</
webServices>

Tags: , ,

Web Development

IE8 and AjaxControlToolkit - Visibility bug

by filip 18. June 2008 14:08

Well, I finally downloaded IE8 to see how some of the sites I've worked on behave.  Most things work just fine, however, I did find a pretty significant problem with the AjaxControlToolkit.

I've been using the Tab control quite a bit, and I noticed that, when switching between tabs, the new tab was not showing up.  The old tab was hiding, though... 

Debugging has led me to the setVisible method located in "Common/Common.js" in the AjaxControlToolkit.  Specifically, the problem existed in the following code:

if (element && value != $common.getVisible(element))
{
  if (value) 
  {
    if (element.style.removeAttribute)
    {
      element.style.removeAttribute("display"
);
    }
    else

   
{
     
element.style.removeProperty(
"display"
);
   
}
 
}
 
else
 
{
    
element.style.display
= 'none'
;
 
}
 
element.style.visibility
= value ? 'visible' : 'hidden';
}

In the above code, removeAttribute() was being called, but the display attribute remained (display=none).  I looked up the removeAttribute method, and it does return a boolean value indicating if the method was successful or not.  Well, as it turns out, the method (for whatever reason) is not successul in IE8!

I'm not sure why this fails in IE8, but it does cause a problem.  Fortunately, there's a pretty quick fix to this:

if (element && value != $common.getVisible(element))
{
  if
(value) 
  {
    if
(element.style.removeAttribute)
    {
            if(!element.style.removeAttribute("display"))
            {
               element.style.display
= ''
;
            }

    }
   
else
   
{
     
element.style.removeProperty(
"display"
);
   
}
 
}
 
else
 
{
    
element.style.display
= 'none'
;
 
}
 
element.style.visibility
= value ? 'visible' : 'hidden';
}

Tags: , ,

Web Development

Microsoft JScript runtime error: 'null' is null or not an object

by filip 28. May 2008 12:44

Programming JavaScript can be fun, but sometimes when I get errors like this it can get a little frustrating...

 

It happened on the following line, where the variable 'o' was null:

o.onmousedown = Drag.start;

Tags: ,

Web Development

'AjaxControlToolkit' is undefined (javascript)

by filip 8. May 2008 13:14

I got this annoying error recently in a website I've been working on.  It worked perfectly fine locally, it worked fine after uploading to the web server on my machine and other machines in the lab (various browsers).  Then, it turns out, it doesn't work on (one of) the client's machines.  Of course, I'm unable to replicate the error locally.

I looked around and it seems the first solution was to clear the cache.  A lot of people said that Ctrl+F5 works, others said they needed to manually clear the cache and then restart the browser.  Well, neither of those worked.

Fortunatelly, the solution turned out to be pretty easy:  Set the "CombineScripts" property of the ToolkitScriptManager to false.

 <ajaxToolkit:ToolkitScriptManager runat="server" ID="ajaxScriptManager" EnablePartialRendering="true" CombineScripts="false" />

Tags: , ,

Web Development | Web Development

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About Filip Stanek

Death Note Pic I'm a developer at ACG in Cincinnati, OH. I like ASP.NET, Flash, and other web technologies, & enjoy playing chess, video games, etc.

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