JavaScript lets you supercharge your HTML with animation, interactivity, and visual effects—but many web designers find the language hard to learn. This jargon-free guide covers JavaScript basics and shows you how to save time and effort with the jQuery library of prewritten JavaScript code. You’ll soon be building web pages that feel and act like desktop programs, without having to do much programming.
The important stuff you need to know:
Make your pages interactive. Create JavaScript events that react to visitor actions.
Use animations and effects. Build drop-down navigation menus, pop-ups, automated slideshows, and more.
Improve your user interface. Learn how the pros make websites fun and easy to use.
Collect data with web forms. Create easy-to-use forms that ensure more accurate visitor responses.
Add a dash of Ajax. Enable your web pages to communicate with a web server without a page reload.
Practice with living examples. Get step-by-step tutorials for web projects you can build yourself.
Since 1996, JavaScript: The Definitive Guide has been the bible for JavaScript programmers—a programmer's guide and comprehensive reference to the core language and to the client-side JavaScript APIs defined by web browsers.
The 6th edition covers HTML5 and ECMAScript 5. Many chapters have been completely rewritten to bring them in line with today's best web development practices. New chapters in this edition document jQuery and server side JavaScript. It's recommended for experienced programmers who want to learn the programming language of the Web, and for current JavaScript programmers who want to master it.
"A must-have reference for expert JavaScript programmers...well-organized and detailed."
--Brendan Eich, creator of JavaScript, CTO of Mozilla
"I made a career of what I learned from JavaScript: The Definitive Guide.”
Most programming languages contain good and bad parts, but JavaScript has more than its share of the bad, having been developed and released in a hurry before it could be refined. This authoritative book scrapes away these bad features to reveal a subset of JavaScript that's more reliable, readable, and maintainable than the language as a whole-a subset you can use to create truly extensible and efficient code.
Considered the JavaScript expert by many people in the development community, author Douglas Crockford identifies the abundance of good ideas that make JavaScript an outstanding object-oriented programming language-ideas such as functions, loose typing, dynamic objects, and an expressive object literal notation. Unfortunately, these good ideas are mixed in with bad and downright awful ideas, like a programming model based on global variables.
When Java applets failed, JavaScript became the language of the Web by default, making its popularity almost completely independent of its qualities as a programming language. In JavaScript: The Good Parts, Crockford finally digs through the steaming pile of good intentions and blunders to give you a detailed look at all the genuinely elegant parts of JavaScript, including:
Syntax
Objects
Functions
Inheritance
Arrays
Regular expressions
Methods
Style
Beautiful features
The real beauty? As you move ahead with the subset of JavaScript that this book presents, you'll also sidestep the need to unlearn all the bad parts. Of course, if you want to find out more about the bad parts and how to use them badly, simply consult any other JavaScript book.
With JavaScript: The Good Parts, you'll discover a beautiful, elegant, lightweight and highly expressive language that lets you create effective code, whether you're managing object libraries or just trying to get Ajax to run fast. If you develop sites or applications for the Web, this book is an absolute must.
HTML has been on a wild ride. Sure, HTML started as a mere markup language, but more recently HTML’s put on some major muscle. Now we’ve got a language tuned for building web applications with Web storage, 2D drawing, offline support, sockets and threads, and more. And to speak this language you’ve got to go beyond HTML5 markup and into the world of the DOM, events, and JavaScript APIs.
Now you probably already know all about HTML markup (otherwise known as structure) and you know all aboutCSS style (presentation), but what you’ve been missing is JavaScript (behavior). If all you know about are structure and presentation, you can create some great looking pages, but they’re still just pages. When you add behavior with JavaScript, you can create an interactive experience; even better, you can create full blown web applications.
Head First HTML5 Programming is your ultimate tour guide to creating web applications with HTML5 and JavaScript, and we give you everything you need to know to build them, including: how to add interactivity to your pages, how to communicate with the world of Web services, and how to use the great new APIs being developed for HTML5.
Here are just some of the things you’ll learn in Head First HTML5 Programing:
Learn how to make your pages truly interactive by using the power of the DOM.
Finally understand how JavaScript works and take yourself from novice to well-informed in just a few chapters.
Learn how JavaScript APIs fit into the HTML5 ecosystem, and how to use any API in your web pages.
Use the Geolocation API to know where your users are.
Bring out your inner artist with Canvas, HTML5’s new 2D drawing surface.
Go beyond just plugging a video into your pages, and create custom video experiences.
Learn the secret to grabbing five megabytes of storage in every user’s browser.
Improve your page’s responsiveness and performance with Web workers.
Question : JavaScript?
