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January 2008 - Posts

Write your own DOM friendly extension methods for HtmlElement in Volta

I know there are GetById, GetById<> methods in Document object. But, I often miss a method that I feel should be in Volta, which iterates through its child nodes and find an element for me. Let us say, there is a HTML like the following:<div Read More
posted Tuesday, January 29, 2008 12:26 PM by TanzimSaqib | 0 Comments
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Appearing on Microsoft Volta team blog

Microsoft Volta team blogged about me and one of my articles: http://labs.live.com/volta/blog/Volta+How+To+Flickr+Widget.aspx Read More
posted Saturday, January 26, 2008 2:03 PM by TanzimSaqib | 0 Comments
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[New Article] ASP.NET AJAX Best Practices

While we develop AJAX applications, we often carelessly ignore giving up bad practices, which cause effects which are not so significantly visible when the site is not so large in volume. But, it’s often severe performance issue when it is the case for Read More
posted Saturday, January 26, 2008 11:21 AM by TanzimSaqib | 0 Comments
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HttpRequestFactory vs. XMLHttpRequest in Volta

HttpRequestFactory was designed for use by tiersplitting internally and was not supposed to be exposed as part of the Volta API as Danny van Velzen from Microsoft Volta team told me today. So, its better if you use XMLHttpRequest instead because this Read More
posted Friday, January 25, 2008 9:16 AM by TanzimSaqib | 0 Comments
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[New Article] Building a Volta Control : A Flickr Widget

This is my first article which is based on the first CTP of Volta considering its current limitations. You will see how you can create a Volta control that the compiler can convert into an AJAX Widget without requiring us writing a single line of JavaScript Read More
posted Friday, January 18, 2008 12:38 PM by TanzimSaqib | 0 Comments
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ASP.NET AJAX Best Practices: Avoid String concatenation, use Array instead

Don't you think the following block of code has written keeping every possible good practice in mind? Any option for performance improvement?function pageLoad() { var stringArray = new Array(); // Suppose there're a lot of strings in Read More
posted Tuesday, January 15, 2008 1:36 AM by TanzimSaqib | 0 Comments
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How to solve: Server Controls can't be accessed in View's code-behind in ASP.NET MVC

It's still long way to go for a final release of ASP.NET MVC, the one I've been using right now is just a December CTP. But, like me you might be experiencing this confusing problem. The server controls that you put in a View (ViewContentPage) can not Read More
posted Monday, January 14, 2008 12:38 PM by TanzimSaqib | 0 Comments
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ASP.NET AJAX Best Practices: Introduce function delegates

Take a look at the following loop. This loop calls a function in each iteration and the function does some stuffs. Can you think of any performance improvement idea?for(var i=0; i<count; ++i) processElement(elements); Well, for sufficiently large Read More
posted Sunday, January 13, 2008 1:33 AM by TanzimSaqib | 0 Comments
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ASP.NET AJAX Best Practices: Introduce DOM elements and function caching

We have seen DOM caching before and function delegation is also a kind of function caching. Take a look at the following snippet:for(var i=0; i<count; ++i) $get('divContent').appendChild(elements); As you can figure out the code is going to be Read More
posted Saturday, January 12, 2008 1:28 AM by TanzimSaqib | 0 Comments
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ASP.NET AJAX Best Practices: Problem with switch

Unlike .NET languages or any other compiler languages, JavaScript interpreter can not optimize switch block. Especially when switch statement is used with different types of data, it's a heavy operation for the browser due to conversion operations occur Read More
posted Friday, January 11, 2008 1:26 AM by TanzimSaqib | 0 Comments
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ASP.NET AJAX Best Practices: Avoid using Array.length in a loop

In one of my earlier posts, I talked about DOM element accessing in a loop but forgot to talk about a very common, yet performance issue in AJAX. We often use code like the following:var items = []; // Suppose a very long array for(var i=0; i<items.length; Read More
posted Thursday, January 10, 2008 12:52 PM by TanzimSaqib | 0 Comments
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Make web.config work in Volta

  Ever wondered how to make web.config work in Volta first CTP release? Simply add a web.config file and add content to it? Unfortunately this is not the case in Volta at least in the first CTP. Five steps to get it done: Add a web.config file Read More
posted Wednesday, January 09, 2008 12:37 PM by TanzimSaqib | 0 Comments

ASP.NET AJAX Best Practices: Avoid getters, setters

Make minimum use of setters and getters if possible. Such accessors look like .NET like kind of beautiful properties, but these create new more scopes for JavaScript interpreter to deal with. If applicable, try directly setting/getting the private variable Read More
posted Tuesday, January 08, 2008 8:08 PM by TanzimSaqib | 0 Comments
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ASP.NET AJAX Best Practices: Reduce scopes

It's not pretty common. But, if you ever encounter such code, be sure it's a very bad practice. Introducing more scopes is a performance issue for JavaScript interpreter. It adds a new scope in the ladder. See the following sample scope:function pageLoad() Read More
posted Monday, January 07, 2008 2:30 PM by TanzimSaqib | 0 Comments
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ASP.NET AJAX Best Practices: Avoid using your own method while there is one

Avoid implementing your own getElementById method that will cause script to DOM marshalling overhead. Each time you traverse the DOM and look for certain HTML element requires the JavaScript interpreter to marshalling script to DOM. It's always better Read More
posted Sunday, January 06, 2008 2:11 PM by TanzimSaqib | 0 Comments
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ASP.NET AJAX Best Practices: Careful with DOM element concatenation

It's a very common bad practice. We often iterate through array, build HTML contents and keep on concatenating into certain DOM element. Every time you execute the block of code under the loop, you create the HTML markups, discover a div, access the innerHTML Read More
posted Saturday, January 05, 2008 11:14 AM by TanzimSaqib | 0 Comments
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ASP.NET AJAX Best Practices: Use more "var"

Less use of "var" can result into wrong calculation as well as mistake in logic control. And also JavaScript interpreter finds it hard to determine the scope of the variable if var is not used. Consider the following simple JavaScript code:function pageLoad() Read More
posted Friday, January 04, 2008 11:03 AM by TanzimSaqib | 0 Comments
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Make HTML controls discoverable in Volta Control

  When a Volta control is rendered, the ID attribute of the generated HTML is changed to something like _vcId_1_DivName which is inconvenient to find from code. But the ID attribute stays the same in case of Volta Page, so it is discoverable by Read More
posted Thursday, January 03, 2008 12:36 PM by TanzimSaqib | 0 Comments
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Making cross domain AJAX call using Volta

  Making a cross domain AJAX call in Volta is piece of cake. Volta compiler generates necessary client codes to make it work. Here is a snippet that can make an AJAX call to some Url and fetch data: public void DownloadPhotos() { IHttpRequest Read More
posted Wednesday, January 02, 2008 12:34 PM by TanzimSaqib | 0 Comments
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Namespace Alias Qualifier - to get rid of crazy coding

Let us say somebody in your company loves crazy coding and really do not bother about his/her codes affect others. (S)He put class name System and a constant Console and now wondering how come a simple Console.WriteLine does not compile: class System Read More
posted Tuesday, January 01, 2008 12:35 PM by TanzimSaqib | 0 Comments
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