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  • Cooperator Framework

    - by csharp-source.net
    Cooperator Framework is a base class library for high performance Object Relational Mapping (ORM), and a code generation tool that aids agile application development for Microsoft .Net Framework 2.0/3.0. The main features are: * Use business entities. * Full typed Model (Data Layer and Entities) * Maintain persistence across the layers by passing specific types( .net 2.0/3.0 generics) * Business objects can bind to controls in Windows Forms and Web Forms taking advantage of data binding of Visual Studio 2005. * Supports any Primary Key defined on tables, with no need to modify it or to create a unique field. * Uses stored procedures for data access. * Supports concurrency. * Generates code both for stored procedures and projects in C# or Visual Basic. * Maintains the model in a repository, which can be modified in any stage of the development cycle, regenerating the model on demand.

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  • Why don't we use dynamic (server-side generated) CSS?

    - by ern0
    As server-side generated HTML is trivial (and it was the only way to make dynamic webpages before AJAX), server-side generated CSS is not. Actually, I've never seen it. There are CSS compilers, but they generate CSS files which can be used as static. Technically, it requires no special libraries, the HTML style tag should reference to the PHP(/ASP/whatever) templater script instead of the static CSS file, and the script should send out CSS content-type header - that's all. Does it have cache problems? I don't think so. The script should send out no-cache etc. headers. Is it problem for designers? No, they should edit the CSS template (as they edit the HTML template). Why we don't use dynamic CSS generators? Or if there's any, please let me know.

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  • A good interpreted language for a small embedded project

    - by Earlz
    I have an mbed which has a small ARM Cortex M3 on it. Basically, my effective resources for the project are ~25Kb of RAM and ~400Kb of Flash. For I/O I'll have a PS/2 keyboard, a VGA framebuffer(with character output), and an SD card for saving/loading programs(up to a couple of Mb maybe) The reason I ask this here is because I'm trying to figure out what programming language to implement on the thing. I'm looking for an interpreted language that's easy for me to implement, and won't break the bank on my resources. I also intend for this to be at least possible to write on th device itself, though the editor can be interpreted(yay bootstrapping) Anyway, I've looked at a few simple languages. Some nice candidates: Forth BASIC Scheme? Has anyone done something like this or know of any languages that can fit this bill or have comments about my three candidates so far?

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  • Code Monster Helps Introduce Kids (and Curious Adults) to the Basics of Programming

    - by Jason Fitzpatrick
    If you’re looking for a fun way to introduce a kid to programming (or sate your own curiosity), Crunchzilla’s Code Monster is a real-time introduction to basic programming concepts. How does Code Monster work? Users are guided through the programming experience (using JavaScript) by a talkative blue monster that asks questions about the code and suggests courses of action. Play long enough and you travel from simple variables to more complex ideas like conditionals, expressions, and more. It’s not a comprehensive programming curriculum (nor does it claim to be) but it’s a great way to introduce people of all ages to programming. Hit up the link below to take it for a spin. Code Monster [via O'Reilly Radar] 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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  • DIY Camera Carrier Turns any Bag into a Camera Bag

    - by Jason Fitzpatrick
    The biggest problem with camera bags is that they look like camera bags and thus become a perfect target for thieves. This DIY camera carrier lets you slip a lens and camera holder into any bag to help conceal and protect your gear. The project comes to us courtesy of Joy, a designer and crafter, and her adventures in making a DIY camera carrier to help protect her camera while carrying it discretely in her purse. You’ll need some basic sewing skills and access to a sewing machine; to follow along check out the link below and adjust the dimensions of her design to fit your bag. Camera Carrier Insert Tutorial [via Apartment Therapy] HTG Explains: Is ReadyBoost Worth Using? HTG Explains: What The Windows Event Viewer Is and How You Can Use It HTG Explains: How Windows Uses The Task Scheduler for System Tasks

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  • Good book/resource recommendation for HTML5 mobile game development?