Does anyone know programs or software that creates the JavaScript tags for you? Im in a class and we have to build sites using JavaScript manually in notepad.
Answer:
I agree with Joanna... you are better off in a simple editor... but you need a good implementation of javascript! Not that stuff that comes with Internet Explorer!I suggest you use Firefox (http://getfirefox.com) for your debugging and syntax checking. Much more helpful errors!and when you get serious you can get a plug-in call firebug... it can trace and debug even easier!
Question : How do I get a javascript variable to appear in a html textfield?
I have a small javascript that pulls data from a flash file and stores them as variables (text string). How do I make that variable appear in a textfield in an html webform?
Answer:
document.getElementById('myfield').value = myVar;ordocument.getElementById('myfield').innerHTML = myVar;It depends on what the element is.
Question : How to fix javascript errors in my windows vista computer?
My pc has javascript error message pops up. My OS is vista. Can u kindly tell me how to fix in in plain English?
Answer:
There are mainly two reasons:1. If you are getting JavaScript error when using a certain program then you can try to update the program and check if the problem is solved, or u can reinstall the program.2. If you are experiencing errors from webpage you can check if Active script, Java applets, or ActiveX is blocked on your browser settings. Check other computer if they are getting Javascript error when opening that website. If yes then the problem lays on the website itself, not your computer.If none of these solutions work, then you have a problem in your system files or registry. Registry cleaner program will scan all errors in your computer and repair them. They will eliminate all possible causes of bugs and errors. Registry easy is the best cleaner among those cleaner. U can easily fix all errors in ur pc like a pc guru:)
Question : How do i work adobe/javascript for youtube?
When i go on youtube it says that i cant watch a video because i don't have javascript turned on or because i have an old version of adobe flash player.I tried to download the new adobe but it still wouldn't work.Can someone help?
Answer:
Here is how to enable javascript.http://www.nasa.gov/home/How_to_enable_Javascript.htmlFor Internet Explorer 8http://en.kioskea.net/forum/affich-118786-enable-javascript-in-internet-explorer-8#5Google Chrome has Javascript automatically on, but it may have been turned off.http://www.mistered.us/tips/javascript/chrome.shtmlAfter you do that, you should be able to watch the videos on YouTube,Good luck.
Question : How do I make my javascript work for youtube?
I recently downloaded firefox and youtube no longer works on my laptop. I downloaded the most recent flash player and I checked to see that the javascript was turned on and it is. I looked it up and those were the two suggestions everyone seemed to have, but its not working. What do I do?
Answer:
If you keep getting "HELLO, YOU EITHER HAVE JAVASCRIPT TURNED OFF OR AN OLD VERSION OF ADOBE'S FLASH PLAYER....GET THE LATEST FLASH PLAYER":don't bother downloading and re-installing the latest Flash over and over and over again.You will get absolutely nowhere doing that, because that is only adding to the problem.There can really be only 3 possibilities:1) something is wrong with YouTube2) something is wrong with your cache3) something is wrong with your Flash1) YOUTUBE:Your problem may fix itself within a couple hours, or by thenext day, because YouTube often "shuts down" a bunch oftheir own servers every single day without warning anybody, in order to update all kinds of stuff. During those occasions, it's really YouTube's data transmissions of "Java" or "Flash"that are poor -- not your reception of it.2) CACHE:If the following day your YouTube is still stuck and showingyou those awful "JavaScript" and "Flash Player" messages, it's possible that your sub-directories of "temporary internet files" and "cache" memory are full, and can't take anymore.This typically results in videos being totally unable to bufferand make it onto your computer screen. "Temporary internet files" are 1000s of tiny bits of websitespermanently put on your computer's hard-drive. They'll stay there forever and ever, gradually plugging up your computer much like hair slowly clogs a sink drain, until you get rid ofthem once and for all (or at least everytime things go awry).Because your computer now has such little space in which to "cache" a video, YouTube will mistakenly think that yourJavaScript is off or that your Flash player (unable to absorbany more videos) is old -- meaning Flash 7 or older.The solution to all that is to exit YouTube (but not your web browser), then clear your "cache" of all its "TIFs", "cookies"and "history". (See below.) After that, shutdown and reboot.3) FLASH:Nothing about watching YouTube has really changed in thepast 2 years. (Technically, you could still even use Flash 8if you wanted to.) It looks like the newest Flash players arecausing many YouTubers a whole lot of grief, especially all 8 variations of version 10.It's absolutely nuts that there's 10.0.525, 10.1.218, 10.2.26,10.2.54, 10.12.10, 10.12.36, 10.15.3 and 10.22.87. Usuallymost