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• Catching "NullPointerExceptions" in JavaScript

  - by Lenni

  I'm writing quite a bit of code in Prototype.js which returns null if a DOM-id wasn't found. $("someId").show(); If someId doesn't exist, a method will be called on null, which halts the entire program, in effect disabling all JS effects after the error. I could just check for null before executing such a statement, but this is getting tiring. I would like to catch an exception but I'm not sure which one its is. MDC lists the following ECMA Script error types: * Error * EvalError * RangeError * ReferenceError * SyntaxError * TypeError * URIError * DOMException * EventException * RangeException Also, do browsers have a unified way of dealing with a method call on null?

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• How does the email header field 'thread-index' work?

  - by Tim

  I was wondering if anyone knew how the thread-index field in email headers work? Here's a simple chain of emails thread indexes that I messaged myself with. Email 1 Thread-Index: AcqvbpKt7QRrdlwaRBKmERImIT9IDg== Email 2 Thread-Index: AcqvbpjOf+21hsPgR4qZeVu9O988Eg== Email 3 Thread-Index: Acqvbp3C811djHLbQ9eTGDmyBL925w== Email 4 Thread-Index: AcqvbqMuifoc5OztR7ei1BLNqFSVvw== Email 5 Thread-Index: AcqvbqfdWWuz4UwLS7arQJX7/XeUvg== I can't seem to say with certainty how I can link these emails together. Normally, I would use the in-reply-to field or references field, but I recently found that Blackberrys do NOT include these fields. The only include Thread-Index field.

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• Animated record deletion with jquery like mootools example

  - by twitter

  I was reading around and saw this example from David Walsh about how to animate record deletion with mootools. Does the exact same effect exist in jquery? This is his mootools code. window.addEvent('domready',function() { $$('a.delete').each(function(el) { el.addEvent('click',function(e) { e.stop(); var parent = el.getParent('div'); var request = new Request({ url: 'mootools-record-delete.php', link: 'chain', method: 'get', data: { 'delete': parent.get('id').replace('record-',''), ajax: 1 }, onRequest: function() { new Fx.Tween(parent,{ duration:300 }).start('background-color', '#fb6c6c'); }, onSuccess: function() { new Fx.Slide(parent,{ duration:300, onComplete: function() { parent.dispose(); } }).slideOut(); } }).send(); }); }); });

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• C++ method chaining including class constructor

  - by jena

  Hello, I'm trying to implement method chaining in C++, which turns out to be quite easy if the constructor call of a class is a separate statement, e.g: Foo foo; foo.bar().baz(); But as soon as the constructor call becomes part of the method chain, the compiler complains about expecting ";" in place of "." immediately after the constructor call: Foo foo().bar().baz(); I'm wondering now if this is actually possible in C++. Here is my test class: class Foo { public: Foo() { } Foo& bar() { return *this; } Foo& baz() { return *this; } }; I also found an example for "fluent interfaces" in C++ (http://en.wikipedia.org/wiki/Fluent_interface#C.2B.2B) which seems to be exactly what I'm searching for. However, I get the same compiler error for that code. Thanks in advance for any hint. Best, Jean

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• Build Pipelining and Continuous Integration with Maven and Hudson

  - by Brandon

  Currently the my team is considering splitting our single CI build process into a more streamlined multi-stage process to speed up basic build feedback and isolate different ci concerns. The idea we had was to have each stage exist in Hudson as a different build with the correct maven goal or maven plugin execution, then chain them together using the post-build hooks of Hudson. However to my knowledge, Maven as a build tool mandates that any lifecycle phase which is performed automatically builds every preceding lifecycle phase. This presents a number of problems the most significant of which is that maven is recreating the build resources with each distinct call and not using those of the previous stage. This not only breaks the consistency of the build lifecycle but has much more unnecessary processing overhead. Is there a way to accomplish pipelining with CI using Maven? Assuming there is, is there a way to let Hudson know to use those resources built from the previous stage in the next one?

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• javascript inherance? with Private vars and methods too

  - by Totty

  Hy i need to inherent a class from another. Parent has private var "_data" and private method "_test" and public method "add" Now the child have a public method "add", that uses the private method from the parent "_test" and the private var "_data". How do i do this? var Parent = function(){ var _data = {}; var _test = function(){alert('test')}; this.add = function(){alert('add from parent')} } var Child = function(){ this.add = function(){// here uses the _data and _test from the Parent class alert('add from child') } } // something to inherent Child from Parent // instance Child and use the add method And i think im miss the prototype concept (http://stackoverflow.com/questions/892467/javascript-inheritance)

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• Drag and drop between HTML 5 and Silverlight 4

  - by Tej

  Hi - Is it possible to drag an HTML 5 object, e.g. an , into a Silverlight 4 control and accept it? We've attempted to build a simple prototype using an HTML 5 example and a trivial Silverlight control but the cursor changes to the no-entry sign whenever we hover over the Silverlight control. We do, however, get drag entry events firing in Silverlight. Our control happily accepts files dragged from the desktop as expected. We think we've got the HTML 5 drag events set up correctly, and I can possibly get our test published somewhere in case that will help. We've successfully implemented dragging inside a Silverlight control but we now need to integrate with non-Silverlight page components. Is this actually possible to set up or are we just doing something wrong? Thanks for any advice!

