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I need to trace the javascript and web traffic upon clicking on a button in a certain page (POSTing).
I'd like to go about the code step by step. Is there a way to do that? (Not debugging my code, I need to see what happens in the browser to any site)
If you're looking to debug from the client side I find Google Chromes in built tools to be pretty handy.
You can find a nice introduction / overview of them here
http://getfirebug.com/
Firebug integrates with Firefox to put a wealth of web development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.
Fiddler is wonderful: http://fiddler2.com/fiddler2/. It acts as a proxy, allowing you to inspect every step of the request/response cycle.
If you are on Windows, try HTTP Debugger as well.
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Is there a PHP-enabled webserver, that is tailor-made for debugging?
I want to be able to step thru code, both php and javascript. There has to
be something that makes web development less painful,
but it does not seem to be mainstream, or maby my google-fu is failing me.
Any help appritiated.
If you're on a windows machine, WampServer should does the job. It has XDebug which is really helpful. Regrading JavaScript Firebug and Chrome Dev-Tools are great. Except the web-server itself or PHP extensions like XDebug, a powerful IDE can help you a lot as well.
Within your source-code, Exception Handling could be extremely useful -- echo, print_r, var_dump and die are the other useful options, but not as powerful as Exceptions when it comes to get rid of a bug. console.log comes really handy in JavaScript as well.
Xdebug is what we use at the company I work at. It provides full stack information that is really helpful when trying to determine where something went wrong in the codebase.
Here's an example of the error messages you'll get with it.
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I am trying to make a cross-browser plugin that detects images from a webpage like imgur and pinterest. I have been looking at crossrider...is that a good option? the API is tricky to understand. If anyone has experience with something like this or can give me a good starting point, i would really appreciate it.
In general, the Crossrider framework supports cross browser extension development and provides APIs and plugins to make it easier, but at the end of the day it's up to you to evaluate the framework and see whether it meets your needs. The tutorial you quoted relates to creating a bookmarklet extension and does not pertain to images.
For your specific requirement, there is an images plugin (see the Plugins page) that facilitates working with images on a page.
As #Lix correctly mentions, this is not the place to ask such general questions and hence I recommend that you start by reading the Crossrider docs and searching the forum. If you have any further general questions, email them to support#crossrider.com.
Of course, if you have any specific code related questions, Stack Overflow is another great place to get answers ;-)
[Disclosure: I am a Crossrider employee]
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Can anybody tell me what is the library used here
I have to do a website like this one so if anyone has encounter this library please let me know.
Thanks in advance.
Don't you have a Web Browser. They are quite common nowadays. You could download one from here: https://www.google.com/chrome/ and then use the built-in developer tools (F12) to see which scripts are included:
Hit F12 in chrome and after expanding head tag you can see all the libraries used in that site.
No library is used to do it. The code to do it was written by the website author. Good luck.
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Is there a script that provides similar functions as Google Chrome javascript console?
I said script? I mean emulator, shell, something with which I can automate my simple actions:
Go to page
Open javascript console
Type there a function
Catch output.
In other words, I need any program running custom javascript on web page.
Or any program accessing js browser console.
If I understand your question correctly, PhantomJS may be what you are looking for.
PhantomJS is a headless WebKit scriptable with a JavaScript API. It has fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas, and SVG.
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I've searched a lot about stress testing a NodeJs application/module but I didn't find anything.
I have a push server application (something like socket.io) and I want to test it to ensuring there's no memory leaks and that it exhibits optimal performance.
What's the best method or tools for doing that?
You do not need any special tool for load testing Node.js application. You can use any load test tools:
ApacheBench
Siege
Jmeter
Tsung
From opensource and free tools I can recommend JMeter. As it has built-in Proxy Server which can record HTTP traffic. Advantage of JMeter than other tools is user friendly GUI. You can find article related Node.js load balancing and JMeter testing.
Try this phanos stress test tool. This is phantomjs based tool, and you can loading ajax request too with it. But this tool doesn't provide stat info, you should use nodetime (or something else) for analyze the traffic performance.