updates are good for only 1 thing:...software conflicts.I have never strayed away from 9.47, and there are a bunchof "flashers" who still live by 9.45. Think of those 2 Flasheslike Windows XP compared to Vista. Please have a look atthe "Asker's" response to this other "Best Answer" of mine:http://answers.yahoo.com/question/index?qid=20081125075929AABZpVSIf that seems interesting to you, here is the appropriate link:http://www.oldapps.com/flash_player.php?old_flash_player=14Note 1: if you've got Google Web Accelerator or somethingsimilar to it...dump it, burn it, trash it, disable it, uninstall it, -- do everything you can to get rid of it. GWA conflicts with YouTube. Clicking "Don't Accelerate This Website" will nothelp you whatsoever. Also, most "Messenger" applicationshave a way of mucking up YouTube.Note 2: longer videos may require "Flash" and "Shockwave"in order to play properly. Other than that, avoid those sales pitches that some Yahooers may be shilling, because they are really disguised salespeople & peddlers. Their answershave nothing to do with your question, and their wares mayactually worsen your problem. Besides, what kind of idioticanswer is "Despite the fact you can't even watch or access videos, buy our downloader." [my paraphrase]Note 3: a very odd fix that once worked for me was alteringthe URL from "www.youtube.com" to simply "youtube.com"(or you could even try "ca.youtube.com").Note 4: there's always the strange possibility that you mayhave gone through the whole process of downloading Flash, BUT DID YOU ACTUALLY INSTALL IT? If you have Firefox,did you "enable" the Flash "add-on"?I hope that my information proves to be quite helpful to you.Internet Explorer 6:→ Tools → Internet Options → Delete Cookies → OK→ Delete Files → OK→ Clear History → Yes → OKInternet Explorer 7:→ Tools → Internet Options → Delete...→ Delete files → Yes→ Delete cookies → OK→ Delete history → OK→ Close (browsing history window)→ OKMozilla Firefox→ Tools → Clear Private Data[x] Browsing History[x] Download History[x] Saved Form and Search History[x] Cache[x] Cookies→ Clear Private Data NowApple Safari 3:→ Edit → Preferences→ Security (tab) → Show Cookies→ Remove All → Doneafter that:→ Safari → Empty Cache → Emptyafter that:→ History → Clear History
Question : How ethical to use Javascript libraries that are available on the net?
I want to do something with JavaScript on my website but don't know how to implement it, but i've found it has already been written by someone and is available to download free as they've put it on net.So is it right morally to use something that someone has already been written? does this count as cheating? does it infringe any copyright?
Answer:
I have used jquery libraries after making sure that the libraries are covered under the GPL license. Most, if not all jquery libraries are under such libraries. Please read the license before you use it on your site. In most cases, you have to include the lib in your distribution. I go a head and do that anyway.Take a look at http://whatiscopyright.org/ it will help a lot.
Question : Javascript?
I'm not allowed to use spellcheck, cannot edit my questions, cannot press "show" on hidden (-5) answers. It says "must have Javascript enabled."I've gone to Tools, Internet Options, followed that whole thing.I've gone to Java.com and downloaded the latest version.Any other ideas? This sucks
Answer:
Welll, either it's a temporary thing due to the tinkering that Yahoo is doing today in Answers (although I'm not having that problem today) or perhaps you could retrace your steps: Tools, Internet Options, Security tab, Custom Level, look for "Scripting" heading (there are lots of scripting items, you want the one that just says Scripting), the sub-heading is Active Scripting, click enable, click OK at the bottom, click Yes to the warning message, click OK again.
Question : How can I make javascript work on my computer?
I've done the "enable javascript" thing, and I've downloaded the update several times and it always says it is successful, but still I can't go on any websites. I also tried downloading it to my desktop. it still always says, "you need to update or enable javascript". how else can I fix it?
Answer:
Its possible that you have a anti spyware or virus blocker of some kind that is not letting you use java. try disabling the anti spyware and any other blockers you may have. it mite put your computar at risk but at least you will kow what it was.
Question : How do I code a text that shows up only if Javascript isn't enabled in the browser?
What is the code to display text only when the user doesn't have javascript enabled (so it would say "you need javascript enabled to view this) but doesn't show up when javascript IS enabled, just running the script? I hope that makes sense. Thanks!
Answer:
You need to have JavaScript enabled.
The simplest way would perhaps be to use the
Question : How to write a JavaScript expression that produces true if a string s contains a comma, and false otherwise?
I need write a JavaScript expression that produces true if a string s contains a comma, andfalse otherwise. I am not sure how to do this, thanks for the help!
Answer:
see the indexOf functionhttp://www.w3schools.com/jsref/jsref_indexof.asp(check for return value of -1.)