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• Grails remoteLink handling error codes

  - by soybie

  I'm on grails 1.3.6 and I see the following behavior. <g:javascript library="prototype" /> ... <g:remoteLink action="punch" id="${personInstance.id}" update="damage_${personInstance.id}" on401="alert('foo!');"> generates: <a on401="alert('foo!');" onclick="new Ajax.Updater('damage_5','/blah/person/punch/5',{asynchronous:true,evalScripts:true});return false;" href="/blah/person/punch/5"></a> "on401" isn't a supported event attribute for an anchor tag, so is this a bug in grails?

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• C# StringBuilder question

  - by andrew

  in a C# file i have a class Archiver { [DllImport("Archiver.dll")] public static extern void archive(string data, StringBuilder response); } string data is an input, and StringBuilder response is where the function writes something the archive function prototype (written in C) looks like this: void archive(char * dataChr, char * outChr); and it receives a string in dataChr, and then does a strcpy(outChr,"some big text"); from C# i call it something like this: string message = "some text here"; StringBuilder response = new StringBuilder(10000); Archiver.archive(message,response); this works, but the problem, as you might see is that i give a value to the StringBuilder size, but the archive function might give back a (way) larger text than the size i've given to my StringBuilder. any way to fix this?

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• building objects from xml file at runtime and intializing, in one pass?

  - by KaluSingh Gabbar

  I have to parse the XML file and build objects representation based on that, now once I get all these data I create entries in various database for these data objects. I have to do second pass over that for value as in the first pass all I could do is build the assets in various databases. and in second pass I get the values for all the data and put it in the database. I have a feeling that this can be done in a single pass but I just want to see what are your opinions. As I am just a student who started with professional work, experienced ppl please help. Can someone who have ideas or done similar work, please provide some light on the topic so that I can think over the possibility of the work and get the prototype going based on your suggestion. Thanks a lot for your precious time, I honestly appreciate it.

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• Wrong root on image_tag, include_tags, etc

  - by Newy

  On my dev setup, generated routes are mysteriously pointing to my public www server. <%= javascript_include_tag :defaults % [yields] <script src="http://www.mysite.com//javascripts/prototype.js?1265304231" type="text/javascript"></script> <script src="http://www.mysite.com//javascripts/effects.js?1265304231" type="text/javascript"></script> <script src="http://www.mysite.com//javascripts/dragdrop.js?1265304231" type="text/javascript"></script> <script src="http://www.mysite.com//javascripts/controls.js?1273647885" type="text/javascript"></script> <script src="http://mysite.opzi.com//javascripts/application.js?1273611341" type="text/javascript"></script> Where is this option set? Can't find it for the life of me.

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• sql query where parameters null not null

  - by Laziale

  I am trying to do a sql query and to build the where condition dynamically depending if the parameters are null or no. I have something like this: SELECT tblOrder.ProdOrder, tblOrder.Customer FROM tblOrder CASE WHEN @OrderId IS NOT NULL THEN WHERE tblOrder.OrderId = @OrderId ELSE END CASE WHEN @OrderCustomer IS NOT NULL THEN AND tblOrder.OrderCustomer = @OrderCustomer ELSE END END This doesn't work, but this is just a small prototype how to assemble the query, so if the orderid is not null include in the where clause, or if the ordercustomer is not null include in the where clause. But I see problem here, for example if the ordercustomer is not null but the orderid is null, there will be error because the where keyword is not included. Any advice how I can tackle this problem. Thanks in advance, Laziale

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• Geocoding service for a startup?

  - by Sologoub

  I'm working on an idea for a service that uses geocoded data (lat/lng) form a US address. Google maps API v3 has been awesome, until I read the terms of service and acceptable uses a little closer. The problem is that the terms seem to prohibit use of the maps API for any commercial use where the site is not freely accessibly to the public, such as a subscription based service. The alternative offered is Google Maps API Premier, but at $10,000 per year minimum, it's just not possible at this time. Same goes for services offered by Yahoo! and MS - initial fees are small for enterprises, but for a very early stage startup (not even a finished prototype yet!) it's just not doable. Geocoding process needs to be real-time and volume would be very small - user would enter address at setup time and only update it if needed. Any help is greatly appreciated!