    - by Greg Bala
    The problem: I am taking an existing, 5 year old, html based MMORTS game and "HTML5-ing" it, "AJAX-ing" it and most importantly, optimizing for mobile devices like iPhone, android etc. For these devices, the application will be packaged as a downloadable app that is a wrapper for a browser which actually shows the game.. The Question Looking for a good book, or books, or in-depth articles that would help me learn: what tools I have in iOS, andriod applications for optimizing an html based game. things like caching of images, etc what kind of connectivity, or interactivity I can expect between the html/javascript pages and the wrapper - can I play sounds in the wrapper by triggering them from javascript? etc tip and tricks to optimize html/html5 & Javascript application to run well on mobile devices ETC :) Any recommendations would be greatly appreciated!!

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  • SQL SERVER 2012 Editions – Highlights of The Cloud-Ready Information Platform

    - by pinaldave
    Microsoft has just announced SQL Server 2012 Editions information on official SQL Server 2012 site. SQL Server 2012 will be available in three main editions: Enterprise Business Intelligence Standard The other editions are Web, Developer and Express. Here is the salient features of each of the edition: Enterprise Advanced high availability with AlwaysOn High performance data warehousing with ColumnStore Maximum virtualization (with Software Assurance) Inclusive of Business Intelligence edition’s capabilities Business Intelligence Rapid data discovery with Power View Corporate and scalable reporting and analytics Data Quality Services and Master Data Services Inclusive of the Standard edition’s capabilities Standard Standard continues to offer basic database, reporting and analytics capabilities There is comparison chart of various other aspect of the above editions. Please refer here. Additionally SQL Server 2012 licensing is also explained here. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Business Intelligence, Pinal Dave, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority News, SQLServer, T SQL, Technology

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  • Reviewing the "Oracle Coherence 3.5" Book

    - by [email protected]
      I received the "Oracle Coherence 3.5" book in ebook format from Packt. I have been going through the ebook and I am really amazed with it. It is definitely a great guide for both experienced users and newbies. It is extremely well structured, and it's easy to read and understand. Additionally, the book contains a lot of useful information, including basic and advanced concepts, best practices, very useful tips and very good examples too.   In summary, if you want to become a Coherence expert, even if you are a Coherence newbie, this book is the way to go!   Further information about the book can be seen at Packt.  

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  • Implementing 2D CSG (for collision shapes)?

    - by bluescrn
    Are there any simple (or well documented) algorithms for basic CSG operations on 2D polygons? I'm looking for a way to 'add' a number of overlapping 2D collision shapes. These may be convex or concave, but will be closed shapes, defined as a set of line segments, with no self-intersections. The use of this would be to construct a clean set of collision edges, for use with a 2D physics engine, from a scene consisting of many arbitrarily placed (and frequently overlapping) objects, each with their own collision shape. To begin with, I only need to 'add' shapes, but the ability to 'subtract', to create holes, may also be useful.

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  • Any good tutorials all this web programming stuff for a GUI person? [closed]

    - by supercheetah
    For some reason, I am having a hard time understanding all this web programming stuff--from AJAX to JSON, etc. I've got plenty of experience programming GUIs. I'm currently working on a project in Python, and I thought that maybe I could just use PyJS (since it's GWT for Python, it uses an API that's very familiar to experienced GUI programmers like myself) to compile it with a Javascript interface on top, but alas, the compiler gave me a spectacular failure. It's obviously not meant to handle much of any Python beyond itself, and some of the core Python library. It would have been nice if it could, but I will admit, it would have been the lazy way to do it. I tried to learn Django, but for some reason, I'm just having a hard time understanding the tutorial on their website, and what it's all doing. Maybe it's not the best framework to learn, perhaps? Anyway, does anyone have a good primer/tutorial explaining all this stuff, especially for Python, and especially for someone coming from a GUI background?

