Umberto,
Thank you for the suggestion. I had actually done that before, but was
looking for a less intrusive way of setting this up.
As it turns out I was close, this is what I finally ended up with:
function decorateOpenLayersAjax(f) {
return function() {
var startT = new Data();
var answer = f.apply(OpenLayers.Request, arguments);
try {
var deltaT = ((new Date()).getTime() -
startT.getTime())/1000.0;
logtime(deltaT);
}
finally {
return answer;
}
};
}
Then this works:
OpenLayers.Request.issue =
decorateOpenLayersAjax(OpenLayers.Request.issue);
Its a nice clean what of doing this so you intercept all ajax requests
independently of how your application is built.
-Steve
On 2/2/2013 3:50 AM, Umberto Nicoletti wrote:
I would use an event listener instead:
start the timer on complete event
stop andlog it on success or failure
hth,
Umberto
On Saturday, February 2, 2013, Stephen Woodbridge wrote:
Hi All,
I am trying to add some tracking code to my OpenLayers app so I can
track performance of ajax requests. So my plan was to decorate the
OpenLayers.Request.issue function to log the time before and after
the issue().
Something like:
function decorateOpenLayersAjax(f) {
var startT = new Data();
var answer = f.apply(this, arguments);
try {
var deltaT = ((new Date()).getTime() - startT.getTime())/1000.0;
logtime(deltaT);
}
finally {
return answer;
}
}
And then in my init() function:
OpenLayers.Request.issue =
decorateOpenLayersAjax(__OpenLayers.Request.issue);
My page loads fine, but on the first ajax request I get the error:
TypeError: a.headers is undefined
which implies that my decoration is breaking the code in:
"ol212/lib/OpenLayers/Request.__js" line 165
issue: function(config) {
// apply default config - proxy host may have changed
var defaultConfig = OpenLayers.Util.extend(
this.DEFAULT_CONFIG,
{proxy: OpenLayers.ProxyHost}
);
config = OpenLayers.Util.applyDefaults(__config,
defaultConfig);
It seems that this.DEFAULT_CONFIG no longer points to the original
object where it is defined.
Any ideas on how to do this, or a better way to do this would be
appreciated.
-Steve
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