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• Confused about ASP.NET Ajax, jQuery and JavaScript

  - by Mr.Y

  Yesterday, I read couple of chapters on ASP.NET Ajax and jQuery from my ASP.NET 4 book and I found those frameworks pretty interesting and decide to learn more about them. Today, I borrowed some books from library on Ajax and JavaScript. It seems ASP.NET Ajax is different from Ajax and jQuery seems like the "new" JavaScript. Does it mean that I can skip JavaScript and learn jQuery directly? On the other hand, the non-ASP.NET Ajax book I borrowed seems to apply to the client side web programming only and looks quite different from what I learned from ASP.NET Ajax. If I'm an ASP.NET developer, I guess I should stick with ASP.NET Ajax instead of client side Ajax right? What about PHP? Is there a "PHP Ajax" similar to ASP.NET Ajax? It's not that I'm lazy to learn other tools, but I just want to focus on the right ones.

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• What are the best practices for rapid prototyping using exclusively HTML/CSS/JS

  - by charlax

  I'm developing a prototype of a web application. I want to only use HTML, CSS and Javascript. I prefer to use my text editor and not having to learn (or pay, for that matter) a new tool like Axure. What would be, to your mind, the best practices? To me there are many qualities for a good prototype: Quickly developed Easy to improve Fair fidelity as regards UX (this disqualifies tools like Omnigraffle or PowerPoint that are more dedicated to wireframing) I trying to learn as quickly as possible, but I would like to know, based on your experience, on how you managed to be both quick and agile. Reference: http://www.boxesandarrows.com/view/prototyping-with

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• Direction of the bullet - how to have something else than left, right, top, bottom

  - by Florian Margaine

  I'm making a simple shooter game using canvas and javascript. The current code can be seen here. To know which way I want the bullet to be shot, I simply have a direction property that can have 4 values (left, right, bottom, top), and I can then calculate the next position of the bullet easily. However, I'd like to move the bullet to the mouse position, but I don't really see how to do this. How do I calculate the next position? I'm guessing there is some formula to calculate the line between two positions (the player's and the mouse's), but I don't have much idea yet. So there is no obstacle, but I don't see how to calculate this, and be able have the next position of the bullet at each frame.

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• HTML5 mobile game development vs. native game apps

  - by Vic Szpilman

  What is the current state of game engines, frameworks, libraries and conversions related to the HTML5 set of technologies (including CSS3 and JavaScript libraries such as RaphaelJS, Impact, gameQuery); and how does the best of that compare with developing a native app (especially for iOS and Android)? Especially in terms of performance, visuals and getting that "native feel". Thoughts on solutions such as Appcelerator and Corona SDK are also appreciated. In regards to Unity3D, is it possible to develop in it and still have the game be playable on a browser (such as current releases of Chrome or Firefox, at least) without any dependencies or having the user install anything (no unity web player). What I'm looking for is how to develop in web standards as to reach the maximum number of platforms (including outside mobile) while still retaining a native experience for mobile without having to implement the game anew for iOS and Android.

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• Create dynamic buffer SharpDX

  - by fedab

  I want to set a buffer that is updated every frame but can't figure it out, what i have to do. The only working thing i have is this: mdexcription = new BufferDescription(Matrix.SizeInBytes * Matrices.Length, ResourceUsage.Dynamic, BindFlags.VertexBuffer, CpuAccessFlags.Write, ResourceOptionFlags.None, 0); instanceBuffer = SharpDX.Direct3D11.Buffer.Create(Device, Matrices, mdexcription); vBB = new VertexBufferBinding(instanceBuffer, Matrix.SizeInBytes, 0); DeviceContext.InputAssembler.SetVertexBuffers(1, vBB); Draw: //Change Matrices (Matrix[]) every frame... instanceBuffer.Dispose(); instanceBuffer = SharpDX.Direct3D11.Buffer.Create(Device, Matrices, mdexcription); vBB = new VertexBufferBinding(instanceBuffer, Matrix.SizeInBytes, 0); DeviceContext.InputAssembler.SetVertexBuffers(1, vBB); I guess Dispose() and creating a new buffer is slow and can be done much faster. I've read about DataStream but i do not know, how to set this up properly. What steps do i have to do to set up a DataStream to achieve fast every-frame update?