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  • Good and easy way to share files on local machine

    - by jb
    I would like to have a directory that has following properties: Many users can copy files into it These files can be deleted/changed by these users (user A can delete/modify file that was copied into this directory) it cant be done using normal file permissions (because permissions are retained on copy). Here is what I found on the net: brainstorm idea blueprint Some use cases: Sharing music on local machine Simple git repository sharing (just make a bare repository writeable to many people) --- i know that there are solutions like gitosis Allow many developers to modify test instance of php app without giving them root (i guess they would copy files) --- I'm leading a team of nonprofit junior developers and I need to keep that one simple! EDIT AFAIK setting SGID bit is not enugh, it only affects newly created files --- and basic workflow for these use cases ivnolves copying and other operations (which cleave file's gid unchanged)

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  • The Basics of Project Management / Software Development

    - by Sam
    It suddenly struck me today that I have never developed any large application or worked with a team of programmers, and so am missing out a lot - both in terms of technical knowledge and the social-fun part of it. And I would like to rectify that - an idea is to start an open source group by training college students (for no charge) and developing some open source application with them. Please give me some basic advice on the whole process of how to (1) plan and (2) manage projects in a team. What new skill sets would you recommend? (I have read joel on software and 37 Signals, and got many insightful tips from them. But I'd like a little more technical knowledge ...) Background (freelancer, past 4+ years) - Computer engineer graphic / web designer online marketing moved on to programming in PHP, Perl, Python did Oracle DBA OCP training to understand DB's current self-assigned title - web application developer.

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  • Tile-based maps in AS3

    - by Ashley
    I want to make a tile-based platformer in AS3. I want my game to read an external maps file (in xml or json or somethimg similar) to draw a tile-based map. I've seen loads of tutorials for this in AS2 and other languages, and the few I've found in AS3 are either incomplete or filled with extra unnecessary features. I just want to be able to draw a basic map from sprites in Flash. Any links or information to point me in the right direction would be appreciated.

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  • Including Specific Characters with Google Web Fonts

    - by S.K.
    I'm using the Open Sans web font from Google Web Fonts on my website. I only need the basic latin subset, but I do use the Psi (?) character quite often as well and I would like to use the Open Sans version of that character, without having to include the entire greek subset. I looked at this help page which shows how to embed specific characters only using the text parameter, but there's no mention of including specific characters. I tried doing the following to try to combine both font requests into one, but it didn't end up working. <link href='http://fonts.googleapis.com/css?family=Open+Sans:400,400italic,700&subset=latin' rel='stylesheet' type='text/css'> <link href='http://fonts.googleapis.com/css?family=Open+Sans:400,400italic,700&text=%CE%A8' rel='stylesheet' type='text/css'> Is there anyway to accomplish this?

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  • Understanding Backtracking in C++

    - by nikhil
    I have a good basic understanding of the fundamentals of C++, I also have an understanding of how recursion works too. I came across certain problems like the classic eight queens problem and solving a Sudoku with Backtracking. I realize that I'm quite lost when it comes to this, I can't seem to be able to get my mind around the concept of going back in the recursion stack and starting again in order to solve the problem. It seems easy with a pen and paper but when it comes to writing code for this, I'm confused on how to begin attacking these problems. It would be helpful if there were a tutorial aimed at beginners to backtracking or if there were a good book where this was covered. If somebody can shed light on this topic or give me some links to decent references, I'd be really grateful. And yes I do know that it would be easier in functional languages but I'd like to understand the implementation in imperative languages too.

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  • FAQ: Highlight GridView Row on Click and Retain Selected Row on Postback

