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  • Best practice for assigning A/B test variation based on IP address

    - by mojones
    I am starting to write some code for A/B testing in a Grails web application. I want to ensure that requests from the same IP address always see the same variation. Rather than store a map of IP-variant, is it OK to simply turn the IP address into an integer by removing the dots, then use that as the seed for a random number generator? The following is taking place in a Grails Filter: def ip = request.remoteAddr def random = new Random(ip.replaceAll(/\./, '').toInteger()) def value = random.nextBoolean() session.assignment = value // value should always be the same for a given IP address I know that identifying users by IP address is not reliable, and I will be using session variables/cookies as well, but this seems to be useful for the case where we have a new session, and no cookies set (or the user has cookies disabled).

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  • Abstract Factory Using Generics: Is Explicitly Converting a Specified Type to Generic a Bad Practice

    - by Merritt
    The question's title says it all. I like how it fits into the rest of my code, but does it smell? public interface IFoo<T> { T Bar { get; set; } } public class StringFoo : IFoo<string> { public string Bar { get; set; } } public static class FooFactory { public static IFoo<T> CreateFoo<T>() { if (typeof(T) == typeof(string)) { return new StringFoo() as IFoo<T>; } throw new NotImplementedException(); } } UPDATE: this is sort of a duplicate of Is the StaticFactory in codecampserver a well known pattern?

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  • Can HTML injection be a security issue?

    - by tkbx
    I recently came across a website that generates a random adjective, surrounded by a prefix and suffix entered by the user. For example, if the user enters "123" for prefix, and "789" for suffix, it might generate "123Productive789". I've been screwing around with it, and I thought I might try something out: I entered this into the prefix field: <a href="javascript:window.close();">Click</a><hr /> And, sure enough, I was given the link, then an <hr>, then a random adjective. What I'm wondering is, could this be dangerous? There must be many more websites out there that have this issue, are all of them vulnerable to some sort of php injection?

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  • I am trying to get a simple jqplot example going but it will not display, why not?

    - by stephenmm
    Here is the entire contents of the file: <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>jqPlot Examples</title> <!--[if IE]><script language="javascript" type="text/javascript" src="excanvas.js"></script><![endif]--> <script language="javascript" type="text/javascript" src="../jqtouch-1_0_b/jqtouch/jquery.1.3.2.min.js"></script> <script language="javascript" type="text/javascript" src="../javascript/jquery.jqplot.min.js"></script> <link rel="stylesheet" type="text/css" href="../javascript/jquery.jqplot.css" /> </head> <body> <h1>jqPlot Examples</h1> <script id="source" language="javascript" type="text/javascript"> $.jqplot('chartdiv', [[[1, 2],[3,5.12],[5,13.1],[7,33.6],[9,85.9],[11,219.9]]]); </script> div<br> <div id="chartdiv" style="height:400px;width:300px; "></div> div<br> </body> </html> <html> Here is what I see in FF, chrome, IE: jqPlot Examples div div I am seeing no errors in my Apache error log. I know all the .js files are accessible from the html. Does anyone have an idea about why this might not be working?

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  • Best practice for DAO pattern ?

    - by Tony
    I've seen a lot of codes use a service-dao pattern , I don't know the origin of this pattern . It force the front layer call service , then delegates some of the service task to dao. I want to ask : Does DAO layer do purely data access related task ? What about exception encapsulation ? Is there other pattern can be used to replace this ?