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• WPF more dynamic views and DataAnnotations

  - by Ingó Vals

  Comparing WPF and Asp.Net Razor/HtmlHelper I find WPF/Xaml to be somewhat lacking in creating views. With HtmlHelpers you could define in one place how you wan't to represent specific type of data and include elements set from the DataAnnotations of the property. In WPF you can also define DataTemplates for data but it seems much more limited then EditorTemplates. It doesn't use information from DataAnnotations. Also the layout of elements can be bothersome. I hate having to constantly add RowDefinitions and update the Grid.Row attribute of lot of elements when I add a new property somewhere in line. I understand that GUI programming can be a lot of grunt work like this but as Asp.Net MVC has shown there are ways around that. What solutions are out there to make view creation in WPF a little bit cleaner, maintainable and more dynamic?

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• Matrix rotation of a rectangle to "face" a given point in 2d

  - by justin.m.chase

  Suppose you have a rectangle centered at point (0, 0) and now I want to rotate it such that it is facing the point (100, 100), how would I do this purely with matrix math? To give some more specifics I am using javascript and canvas and I may have something like this: var position = {x : 0, y: 0 }; var destination = { x : 100, y: 100 }; var transform = Matrix.identity(); this.update = function(state) { // update transform to rotate to face destination }; this.draw = function(ctx) { ctx.save(); ctx.transform(transform); // a helper that just calls setTransform() ctx.beginPath(); ctx.rect(-5, -5, 10, 10); ctx.fillStyle = 'Blue'; ctx.fill(); ctx.lineWidth = 2; ctx.stroke(); ctx.restore(); } Feel free to assume any matrix function you need is available.

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• Separate shaders from HTML file in WebGL

  - by Chris Smith

  I'm ramping up on WebGL and was wondering what is the best way to specify my vertex and fragment shaders. Looking at some tutorials, the shaders are embedded directly in the HTML. (And referenced via an ID.) For example: <script id="shader_1-fs" type="x-shader/x-fragment"> precision highp float; void main(void) { // ... } </script> <script id="shader_1-vs" type="x-shader/x-vertex"> attribute vec3 aVertexPosition; uniform mat4 uMVMatrix; // ... My question is, is it possible to have my shaders referenced in a separate file? (Ideally as plain text.) I presume this is straight forward in JavaScript. Is there essentially a way to do this: var shaderText = LoadRemoteFileOnSever('/shaders/shader_1.txt');

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• What happened to GremCheck? Is there a viable replacement?

  - by goober

  I was a big fan of an app called "GremCheck" that was out a while back, that seems to have disappeared. It was a JavaScript included in a master page that placed an icon at the bottom of the page. It was used during testing. You could define your own tests, and the box could pop up per page and viewers would answer the questions you define (such as "Does this page have the correct title?", "Is the Grammar Correct", "Does the design look consistent"). This was useful for end-user tests groups and quick testing for developers if time was squeezed on full functional testing. Anyone know where GremCheck went, if I can get to it, and if there's anything out there that does something similar?

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• Code and Slides: Building the Account at a Glance ASP.NET MVC, EF Code First, HTML5, and jQuery Application

  - by dwahlin

  This presentation was given at the spring 2012 DevConnections conference in Las Vegas and is based on my Pluralsight course. The presentation shows how several different technologies including ASP.NET MVC, EF Code First, HTML5, jQuery, Canvas, SVG, JavaScript patterns, Ajax, and more can be integrated together to build a robust application. An example of the application in action is shown next: View more of my presentations here. The complete code (and associated SQL Server database) for the Account at a Glance application can be found here. Check out the full-length course on the topic at Pluralsight.com.

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• Unity: Assigning a key to perform an action in the inspector

  - by Marc Pilgaard

  I am trying to write a simple piece of code in JavaScript where a button toggles the activation of a shield, by dragging a prefab with Resources.load("ActivateShieldPreFab") and destroying it again (Haven't implemented that yet). I wish to assign this button through the inspector, so I have created a string variable which appears as intended in the inspector. Though it doesn't seem to register the inspector input, even though I changed the value through the inspector. It only provides the error: "Input Key named: is unknown" When the button name is assigned within the code, there is no issues. Code as follows: var ShieldOn = false; var stringbutton : String; function Start(){ } function Update () { if(Input.GetKey(stringbutton) && ShieldOn != true) { Instantiate(Resources.load("ActivateShieldPreFab"), Vector3 (0, 0, 0), Quaternion.identity); ShieldOn = true; } }

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• Open source level editor for HTML5 platform game?

