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| 145 | 145 | The Neverending (Background Image) Story | Everyone likes candy for Christmas, and there’s none better than eye candy. Well, that, and just more of the stuff. Today we’re going to combine both of those good points and look at how to create a beautiful background image that goes on and on… forever! Of course, each background image is different, so instead of agonising over each and every pixel, I’m going to concentrate on five key steps that you can apply to any of your own repeating background images. In this example, we’ll look at the Miami Beach background image used on the new FOWA site, which I’m afraid is about as un-festive as you can get. 1. Choose your image wisely I find there are three main criteria when judging photos you’re considering for repetition manipulation (or ‘repetulation’, as I like to say)… simplicity (beware of complex patterns) angle and perspective (watch out for shadows and obvious vanishing points) consistent elements (for easy cloning) You might want to check out this annotated version of the image, where I’ve highlighted elements of the photo that led me to choose it as the right one. The original image purchased from iStockPhoto. The Photoshopped version used on the FOWA site. 2. The power of horizontal lines With the image chosen and your cursor poised for some Photoshop magic, the most useful thing you can do is drag out the edge pixels from one side of the image to create a kind of rough colour ‘template’ on which to work over. It doesn’t matter which side you choose, although you might find it beneficial to use the one with the simplest spread of colour and complex elements. Click and hold on the marquee tool in the toolbar and select the ‘single column marquee tool’, which will span the full height of your document but will only be one pixel wide. Make the selection right at the edge of your document, press ctrl-c / cmd-c to copy the selection you made, create a new layer, and hit ctrl-v / cmd-v to paste the selection onto your new layer. using free transform (ctrl-t / cmd-t), drag out your selection so t… | 2007 | Elliot Jay Stocks | elliotjaystocks | 2007-12-03T00:00:00+00:00 | https://24ways.org/2007/the-neverending-background-image-story/ | code |
| 147 | 147 | Christmas Is In The AIR | That’s right, Christmas is coming up fast and there’s plenty of things to do. Get the tree and lights up, get the turkey, buy presents and who know what else. And what about Santa? He’s got a list. I’m pretty sure he’s checking it twice. Sure, we could use an existing list making web site or even a desktop widget. But we’re geeks! What’s the fun in that? Let’s build our own to-do list application and do it with Adobe AIR! What’s Adobe AIR? Adobe AIR, formerly codenamed Apollo, is a runtime environment that runs on both Windows and OSX (with Linux support to follow). This runtime environment lets you build desktop applications using Adobe technologies like Flash and Flex. Oh, and HTML. That’s right, you web standards lovin’ maniac. You can build desktop applications that can run cross-platform using the trio of technologies, HTML, CSS and JavaScript. If you’ve tried developing with AIR before, you’ll need to get re-familiarized with the latest beta release as many things have changed since the last one (such as the API and restrictions within the sandbox.) To get started To get started in building an AIR application, you’ll need two basic things: The AIR runtime. The runtime is needed to run any AIR-based application. The SDK. The software development kit gives you all the pieces to test your application. Unzip the SDK into any folder you wish. You’ll also want to get your hands on the JavaScript API documentation which you’ll no doubt find yourself getting into before too long. (You can download it, too.) Also of interest, some development environments have support for AIR built right in. Aptana doesn’t have support for beta 3 yet but I suspect it’ll be available shortly. Within the SDK, there are two main tools that we’ll use: one to test the application (ADL) and another to build a distributable package of our application (ADT). I’ll get into this some more when we get to that stage of development. Building our To-do list application The first step to building an application within AIR is to cre… | 2007 | Jonathan Snook | jonathansnook | 2007-12-19T00:00:00+00:00 | https://24ways.org/2007/christmas-is-in-the-air/ | code |
| 153 | 153 | JavaScript Internationalisation | or: Why Rudolph Is More Than Just a Shiny Nose Dunder sat, glumly staring at the computer screen. “What’s up, Dunder?” asked Rudolph, entering the stable and shaking off the snow from his antlers. “Well,” Dunder replied, “I’ve just finished coding the new reindeer intranet Santa Claus asked me to do. You know how he likes to appear to be at the cutting edge, talking incessantly about Web 2.0, AJAX, rounded corners; he even spooked Comet recently by talking about him as if he were some pushy web server. “I’ve managed to keep him happy, whilst also keeping it usable, accessible, and gleaming — and I’m still on the back row of the sleigh! But anyway, given the elves will be the ones using the site, and they come from all over the world, the site is in multiple languages. Which is great, except when it comes to the preview JavaScript I’ve written for the reindeer order form. Here, have a look…” As he said that, he brought up the textileRef:8234272265470b85d91702:linkStartMarker:“order