{"rowid": 121, "title": "Hide And Seek in The Head", "contents": "If you want your JavaScript-enhanced pages to remain accessible and understandable to scripted and noscript users alike, you have to think before you code. Which functionalities are required (ie. should work without JavaScript)? Which ones are merely nice-to-have (ie. can be scripted)? You should only start creating the site when you\u2019ve taken these decisions.\n\nSpecial HTML elements\n\nOnce you have a clear idea of what will work with and without JavaScript, you\u2019ll likely find that you need a few HTML elements for the noscript version only.\n\nTake this example: A form has a nifty bit of Ajax that automatically and silently sends a request once the user enters something in a form field. However, in order to preserve accessibility, the user should also be able to submit the form normally. So the form should have a submit button in noscript browsers, but not when the browser supports sufficient JavaScript.\n\nSince the button is meant for noscript browsers, it must be hard-coded in the HTML:\n\n\n\nWhen JavaScript is supported, it should be removed:\n\nvar checkJS = [check JavaScript support];\nwindow.onload = function () {\n\tif (!checkJS) return;\n\tdocument.getElementById('noScriptButton').style.display = 'none';\n}\n\nProblem: the load event\n\nAlthough this will likely work fine in your testing environment, it\u2019s not completely correct. What if a user with a modern, JavaScript-capable browser visits your page, but has to wait for a huge graphic to load? The load event fires only after all assets, including images, have been loaded. So this user will first see a submit button, but then all of a sudden it\u2019s removed. That\u2019s potentially confusing.\n\nFortunately there\u2019s a simple solution: play a bit of hide and seek in the
:\n\nvar checkJS = [check JavaScript support];\nif (checkJS) {\n\tdocument.write('');\n}\n\nFirst, check if the browser supports enough JavaScript. If it does, document.write an extra \n\nSo we end up with a nice simple to understand but also quick to write XSL which can be used on ATOM Flickr feeds and ATOM News feeds. With a little playing around with XSL, you can make XML beautiful again.\n\nAll the files can be found in the zip file (14k)", "year": "2006", "author": "Ian Forrester", "author_slug": "ianforrester", "published": "2006-12-07T00:00:00+00:00", "url": "https://24ways.org/2006/beautiful-xml-with-xsl/", "topic": "code"} {"rowid": 137, "title": "Cheating Color", "contents": "Have you ever been strapped to use specific colors outlined in a branding guide? Felt restricted because those colors ended up being too light or dark for the way you want to use them?\n\nHere\u2019s the solution: throw out your brand guide.\n\ngasp!\n\nOK, don\u2019t throw it out. Just put it in a drawer for a few minutes.\n\nBranding Guides be Damned\n\nWhen dealing with color on screen, it\u2019s easy to get caught up in literal values from hex colors, you can cheat colors ever so slightly to achieve the right optical value. This is especially prevalent when trying to bring a company\u2019s identity colors to a screen design. Because the most important idea behind a brand guide is to help a company maintain the visual integrity of their business, consider hex numbers to be guidelines rather than law. Once you are familiar enough with the colors your company uses, you can start to flex them a bit, and take a few liberties.\n\nThis is a quick method for cheating to get the color you really want. With a little sleight of design, we can swap a color that might be part of your identity guidelines, with one that works better optically, and no one will be the wiser!\n\nColor is a Wily Beast\n\nThis might be hard: You might have to break out of the idea that a color can only be made using one method. Color is fluid. It interacts and changes based on its surroundings. Some colors can appear lighter or darker based on what color they appear on or next to. The RGB gamut is additive color, and as such, has a tendency to push contrast in the direction that objects may already be leaning\u2014increasing the contrast of light colors on dark colors and decreasing the contrast of light on light. Obviously, because we are talking about monitors here, these aren\u2019t hard and fast rules.\n\nCheat and Feel Good About It\n\nOn a light background, when you have a large element of a light color, a small element of the same color will appear lighter.\n\nEnter our fake company: Double Dagger. They manufacture footnotes. Take a look at Fig. 1 below. The logo (Double Dagger), rule, and small text are all #6699CC. Because the logo so large, we get a good sense of the light blue color. Unfortunately, the rule and small text beneath it feel much lighter because we can\u2019t create enough contrast with such small shapes in that color.\n\nNow take a look at Fig. 2. Our logo is still #6699CC, but now the rule and smaller text have been cheated to #4477BB, effectively giving us the same optical color that we used in the logo. You will find that we get a better sense of the light blue, and the added benefit of more contrast for our text. Doesn\u2019t that feel good?