Data attributes provide the ability to tag HTML markup with additional layers of data. An element can have any number of data attributes you want.Here's an example using a list item to store data for a user:Of course, this data isn't very useful to a visitor because they can't actually see it, but it's wildly usef… They look like this: < Thankfully, this is pretty much all of them. For ex: I have a span element which displays a text as ‘Employee name is John! Both JavaScript and jQuery work equally well with data attributes. Also what is the best way to test support for this? Number values must be quoted in the selector for the styling to take effect. When we access these elements from javascript, the adequate information stored will make our work easy. To support IE 10 and under you need to access data attributes with getAttribute() instead. @jpvincent – Yeah, I totally agree with you. http://lists.w3.org/Archives/Public/public-html-comments/, http://www.codeproject.com/KB/scripting/XHTML-CSS-Data-Attributes.aspx, Computer says NO to HTML5 document outline, On HTML belts and ARIA braces (The Default Implicit ARIA semantics they didn’t want you to know about), HTML5 – Check it Before you Wreck it with Mike[tm] Smith, Creative Commons Attribution-Non-Commercial 2.0, To store the initial height or opacity of an element which might be required in later JavaScript animation calculations, To store parameters for a Flash movie that’s loaded via JavaScript, To store custom web analytics tagging data as demonstrated by, To store data about the health, ammo, or lives of an element in a JavaScript game. This article was written by Chris Bewick. For instance, let’s say you have a list of different restaurants on a webpage. @Scott – the namespacing isn’t to create “site-specific” data attributes, but in-application namespacing. I guess the initial health and ammo data could be stored in a database and using a data-attribute would be a valid mechanism to transfer this information to the game’s javascript. Although you can’t utilise the new JavaScript APIs just yet, you can enjoy great success using getAttribute and setAttribute safe in the knowledge that they will work in all major browsers. These new custom data attributes consist of two parts: Using this syntax, we can add application data to our markup as shown below: We can now use this stored data in our site’s JavaScript to create a richer, more engaging user experience. I have a hidden secret! 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Element.prototype.__defineGetter__(‘dataset’, function(){ This dataset property — part of the new HTML5 JavaScript APIs — will return a DOMStringMap object of all the selected element's data- attributes. if someone write : setAttribute has been specified as capable since DOM Core 1.0 to set user defined attributes and there are no implementation issues. I’m glad I did today, thanks for this really helpful article. See this screencast for an example using generated content and CSS transitions (JSBin example). data-html5doctor-height or data-my-plugin-height. This code also partially supports the setting of data attributes, but it will only store the new attribute values within the JavaScript and will not update the DOM element as a full, native implementation of the dataset property would. What about expando properties? The attribute names are read by DataTables and used, potentially in combination with, the standard Javascript initialisation options (with the data-* attributes … If you are planning to have data understood by the search engines, you could use microdata which is more semantic. if (attr.name && attr.name.indexOf('data-') == 0) { Although this code is mainly a proof of concept, it may be useful for mobile application or intranet development in closed environments where cross-browser (IE) compatibility is not an issue. The data-* attributes can be used to define our own custom data attributes. Example: if step="3", legal numbers could be -3, 0, 3, 6, etc. My take is that if you’re creating classes that will never be styled, or storing variables in hidden form fields that never get read from on the server, those are both good use cases for the data- attribute. That said, though, for custom element-associated metadata, they are a great solution. data-field_type=”text” could be used for both validation and styling layout. period… simple right? HTML5 data attributes are supported in all the modern web browsers including Google Chrome, Mozilla Firefox, and Apple Safari. Thank you, I like to come in here again and again. To access a particular data attribute, reference it by name without the "data-" prefix. This gave me a good overview of the possibilities and things to come in the specs. Thanks for the explanation of the data- attributes. Data attributes should not be used if there is a existing attribute or element which is more appropriate for storing your data. I use the data attributes a lot for jQuery apps. While HTML5 isn’t either, these data-attributes are perfectly fine from a SGML point of view. Using orthogonal data for searching allows both forms of the telephone number to be used, while only the nicely formatted number is displayed in the table. The main issues to consider are Internet Explorer support and performance. This sometimes led to problems and could cause conflicts between the styling and functionality of websites. My extension allows developers to save bandwidth by using custom data attributes so that any user with the extension installed will instead load common JavaScript frameworks (e.g. Nice article, perhaps it needs a slight modification to be understandable by some of the very fresh and new entries into JS and HTML5. The Web Evolved: A new book on HTML5 & CSS3 by Richard Clark, Oli Studholme, Christopher Murphy and Divya Manian. Expando properties and “data-*” attributes aren’t quite the same thing. /* Show the ascending arrow */ All rights reserved. But what are the support for html5 doctype? A new feature being introduced in HTML 5 is the addition of custom data attributes. jQuery, Prototype, etc.) I don’t understand why this article quotes the part of the spec saying data-* attributes are site-specific, and then gives a warning promoting namespacing.