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• How can I find out the original username a process was started with?

  - by szabgab

  There is a perl script that needs to run as root but the we must make sure the user who runs the script did not log-in originally as user foo as it will be removed during the script. So how can I find out if the user, who might have su-ed several times since she logged in has not impersonated 'foo' at any time in that chain? I found an interesting perl script that was calling the following two shell scripts, but I think that would only work on Solaris. my $shell_paren = `ps -ef | grep -v grep | awk \'{print \$2\" \"\$3}\' | egrep \"^@_\" | awk \'{print \$2}'`; my $parent_owner = `ps -ef | grep -v grep | awk \'{print \$1\" \"\$2}\' | grep @_ | awk \'{print \$1}\'`; This needs to work on both Linux and Solaris and I'd rather eliminate the repeated calls to he the shell and keep the whole thing in Perl.

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• Using jQuery for Effects

  - by OneNerd

  Ok - have been tasked with possibly an impossible (or at least a potentially nightmarish) scenario. Need to come as close as possible to reproducing PowerPoint-like effects via HTML/JavaScript (the spec is large and ugly, so I will spare you the details). Ultimately, I am looking for a solid launching point. I have used both Prototype/Scriptaculous as well as jQuery in many projects, and based on what I am seeing, it appears jQuery has the more plug-in available, so am leaning towards using jQuery. Can anyone point me to some plug-ins, articles, or anything else that would help me in accelerating the research on this so I can define to my client what can and cannot be done. Any other suggestions from you jQuery gurus are welcome of course. Thanks -

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• What are the common patterns in web programming?

  - by lankerisms

  I have been trying to write my first big web app (more than one cgi file) and as I kept moving forward with the rough prototype, paralelly trying to predict more tasks, this is the todo that got accumulated (In no particular order). * Validations and input sanitizations * Object versioning (to avoid edit conflicts. I dont want hard locks) * Exception handling * memcache * xss and injection protections * javascript * html * ACLs * phonetics in search, match and find duplicates (for form validation) * Ajaxify!!! (I have snipped off the project specific items.) I know that each todo will be quite tied up to its project and technologies used. What I am wondering though, is if there is a pattern in your todo items as well as the sequence in which you experienced guys have come across them.

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• Handling JSON and HTML templates in jQuery

  - by Toby Hede

  I have an ajax-enabled site that presents a lot of dynamic content by interpolating JSON values with HTML. This all works fine. BUT it means I have significant amounts of HTML all through my JavaScript. For example: var template = "<div>Foo: {bar}</div><div>Blah: {vtha}</div>"; template.interpolate({bar:"bar",blah:"vtha"}); I have cut this down a fair bit - some of my dynamic elements have quite a lot of HTML and a lot going on. I am using jQuery and I am building on Rails, so if there is something smart in either framework, that would be great. For reference, the String interpolation function used above is: String.prototype.interpolate = function (o) { return this.replace(/{([^{}]*)}/g, function (a, b) { var r = o[b]; return typeof r === 'string' || typeof r === 'number' ? r : a; } ); };

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• How easy would it be to refactor a small JSP/Servlet/JDBC project to SpringMVC/Hibernate

  - by John

  With reference to this post, I am considering starting a new web-based Java project. Since I don't know Spring/Hibernate I was concerned if it's a bad plan to start learning them while creating a new project, especially since it will slow down the early development. One idea I had was to write a prototype using tech I do know, namely JSP/Servlets/JDBC, since I can get this running much quicker with my current knowledge. I could then throw the whole thing away and start over with Spring, etc, but I'd like to consider how easy it would be to refactor a smallish project from JSP/Servlets/JDB to SpringMVC/Hibernate? My DB could of course be re-used but what about other code... would I expect to save most of it plugged into an MVC framework, or is the paradigm shift big enough this would cause more trouble than it avoids? Please use the other question for more general advice on choosing technologies

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• How do I output the preorder traversal of a tree given the inorder and postorder tranversal?

