About.com Focus on JavaScript

Unobtrusive JavaScript

Sat, 07 Nov 2009 05:24:26 +0000

JavaScript belongs in a separate file linked from the head of your page.

There is no longer any need to clutter the body of your web page with event handlers attached to tags and scripts embedded in between content. By using a few simple coding techniques we can remove all of that from the body of the web page and place it all into a separate JavaScript file that we link into our page with a simple script tag in the head of the page.

Unobtrusive JavaScript

Unobtrusive JavaScript originally appeared on About.com Focus on JavaScript on Saturday, November 7th, 2009 at 05:24:26.

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Feature Sensing

Fri, 06 Nov 2009 15:10:03 +0000

Test if the browser supports a specific JavaScript Feature directly, do not test whether the browser was one that did or didn't support that feature ten years ago.

Right from day one JavaScript has provided a simple way to check whether the version of JavaScript currently being run supports a given object, method or function. The same (or similar code) can also be used to check if a property or variable exists. Using this way of testing if the browser supports your script your script will always work in new browsers that add that support even where the prior version didn't.

Feature Sensing

Feature Sensing originally appeared on About.com Focus on JavaScript on Friday, November 6th, 2009 at 15:10:03.

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Functions and Object Constructors

Thu, 05 Nov 2009 08:58:32 +0000

JavaScript doesn't have classes but objects can inherit directly from other objects

In JavaScript object constructors are defined the same way you define a function. What distinguishes one from the other is the way it is called. By testing how it was called inside your function you can make functions that are also object constructors or can test if it is called the right way.

Functions and Object Constructors

Functions and Object Constructors originally appeared on About.com Focus on JavaScript on Thursday, November 5th, 2009 at 08:58:32.

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Character Order

Wed, 04 Nov 2009 15:37:03 +0000

Characters don't have to be adjacent to be able to validate them with JavaScript

It isn't just the characters that are next to one another in the input text that may need validating. Sometimes the order in which certain characters is important regardless of whether they are next to one another or at opposite ends of the text. The ninth form validation tutorial shows you how to test for one character must follow another in the text.

Character Order

Character Order originally appeared on About.com Focus on JavaScript on Wednesday, November 4th, 2009 at 15:37:03.

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JavaScript Split

Tue, 03 Nov 2009 09:39:08 +0000

The name of the method to call to split a string in JavaScript is rather obvious.

JavaScript has some very powerful options for being able to split up a string of text and place the results into an array.

JavaScript Split

JavaScript Split originally appeared on About.com Focus on JavaScript on Tuesday, November 3rd, 2009 at 09:39:08.

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JavaScript Windows

Mon, 02 Nov 2009 08:18:27 +0000

Do you really want to try to force your visitors to open a page in a new window?

Modern browsers allow the browser owner to choose how they want new pages to be processed - that'w why the target attribute doesn't exist in HTML 4. You can still use a JavaScript window.open call to suggest that a page should open in a new window when you have a really good reason for it.

JavaScript Windows

JavaScript Windows originally appeared on About.com Focus on JavaScript on Monday, November 2nd, 2009 at 08:18:27.

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Pattern Matching

Sun, 01 Nov 2009 17:07:20 +0000

JavaScript supports most regular expression constructs.

Introducing a new series of tutorials on regular expressions. In this first tutorial we look at how to define a regular expression and use it to test if a text field contains some particular text.

Pattern Matching

Pattern Matching originally appeared on About.com Focus on JavaScript on Sunday, November 1st, 2009 at 17:07:20.

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Advanced String Method Reference

Sat, 31 Oct 2009 15:52:32 +0000

JavaScript has lots of ways to work with text strings.

One of the popular uses for JavaScript is for form validation and when validating forms one of the things you most often need to do is to perform tests on the text strings that have been entered to see if they are valid. Here's a reference to the more advanced (and also more useful) methods that JavaScript makes available for this purpose.

Advanced String Method Reference

Advanced String Method Reference originally appeared on About.com Focus on JavaScript on Saturday, October 31st, 2009 at 15:52:32.

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Math Method Reference

Fri, 30 Oct 2009 15:40:27 +0000

JavaScript understands mathematics

You work with mathematical functions in JavaScript using the Math static object. This reference page lists all of the available functions as well as a number of useful constants that this object also makes available.

Math Method Reference

Math Method Reference originally appeared on About.com Focus on JavaScript on Friday, October 30th, 2009 at 15:40:27.

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Array Reference

Thu, 29 Oct 2009 05:44:45 +0000

JavaScript allows all sorts of manipulations to be done with arrays

Arrays are the ideal way of handling multiple occurrences of similar data. In addition to being able to access individual entries by their numerical position within the array, JavaScript also provides ways of easily adding or removing any entry or entries as well as easy ways of splitting or joining arrays.

Array Reference

Array Reference originally appeared on About.com Focus on JavaScript on Thursday, October 29th, 2009 at 05:44:45.

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