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  • Best Practice: Legitimate Cross-Site Scripting

    - by Ryan
    While cross-site scripting is generally regarded as negative, I've run into several situations where it's necessary. I was recently working within the confines of a very limiting content management system. I needed to include database code within the page, but the hosting server didn't have anything usable available. I set up a couple barebones scripts on my own server, originally thinking that I could use AJAX to import the contents of my scripts directly into the template of the CMS (thus retaining dynamic images, menu items, CSS, etc.). I was wrong. Due to the limitations of XMLHttpRequest objects, it's not possible to grab content from a different domain. So I thought "iFrame" - even though I'm not a fan of frames, I thought that I could create a frame that matched the width and height of the content, so that it would appear native. Again, I was blocked by cross-site scripting "protections." While I could indeed load a remote file into the iFrame, I couldn't execute JavaScript to modify its size on either the host page or inside the loaded page. In this particular scenario, I wasn't able to point a subdomain to my server. I also couldn't create a script on the CMS server that could proxy content from my server, so my last thought was to use a remote JavaScript. A remote JavaScript works. It breaks when the user has JavaScript disabled, which is a downside; but it works. The "problem" I was having with using a remote JavaScript was that I had to use the JS function document.write() to output any content. Any output that isn't JS causes script errors. In addition to using document.write() for every line, you also have to ensure that the content is escaped - or else you end up with more script errors. My solution was as follows: My script received a GET parameter ("page") and then looked for the file ({$page}.php), and read the contents into a variable. However, I had to use awkward buffering techniques in order to actually execute the included scripts (for things like database interaction) then strip the final content of all line break characters ("\n") followed by escaping all required characters. The end result is that my original script (which outputs JavaScript) accesses seemingly "standard" scripts on my server and converts their standard output to JavaScript for displaying within the CMS template. While this solution works, it seems like there may be a better way to accomplish the same thing. What is the best way to make cross-site scripting work specifically for the purpose of including content from a completely different domain?

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  • Best practice for copying private instance vars with NSCopying

    - by Ben
    I might be missing something obvious here, but I'm implementing NSCopying on one of my objects. That object has private instance variables that are not exposed via getters, as they shouldn't be used outside the object. In my implementation of copyWithZone:, I need alloc/init the new instance, but also set up its state to match the current instance. I can obviously access current private state from inside copyWithZone:, but I can't set it into the new object, because there are no accessors for that state. Is there a standard way around this while still keeping data privacy intact? Thanks.

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  • SharePoint Custom JS file Best Practice

    - by bmw0128
    I made a custom master page. I also made a custom CSS file, which I uploaded to "Style Library". I link to this CSS file by: <SharePoint:CssRegistration name="<% $SPUrl:~SiteCollection/Style Library/coe/mainCOE.css%>" runat="server"/> Now I want to make a custom JS file, and link to it in the custom master page. 1. Where should I upload the JS file, make a folder like the "Style Library"? 2. Is there a SharePoint way to link to the JS file, like the one above for a CSS file?

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  • Common practice for higher-order-polymorphism in scala

    - by raichoo
    Hi, I'm trying to grasp higher-order-polymophism in scala by implementing a very basic interface that describes a monad but I come across a problem that I don't really understand. I implemented the same with C++ and the code looks like this: #include <iostream> template <typename T> class Value { private: T value; public: Value(const T& t) { this->value = t; } T get() { return this->value; } }; template < template <typename> class Container > class Monad { public: template <typename A> Container<A> pure(const A& a); }; template <template <typename> class Container> template <typename A> Container<A> Monad<Container>::pure(const A& a) { return Container<A>(a); } int main() { Monad<Value> m; std::cout << m.pure(1).get() << std::endl; return 0; } When trying to do the same with scala I fail: class Value[T](val value: T) class Monad[Container[T]] { def pure[A](a: A): Container[A] = Container[A](a) } object Main { def main(args: Array[String]): Unit = { val m = new Monad[Value] m.pure(1) } } The compiler complains about: [raichoo@lain:Scala]:434> scalac highorder.scala highorder.scala:5: error: not found: value Container Container[A](a) ^ one error found What am I doing wrong here? There seems to be a fundamental concept I don't seem to understand about scala typeconstructors. Regards, raichoo

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  • Run an ActiveX through Web