  - by user342580

  Given the code for outputing the postorder traversal of a tree when I have the preorder and the inorder traversal in an interger array. How do I similarily get the preorder with the inorder and postorder array given? void postorder( int preorder[], int prestart, int inorder[], int inostart, int length) { if(length==0) return; //terminating condition int i; for(i=inostart; i<inostart+length; i++) if(preorder[prestart]==inorder[i])//break when found root in inorder array break; postorder(preorder, prestart+1, inorder, inostart, i-inostart); postorder(preorder, prestart+i-inostart+1, inorder, i+1, length-i+inostart-1); cout<<preorder[prestart]<<" "; } Here is the prototype for preorder() void preorder( int inorderorder[], int inostart, int postorder[], int poststart, int length)

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• Function Composition in C++

  - by Channel72

  There are a lot of impressive Boost libraries such as Boost.Lambda or Boost.Phoenix which go a long way towards making C++ into a truly functional language. But is there a straightforward way to create a composite function from any 2 or more arbitrary functions or functors? If I have: int f(int x) and int g(int x), I want to do something like f . g which would statically generate a new function object equivalent to f(g(x)). This seems to be possible through various techniques, such as those discussed here. Certainly, you can chain calls to boost::lambda::bind to create a composite functor. But is there anything in Boost which easily allows you to take any 2 or more functions or function objects and combine them to create a single composite functor, similar to how you would do it in a language like Haskell?

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• displaying labels in marathi language.

  - by vaishali

  i am tring to display lable of form in marathi language for that am creating marathi.js this my mararhi.js if(Ext.app.formPanel) { Ext.apply(Ext.app.formPanel.prototype, { selectUser:'???' } ); } and my other js file contain this var Ext.app.formPanel = Ext.extend(Ext.form.FormPanel,{ selectUser:'Select User', initComponent : function(config) { Ext.apply(this, { title : 'User Rights', bodyStyle : 'padding: 10px; background-color: #DFE8F6', labelWidth : 100, width : 755, id : 'formUserRights', renderTo:'adminpanel', items : [ id: 'User', fieldLabel:this.selectUser, width:200 ] //items }//Ext.apply );//Ext.apply Ext.app.formPanel.superclass.initComponent.apply(this, arguments); }//init component }); //yuyu ...... .... but it can not work it gives error ;missing before var Ext.app.formPanel = Ext.extend..... but when i checked all carefully every thing is correctly nested.

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• JQuery Two colour slider control automatic move

  - by Geetha

  Hi All, I creating a slider control with two colours for media player streaming. Working: i can drag/ move the slider. Needs: I want to move the slider automatically.(1. Once the control is ready and 2. After changing the position of the slider, from that position it has to move automatically) Code: var slider1 = new Control.Slider('handle1', 'track1', { animate: true, range: $R(0, 10), max: 10, min: 0, sliderValue: 5, startSpan: 'span1', onChange: function(v) { handleSliderChange(v); } }); Plugins: <script src="js/prototype.js" type="text/javascript"></script> <script src="js/slider.js" type="text/javascript"></script> Geetha.

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• Missing something with Reader monad - passing the damn thing around everywhere

  - by Richard Huxton

  Learning Haskell, managing syntax, have a rough grasp of what monads etc are about but I'm clearly missing something. In main I can read my config file, and supply it as runReader (somefunc) myEnv just fine. But somefunc doesn't need access to the myEnv the reader supplies, nor do the next couple in the chain. The function that needs something from myEnv is a tiny leaf function. So - how do I get access to the environment in a function without tagging all the intervening functions as (Reader Env)? That can't be right because otherwise you'd just pass myEnv around in the first place. And passing unused parameters through multiple levels of functions is just ugly (isn't it?). There are plenty of examples I can find on the net but they all seem to have only one level between runReader and accessing the environment.

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• Efficient multiple services exposed over c# .NET remoting using more channels or end points?

  - by wb

  I am using remoting over TCP for a prototype distributed server application where I want to have varying multiple services exposed from each remoting server process. In some cases I want the services running from the same process but I don't want whatever is using the service to care about that. I am wondering is it more efficient to have multiple services in the same process going over the same remoting channel distinguished by endpoint URI/URL or should I be creating new channels on different ports for each service in the same process? Using up ports isn't so much of a problem as the number of services will be low and the network and machine configuration is completely controlled. Also its not clear to me if remoting sends the URI string for every single message or just at connection time, and whether if the remoting framework is intelligent enough to reduce work if calls are made on the same machine and even the same process? Thanks in advance.

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• What's the easiest way for a Java Swing client to consumer a webservice?

  - by Stephane Grenier

  I have a Java Swing application client that I want to use to consume certain webservices, but I want to make it as painless as possible to code (because really all I want is the info). I do understand that whatever solution is used will need to stub the POJO's too. If you'd like to give a demo, that would be great, or if you can point to a tutorial that would also be really appreciated. I did look at Axis, including the more recent Axis2, but it's a bit more complex than I was hoping (aka. I have to learn something). At least just for some quick prototype testing and not real development, more for the sake of just saying I can, is there something or a tutorial out there?

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