form in French”:/examples/javascript-internationalisation/initial.fr.html on the screen. (Same in English). “Looks good,” said Rudolph. “But if I add some items,” said Dunder, “the preview appears in English, as it’s hard-coded in the JavaScript. I don’t want separate code for each language, as that’s just silly — I thought about just having if statements, but that doesn’t scale at all…” “And there’s more, you aren’t displaying large numbers in French properly, either,” added Rudolph, who had been playing and looking at part of the source code: function update_text() { var hay = getValue('hay'); var carrots = getValue('carrots'); var bells = getValue('bells'); var total = 50 * bells + 30 * hay + 10 * carrots; var out = 'You are ordering ' + pretty_num(hay) + ' bushel' + pluralise(hay) + ' of hay, ' + pretty_num(carrots) + ' carrot' + pluralise(carrots) + ', and ' + pretty_num(bells) + ' shiny bell' + pluralise(bells) + ', at a total cost of <strong>' + pretty_num(total) + '</strong> gold pieces. Thank you.';… | 2007 | Matthew Somerville | matthewsomerville | 2007-12-08T00:00:00+00:00 | https://24ways.org/2007/javascript-internationalisation/ | code |
| 157 | 157 | Capturing Caps Lock | One of the more annoying aspects of having to remember passwords (along with having to remember loads of them) is that if you’ve got Caps Lock turned on accidentally when you type one in, it won’t work, and you won’t know why. Most desktop computers alert you in some way if you’re trying to enter your password to log on and you’ve enabled Caps Lock; there’s no reason why the web can’t do the same. What we want is a warning – maybe the user wants Caps Lock on, because maybe their password is in capitals – rather than something that interrupts what they’re doing. Something subtle. But that doesn’t answer the question of how to do it. Sadly, there’s no way of actually detecting whether Caps Lock is on directly. However, there’s a simple work-around; if the user presses a key, and it’s a capital letter, and they don’t have the Shift key depressed, why then they must have Caps Lock on! Simple. DOM scripting allows your code to be notified when a key is pressed in an element; when the key is pressed, you get the ASCII code for that key. Capital letters, A to Z, have ASCII codes 65 to 90. So, the code would look something like: on a key press if the ASCII code for the key is between 65 and 90 *and* if shift is pressed warn the user that they have Caps Lock on, but let them carry on end if end keypress The actual JavaScript for this is more complicated, because both event handling and keypress information differ across browsers. Your event handling functions are passed an event object, except in Internet Explorer where you use the global event object; the event object has a which parameter containing the ASCII code for the key pressed, except in Internet Explorer where the event object has a keyCode parameter; some browsers store whether the shift key is pressed in a shiftKey parameter and some in a modifiers parameter. All this boils down to code that looks something like this: keypress: function(e) { var ev = e ? e : window.event; if (!ev) { return; } var targ = ev.target ? ev.target : ev.srcElement; /… | 2007 | Stuart Langridge | stuartlangridge | 2007-12-04T00:00:00+00:00 | https://24ways.org/2007/capturing-caps-lock/ | code |
| 161 | 161 | Keeping JavaScript Dependencies At Bay | As we are writing more and more complex JavaScript applications we run into issues that have hitherto (god I love that word) not been an issue. The first decision we have to make is what to do when planning our app: one big massive JS file or a lot of smaller, specialised files separated by task. Personally, I tend to favour the latter, mainly because it allows you to work on components in parallel with other developers without lots of clashes in your version control. It also means that your application will be more lightweight as you only include components on demand. Starting with a global object This is why it is a good plan to start your app with one single object that also becomes the namespace for the whole application, say for example myAwesomeApp: var myAwesomeApp = {}; You can nest any necessary components into this one and also make sure that you check for dependencies like DOM support right up front. Adding the components The other thing to add to this main object is a components object, which defines all the components that are there and their file names. var myAwesomeApp = { components :{ formcheck:{ url:'formcheck.js', loaded:false }, dynamicnav:{ url:'dynamicnav.js', loaded:false }, gallery:{ url:'gallery.js', loaded:false }, lightbox:{ url:'lightbox.js', loaded:false } } }; Technically you can also omit the loaded properties, but it is cleaner this way. The next thing to add is an addComponent function that can load your components on demand by adding new SCRIPT elements to the head of the documents when they are needed. var myAwesomeApp = { components :{ formcheck:{ url:'formcheck.js', loaded:false }, dynamicnav:{ url:'dynamicnav.js', loaded:false }, gallery:{ url:'gallery.js', loaded:false }, lightbox:{ url:'lightbox.js', loaded:false } }, addComponent:function(component){ var c = this.components[component]; if(c && c.loaded === false){ var s = document.createElement('script'); s.setAttribut… | 2007 | Christian Heilmann | chrisheilmann | 2007-12-18T00:00:00+00:00 | https://24ways.org/2007/keeping-javascript-dependencies-at-bay/ | code |