    - by balexandre
    We have a webpage that works fine on the local computer as it uses a COM Object that is only available in the local computer. the program generates HTML code: <html> <head> <script type="text/javascript"> <!-- function ResizeControl(){Y = document.body.clientHeight;if (Y < 1) {Y = 1}X = document.body.clientWidth;if (X < 1) {X = 1}ActiveX.width = X;ActiveX.height = Y} --> </script> <style type="text/css">html, body { overflow:hidden; } </style> </head> <body OnResize="ResizeControl()" OnLoad="ResizeControl()" leftmargin="0" topmargin="0" rightmargin="0" bottommargin="0"> <object id="ActiveX" classid="CLSID:8EC68701-329D-4567-BCB5-9EE4BA43D358" width="14" height="14"> <PARAM NAME="tabName" VALUE="Complaints"> </object> </body> </html> and shows fine My question is, How can we port this into a web environment? As the Delphi developer has no idea and I'm not a Delphi fellow. I want to be able to use this "webpage" on a web address http://INTRANET/mysite/thispage.html Any idea, any though, any door to open is greatly appreciate :)

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  • After Adding "readonly" attribute on text box not able to remove it in one event

    - by Sreedhar K
    Steps to repro USE Internet Explorer Check unlimited check box Click on text box (It will remove tick/check from check box) Try to enter text in text box We cannot enter in the text box 4. Click again on the text box. Now we will be able to enter text in the text box We tried by 1. Making attribute readOnly to flase i.e. $('#myinput').attr('readOnly', false); 2. Calling $('#myinput').click(); Below is the HTML code <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Make input read only</title> <script type="text/javascript" src="http://ajax.microsoft.com/ajax/jquery/jquery-1.4.4.min.js"></script> </head> <body> <input id="myinput" type="text" /> <input id="mycheck" type="checkbox" /> <script type="text/javascript"> /*oncheck box click*/ $('#mycheck').click(function () { if ($(this).attr('checked')) { $('#myinput').attr('readOnly', 'readOnly'); } else { $('#myinput').removeAttr('readOnly'); /* also tried * $('#myinput').attr('readOnly', false); * $('#myinput').attr('readOnly', ''); */ } }); /*on text box click*/ $('#myinput').click(function () { $('#mycheck').removeAttr('checked'); $('#myinput').removeAttr('readOnly'); /* also tried * $('#myinput').attr('readOnly', false); * $('#myinput').attr('readOnly', ''); */ }); </script> </body> </html> Live copy

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  • Right way to center a <div> in xhtml?

    - by Meredith
    Im working with a XHTML 1.0 Transitional doctype html file, and I want to have a main div with 800px width and make it appears centered (not the div content, but the div itself). I've used this on the past: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <style> <!-- html, body { margin:0; padding:0; } #main-container { background:black; width:800px; } --> </style> </head> <body> <center> <div id="main-container"> Content </div> </center> </body> </html> But I am not sure if this is cross-browser compatible, or if its valid xhtml.

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  • Best Practice to write Connection string for heavy traffic ASP.NET Web Application

    - by hungrycoder
    What is the best way to define connection string for a web application that has minimum 500 live users on the internet in terms of connection pooling. And load factors to consider? Suppose I have connection string as follows: initial catalog=Northwind; Min Pool Size=20;Max Pool Size=500; data source=localhost; Connection Timeout=30; Integrated security=sspi" as Max Pool Size is 500 and as live users exceed 500 say 520 will the remaining 20 users experience slower page load?? Or what if I have connection string as follows which doesn't talks anything about pooling or Connection time out? How the application behaves then? initial catalog=Northwind; data source=localhost; Integrated security=sspi" I'm using "Using statements" however to access the MYSQL database.

