Question

I been waiting for sometime now to bring my Asp.net Preview 4 project up to snuff, totally skipping Preview 5 just because I knew I would have some issues.

Anyhow, here is the question and dilemma.

I have a few areas on the site which I have an ajax update type panel that renders content from a view using this technique found here. AJAX Panels with ASP.NET MVC

This worked fine in preview 4 but now in the beta I keep getting this ..

Sys.ArgumentNullException: Value cannot be null Parameter name eventObject 

It has been driving me nuts…

My code looks like this

<% using (this.Ajax.BeginForm('ReportOne', 'Reports', null, new AjaxOptions { UpdateTargetId = 'panel1' }, new { id = 'panelOneForm' })) { }  %> <div class='panel' id='panel1'><img src='/Content/ajax-loader.gif' /></div> <script type='text/javascript'>   $get('panelOneForm').onsubmit();  </script> 

so basically what its doing is forcing the submit on the form, which updates panel1 with the contents from the view ReportOne.

What am I missing? Why am I getting this error? Why did they go and change things? I love MVC but this is making me crazy.

Answer 1

Having some irritating problems relating to this issue. Hope someone here can help me out.

 var event = new Object(); function refreshInformation(){ document.forms['MyForm'].onsubmit({preventDefault: function(){} }); } 

This is my current code, it works fine for updating the the form. Problem is the ‘var event’ disrupts all other javascript events, if I have for example this:

 <img src='myimg.gif' onmouseover='showmousepos(event)' /> 

its not the mouse event that’s sent to the function, instead it’s my ‘var event’ that I must declare to get the onsubmit to function properly.

When using only

onsubmit({preventDefault: function(){} }

without the ‘var event’ I get the

Sys.ArgumentNullException: Value cannot be null Parameter name eventObject

I’ve also tried using

submit()

this does a full postback and totally ignores the ajaxform stuff…at least in my solution.

Hmm…I realize this might be a little confusing, but if someone understands the problem, it would be great if you had a solution as well. =) If you need more info regarding the problem please just ask and I’ll try to elaborate som more.