| 162 | 162 | Conditional Love | “Browser.” The four-letter word of web design. I mean, let’s face it: on the good days, when things just work in your target browsers, it’s marvelous. The air smells sweeter, birds’ songs sound more melodious, and both your design and your code are looking sharp. But on the less-than-good days (which is, frankly, most of them), you’re compelled to tie up all your browsers in a sack, heave them into the nearest river, and start designing all-imagemap websites. We all play favorites, after all: some will swear by Firefox, Opera fans are allegedly legion, and others still will frown upon anything less than the latest WebKit nightly. Thankfully, we do have an out for those little inconsistencies that crop up when dealing with cross-browser testing: CSS patches. Spare the Rod, Hack the Browser Before committing browsercide over some rendering bug, a designer will typically reach for a snippet of CSS fix the faulty browser. Historically referred to as “hacks,” I prefer Dan Cederholm’s more client-friendly alternative, “patches”. But whatever you call them, CSS patches all work along the same principle: supply the proper property value to the good browsers, while giving higher maintenance other browsers an incorrect value that their frustrating idiosyncratic rendering engine can understand. Traditionally, this has been done either by exploiting incomplete CSS support: #content { height: 1%; // Let's force hasLayout for old versions of IE. line-height: 1.6; padding: 1em; } html>body #content { height: auto; // Modern browsers get a proper height value. } or by exploiting bugs in their rendering engine to deliver alternate style rules: #content p { font-size: .8em; /* Hide from Mac IE5 \*/ font-size: .9em; /* End hiding from Mac IE5 */ } We’ve even used these exploits to serve up whole stylesheets altogether: @import url("core.css"); @media tty { i{content:"\";/*" "*/}} @import 'windows-ie5.css'; /*";} }/* */ The list goes on, and on, and on. For every browser, for every bug, there’s a patch availab… | 2007 | Ethan Marcotte | ethanmarcotte | 2007-12-15T00:00:00+00:00 | https://24ways.org/2007/conditional-love/ | code |
| 163 | 163 | Get To Grips with Slippy Maps | Online mapping has definitely hit mainstream. Google Maps made ‘slippy maps’ popular and made it easy for any developer to quickly add a dynamic map to his or her website. You can now find maps for store locations, friends nearby, upcoming events, and embedded in blogs. In this tutorial we’ll show you how to easily add a map to your site using the Mapstraction mapping library. There are many map providers available to choose from, each with slightly different functionality, design, and terms of service. Mapstraction makes deciding which provider to use easy by allowing you to write your mapping code once, and then easily switch providers. Assemble the pieces Utilizing any of the mapping library typically consists of similar overall steps: Create an HTML div to hold the map Include the Javascript libraries Create the Javascript Map element Set the initial map center and zoom level Add markers, lines, overlays and more Create the Map Div The HTML div is where the map will actually show up on your page. It needs to have a unique id, because we’ll refer to that later to actually put the map here. This also lets you have multiple maps on a page, by creating individual divs and Javascript map elements. The size of the div also sets the height and width of the map. You set the size using CSS, either inline with the element, or via a CSS reference to the element id or class. For this example, we’ll use inline styling. <div id="map" style="width: 400px; height: 400px;"></div> Include Javascript libraries A mapping library is like any Javascript library. You need to include the library in your page before you use the methods of that library. For our tutorial, we’ll need to include at least two libraries: Mapstraction, and the mapping API(s) we want to display. Our first example we’ll use the ubiquitous Google Maps library. However, you can just as easily include Yahoo, MapQuest, or any of the other supported libraries. Another important aspect of the mapping libraries is that many of them require an API k… | 2007 | Andrew Turner | andrewturner | 2007-12-02T00:00:00+00:00 | https://24ways.org/2007/get-to-grips-with-slippy-maps/ | code |
| 164 | 164 | My Other Christmas Present Is a Definition List | A note from the editors: readers should note that the HTML5 redefinition of definition lists has come to pass and is now à la mode. Last year, I looked at how the markup for tag clouds was generally terrible. I thought this year I would look not at a method of marking up a common module, but instead just at a simple part of HTML and how it generally gets abused. No, not tables. Definition lists. Ah, definition lists. Often used but rarely understood. Examining the definition of definitions To start with, let’s see what the HTML spec has to say about them. Definition lists vary only slightly from other types of lists in that list items consist of two parts: a term and a description. The canonical example of a definition list is a dictionary. Words can have multiple descriptions (even the word definition has at least five). Also, many terms can share a single definition (for example, the word colour can also be spelt color, but they have the same definition). Excellent, we can all grasp that. But it very quickly starts to fall apart. Even in the HTML specification the definition list is mis-used. Another application of DL, for example, is for marking up dialogues, with each DT naming a speaker, and each DD containing his or her words. Wrong. Completely and utterly wrong. This is the biggest flaw in the HTML spec, along with dropping support for the start attribute on ordered lists. “Why?”, you may ask. Let me give you an example from Romeo and Juliet, act 2, scene 2. <dt>Juliet</dt> <dd>Romeo!