\n\n\n\nConversely, when you have a large element of a dark color, a small element of the same color will appear darker.\n\nLet\u2019s look at Fig. 3 below. Double Dagger has decided to change its identity colors from blue to red. In Fig. 3, our logo, rule, and small text are all #330000, a very dark red. If you look at the rule and small text below the logo, you will notice that they seem dark enough to be confused with black. The dark red can\u2019t be sustained by the smaller shapes. Now let\u2019s look at Fig. 4. The logo is still #33000, but we\u2019ve now cheated the rule and smaller text to #550000. This gives us a better sense of a red, but preserves the dark and moody direction the company has taken.\n\n\n\nBut we\u2019ve only touched on color against a white background. For colors against a darker background, you may find lighter colors work fine, but darker colors need to be cheated a bit to the lighter side in order to reach a good optical equivalent. Take a look below at Fig. 5 and Fig. 6. Both use the same exact corresponding colors as Fig. 1 and Fig. 2 above, but now they are set against a dark background. Where the blue used in Fig. 1 above was too light for the smaller elements, we find it is just right for them in Fig. 5, and the darker blue we used in Fig. 2 has now proven too dark for a dark background, as evidenced in Fig. 6.\n\n\n\nYour mileage may vary, and this may not be applicable in all situations, but consider it to be just another tool on your utility belt for dealing with color problems.", "year": "2006", "author": "Jason Santa Maria", "author_slug": "jasonsantamaria", "published": "2006-12-23T00:00:00+00:00", "url": "https://24ways.org/2006/cheating-color/", "topic": "design"} {"rowid": 138, "title": "Rounded Corner Boxes the CSS3 Way", "contents": "If you\u2019ve been doing CSS for a while you\u2019ll know that there are approximately 3,762 ways to create a rounded corner box. The simplest techniques rely on the addition of extra mark-up directly to your page, while the more complicated ones add the mark-up though DOM manipulation. While these techniques are all very interesting, they do seem somewhat of a kludge. The goal of CSS is to separate structure from presentation, yet here we are adding superfluous mark-up to our code in order to create a visual effect. The reason we are doing this is simple. CSS2.1 only allows a single background image per element.\n\nThankfully this looks set to change with the addition of multiple background images into the CSS3 specification. With CSS3 you\u2019ll be able to add not one, not four, but eight background images to a single element. This means you\u2019ll be able to create all kinds of interesting effects without the need of those additional elements.\n\nWhile the CSS working group still seem to be arguing over the exact syntax, Dave Hyatt went ahead and implemented the currently suggested mechanism into Safari. The technique is fiendishly simple, and I think we\u2019ll all be a lot better off once the W3C stop arguing over the details and allow browser vendors to get on and provide the tools we need to build better websites.\n\nTo create a CSS3 rounded corner box, simply start with your box element and apply your 4 corner images, separated by commas.\n\n.box {\n\tbackground-image: url(top-left.gif), url(top-right.gif), url(bottom-left.gif), url(bottom-right.gif);\n}\n\nWe don\u2019t want these background images to repeat, which is the normal behaviour, so lets set all their background-repeat properties to no-repeat.\n\n.box {\n\tbackground-image: url(top-left.gif), url(top-right.gif), url(bottom-left.gif), url(bottom-right.gif);\n\tbackground-repeat: no-repeat, no-repeat, no-repeat, no-repeat;\n}\n\nLastly, we need to define the positioning of each corner image.\n\n.box {\n\tbackground-image: url(top-left.gif), url(top-right.gif), url(bottom-left.gif), url(bottom-right.gif);\n\tbackground-repeat: no-repeat, no-repeat, no-repeat, no-repeat;\n\tbackground-position: top left, top right, bottom left, bottom right;\n}\n\nAnd there we have it, a simple rounded corner box with no additional mark-up.\n\nAs well as using multiple background images, CSS3 also has the ability to create rounded corners without the need of any images at all. You can do this by setting the border-radius property to your desired value as seen in the next example.\n\n.box {\n\tborder-radius: 1.6em;\n}\n\nThis technique currently works in Firefox/Camino and creates a nice, if somewhat jagged rounded corner. If you want to create a box that works in both Mozilla and WebKit based browsers, why not combine both techniques and see what happens.", "year": "2006", "author": "Andy Budd", "author_slug": "andybudd", "published": "2006-12-04T00:00:00+00:00", "url": "https://24ways.org/2006/rounded-corner-boxes-the-css3-way/", "topic": "code"} {"rowid": 139, "title": "Flickr Photos On Demand with getFlickr", "contents": "In case you don\u2019t know it yet, Flickr is great. It is a lot of fun to upload, tag and caption photos and it is really handy to get a vast network of contacts through it. \n\nUsing Flickr photos outside of it is a bit of a problem though. There is a Flickr API, and you can get almost every page as an RSS feed, but in general it is a bit tricky to use Flickr photos inside your blog posts or web sites. You might not want to get into the whole API game or use a server side proxy script as you cannot retrieve RSS with Ajax because of the cross-domain security settings.