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  • Best practice for writing ARRAYS

    - by Douglas
    I've got an array with about 250 entries in it, each their own array of values. Each entry is a point on a map, and each array holds info for: name, another array for points this point can connect to, latitude, longitude, short for of name, a boolean, and another boolean The array has been written by another developer in my team, and he has written it as such: names[0]=new Array; names[0][0]="Campus Ice Centre"; names[0][1]= new Array(0,1,2); names[0][2]=43.95081811364498; names[0][3]=-78.89848709106445; names[0][4]="CIC"; names[0][5]=false; names[0][6]=false; names[1]=new Array; names[1][0]="Shagwell's"; names[1][1]= new Array(0,1); names[1][2]=43.95090307839151; names[1][3]=-78.89815986156464; names[1][4]="shg"; names[1][5]=false; names[1][6]=false; Where I would probably have personally written it like this: var names = [] names[0] = new Array("Campus Ice Centre", new Array[0,1,2], 43.95081811364498, -78.89848709106445, "CIC", false, false); names[1] = new Array("Shagwell's", new Array[0,1], 43.95090307839151, -78.89815986156464, 'shg", false, false); They both work perfectly fine of course, but what I'm wondering is: 1) does one take longer than the other to actually process? 2) am I incorrect in assuming there is a benefit to the compactness of my version of the same thing? I'm just a little worried about his 3000 lines of code versus my 3-400 to get the same result. Thanks in advance for any guidance.

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  • Is AsParallel() good practice in a web environment?

    - by Bjorn Bailleul
    I have no doubt that for client applications, AsParallel() will bring some out-of-the-box performance gains. But what if I would use it in a web environment. Let's say I have a widget framework that loops over all widgets to get their data and render output. This would parallelize great no? I do have my doubts on using AsParallel() in this scenario. What if I have a large number of visitors for my site, isn't IIS going to use multiple threads to handle all requests? Aren't there going to be locking issues presented after a while, or threads dying because all processors are in use? It's just a thought, what do you think about this?

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  • Best Practice for Utilities Class?

    - by Sonny Boy
    Hey all, We currently have a utilities class that handles a lot of string formatting, date displays, and similar functionality and it's a shared/static class. Is this the "correct" way of doing things or should we be instanciating the utility class as and when we need it? Our main goal here is to reduce memory footprint but performance of the application is also a consideration. Thanks, Matt PS. We're using .NET 2.0

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  • Best practice zend framework + faceBook Api

    - by simple
    What is better way to integrate facebook api, in zend framework, for login I can implement Zend_Auth_Adapter_Interface but I found something like Zend_Service_Twitter, and thinking if I should implement Zend_Service_interface and what are the odds, sorry haven't looked at the architecture of Zend_Service yet, but any advice would be appreciated and would save me time from going to wrong direction

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  • My multipart email script sends HTML messages just fine, but the plain text alternative doesn't not

    - by hsatterwhite
    I have a script set up to send out multipart emails; plain text and html messages. The HTML messages work just fine, but when I used an email client that only does plain text the plaint text message does not render and I get the following: -- This message was generated automatically by Me http://www.somewebsite.com/ $html_msg = $message_details; $plain_text_msg = strip_tags($message_details); $headers = <<<HEADERS From: Me <[email protected]> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="==PHP-alt$mime_boundary" HEADERS; // Use our boundary string to create plain text and HTML versions $message = <<<MESSAGE --==PHP-alt$mime_boundary Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit $plain_text_msg -- This message was generated automatically by Me http://www.somewebsite.com/ If you did not request this message, please notify [email protected] --==PHP-alt$mime_boundary Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: 7bit <html> <body> $html_msg <p> --<br /> This message was generated automatically as a demonstration on <a href="http://www.somewebsite.com/">Me</a> </p> <p> If you did not request this message, please notify <a href="mailto:[email protected]">[email protected]</a> </p> </body> </html> --==PHP-alt$mime_boundary-- MESSAGE;

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  • Best practice - When to evaluate conditionals of function execution