</dd> <dt>Romeo</dt> <dd>My niesse?</dd> <dt>Juliet</dt> <dd>At what o'clock tomorrow shall I send to thee?</dd> <dt>Romeo</dt> <dd>At the hour of nine.</dd> Now, the problem here is that a given definition can have multiple descriptions (the DD). Really the dialog “descriptions” should be rolled up under the terms, like so: <dt>Juliet</dt> <dd>Romeo!</dd> <dd>At what o'clock tomorrow shall I send to thee?</dd> <dt>Romeo</dt> <dd>… | 2007 | Mark Norman Francis | marknormanfrancis | 2007-12-05T00:00:00+00:00 | https://24ways.org/2007/my-other-christmas-present-is-a-definition-list/ | code |
| 165 | 165 | Transparent PNGs in Internet Explorer 6 | Newer breeds of browser such as Firefox and Safari have offered support for PNG images with full alpha channel transparency for a few years. With the use of hacks, support has been available in Internet Explorer 5.5 and 6, but the hacks are non-ideal and have been tricky to use. With IE7 winning masses of users from earlier versions over the last year, full PNG alpha-channel transparency is becoming more of a reality for day-to-day use. However, there are still numbers of IE6 users out there who we can’t leave out in the cold this Christmas, so in this article I’m going to look what we can do to support IE6 users whilst taking full advantage of transparency for the majority of a site’s visitors. So what’s alpha channel transparency? Cast your minds back to the Ghost of Christmas Past, the humble GIF. Images in GIF format offer transparency, but that transparency is either on or off for any given pixel. Each pixel’s either fully transparent, or a solid colour. In GIF, transparency is effectively just a special colour you can chose for a pixel. The PNG format tackles the problem rather differently. As well as having any colour you chose, each pixel also carries a separate channel of information detailing how transparent it is. This alpha channel enables a pixel to be fully transparent, fully opaque, or critically, any step in between. This enables designers to produce images that can have, for example, soft edges without any of the ‘halo effect’ traditionally associated with GIF transparency. If you’ve ever worked on a site that has different colour schemes and therefore requires multiple versions of each graphic against a different colour, you’ll immediately see the benefit. What’s perhaps more interesting than that, however, is the extra creative freedom this gives designers in creating beautiful sites that can remain web-like in their ability to adjust, scale and reflow. The Internet Explorer problem Up until IE7, there has been no fully native support for PNG alpha channel transparency in Internet Expl… | 2007 | Drew McLellan | drewmclellan | 2007-12-01T00:00:00+00:00 | https://24ways.org/2007/supersleight-transparent-png-in-ie6/ | code |
| 168 | 168 | Unobtrusively Mapping Microformats with jQuery | Microformats are everywhere. You can’t shake an electronic stick these days without accidentally poking a microformat-enabled site, and many developers use microformats as a matter of course. And why not? After all, why invent your own class names when you can re-use pre-defined ones that give your site extra functionality for free? Nevertheless, while it’s good to know that users of tools such as Tails and Operator will derive added value from your shiny semantics, it’s nice to be able to reuse that effort in your own code. We’re going to build a map of some of my favourite restaurants in Brighton. Fitting with the principles of unobtrusive JavaScript, we’ll start with a semantically marked up list of restaurants, then use JavaScript to add the map, look up the restaurant locations and plot them as markers. We’ll be using a couple of powerful tools. The first is jQuery, a JavaScript library that is ideally suited for unobtrusive scripting. jQuery allows us to manipulate elements on the page based on their CSS selector, which makes it easy to extract information from microformats. The second is Mapstraction, introduced here by Andrew Turner a few days ago. We’ll be using Google Maps in the background, but Mapstraction makes it easy to change to a different provider if we want to later. Getting Started We’ll start off with a simple collection of microformatted restaurant details, representing my seven favourite restaurants in Brighton. The full, unstyled list can be seen in restaurants-plain.html. Each restaurant listing looks like this: <li class="vcard"> <h3><a class="fn org url" href="http://www.riddleandfinns.co.uk/">Riddle & Finns</a></h3> <div class="adr"> <p class="street-address">12b Meeting House Lane</p> <p><span class="locality">Brighton</span>, <abbr class="country-name" title="United Kingdom">UK</abbr></p> <p class="postal-code">BN1 1HB</p> </div> <p>Telephone: <span class="tel">+44 (0)1273 323 008</span></p> <p>E-mail: <a href="mailto:info@riddleandfinns.co.uk" class="email">info@ri… | 2007 | Simon Willison | simonwillison | 2007-12-12T00:00:00+00:00 | https://24ways.org/2007/unobtrusively-mapping-microformats-with-jquery/ | code |
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