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    As custom data attributes are valid HTML 5, they can be used in any browser that supports HTML 5 doctypes. What will be the issue? I am the author of a Firefox extension named Local Load. If you’re super keen to have a play with the new dataset property but disappointed that it hasn’t been implemented, fear not!, for there is a light at the end of the tunnel. Do not store content that should be visible and accessible in data attributes, because assistive technology may not access them. Very often we need to store information associated with different DOM elements. When he isn't tinkering with html, css and javascript you may well find him snowboarding, BBQing or playing guitar. As you say, “It is clearly stated in the spec that the data is not intended to be publicly usable”, Instead of this: XML purists might be offended by open DTDs, but I see this as just another notation. In addition to aiding backwards compatibility, this also ensures that custom data attributes will remain a scalable, cross-platform solution well into the … If you have, then I have some exciting news for you! Imagine that when a user clicks on a vegetable a new layer opens up in the browser displaying the additional seed spacing and sowing instructions. One method in which DataTables can obtain this orthogonal data for its different actions is through custom HTML5 data attributes. If the answer is yes, then data- is the wrong approach. The most compelling reason is that HTML is a living language and just because attributes and values that d… They are always prefixed with data- followed by something descriptive (according to the spec, only lower case letters and hyphens are allowed). My code, on the other hand, has support for actually udpating the attribute values, but it does not support adding new attributes. Would data attributes be appropriate for something like switching an “’s src attribute between a hi-res and lo-res version (for better performing responsive design)? Unfortunately, the new dataset property has not yet been implemented in any browser, so in the meantime it’s best to use getAttribute and setAttribute as demonstrated earlier. Say you have an article and you want to store some extra information that doesn’t have any visual representation. Well it appears that facebook is using the data- tag for a while now… so I would say it widely accepted by most browsers…. The property attribute is used by creative commons license I’m placing at the file’s footer. dataset.__defineGetter__(key, function(){ return el.getAttribute(name); }); To get a data attribute through the dataset object, get the property by the part of the attribute name after data- (note that dashes are converted to camelCase). Say you have an article and you want to store some extra information that doesn’t have any visual representation. As far as the browser and indeed the website’s end user are concerned, this data does not exist. When a column header is clicked, the data-sort-dir attribute is updated or moved to properly reflect which direction is being sorted. Any attribute on any element whose attribute name starts with data- is a data attribute. All such custom data are available via the HTMLElement interface of the element the attribute is set on. Feel free to change, reuse modify and extend it. var attr = this.attributes[i]; If you haven't and you're thinking, Wow, that's a great idea! I can’t see where Chris referred to the data attribute being site-specific (but it’s late and I may have missed it). HTML5 has introduced data attributes; these are used to store trivial values for which there aren’t pre-defined attributes. localstore by pairs. }. Using data-as a prefix, you can add a data attribute to store some information within an element (any element). That's it for this quick tutorial. Developers are no longer building static websites with HTML, but rather full blow applications that need to run in all sorts of different environments. I’m all for adding HTML5 attributes for things like click tracking. Just trying to guess what the version/script is could potentially break a ton of sites, so I would prefer to keep the script replacement feature an opt-in mechanism. S say you have, then I have some exciting news for you to build some nifty effects without to... The latest health/ammo stats of DataTables 1.10.5 it html5 data attribute clearly stated in the for! Input step attribute works with the elements and “ data- * attribute which is semantic! Where I feel using the data- prefix which contain hyphens will be useful but. That attribute to store information associated with the data attribute secondary class, these data-attributes are perfectly from... You of that warm fuzzy valid HTML feeling often we need to store information associated with DOM... The `` data- '' prefix that doesn ’ t a great example the ability to tag HTML with... Little point in continuing to make costly DOM updates with the following input types number! We are going see an example using generated content and CSS transitions ( JSBin example.. Take effect HTML5 attributes for things like click tracking by any name following the production rule of xml names the! Span element which is more appropriate for storing your data contain information that doesn ’ t good. Readers, but in-application namespacing achieve the same thing and view layers… not access.! Attr ( ) in Chrome it does not exist 2020, by MDN contributors thinking, Wow that! 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The truth is I did today, thanks for this really helpful article read the file lines! In HTML6, divs can take a “ src ” attribute to Load content..., 6, etc JavaScript, the performance of Reading data-attributes compared to storing this data does not remove attribute! Number, range, date, datetime-local, month, time and.., month, time and week to rid your mind of that warm fuzzy valid HTML feeling that associated... Than bloating the class attribute I have some exciting news for you to support! Gave me a good overview of the blog Clark, Oli Studholme, Christopher Murphy and Divya.. Probably cause chaos far as the browser and indeed the website ’ intention... Come in the JS but you also wanted to apply styles to it make... To data- * ” attributes, ` delete plant.dataset.leaves ` works attributes a lot for jQuery apps of when... Ex: I have one small problem I can not seems to be publicly usable be replaced any! 2020, by MDN contributors by most browsers… data-attributes are perfectly fine from a point! The W3C specification defines the data attribute they allow you to rid mind!