\n\nHowever, Flickr also provides an undocumented JSON output, that can be used to hack your own solutions in JavaScript without having to use a server side script.\n\n\n\tIf you enter the URL http://flickr.com/photos/tags/panda you get to the flickr page with photos tagged \u201cpanda\u201d.\n\tIf you enter the URL http://api.flickr.com/services/feeds/photos_public.gne?tags=panda&format=rss_200 you get the same page as an RSS feed.\n\tIf you enter the URL http://api.flickr.com/services/feeds/photos_public.gne?tags=panda&format=json you get a JavaScript function called jsonFlickrFeed with a parameter that contains the same data in JSON format\n\n\nYou can use this to easily hack together your own output by just providing a function with the same name. I wanted to make it easier for you, which is why I created the helper getFlickr for you to download and use.\n\ngetFlickr for Non-Scripters\n\nSimply include the javascript file getflickr.js and the style getflickr.css in the head of your document:\n\n\n\n\nOnce this is done you can add links to Flickr pages anywhere in your document, and when you give them the CSS class getflickrphotos they get turned into gallery links. When a visitor clicks these links they turn into loading messages and show a \u201cpopup\u201d gallery with the connected photos once they were loaded. As the JSON returned is very small it won\u2019t take long. You can close the gallery, or click any of the thumbnails to view a photo. Clicking the photo makes it disappear and go back to the thumbnails.\n\nCheck out the example page and click the different gallery links to see the results.\n\nNotice that getFlickr works with Unobtrusive JavaScript as when scripting is disabled the links still get to the photos on Flickr.\n\ngetFlickr for JavaScript Hackers\n\nIf you want to use getFlickr with your own JavaScripts you can use its main method leech():\n\ngetFlickr.leech(sTag, sCallback);\n\n \n\tsTag\n\tthe tag you are looking for\n\tsCallback\n\tan optional function to call when the data was retrieved.\n \n\nAfter you called the leech() method you have two strings to use:\n\n \n\tgetFlickr.html[sTag]\n\tcontains an HTML list (without the outer UL element) of all the images linked to the correct pages at flickr. The images are the medium size, you can easily change that by replacing _m.jpg with _s.jpg for thumbnails.\n\tgetFlickr.tags[sTag]\n\tcontains a string of all the other tags flickr users added with the tag you searched for(space separated)\n \n\nYou can call getFlickr.leech() several times when the page has loaded to cache several result feeds before the page gets loaded. This\u2019ll make the photos quicker for the end user to show up. If you want to offer a form for people to search for flickr photos and display them immediately you can use the following HTML:\n\n\n\nAll the JavaScript you\u2019ll need (for a basic display) is this:\n\nfunction populate(){\n var tag = document.getElementById('tag').value;\n document.getElementById('photos').innerHTML = getFlickr.html[tag].replace(/_m\\.jpg/g,'_s.jpg');\n document.getElementById('tags').innerHTML = getFlickr.tags[tag];\n return false;\n}\n\nEasy as pie, enjoy!\n\nCheck out the example page and try the form to see the results.", "year": "2006", "author": "Christian Heilmann", "author_slug": "chrisheilmann", "published": "2006-12-03T00:00:00+00:00", "url": "https://24ways.org/2006/flickr-photos-on-demand/", "topic": "code"} {"rowid": 140, "title": "Styling hCards with CSS", "contents": "There are plenty of places online where you can learn about using the hCard microformat to mark up contact details at your site (there are some resources at the end of the article). But there\u2019s not yet been a lot of focus on using microformats with CSS. So in this installment of 24 ways, we\u2019re going to look at just that \u2013 how microformats help make CSS based styling simpler and more logical.\n\nBeing rich, quite complex structures, hCards provide designers with a sophisticated scaffolding for styling them. A recent example of styling hCards I saw, playing on the business card metaphor, was by Andy Hume, at http://thedredge.org/2005/06/using-hcards-in-your-blog/. While his approach uses fixed width cards, let\u2019s take a look at how we might style a variable width business card style for our hCards.\n\nLet\u2019s take a common hCard, which includes address, telephone and email details\n\nWeb Directions North\n\t\t\n\t\t\t\n\t
Web Directions Conference Pty Ltd
Phone/Fax: Work:\n\t\t61 2 9365 5007
\n\tEmail: info@webdirections.org
\nEmail: info@webdirections.org
