On 1 July 2010 15:02, Bob McConnell <rvm@xxxxxxxxx> wrote: > From: Peter Lind > >> On 1 July 2010 14:38, Bob McConnell <rvm@xxxxxxxxx> wrote: >>> From: Adam Richardson >>> >>>> On Wed, Jun 30, 2010 at 9:16 PM, David Mehler > <dave.mehler@xxxxxxxxx> >>> wrote: >>>> >>>>> Hello, >>>>> I've got a php form processing question. I've got a text field like >>> so: >>>>> >>>>> <div> >>>>> <label for="txtname">Name*:</label> >>>>> <input type="text" name="name" id="name" size="30" value="<?php > echo >>>>> htmlspecialchars($_POST['name']), ENT_QUOTES, UTF-8; ?>" /> <br /> >>>>> </div> >>>>> >>>>> My question is what is the purpose of the id field? I know the name >>>>> field is what php references, but am not sure what id is for? >>>> >>>> Sometimes it's helpful to target a specific element for stylistic or >>>> functional purposes, and that's when you'll find an id attribute >>> helpful. >>>> >>>> In your example above, label elements use the id in the 'for' >>> attribute >>>> (and, speaking to your example, you should have for="name" instead > of >>>> for="txtname"): >>>> http://www.w3schools.com/tags/tag_label.asp >>>> >>>> In terms of CSS, you can specifically reference the element by it's > id >>> using >>>> the notation tag_name#id_value, and id's have the highest order of >>>> specificity (i.e., if you try and style an element by tag name, > class, >>>> and/or id, the id styles are what will take precedent, all other >>> things >>>> equal.) >>>> http://webdesign.about.com/od/cssselectors/qt/cssselid.htm >>>> http://www.stuffandnonsense.co.uk/archives/css_specificity_wars.html >>>> >>>> In terms of javascript, you can reference the element by it's id by >>> using >>>> the function getElementById('id_value): >>>> http://www.tizag.com/javascriptT/javascript-getelementbyid.php >>>> >>>> Just remember that a particular id can only occur once on a page >>> (another >>>> difference between the name attributes in a form, as you could have >>> multiple >>>> forms on a page and each form could have an input with a "zip" name >>> without >>>> issue, but that same page could only have one id with the value >>> "zip".) >>>> >>>> That all said, with the advent of javascript data attributes, you'll >>> have >>>> one more way to target elements for design and functionality: >>>> http://ejohn.org/blog/html-5-data-attributes/ >>> >>> If you look at the current HTML 4.01 and XHTML 1.0 specification, you >>> will find 'name' is no longer listed as a standard attribute. It is > all >>> but obsolete and has been replaced by 'id' almost everywhere. They >>> actually recommend you put both attributes into tags with identical >>> values until your applications can be updated to drop all uses of the >>> name attribute. >>> >>> <http://www.w3schools.com/tags/default.asp> >>> >> >> Errr, what? Name is by no means obsolete for forms. Have a look at >> > http://dev.w3.org/html5/spec/association-of-controls-and-forms.html#attr > -fe-name >> - it's still in the html5 spec and there's little to no chance of it >> going away any time soon. > > HTML5 is years away from completion and still changes far too often, so > we don't consider it nearly ready for prime time. XHTML is here now, has > several usable validation suites and has been stable for years. That's > more of a reasonable target for commercial products. > >> Relying on w3schools is not ... really advisable. > > Where else would you go? Even W3C doesn't publish decent reference > documents, and their specifications are inscrutable to normal human > beings. > > Bob McConnell > -- <hype> WWW: http://plphp.dk / http://plind.dk LinkedIn: http://www.linkedin.com/in/plind BeWelcome/Couchsurfing: Fake51 Twitter: http://twitter.com/kafe15 </hype> -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