    - by Vincent Maverick Durano
    A couple of months ago I’ve written a simple demo about “Highlighting GridView Row on MouseOver”. I’ve noticed many members in the forums (http://forums.asp.net) are asking how to highlight row in GridView and retain the selected row across postbacks. So I’ve decided to write this post to demonstrate how to implement it as reference to others who might need it. In this demo I going to use a combination of plain JavaScript and jQuery to do the client-side manipulation. I presumed that you already know how to bind the grid with data because I will not include the codes for populating the GridView here. For binding the gridview you can refer this post: Binding GridView with Data the ADO.Net way or this one: GridView Custom Paging with LINQ. To get started let’s implement the highlighting of GridView row on row click and retain the selected row on postback.  For simplicity I set up the page like this: <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>You have selected Row: (<asp:Label ID="Label1" runat="server" />)</h2> <asp:HiddenField ID="hfCurrentRowIndex" runat="server"></asp:HiddenField> <asp:HiddenField ID="hfParentContainer" runat="server"></asp:HiddenField> <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Trigger Postback" /> <asp:GridView ID="grdCustomer" runat="server" AutoGenerateColumns="false" onrowdatabound="grdCustomer_RowDataBound"> <Columns> <asp:BoundField DataField="Company" HeaderText="Company" /> <asp:BoundField DataField="Name" HeaderText="Name" /> <asp:BoundField DataField="Title" HeaderText="Title" /> <asp:BoundField DataField="Address" HeaderText="Address" /> </Columns> </asp:GridView> </asp:Content>   Note: Since the action is done at the client-side, when we do a postback like (clicking on a button) the page will be re-created and you will lose the highlighted row. This is normal because the the server doesn't know anything about the client/browser not unless if you do something to notify the server that something has changed. To persist the settings we will use some HiddenFields control to store the data so that when it postback we can reference the value from there. Now here’s the JavaScript functions below: <asp:content id="Content1" runat="server" contentplaceholderid="HeadContent"> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js" type="text/javascript"></script> <script type="text/javascript">       var prevRowIndex;       function ChangeRowColor(row, rowIndex) {           var parent = document.getElementById(row);           var currentRowIndex = parseInt(rowIndex) + 1;                 if (prevRowIndex == currentRowIndex) {               return;           }           else if (prevRowIndex != null) {               parent.rows[prevRowIndex].style.backgroundColor = "#FFFFFF";           }                 parent.rows[currentRowIndex].style.backgroundColor = "#FFFFD6";                 prevRowIndex = currentRowIndex;                 $('#<%= Label1.ClientID %>').text(currentRowIndex);                 $('#<%= hfParentContainer.ClientID %>').val(row);           $('#<%= hfCurrentRowIndex.ClientID %>').val(rowIndex);       }             $(function () {           RetainSelectedRow();       });             function RetainSelectedRow() {           var parent = $('#<%= hfParentContainer.ClientID %>').val();           var currentIndex = $('#<%= hfCurrentRowIndex.ClientID %>').val();           if (parent != null) {               ChangeRowColor(parent, currentIndex);           }       }          </script> </asp:content>   The ChangeRowColor() is the function that sets the background color of the selected row. It is also where we set the previous row and rowIndex values in HiddenFields.  The $(function(){}); is a short-hand for the jQuery document.ready event. This event will be fired once the page is posted back to the server that’s why we call the function RetainSelectedRow(). The RetainSelectedRow() function is where we referenced the current selected values stored from the HiddenFields and pass these values to the ChangeRowColor() function to retain the highlighted row. Finally, here’s the code behind part: protected void grdCustomer_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { e.Row.Attributes.Add("onclick", string.Format("ChangeRowColor('{0}','{1}');", e.Row.ClientID, e.Row.RowIndex)); } } The code above is responsible for attaching the javascript onclick event for each row and call the ChangeRowColor() function and passing the e.Row.ClientID and e.Row.RowIndex to the function. Here’s the sample output below:   That’s it! I hope someone find this post useful! Technorati Tags: jQuery,GridView,JavaScript,TipTricks

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  • Defining Your Online Segmentation and Targeting Strategy