  - by Lai Yu-Hsuan

  A natty GUI editor is very helpful to create level map. I want to use some open-source choices rather than build my own from scratch. I found Tiled Map Editor but it doesn't work for what I want. Though I'm building HTML5 game, I don't have to use a HTML5 level editor as long as it can output well-formatted map files which my javascript can read. Edit: Sorry for the confusion. Tiled does not work for me because to make the player perform a 'tricky' jump, sometimes I want to set the distance between two platforms to, say, 7/3 or 8/3 tiles. But in Tiled I get only 2 or 3. If Tiled can do this, please teach me.

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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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• How to create a good sitemap for dynamic website

  - by Saif Bechan

  I have a website with dynamic content and different kind of pages. I have some pages that rarely change, and I have pages like blogs that change often. The blog pages also have links for sorting, for example sorting on date, asc, desc. On some of the pages I also have links to different tabbed content, and links that are just anchor links. Now when I use a xml sitemap generator then all the links are thrown into the site, and so I don't think all the links are really relevant. The blogposts up until now are also taken into the sitemap. Is this really necessary? I think the links to the blogposts can be indexed just fine. Is the best way to make a sitemap just to manually assign the main menu links to the sitemap, or is indexing everything really recommended?

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• Tomorrow's web development: What's the bearing?

  - by pex

  I just read a wonderful article about headaches web developers have to live with nowadays. Several questions from that article busied me for some time as well. Now I am wondering whether I missed something, whether there are approaches other than Sproutcore or Cappucino to combine the eternal detached worlds of backend and frontend. How to only write validations once? How to collect business logic in only one model? Are we heading toward a combination of CouchDB Views, NodeJS and minimalistic client-side scripts including plenty of XHR requests? Or shall we follow the direction of handling everything except the database on client side? Is everything about JavaScript? I simply ask for approaches of setting up the next web application, for best practices and promising new technologies and frameworks.

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• HG: fork web app project to separate API code from app code

  - by cs_brandt

  I have a web app thats been in active development for about 8 months now and its becoming apparent that the project has a need to maintain a separation between app specific code and our OO Javascript API. What I would like to do is have another repository with the following general structure of the js API code. repo_name | +---build | +---build_tools | +---doc | +---src | +---js Of course this structure is different from the original web app directory structure. If I make changes to this new repository how could I pull in those changes to the web app repository without unintentionally removing files or modifying the directory structure of the web app repository?

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• Possible to set equal height for divs in pairs but only if browser width 960 or wider?

  - by CreateSean

  I'm working on a responsive site where I've found that I've got pairs of divs with heights that I would like to be equal, but only if the browser width is equal to or greater than 960px. Any smaller than that and the divs stack so different heights do not make a difference. DIV 1 | DIV 2 DIV 3 | DIV 4 DIV 5 | DIV 6 DIV 7 | DIV 8 Based on the above set up, Div 1 and Div 2 need to be equal height as do Div 3 and Div 4, but both pairs do not need to be equal to each other. i.e. the pair sets can have different heights but each pair must be equal. Is this possible and if so what is the best approach to take? My javascript/jQuery is rather elementary. I'm sure I could do equal heights alone, but with the pair sets I'm not sure and then adding in the need to set this to only happen if the browser is 960 or wider and I'm lost.

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• Compute if a function is pure

  - by Oni

  As per Wikipedia: In computer programming, a function may be described as pure if both these statements about the function hold: The function always evaluates the same result value given the same argument value(s). The function result value cannot depend on any hidden information or state that may change as program execution proceeds or between different executions of the program, nor can it depend on any external input from I/O devices. Evaluation of the result does not cause any semantically observable side effect or output, such as mutation of mutable objects or output to I/O devices. I am wondering if it is possible to write a function that compute if a function is pure or not. Example code in Javascript: function sum(a,b) { return a+b; } function say(x){ console.log(x); } isPure(sum) // True isPure(say) // False

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• How should modules access data outside their scope?

