events: connection exceptions, chaining events & canceling

[end-user]

As I've posted previously, I'd like to setup a global connection handler. Essentially, I want to do something similar in concept to the basic login tutorial; I want to capture and handle 403 statuses. If any XHR request results in a 403 status, I want to cancel, gracefully, the requesting event (which could be a loader), and launch a separate process. It would be cool if, after that process was done, it could resume the initiator, but it has to at least cancel it. I'd also like the listener to act as an interceptor - if the response is not a 403, chain to whatever failure handler would normally receive the event. Can someone tell me if this can be done, and what I'd need to do to make it happen?

TIA

[hendricd]

See ext-basex (in my sig below). It enhances the ext-base adaptor to handle all that with native Ext events.

[end-user]

Ok, so, I'm trying it out. When I add it to an already working page, I get an error about this.headers not being defined. Is there something special I need to do to implement it?

[hendricd]

Some code and stacktrace might help

[end-user]

Well, ok - I'm using a simple TreeLoader to make a call (actually twice, the first is the lazy load, the second expands a node):

tree=new T.TreePanel({
	title: "review items",
	animate:false,
	enableDD:false,
	lines:false,
	frame:true,
	autoHeight:true,
	autoScroll:true,
	rootVisible:true,
	loader: new T.TreeLoader({
		dataUrl:"/foundry/forge/test3.cfm"
	}),
	root: new T.AsyncTreeNode({
	text:"Districts"
	,listeners:{
		expand:{
			fn:function(){
				var N=tree.getNodeById(d)
				N.expand(); N.getUI().getEl().scrollIntoView();
			},single:true
		}
	}
	,id:"district"
	})
})

And this results:

this.headers is undefined
http://localhost/srsdss/js/ext/ux/ext-basex.js
Line 546

request()()	ext-basex.js (line 546)
request()(Object url=/foundry/forge/test3.cfm scope=Object)	ext-all-debug.js (line 5106)
requestData()([Node district] loaded=false loading=true childrenRendered=false, function())	ext-all-debug.js (line 23859)
load()([Node district] loaded=false loading=true childrenRendered=false, function())	ext-all-debug.js (line 23816)
expand()(undefined, undefined, undefined)	ext-all-debug.js (line 23162)
fn()()	cN_formInit.js (line 83)
createSingle()()	ext-all-debug.js (line 1397)
fire()()	ext-all-debug.js (line 1488)
fireEvent()()	ext-all-debug.js (line 1184)
afterExpand()()	ext-all-debug.js (line 16098)
onExpand()(true, undefined)	ext-all-debug.js (line 28119)
expand()(undefined)	ext-all-debug.js (line 16080)
onCheckClick()()	ext-all-debug.js (line 28124)
h()()	ext-all-debug.js (line 1613)
getTime()()	yahoo-do...-event.js (line 8)

[Break on this error] var cType = this.headers['Content-Type']||null;

[hendricd]

Hmm..

The default value for this(Ext.lib.Ajax).headers should be {}.

If you 'break' on that error what is 'this' and/or what is the value of this.headers?

Are you clearing out the default headers somewhere else?

[hendricd]

Ah, I see now.

ext-basex is designed to enhance the Ext base adaptor only. Not the YUI adapter.

[end-user]

Yep; when I break on that line, 'this' is a queueManager object; there are no headers defined.

this  =  Object queueManager=Object queueAll=false activeRequests=0
cType  =  undefined
cb  =  Object scope=Object argument=Object timeout=30000
data  =  "node=district"
h  =  undefined
hs  =  false
method  =  "POST"
options  =  Object async=true headers=false proxied=false
q  =  undefined
qm  =  undefined
qname  =  undefined
req  =  undefined
uri  =  "/foundry/forge/test3.cfm"
y  =  2

No, I'm not monkeying with anything; it should all be straight defaults. My includes:

<script src="/js/yui/core/build/yahoo-dom-event/yahoo-dom-event.js"></script>
<script src="/js/yui/core/build/container/container-min.js"></script>
<script src="/js/yui/core/build/utilities/utilities.js"></script>
<script src="/js/ext/core/adapter/yui/ext-yui-adapter.js"></script>
<script src="/js/ext/core/ext-all-debug.js"></script>
<script src="/js/ext/ux/ext-basex.js"></script>
<script src="/js/ext/ux/Ext.ux.Plugin.RemoteComponent.js"></script>
<script>Ext.BLANK_IMAGE_URL = "/imgs/s.gif";</script>
<script src="/js/common.js"></script> 

I did make this change on line 11551 of ext-all-debug.js, however, if that makes any difference

[end-user]

Oh. Ok, well, I reassert my original post, then.

[hendricd]

Ext.Ajax does have a requestexception event available to you. Check the docs.