    - by Christie Flanagan
    Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} A lot of times, companies will put online segmentation and targeting on the back burner because they don’t know where to start. Often, I’ve heard web managers say that their segments aren’t well understood yet, so they can’t really deliver personalized online experiences that are meaningful. This lack of complete understanding means that they don't really bother to try. But, I don’t think you necessarily need to have an elaborate segmentation and targeting strategy already in place to start delivering a more relevant online customer experience. Sometimes it helps to think of how segmentation and targeting might solve some of the challenges your sites visitors are currently experiencing on your web presence, rather than doing nothing and waiting until a fully baked segmentation strategy lands in your inbox.  For example, perhaps you have a broad and varied service offering that makes it difficult for site visitors to easily find the solutions that are most relevant for them.  How can segmentation and targeting help solve this problem?  Or maybe it’s like the airline I described in Monday’s post where the special deals featured on the home page are only relevant to site visitors from a couple of cities.  Couldn’t segmentation and targeting help them to highlight offers on their home page that are relevant to a larger share of their site visitors? Your early segmentation and targeting efforts do not need to be complicated.  There are simple ways to start delivering a more relevant online customer experience, even if you’re dealing with anonymous site visitors.  These include targeting content to site visitors based on: Referral: Deliver targeted content to your site visitors that is based on where they came from or the search term they used to find your site Behavior:  Deliver content to your site visitors that is related or similar to content they’ve clicked on already Location:  Deliver content your site visitors that is most relevant for their geographic location (this would solve that pesky airline home page problem described above) So as you can see, there really are some very simple ways in which you can start improving your online customer experience using very basic segmentation and targeting methods.  One thing to keep in mind as you start to define you segmentation and targeting strategy is that there are many different types of attributes or combinations of attributes upon which you can base your segmentation and targeting strategy.  In addition to referral, behavior and location, other attributes that you should consider are: Profile Information:  What profile information do you know about this customer already?  Perhaps they provided some information on their interests and preferences when they first registered with your site. Time:  What time is it and how does that impact what my site visitors are looking for or trying to do? Demographics: What are my site visitors’ ages, incomes or ethnicities? Which attributes you select to include in your segmentation strategy will depend on your unique business needs and objectives.  Attributes such as behavior or referral may not be the most important targeting criteria depending on your situation. For example, if you’re a newspaper you might know that certain visitors are sports fans based on their profile information.  You can create a segment for sports fans and target sports related content to that segment of your readership online.  Or perhaps, a reader is browsing stories that are related to politics; you can use that visitor’s behavior to assign him or her to a segment for those interested in politics. From there you can recommend more stories to that visitor based on their interest in politics. For an airline, the visitor’s location may be a more important attribute. By detecting the visitor’s location, you can assign them to an appropriate segment and then target special flights and offers to them based on their likely departure airport. As you can see, there are many practical ways that you can start improving the experience your customers receive on your web presence using fairly basic segmentation and targeting techniques. If you want to learn more about segmentation and targeting using Oracle’s web experience management solution, check out this helpful video that demonstrates these powerful capabilities in Oracle WebCenter Sites. ***** On Demand Webcast Featuring Brian Solis of Altimeter Group Trends such as the mobile web, social media, gamification and real-time are changing customer behavior and expectations. In this new environment, many businesses will struggle. Some will fall by the wayside, while others learn to adapt and thrive. Watch this on demand webcast with Altimeter Group digital analyst and author, Brian Solis, and discover what your organization needs to know about how to compete in the new era of Digital Darwinism. View now.

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  • Smooth animation in Cocos2d for iOS

    - by MrDatabase
    I move a simple CCSprite around the screen of an iOS device using this code: [self schedule:@selector(update:) interval:0.0167]; - (void) update:(ccTime) delta { CGPoint currPos = self.position; currPos.x += xVelocity; currPos.y += yVelocity; self.position = currPos; } This works however the animation is not smooth. How can I improve the smoothness of my animation? My scene is exceedingly simple (just has one full-screen CCSprite with a background image and a relatively small CCSprite that moves slowly). I've logged the ccTime delta and it's not consistent (it's almost always greater than my specified interval of 0.0167... sometimes up to a factor of 4x). I've considered tailoring the motion in the update method to the delta time (larger delta = larger movement etc). However given the simplicity of my scene it's seems there's a better way (and something basic that I'm probably missing).

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  • Can't connect to Wireless Access Point after installing proprietary drivers

    - by user6554
    I had Windows Vista Basic installed on my computer and I replaced it with Ubuntu 10.10. I then preceded to do the following: I downloaded the wireless driver from 'additional drivers' I enabled my wireless card And now it won't connect to my router but my game systems will. Then I downloaded WiFi-Radar  which did not seem to fix the problem. I still cannot connect to the Internet. I have done an exhaustive search of the Internet and turned up nothing.