  - by Joe

  I run into this same problem quite often. First, I create a namespace and then add modules to this namespace. Then issue I always run into is how best to initialize the application? Naturally, each module has its own startup procedure so should this data(not code in some cases, just a list of items to run) stay with the module? Or should there be a startup procedure in the global namespace which has the startup data for ALL the modules. Which is the more robust way of organizing this situation? Should some things be made centralized or should there be strict adherence to modules encapsulating everything about themselves? Though this is a general architecture questions, Javascript centric answers would be really appreciated!

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• Aw, Snap! in Google Chrome [on hold]

  - by D. S. Schneider

  Just wondering if anyone else's experiencing the "Aw, Snap!" bug in Google Chrome. I'm developing a brand new engine which occasionaly triggers this bug and as far as I know, there's nothing one can do to find out what actually triggered the issue. I've also tested my engine with Firefox, which runs just fine. Anyway, just wanted to know if someone else is facing this while developing games for Google Chrome and has a clue about what can be done to avoid it. I'm using plain JavaScript and the audio and canvas elements from HTML5. Thanks!

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• Dynamic PDF output from your .NET project with ReportLab PLUS

  Report Markup Language is an XML-style language for creating PDF documents. We've just written a sample ASP.NET project demonstrating how to use ReportLab's RML2PDF to create PDF documents from inside your .NET project. Create great looking custom dynamic PDFs from your website or application with the minimum of fuss. Download the sample project from here: RML with Microsoft .NET...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• What is the point of the prototype method?

  - by Mild Fuzz

  I am reading through Javascript: The Good Parts, and struggled to get my head around the section on prototypes. After a little google, I came to the conclusion that it is to add properties to objects after the objects declaration. Using this script gleamed from w3schools, I noticed that removing the line adding the prototype property had no effect. So what is the point? //Prototyping function employee(name,jobtitle,born) { this.name=name; this.jobtitle=jobtitle; this.born=born; } var fred=new employee("Fred Flintstone","Caveman",1970); employee.prototype.salary=null; // <--- try removing this line fred.salary=20000; document.write(fred.salary);

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• Drawing shapes dynamically on an image through web browser

  - by Tom Beech

  We have a scenario where we create floor plans of locations when we visit. The floor plan is finally shown on the web. It's come to the point now where we want to show floor plans but have a key with various items on them, when an item on the key is clicked, the image should highlight all the areas of the floorplan that have that specific item. I guess we're looking for some sort of open standard javascript lib to deal with SVG (has to work pre IE9 so pure SVG wont cut it) and the floor plans have to be able to be created through a .net application to be deployed on the web. I'd rather stay away from flash if at all possible to be honest. Below are a few conceptual images of what we're trying to achieve.

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• Why not AJAX'ify entire websites?

  - by Anonymous -

  Is there any solid reasoning as to why sites shouldn't be developed with ajax functionality that loads major parts of each part (assuming there are elements like the header, navigation etc that remain the same)? Surely it would be less resource-intensive since the server wouldn't have to serve content that appears on every page, benefiting both the host and end-user. Answer the question taking into consideration: The sites javascript behaviour degrades gracefully in every instance For my question I'm talking about new sites where this behaviour could be implemented rather from the off, so it doesn't technically cost any money - we're not returning to a finished product to implement it.

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• How can I had some contents from Chrome/Chromium browsers?

  - by MIH1406

  I need to put a "Bookmark us" in my website. But as I searched using Google all the results conclude that no way to do "Bookmark us" for Chrome/Chromium browsers. So I want to either: 1- Hide the content from chrome/chromium browsers. or at least, 2- Show a message if the user's browser is chrome/chromium after clicking that buttong. Here is my "Bookmark Us" script: /** Bookmark Us */ function bookmark_us(url, title){ if(window.sidebar) // firefox window.sidebar.addPanel(title, url, ""); else if(window.opera && window.print){ // opera var elem = document.createElement('a'); elem.setAttribute('href',url); elem.setAttribute('title',title); elem.setAttribute('rel','sidebar'); elem.click(); } else if(document.all) // ie window.external.AddFavorite(url, title); } else { } /** Bookmark Us */ <a href="javascript:bookmark_us('URL','TITLE')">Bookmark Us!</a>

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