    - by Tesserex
    If I have a function called from a few places, and it requires some condition to be met for anything it does to execute, where should that condition be checked? In my case, it's for drawing - if the mouse button is held down, then execute the drawing logic (this is being done in the mouse movement handler for when you drag.) Option one says put it in the function so that it's guaranteed to be checked. Abstracted, if you will. public function Foo() { DoThing(); } private function DoThing() { if (!condition) return; // do stuff } The problem I have with this is that when reading the code of Foo, which may be far away from DoThing, it looks like a bug. The first thought is that the condition isn't being checked. Option two, then, is to check before calling. public function Foo() { if (condition) DoThing(); } This reads better, but now you have to worry about checking from everywhere you call it. Option three is to rename the function to be more descriptive. public function Foo() { DoThingOnlyIfCondition(); } private function DoThingOnlyIfCondition() { if (!condition) return; // do stuff } Is this the "correct" solution? Or is this going a bit too far? I feel like if everything were like this function names would start to duplicate their code. About this being subjective: of course it is, and there may not be a right answer, but I think it's still perfectly at home here. Getting advice from better programmers than I is the second best way to learn. Subjective questions are exactly the kind of thing Google can't answer.

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  • Why doesn't this image sprite menu display properly, and why aren't the links working?

    - by briligg
    The code validates. There should be two more images in the menu on the left, above the visible one of the silo. And each should be a link. http://www.briligg.com/agnosticism.html css is: external style sheet: .menu { position: relative; float: left; margin: 10px; padding: 0; width: 150px; } .menu li { margin: 0; padding: 0; list-style: none; position: absolute; left: 0; top: 260px; } .menu li, .menu a { width: 150px; height: 150px; } internal style sheet: .menu { height: 450px; } .mirror { top: 0; } .mirror { background: url(http://www.briligg.com/images/menu-ag.png) 0 0; } .wormcan { top: 151px; } .wormcan { background: url(http://www.briligg.com/images/menu-ag.png) 0 -151px; } .wormsilo { top: 301px; } .wormsilo { background: url(http://www.briligg.com/images/menu-ag.png) 0 -301px; } html: <ul class="menu"> <li class="mirror"> <a href="whoryou.html"></a> </li> <li class="wormcan"> <a href="aroundyou.html"></a> </li> <li class="wormsilo"> <a href="beyondyou.html"></a> </li> </ul>

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  • Disable MathML output of eLyXer

    - by Gryllida
    eLyXer is a standalone LyX to HTML converter. In the resulting file, equations are formatted as MathML, and the file itself starts with an XML tag. This causes two problems: LibreOffice does not read the XML file (it can read HTML files, but not XHTML). I am unable to copy and paste the equations into a document editor such as LibreOffice with the goal of subsequent conversion into .doc, because .doc files do not support MathML. The eLyXer help page mentions an option to only use simple math, but there is no option to set math equations to output as images. And I already set Document Settings Output Math equations Format: images in LyX, which presumably is saved in the lyx document somewhere. A web search did not come up with any solutions.

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  • Html 5 ping pong game side collision problem

    - by Gurjit
    I am making a simple ping pong game where I am facing a side collision problem means when the ball collides with the either side of the paddle . Although I have written code for making it works but something is failing....I want plz someone to give suggestions and tell how to avoid it. Means while trying to hit the ball with side face of the paddle poses a problem.!! Here is the main part of the code causing problem function checkCollision(){ ///// This is collision detection for the upper part ///// if( cy + radius >= paddleTop && cx + radius > paddleLeft && cy + radius >= paddleTop + 5 && cx - radius <= paddleLeft + paddleWidth ) { dy = -dy; ++hits; /// On collision we are increasing the Score playSound(); } else if( cy + radius >= paddleTop && cy + radius <= paddleTop + paddleHeight && cx + radius >= paddleLeft && cy - radius <= paddleLeft - (radius + 1) ) { dx = -dx; } } here is working fiddle for it :- http://jsfiddle.net/gurjitmehta/orzpzf69/

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