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  • Online training modules / programs for best software engineering practices?

    - by Steve
    We're taking over a team in a foreign country and the programming standards there aren't up to par with US standards. Folks there lack the formal training and basic understanding of computing concepts of databases, how computers work, what good software engineering practices are. Short of sending these ppl to college again, are there good online courses available that we can enroll them into so that they can upgrade their skills? I am specifically looking for online training courses, but recommendations for books are also welcome. This is language-agnostic.

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  • What programming languages have you taught your children?

    - by Dubmun
    I'm a C# developer by trade but have had exposure to many languages (including Java, C++, and multiple scripting languages) over the course of my education and career. Since I code in the MS world for work I am most familiar with their stack and so I was excited when Small Basic was announced. I immediately started teaching my oldest to program in it but felt that something was missing from the experience. Being able to look up every command with the IDE's intellisense seemed to take something from the experience. Sure, it was easy to grasp but I found myself thinking that a little more challenge might be in order. I'm looking for something better and I would like to hear your experiences with teaching your children to program in whatever language you have chosen to do so in. What did you like and dislike? How fast did they pick it up? Were they challenged? Frustrated? Thank you very much!

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  • Sequence for authentication on a decoupled client?

    - by A T
    Using a sequence diagram and example code could you explain to me how authentication works when the client is completely separated from the server? I.e.: you haven't generated any of the client using a server-side template engine, rather you are communicating using REST (SOAP xor HTTP) xor RPC (XML xor JSON) with javascript on the client-side. Specifically I would like to know the sequence of: Authenticating using basic auth (user+pass) with "my" server Authenticating using OAuth2, e.g.: with Facebook, with facebook's server then whatever extra steps are needed for "my" server And how it could be implemented. (feel free to use psuedo-code [like below] or [preferably] prototyped simply using BackboneJS, AngularJS, EmberJS, BatmanJS, AgilityJS, SammyJS xor ActiveJS. if cookie.status in [Expired, Tampered, Wrong IP, Invalid, Not Found]: try auth(user,pass): if user is in my db: try authenticate(user,pass) if successful: login user # give session-cookie here? else: present user with "auth failed" msg else if user not in db: redirect to "edit-profile" page PS: I have written an example (editable) auth sequence diagram; based on facebooks' documentation.

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  • HTG Explains: Does Your Android Phone Need an Antivirus?

    - by Chris Hoffman
    The media is full of reports saying Android malware is exploding and that Android users are at risk. Does this mean you should install an antivirus app on your Android phone or tablet? While there may be a lot of Android malware in the wild, a look at Android’s protections and studies from antivirus companies reveals that you’re probably safe if you follow some basic precautions. How To Use USB Drives With the Nexus 7 and Other Android Devices Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder? Why Your Android Phone Isn’t Getting Operating System Updates and What You Can Do About It

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  • Not getting GUI mode on ubuntu 12.04 desktop edition after installation on vmware workstation 7

    - by Salil Naik
    I installed Ubuntu 12.04 desktop edition on my PC using VMWare workstation 7. I assigned 1GB RAM and 20 GB Hard disk to Ubuntu. While starting Ubuntu virtual machine, It is not starting up with GUI mode. In is prompting me my Login ID in textual mode always. After waiting for long time as well the GUI mode is not appearing. I tried running sudo apt-get install updates sudo apt-get install xinit sudo apt-get install ubuntu-desktop Honestly, i don't know the meaning of all these.I am very new to ubuntu.Please help me here what to do? Below is my Laptop configuration OS: Genuine Windows 7 Home Basic(64 bit) RAM: 3 GB Processor: Intel core i3 Regards Salil

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  • Introducing jLight &ndash; Talking to the DOM using Silverlight and jQuery.

