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Most server-side scripting languages, like PHP, come with built-in functionality for reading query strings. Javascript doesn’t have any kind of standard counterpart, but that doesn’t mean you can’t use query strings in Javascript.

With some String functions, you can create your own function to parse a query string attached to the request url and store it in an associative array - just like PHP would for you.
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I came across this problem on the forums today. How can you randomize which Ad Sense ad to show using Javascript?

The solution, it turns out, is very simple.
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Yesterday, I wrote a short article on generating random numbers in Javascript. The Javascript random number generator is similar to C/++ - it gives you a random number from 0 to 1 and you need to make it useful.

At the suggestion of a reader (thanks Justin), I decided to go ahead and turn the general formula for this into a short helper function to generate a random number.
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I’ve been working with PHP for some time now, and I’ve become spoiled with the rand() function for generating random numbers. It’s so simple - pass a min, pass a max, and get the number you want.

While I was working on various game-related scripts this weekend, I was left wondering how to create a random number in Javascript. It’s not quite as simple as the rand() function - we’ll have to go back to the old C-style random number generation.
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This morning I set about making a simple script to clean extra newline characters out of text. I could easily have processed the form contents in PHP, but I wanted to use Javascript to avoid reloading the page.

The concept seemed simple enough, but I ran into a problem - I didn’t know how to do string replacement in Javascript. The first thing I thought was, “What is the Javascript equivalent to str_replace?”
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In a recent post, I sketched out how to use Javascript to build a gameboard for a browser-based game - specifically Tic Tac Toe. After a little tweaking, I’ve worked this into a functioning Tic Tac Toe board.

In this post, we’ll explore the code used to set up this board. Once that’s done, the next step will be to create a php script to evaluate some of the game’s logic.
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A thorough knowledge of Javascript can give you tremendous control over what happens on a website. Combined with PHP through an AJAX request, you can make some pretty nifty browser-based games.

This tutorial will focus on the first part of making a basic board game - creating a board. The end result will be a three by three game board suitable for use in developing a tic-tac-toe game.
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