\n\nTypically, in hCard, the value part of this property isn\u2019t required, and we could get away with\n\ninfo@webdirections.org\n\nThe form I\u2019ve used, with the span of class value is however, perfectly valid hCard markup (hard allows for multiple email addresses of different types, which is where this typically comes in handy). Why have I gone to all this trouble? Well, when it came to styling the hCard, I realized I needed a block element to attach the background image for the bottom right hand corner to. Typically the last block element in the containing element is the ideal choice (and sometimes it\u2019s possible to take an inline element, for example the link here, and use CSS to make it a block element, and attach it to that, but that really doesn\u2019t work with this design).\n\nSo, if we are going to use the paragraph which contains the email link, we need a way to select it exclusively, which means that with CSS2 at least, we need a class or id as a hook for our CSS selector (in CSS3 we could use the last-child selector, which selects the last child element of a specified element, but again, as last child is not widely supported, we won\u2019t rely on it here.)\n\nSo, the least worst thing we could do is take an existing element, and add some reasonably meaningful markup to it. That\u2019s why we gave the paragraph a class of email, and the email address a class of value. Which reminds me a little of a moment in Hamlet\n\n\n\tThe lady doth protest too much, methinks\n\n\nOK, let\u2019s get back to the CSS.\n\nWe add the bottom right corner image, positioning it in the bottom right of the element, and making sure it doesn\u2019t repeat. We also add some padding to the bottom, to balance out the padding we added to the top of the hCard.\n\np.email {\n\tbackground-image: url(images/bottom-right.png);\n\tbackground-position: right bottom;\n\tbackground-repeat: no-repeat;\n\tpadding-bottom: 2em;\n}\n\nWhich all goes to make our hCard look like this\n\n\n\nIt just remains for us to clean up a little.\n\nLet\u2019s start from the top. We\u2019ll float the download image to the right like this\n\n.vcard img {\n\tfloat: right;\n\tpadding-right: 1em;\n\tmargin-top: -1em\n}\n\nSee how we didn\u2019t have to add a class to style the image, we used the fact that the image is a descendent of the vcard element, and a descendent selector. In my experience, the very widely supported, powerful descendent selector is one of the most underused aspects of CSS. So if you don\u2019t use it frequently, look into it in more detail.\n\nWe added some space to the right of the image, and pulled it up a bit closer to the top of the hCard, like this\n\n\n\nWe also want to add some whitespace between the edge of the hCard and the text. We would typically add padding to the left of the containing element, (in this case the vcard element) but this would break our bottom left hand corner, like this\n\n\n\nThat\u2019s because the div element we added this bottom left background image to would be moved in by the padding on its containing element.\n\nSo instead, we add left margin to all the paragraphs in the hCard\n\n.vcard p {\n\tmargin-left: 1em;\n}\n\n(there is the descendent selector again \u2013 it is the swiss army knife of CSS)\n\nNow, we\u2019ve not yet made the width of the hCard a function of the size of the text inside it (or \u201cem driven\u201d as we described it earlier). We do this by giving the hCard a width that is specified in em units. Here we\u2019ll set a width of say 28em, which makes the hCard always roughly as wide as 28 characters (strictly speaking 28 times the width of the letter capital M). \n\nSo the statement for our containing vcard element becomes\n\n.vcard {\n\tbackground-image: url(images/vcardfill.png);\n\tbackground-repeat: no-repeat;\n\tcolor: #666;\n\tfont-family: \"Lucida Grande\", Verdana, Helvetica, Arial, sans-serif;\n\twidth: 28em;\n}\n\nand now our element will look like this\n\n\n\nWe\u2019ve used almost entirely the existing HTML from our original hCard (adding just a little, and trying as much as possible to keep that additional markup meaningful), and just 6 CSS statements.\n\nHoliday Bonus \u2013 a downloadable vCard\n\nDid you notice this part of the HTML\n\n\n\n\t\u00a006\u00a0\n\t\u00a0africa\u00a0\n\t\u00a0amsterdam\u00a0\n\t...\n
\n\nAgain we have a simple collection of anchors like del.icio.us, only this time in a paragraph. But rather than using a class to represent the size of the tag they use an inline style. An inline style using a pixel-based font size. That\u2019s so far away from the goal of separating style from content, they might as well use a tag. You could theoretically parse that to extract the information, but you have more work to guess what the pixel sizes represent. Markup crime number two (and extra jail time for using non-breaking spaces purely for visual spacing purposes.)\n\nTechnorati \n\nAh, now. Here, you\u2019d expect something decent. After all, the Overlord of microformats and King of Semantics Tantek \u00c7elik works there. Surely we\u2019ll see something decent here? \n\n