    - by Timmy Kokke
    Introduction With the recent news about Silverlight on the Windows Phone and all the great Out-Of-Browser features in the upcoming Silverlight 4 you almost forget Silverlight is a browser plugin. It most often runs in a web browser and often as a control. In many cases you need to communicate with the browser to get information about textboxes, events or details about the browser itself. To do this you can use JavaScript from Silverlight. Although Silverlight works the same on every browser, JavaScript does not and it won’t be long before problems arise. To overcome differences in browser I like to use jQuery. The only downside of doing this is that there’s a lot more code needed that you would normally use when you write jQuery in JavaScript. Lately, I had to catch changes is the browser scrollbar and act to the new position. I also had to move the scrollbar when the user dragged around in the Silverlight application. With jQuery it was peanuts to get and set the right attributes, but I found that I had to write a lot of code on Silverlight side.  With a few refactoring I had a separated out the plumbing into a new class and could call only a few methods on that to get the same thing done. The idea for jLight was born. jLight vs. jQuery The main purpose of jLight is to take the ease of use of jQuery and bring it into Silverlight for handling DOM interaction. For example, to change the text color of a DIV to red, in jQuery you would write: jQuery("div").css("color","red"); In jLight the same thing looks like so: jQuery.Select("div").Css("color","red");   Another example. To change the offset in of the last SPAN you could write this in jQuery : jQuery("span:last").offset({left : 10, top : 100});   In jLight this would do the same: jQuery.Select("span:last").Offset(new {left = 10, top = 100 });   Callbacks Nothing too special so far. To get the same thing done using the “normal” HtmlPage.Window.Eval, it wouldn’t require too much effort. But to wire up a handler for events from the browser it’s a whole different story. Normally you need to register ScriptMembers, ScriptableTypes or write some code in JavaScript. jLight takes care of the plumbing and provide you with an simple interface in the same way jQuery would. If you would like to handle the scroll event of the BODY of your html page, you’ll have to bind the event using jQuery and have a function call back to a registered function in Silverlight. In the example below I assume there’s a method “SomeMethod” and it is registered as a ScriptableObject as “RegisteredFromSilverlight” from Silverlight.   jQuery("body:first").scroll(function() { var sl = document.getElementbyId("SilverlightControl"); sl.content.RegisteredFromSilverlight.SomeMethod($(this)); });       Using jLight  in Silverlight the code would be even simpler. The registration of RegisteredFromSilverlight  as ScriptableObject can be omitted.  Besides that, you don’t have to write any JavaScript or evaluate strings with JavaScript.   jQuery.Select("body:first").scroll(SomeMethod);   Lambdas Using a lambda in Silverlight can make it even simpler.  Each is the jQuery equivalent of foreach in C#. It calls a function for every element found by jQuery. In this example all INPUT elements of the text type are selected. The FromObject method is used to create a jQueryObject from an object containing a ScriptObject. The Val method from jQuery is used to get the value of the INPUT elements.   jQuery.Select("input:text").Each((element, index) => { textBox1.Text += jQueryObject.FromObject(element).Val(); return null; });   Ajax One thing jQuery is often used for is making Ajax calls. Making calls to services to external services can be done from Silverlight, but as easy as using jQuery. As an example I would like to show how jLight does this. Below is the entire code behind. It searches my name on twitter and shows the result. This example can be found in the source of the project. The GetJson method passes a Silverlight JsonValue to a callback. This callback instantiates Twit objects and adds them to a ListBox called TwitList.   public partial class DemoPage2 : UserControl { public DemoPage2() { InitializeComponent(); jQuery.Load(); }   private void CallButton_Click(object sender, RoutedEventArgs e) { jQuery.GetJson("http://search.twitter.com/search.json?lang=en&q=sorskoot", Done); }   private void Done(JsonValue arg) { var tweets = new List<Twit>(); foreach (JsonObject result in arg["results"]) { tweets.Add(new Twit() { Text = (string)result["text"], Image = (string)result["profile_image_url"], User = (string)result["from_user"] } ); } TwitList.ItemsSource = tweets; } }   public class Twit { public string User { get; set; } public string Image { get; set; } public string Text { get; set; } }   Conclusion Although jLight is still in development it can be used already.There isn’t much documentation yet, but if you know jQuery jLight isn’t very hard to use.  If you would like to try it, please let me know what you think and report any problems you run in to. jLight can be found at:   http://jlight.codeplex.com

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