Add console.profile statements to JavaScript/jQuery code on the fly.
- by novogeek
Hi folks,
We have a thick client app using jQuery heavily and want to profile the performance of the code using firebug's console.profile API. The problem is, I don't want to change the code to write the profile statements. Take this example:
var search=function(){
this.init=function(){
console.log('init');
}
this.ajax=function(){
console.log('ajax');
//make ajax call using $.ajax and do some DOM manipulations here..
}
this.cache=function(){
console.log('cache');
}
}
var instance=new search();
instance.ajax();
I want to profile my instance.ajax method, but I dont want to add profile statements in the code, as that makes it difficult to maintain the code.
I'm trying to override the methods using closures, like this: http://www.novogeek.com/post/2010/02/27/Overriding-jQueryJavaScript-functions-using-closures.aspx but am not very sure how I can achieve. Any pointers on this? I think this would help many big projects to profile the code easily without a big change in code.
Here is the idea. Just run the below code in firebug console, to know what I'm trying to achieve.
var search=function(){
this.init=function(){
console.log('init');
}
this.ajax=function(){
console.log('ajax');
//make ajax call using $.ajax and do some DOM manipulations here..
}
this.cache=function(){
console.log('cache');
}
}
var instance=new search();
$.each(instance, function(functionName, functionBody){
(function(){
var dup=functionBody
functionBody=function(){
console.log('modifying the old function: ',functionName);
console.profile(functionName);
dup.apply(this,arguments);
console.profileEnd(functionName);
}
})();
console.log(functionName, '::', functionBody());
});
Now what I need is, if i say instance.ajax(), I want the new ajax() method to be called, along with the console.profile statements. Hope I'm clear with the requirement. Please improvise the above code.
Regards,
Krishna,
http://www.novogeek.com
